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Laboratoire dĠƒtudes Spatiales

et dĠInstrumentation en Astrophysique (LESIA)

P™le PlanŽtologie / Planetary Sciences

Observatoire de Paris 92190 Meudon, France

e-mail: thomas.widemann@obspm.fr

office: Building 10, Room 21

phone: + 33 1 45 07 77 38

 

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Dynamiques Patrimoniales et Culturelles

47, bd Vauban 78047 Guyancourt, France

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office: Building Vauban, Room 309

phone: + 33 1 39 25 56 44

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    Dr Thomas Widemann


mots-clefs de l'activitŽ de recherche: planŽtologie, Histoire des sciences

Page personnelle/Home page Observatoire de Paris – LESIA UMR CNRS 8109

Page personnelle/Home page UniversitŽ de Versailles Saint-Quentin  - DYPAC EA 2449

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EuroVenus Project Coordinator

http://www.eurovenus.eu


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2012 : the Venus Twilight Experiment

Lightcurve Films - 5 April 2016

2013-2016 : EuroVenus episode 1

WhiteFox Pictures - 8 Oct. 2015

The Venus Emissivity, Radio Science,

InSAR, Topography, and Spectroscopy

mission (VERITAS)

The Venus Atmospheric

maneuverable platform (VAMP)


ACTIVITƒ DE RECHERCHE / RESEARCH ACTIVITY

 

A l'heure de la dŽcouverte et de l'effort pour la caractŽrisation de l'habitabilitŽ des exoplantes, et l'apparition des conditions de vie sur Terre, lĠŽtude des atmosphres du systme solaire constitue un thme de planŽtologie comparŽe : la recherche des paramtres et des processus physiques, chimiques, et dynamiques qui conduisent aux diffŽrences entre les atmosphres. Les conditions limites diffŽrentes (pression au sol, flux solaire, pŽriode de rotation, mŽcanismes saisonniers, r™le du volcanisme, des poussires) induisent une dynamique et une chimie quantitativement distinctes. C'est le cas de VŽnus, qui s'est formŽe ˆ la mme Žtape de formation du systme solaire que pour la Terre et Mars, ˆ partir des mmes ingrŽdients, et a presque atteint la taille de notre plante. Et pourtant, VŽnus est aujourd'hui une plante inhospitalire et incompatible avec la vie telle que nous la connaissons. Dans la plupart des cas les rŽsultats des sŽries de donnŽes climatiques sur VŽnus sont ensuite comparŽs aux prŽdictions des modles tridimensionnels couplŽs existant en particulier ˆ lĠIPSL.

 

Mon activitŽ de recherche et celle de lĠŽquipe scientifique (p™le planŽtologie du LESIA ; thse LESIA/Observatoire de Lisbonne P. Machado, 2014 ; thse LESIA/Observatoire de la C™te d'Azur C. Pre, en cours) s'intgrent dans ce cadre au travers de l'exploitation de donnŽes en provenance de diffŽrents moyens sol : observations astronomiques de la dynamique et de la chimie de l'atmosphre par photomŽtrie et spectromŽtrie dans les domaines visible, IR ˆ l'aide des instruments CFHT/ESPaDOnS, IRTF/TEXES, ALMA et spatiaux - mission Venus Express de l'ESA, lancŽe en 2006 (instruments VMC, SOIR, VIRTIS).J'ai coordonnŽ plusieurs programmes binationaux dans le cadre de partenariats EGIDE/Hubert-Curien (France-Japon SAKURA, 2010-2012 ; France-Portugal PESSOA, 2011-2013). De 2013 ˆ 2016, je suis le coordinateur d'un projet de la Commission eurupŽenne (budget : 2,18 MÛ) rŽparti sur 5 pays et 6 laboratoires, consacrŽ ˆ l'Žtude et l'exploitation de donnŽes de l'atmosphre de VŽnus. Ce projet ˆ trs haute visibilitŽ internationale, qui finance l'Žquivalent de 370 personnes-mois en Europe sur 3 ans, est coordonnŽ par lĠObservatoire de Paris. Il inclut lĠuniversitŽ dĠOxford, lĠuniversitŽ de Cologne, lĠuniversitŽ de Lisbonne, lĠinstitut dĠaŽronomie spatiale de Belgique, lĠObservatoire de la C™te dĠAzur. Un rapprochement est en cours avec l'UVSQ / laboratoire DYPAC EA 2449 sur la figure de VŽnus dans la diffusion des savoirs au sein de l'Europe savante des XVIe-XVIIIe sicles.

 

Je participe Žgalement ˆ l'Žlaboration de plusieurs projets spatiaux comme responsable scientifique dans la cadre de plusieurs rŽponses ˆ des appels d'offres internationaux d'exploration de la plante VŽnus : (1) la mission spatiale M4 / EnVision proposŽe en rŽponse ˆ l'appel d'offres M4 de l'Agence spatiale europŽenne (core-team member), (2), le concept d'avion spatial VAMP pour VŽnus (Science Definition Team member), (3) le projet de spectropolarimtre proche-infrarouge SPIRou au tŽlescope CFHT.  En hŽritage de la mission Venus Express, parvenue ˆ la fin de ses huit annŽes dĠopŽrations en dŽcembre 2014, nous nous intŽressons ˆ la cartographie de lĠŽmissivitŽ IR de la surface de VŽnus telle quĠelle a pu tre observŽe dans les fentres proche IR c™tŽ nuit par lĠinstrument VIRTIS (1.01-1.18 mm). Nous proposons avec le DLR Berlin lĠinstrument Venus Emissivity Mapper (VEM) qui, en cas de sŽlection, complŽtera la cartographie de surface par interfŽromŽtrie et altimŽtrie radar de futures missions par des mesures simultanŽes des propriŽtŽs dĠŽmissivitŽ et dĠaltŽration des roches en surface.

 

STELLAR OCCULTATIONS BY DISTANT ICY BODIES OF THE SOLAR SYSTEM:co2.jpg

DYNAMICAL PROPERTIES AND VARIABILITY OF VENUSĠ ATMOSPHERE:Image 8.jpg

EARLY MODERN ASTRONOMY

 

:Image3.jpg

Upper Limits for a TitaniaĠs Atmosphere and for a Large Trans-Neptunian ObjectĠs Atmosphere from Stellar Occultations (Widemann et al. 2009, Icarus 199, 458)

 

 

Dynamical structure of Venus' Middle Atmosphere constrained by Direct Wind Measurements in the Visible

(Widemann et al. 2008, PSS 56, 1320 ; Widemann et al. 2007, PSS 55, 1741).

 

The Prince and the Scientist in Modern European Courts, XVIIth – XVIIIth Centuries

Centre de recherche du ch‰teau de Versailles, Observatoire de Paris 2007-2010

"Sciences et CuriositŽs ˆ la Cour de Versailles", 26 Oct. 2010-27 Feb. 2011

First science workshop Dec. 9 2008

Avant-propos / foreword


ACTIVITƒ DĠENSEIGNEMENT / TEACHING ACTIVITY

 

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OBSERVATOIRE DE

PARIS-MEUDON


Master Sciences de l'univers et techniques spatiales

M1 : SDU-6 Histoire de l'astronomie

M1 : SDTP-1 PlanŽtologie comparŽe

Stage Histoire de l'astronomie

JDA DŽcouvrir l'AntiquitŽ – ENS / PSL


 

PrŽsentations du cours SDU-6

 

 


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IECI - Licence de Lettres

LHLET525 Discours savants aux carrefours des cultures

LHLET606 MusŽologie et mŽdiation des savoirs

LHHIS109 Arts, cultures, patrimoines


 

PrŽsentations du cours LHLET525

PrŽsentations du cours LHLET606

PrŽsentation du cours LHHIS109

 

UNIVERSITƒ DE VERSAILLES-SAINT-QUENTIN-EN-YVELINES

IECI - Master Histoire culturelle et sociale

M1 : MYHIS133 – Recherche en histoire culturelle

et sociale de l'ƒpoque moderne

 

PrŽsentation du sŽminaire

Programme 2015-2016

 


M2 planŽtologie et exploration spatiale

M2 : Introduction : Le systme solaire et les plantes


UFR Sciences

Licence MathŽmatiques-Physique, Physique

LSEN690 Astrophysique S6

PrŽsentations du cours LSEN690

 

LSCG274 Histoire de la Physique

PrŽsentations du cours LSCG274

  

 


ORGANISATION DE COLLOQUES, CONFƒRENCES, JOURNƒES DĠƒTUDE /

WORKSHOPS, CONFERENCES, COLLOQUIA ORGANISATION

 

5-7 March 2012

Venus as a transiting exoplanet : Strategic workshop on coordinated ground-based measurements

and modeling of the Venus atmosphere - Institut d'Astrophysique de Paris (France)

28-29 June 2010

 

9 Dec. 2009

 

1st Europlanet strategic meeting on cooordinated ground-based measurements and modeling of the Venus atmosphere Paris Observatory – website

JournŽe d'Žtude du projet Sciences et pouvoir : le prince et le savant dans les cours europŽennes aux XVIIe et XVIIIe sicle organisŽe par le Centre de recherche du ch‰teau de Versailles et l'Observatoire de Paris

 


ACTIVITƒS DE DIFFUSION DES CONNAISSANCES / DISSEMINATION ACTIVITIES

 

2014             EuroNews/Space : Ë la rencontre de notre voisine VŽnus – FR – Close encounters with Venus - EN 

2014             Une premire astronautique : l'aŽrofreinage de la mission VŽnus Express – Le Monde

2014             JournŽes DŽcouvrir l'AntiquitŽ ˆ l'Observatoire de Paris, Mar. 25, 2014

2013             Dec. Le projet EuroVenus, Radio-France-Internationale, Chronique de l'Espace, Dec. 7, 2013

2012             Our last transit of Venus from Lightcurve Films on Vimeo – June 2012

2012             The University Centre in Svalbard (UNIS), Norway : "History of Venus transits"

2012             Science News@Analysis, Vol. 336, 11 May 2012 : Venus's Rare Sun Crossing May Aid Search for Exoplanets

 


OUVRAGES COLLECTIFS / BOOKS

 

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Venus II, S.W. Bougher, D.M. Hunten, & R.J. Phillips Eds., University of Arizona Press, Tucson, 1997

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Ç Le passage de VŽnus È

Direction : Jean-Eudes Arlot

EDP-Sciences

Mars 2004

 

 

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Ç Matire et matŽriaux,

De quoi est fait le monde ? È

Direction : Etienne Guyon

Mars 2010

Prix Roberval 2011

ƒditions Belin-Pour la Science

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Sciences et CuriositŽs ˆ la Cour de Versailles. RŽunion des MusŽes Nationaux, Catalogue de l'exposition, ISBN-10: 2711856836, Nov. 2010


PUBLICATIONS

 

2011-2016

Publications internationales avec comitŽ de lecture

Peer-reviewed research articles

 

[A37] Encrenaz, T., Greathouse, T.K., Richter, M.J., DeWitt, C., Widemann, T., BŽzard, B., Fouchet, T., Atreya, S.K., and Sagawa, H. 2016, HDO and SO2 thermal mapping on Venus. III. Short-term and Long-term variations between 2012 and 2016, Astron.Astrophys., submitted.

[A36] Pere, C., P. Tanga, T. Widemann,  Ph. Bendjoya, A. Mahieux, V. Wilquet, and A.C. Vandaele 2016,  A multi-layer approach to modeling the Venus transit aureole photometry: comparison between HMI/SDO and VEx/SOIR data, Astronomy and Astrophysics, submitted.

[A35] Tinetti, A., Drossart, P., Eccleston, P, Hartogh, P., (É), Widemann, T., (É) [240 authors] 2015, The EchO science case, Experimental Astronomy, Dec. 2015, Vol. 40, Issue 2, pp. 329-391.

[A34] Dias-Oliveira, A., Sicardy, B., Lellouch, E., Vieira-Martins, R., Assafin, M., Camargo, J.I.B., Braga-Ribas, F., Gomes-Junior, A. R., Benedetti-Rossi, G., Colas, F., Decock, A., Doressoundiram, A., Dumas, C., Emilio, M., Fabrega Polleri, J., Gil-Hutton, R., Gillon, M., Girard, J., Hau, G., Ivanov, V. D., Jehin, E., Lecacheux, J., Leiva, R., Lopez-Sisterna, C., Mancini, L., Maury, A., Meza, E., Morales, N., Nagy, L., Opitom, C., Ortiz, J. L., Pollock, J., Roques, F., Snodgrass, C., Soulier, J.F., Thirouin, A., Vanzi, L., Widemann, T., Reichart, D. E., LaCluyze, A. P., Haislip, J. B., Ivarsen, K. M., Dominik, M., Jżrgensen, U., Skottfelt, J. 2015,  Pluto's atmosphere from Stellar Occultations in 2012 and 2013, Astrophys. J., 811:53.

[A33] Luz, D.,  Read, P., Widemann, T., Piccioni, G., Drossart, P., 2015, A first quantitative comparison between the Venus polar vortex and terrestrial hurricanes, submitted.

[A32] Limaye, S.S., Bougher, S., Chamberlain, S., Clancy, R.T., Gilli, G., Grassi, D., Haus, R., Herrmann, M., Imamura, T., Kohler, E., Krause, P., Lebonnois, S., Mahieux, A., Migliorini, A., Montmessin, F., Paetzold, M., Piccialli, A., Rengel, M., Rodin, A., Sandor, B., Sornig, M., Svedhem, H., Tellmann, S., Vandaele, A.C., Widemann, T., Wilson, C., MŸller-Wodarg, I., Zasova, L. 2015, Venus Atmospheric Structure : Intercomparison of recent observations of thermal structure and density as a step towards updating the Venus International Reference Atmosphere, Icarus, submitted.

[A31] Reale, F., Gambino, A.F., Micela, G., Maggio, A., Widemann, T., and Piccioni, G. 2015,  The transit of Venus : probing the upper planetary atmosphere, Nature Communications, DOI :10.1038/ncomms8563.

[A30] Marcq, E., Lellouch, E., Encrenaz, T., Widemann, T., Birlan, M., and Bertaux, J.L. 2015, Search for horizontal and vertical variations of CO in the day and night sides of lower mesosphere of Venus from CSHELL/IRTF 4.53 µm observations. Plan. Space Sci., doi:10.1016/j.pss.2014.12.013

[A29] Machado, P., Widemann, T., Luz, D. and Peralta, J. 2014, Wind circulation regimes at VenusĠ cloud tops : Ground-based Doppler velocimetry using CFHT/ESPaDOnS and comparison with simultaneous cloud tracking measurements using VEx/VIRTIS in February 2011, Icarus 243, 249-263.

[A28] Braga-Ribas, F.., B. Sicardy, J. L. Ortiz, C. Snodgrass, F. Roques, R. Vieira-Martins, J. I. B. Camargo, M. Assafin, R. Duffard, E. Jehin, J. Pollock, R. Leiva, M. Emilio, D. I. Machado, C. Colazo, E. Lellouch, J. Skottfelt, M. Gillon, N. Ligier, L. Maquet, G. Benedetti-Rossi, A. Ramos Gomes Jr, P. Kervella, H. Monteiro, R. Sfair, M. El Moutamid, G. Tancredi, J. Spagnotto, A. Maury, N. Morales, R. Gil-Hutton, S. Roland, A. Ceretta, S-h. Gu, X-b. Wang, K. Harpsże, M. Rabus, J. Manfroid, C. Opitom, L. Vanzi, L. Mehret, L. Lorenzini, E. M. Schneiter, R. Melia, J. Lecacheux, F. Colas, F. Vachier, T. Widemann, L. Almenares, R. G. Sandness, F. Char, V. Perez, P. Lemos, N. Martinez, U. G. Jżrgensen, M. Dominik, F. Roig, D. E. Reichart, A. P. LaCluyze, J. B. Haislip, K. M. Ivarsen, J. P. Moore, N. R. Frank & D. G. Lambas 2014, A ring system detected around the Centaur (10199) Chariklo, Nature, Vol. 508, Issue 7494, pp. 72-75. doi:10.1038/nature13155.

[A27] Boissel, Y.,  B. Sicardy,  F. Roques, P. Gaulme, A. Doressoundiram, T. Widemann, V.D. Ivanov, O. Marco, E. Mason, N. Ageorges, O. Mousis, P. Rousselot, V. S. Dhillon, S. P. Littlefair, T. R. Marsh, M. Assafin, F. Braga Ribas, D. da Silva Neto, J.I.B. Camargo, A. Andrei, R. Vieira Martins, R. Behrend, and M. Kretlow 2014, An exploration of PlutoĠs environment through stellar occultations, Astr. Astrophys., 561, A144.

[A26] O. Mousis, R. Hueso, J.-P. Beaulieu, S. Bouley, B. Carry, F. Colas, A. Klotz, C. Pellier, J.-M. Petit, P. Rousselot, M. Ali Dib, W. Beisker, M. Birlan, C. Buil, A. Delsanti, E. Frappa, H. B. Hammel, A.-C. Levasseur-Regourd, G. S. Orton, A. Sanchez-Lavega, A. Santerne, P. Tanga, J. Vaubaillon, B. Zanda, D. Baratoux, T. Bohm, V. Boudon, A. Bouquet, L. Buzzi, J.-L. Dauvergne, A. Decock, M. Delcroix, P. Drossart, N. Esseiva, G. Fischer, L. N. Fletcher, S. Foglia, J. M. Gomez-Forrellad, J. Guarro-Flo, D. Herald, F. Kugel, J.-P. Lebreton, J. Lecacheux, A. Leroy, L. Maquet, G. Masi, A. Maury, F. Meyer, S. Perez-Hoyos, A. S. Rajpurohit, C. Rinner, J. H. Rogers, F. Roques, R. W. Schmude, Jr., B. Sicardy, B. Tregon, M. Vanhuysse, A. Wesley, and T. Widemann 2014, Instrumental Methods for Professional and Amateur Collaborations in Planetary Astronomy, Experimental Astronomy, DOI 10.1007/s10686-014-9379-0.

[A25] Encrenaz, T., Greathouse, T.K., Richter, M.J., Lacy, J., Widemann, T., BŽzard, B., Fouchet, T., deWitt, C. and Atreya, S.K. 2013, HDO and SO2 thermal mapping on Venus. II. The SO2 spatial distribution above and within the clouds, Astron.Astrophys., Volume 559, id.A65, 9p.

[A24] Braga-Ribas, F., B. Sicardy, J. L. Ortiz, E. Lellouch, G. Tancredi, J. Lecacheux, R. Vieira-Martins, J. I. B. Camargo, M. Assafin, R. Behrend, F. Vachier, F. Colas, N. Morales, A. Maury, M. Emilio, A. Amorim, E. Unda-Sanzana, S. Roland, S. Bruzzone, L. A. Almeida, C. V. Rodrigues, C. Jacques, R. Gil-Hutton, L. Vanzi, A. C. Milone, W. Schoenell, R. Salvo, L. Almenares, E. Jehin, J. Manfroid, S. Sposetti, P. Tanga, A. Klotz, E. Frappa, P. Cacella, J. P. Colque, C. Neves, E. M. Alvarez, M. Gillon, E. Pimentel, B. Giacchini, F. Roques, T. Widemann, V. S. Magalh‹es, A. Thirouin, R. Duffard, R. Leiva, I. Toledo, J. Capeche, W. Beisker, J. Pollock, C. E. Cede–o Monta–a, K. Ivarsen, D. Reichart, J. Haislip, and A. Lacluyze 2013, The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from multi-chord Stellar Occultations, Astrophys. J. 773, 1, p. 26 - doi:10.1088/0004-637X/773/1/26.

 [A23] Ortiz, J.L., Sicardy, B., Braga-Ribas, F., Alvarez-Candal, A., Lellouch, E., Duffard, R., Pinilla-Alonso, N., Ivanov V.D., Littlefair, S.P., Camargo, J.I.B., Assafin M., Unda-Sanzana, E., Jehin, E., Morales, N., Tancredi, G., Gil-Hutton, R., de la Cueva, I., Colque, J.P., Da Silva Neto, D.N., Manfroid, J., Thirouin, A., GutiŽrrez, P.J., Lecacheux, J., Gillon, M., Maury, A., Colas, F., Licandro, J., Mueller, T., Jacques, C., Weaver, D., Milone, A., Salvo, R., Bruzzone, S., Organero, F., Behrend, R., Roland, S., Vieira-Martins, R., Widemann, T., Roques, F., Santos-Sanz, P., Hestroffer, D., Dhillon, V.S., Marsch, T.R., Harlingten, C., Campo Bagatin, A., Alonso, M.L., Ortiz, M., Colazo, C., Lima, H., Oliveira, A., Kerber, L.O., Smiljanic, R., Pimentel, E., Giacchini, B., Cacella, P., Emilio, M. 2012, Albedo and atmospheric constraints of dwarf planet Makemake from a stellar occultation, Nature, Volume 491, Issue 7425, pp. 566-569 (2012)

[A22] Encrenaz, T., Greathouse, T. K., Roe, H., Richter, M., Lacy, J., BŽzard, B., Fouchet, T., Widemann, T. 2012, HDO and SO2 thermal mapping on Venus: Evidence for strong SO2 variability, Astr. Astrophys. 543, A153.

[A21] Machado, P., Luz, D., Widemann, T, Lellouch, E., Witasse, O. 2012, Mapping zonal winds at Venus' cloud tops from ground-based Doppler velocimetry, Icarus 221, 248-261.

[A20] Tanga, P., Widemann, T., Sicardy, B., Pasachoff, J., Arnaud, J., Comolli, L., Rondi, A., Rondi, S., Suetterlin, P. 2011, Sunlight refraction in the mesosphere of Venus during the transit on June 8th, 2004 (2012), Icarus 218, 207-219, arXiv:1112.3136.

[A19] Tinetti G., Beaulieu J.P., Henning T., Meyer M., Micela G., Ribas I., Stam D., Swain M., Krause O., Ollivier M., Pace E., Swinyard B., Aylward A., van Boekel R., Coradini A., Encrenaz T., Snellen I., Bouwman J., Cho J. Y-K., CoudŽ du Foresto V., Guillot T., Mueller-Wodarg I., Palle E., Selsis F., Sozzetti A., Ade P.A.R., Achilleos N., Adriani A., Agnor C. B., Afonso C., Allende Prieto C., Bakos G., Barber R. J., Barlow M., Bernath P., BŽzard B., BordŽ P., Brown L.R., Cassan A., Cavarroc C., Ciaravella A., Cockell, C., Coustenis A., Danielski C., Decin L., De Kok R., Demangeon O., Deroo P., Doel P., Drossart P., Fletcher L.N., Focardi M., Forget F., Fossey S., FouquŽ P., Frith J., Galand M., Gaulme P., Gonz‡lez Hern‡ndez J.I. (IAC), Grasset O., Grassi D., Grenfell J. L., Griffin M. J., Griffith C. A., Gršzinger U., Guedel M., Guio P., Hainaut O., Hargreaves R., Hauschildt P. H., Heng K., Heyrovsky D., Hueso R., Irwin P., Kaltenegger L., Kervella P., Kipping D., Koskinen T.T., Kov‡cs G., La Barbera A., Lammer H., Lellouch E., Leto G., Lopez Morales M., Lopez Valverde M.A., Lopez-Puertas M., Lovis C., Maggio A., Maillard J.P., Maldonado Prado J., Marquette J.B., Martin-Torres F.J., Maxted P., Miller S., Molinari S., Montes D., Moro-Martin A., Moses J.I., Mousis O., Nguyen Tuong N., Nelson R., Orton G.S., Pantin E., Pascale E., Pezzuto S., Pinfield D., Poretti E., Prinja R., Prisinzano L., Rees J.M., Reiners A., Samuel B., S‡nchez-Lavega A., Sanz Forcada J., Sasselov D., Savini G., Sicardy B., Smith A., Stixrude L., Strazzulla G., Tennyson J., Tessenyi M., Vasisht G., Vinatier S., Viti S., Waldmann I., White G.J., Widemann T., Wordsworth R., Yelle R., Yung Y., Yurchenko S.N. 2012, EChO, Exoplanet characterisation observatory, Experimental Astronomy, DOI 10.1007/s10686-012-9303-4, Aug. 2012.

[A18] Ehrenreich, D., Vidal-Madjar, A., Widemann, T., Gronoff, G., Tanga, P., BarthŽlemy, M., Lilensten, J., Lecavelier des Etangs, A. and Arnold, L. 2011,Transmission spectrum of Venus as a transiting exoplanet, Astronomy & Astrophysics 527, L2, DOI: 10.1051/0004-6361/201118400, arXiv:1112.0572.

[A17] Sicardy, B., J. L. Ortiz, M. Assafin, E. Jehin, A. Maury, E. Lellouch, R. Gil Hutton, F. Braga-Ribas, F. Colas, D. Hestroffer, J. Lecacheux, F. Roques, P. Santos Sanz, T. Widemann, N. Morales, R. Duffard et al. 2011, A radius of 1163 km and an albedo of 0.96 for Eris from a stellar occultation, 2011, Nature, Vol. 478, p. 493-496, 27 October 2011.

[A16] G. Tinetti, J.Y.K. Cho, C.A. Griffith, O. Grasset, L. Grenfell, T. Guillot, T.T. Koskinen, J.I. Moses, D. Pinfield, J. Tennyson, M. Tessenyi, R. Wordsworth, A. Aylward, R. van Boekel, A. Coradini, T. Encrenaz, I. Snellen, M.R. Zapatero-Osorio, J. Bouwman, V.C. du Foresto, M. Lopez-Morales, I. Mueller-Wodarg, E. Pall ́e, F. Selsis, A. Sozzetti, J.P. Beaulieu, T. Hen- ning, M. Meyer, G. Micela, I. Ribas, D. Stam, M. Swain, O. Krause, M. Ollivier, E. Pace, B. Swinyard, P.A.R. Ade, N. Achilleos, A. Adriani, C.B. Agnor, C. Afonso, C.A. Prieto, G. Bakos, R.J. Barber, M. Barlow, P. Bernath, B. BŽzard, P. BordŽ, L.R. Brown, A. Cassan, C. Cavarroc, A. Ciaravella, C. Cockell, A. Coustenis, C. Danielski, L. Decin, R. De Kok, O. Demangeon, P. Deroo, P. Doel, P. Drossart, L.N. Fletcher, M. Focardi, F. Forget, S. Fossey, P. FouquŽ, J. Frith, M. Galand, P. Gaulme, J.I.G. Herna ́ndez, D. Grassi, M.J. Griffin, U. Gršzinger, M. Guedel, P. Guio, O. Hainaut, R. Hargreaves, P.H. Hauschildt, K. Heng, D. Heyrovsky, R. Hueso, P. Ir- win, L. Kaltenegger, P. Kervella, D. Kipping, G. Kovacs, A.L. Barbera, H. Lammer, E. Lellouch, G. Leto, M.L. Morales, M.A.L. Valverde, M. Lopez-Puertas, C. Lovi, A. Maggio, J.P. Maillard, J.M. Prado, J.B. Marquette, F.J. Martin-Torres, P. Maxted, S. Miller, S. Molinari, D. Montes, A. Moro-Martin, O. Mousis, N.N. Tuong, R. Nelson, G.S. Orton, E. Pantin, E. Pascale, S. Pezzuto, E. Poretti, R. Prinja, L. Prisinzano, J.M. Reess, A. Reiners, B. Samuel, J.S. Forcada, D. Sasselov, G. Savini, B. Sicardy, A. Smith, L. Stixrude, G. Strazzulla, G. Vasisht, S. Vinatier, S. Viti, I. Waldmann, G.J. White, T. Widemann, R. Yelle, Y. Yung, S. Yurchenko, in IAU Symposium, IAU Symposium, vol. 276, ed. by A. Sozzetti, M. G. Lattanzi, & A. P. Boss (2011), IAU Symposium, vol. 276, pp. 359–370. DOI 10.1017/S1743921311020448

[A15] Pasachoff, J.M., G. Schneider, and T. Widemann 2011, High-Resolution Satellite Imaging of the 2004 Transit of Venus and Asymmetries In the Cytherean Atmosphere, Astronomical Journal, 141, 112.

[A14] Sicardy, B., Bolt, G., Frappa, E., Lecacheux, J., Peyrot, A., Teng-Chuen-Yu, J.-P., Beisker, W., Boissel, Y., Buckley, D., Colas, F., de Witt, C., Doressoundiram, A., Roques, F., Widemann, T., Gruhn, C., Batista, V., Biggs, J., Dieters, S., Greenhill, J., Groom, R., Herald, D., Lade, B., Mathers, S., Assafin, M., Camargo, J.I.B., Vieira Martins, R., Andrei, A. H., da Silva Neto, D.N., Brago-Ribas, F., Behrend, R. 2010, Constraints on Charon's orbital elements from the double stellar occultation of 2008 June 22, The Astronomical Journal, Volume 141, Issue 2, article id. 67 (2011). DOI:10.1088/0004-6256/141/2/67.

 

Avant/Before 2011

[A13] Roques, F., Boissel, Y., Doressoundiram, A., Sicardy, B., and Widemann, T. 2009, Exploration of the Outer Solar System by Stellar Occultations, Earth, Moon, and Planets, 105, 201-208. Download pdf

[A12] Widemann, T., B. Sicardy, R. Dusser, C. Martinez, W. Beisker, E. Bredner, D. Dunham, P. Maley, E. Lellouch, J.-E. Arlot, J. Berthier, F. Colas, W.B. Hubbard, R. Hill, J. Lecacheux, J.-F. Lecampion, S. Pau, M. Rapaport, F. Roques, W. Thuillot, et al. 2009, Titania's Radius and an Upper Limit on its Atmosphere from the September 8, 2001 Stellar Occultation, Icarus 199, Vol. 2, pp. 458-476. Download pdf

[A11] Widemann, T., Lellouch, E., Donati, J.-F., 2008, Venus Doppler winds at Cloud Tops Observed with ESPaDOnS at CFHT, Planetary and Space Science, Special issue on Ground-based measurements in support of Venus Express, 56, 1320-1334. Download pdf

[A10] Gaulme, P., Schmieder, F.-X., Grec, C., Ariste, A. L., Widemann, T., and Gelly, B. 2008, Venus wind map at cloud top level with the MTR/Themis visible spectrometer, I – Instrumental performance and first results, Planetary and Space Science, Special issue on Ground-based measurements in support of Venus Express, 56, 1335-1343. Download pdf

[A9] Widemann, T., Lellouch, E., and Campargue, A. 2007, New Wind Measurements in VenusĠ Lower Mesosphere From Visible Spectroscopy, Planetary and Space Science, Special Venus issue Vol. 2, 55, 1741-1756. Download pdf

[A8] Sicardy, B., Colas, F., Widemann, T., Beisker, W., Kretlow, M., Ferri, F., Lacour, S., Lecacheux, J., Lellouch, E., Pau, S., Renner, S., Roques, F., Fienga, A., et al. 2006, The two Titan stellar occultations of 14 November 2003, J. Geophys. Res., Vol. 111, E11S91. Download pdf

[A7] Sicardy, B., Bellucci, A., Gendron, E., Lacombe, F., Lacour, S., Lecacheux, J., Lellouch, E., Renner, S., Pau, S., Roques, F., Widemann, T., Colas, F., et al. 2006, Charon : Size and Constraints on the Atmosphere From a Stellar Occultation, Nature, vol. 439, 52-54, 5 January 2006.

[A6] Sicardy, B., Widemann, T., Lellouch, E., Veillet, C., Cuillandre, J.-C et al. 2003, Large Changes In PlutoĠs Atmosphere As Revealed By Recent Stellar Occultations,  Nature, vol. 424, 168-170, 10 July 2003. Download pdf

[A5] Raynaud, E., Drossart, P., Matcheva, K., Sicardy, B., Hubbard, W. B., Roques, F., Widemann, T., Gladstone, G. R., Waite,  J. H., Nadeau, D., Bastien, P., Doyon, R., Hill, R., Rieke, M. J., And Marley, M. 2003, The 10 October 1999 HIP 9369 Occultation by The Northern Polar Region of Jupiter: Ingress and Egress Lightcurves Analysis, Icarus, 162, 2, 344-361.

[A4] Fegley, B., Klingelhofer, G., Lodders, K., Widemann, T. 1997, Geochemistry of Surface-Atmosphere Interactions on Venus, Venus II, S.W. Bougher, D.M. Hunten, & R.J. Phillips Eds., University of Arizona Press, Tucson, pp. 591-636.

[A3] Bertaux, J.L., Widemann, T., Hauchecorne, A., Moroz, V.I., Ekonomov, A.P. 1996, Vega-1 and Vega-2 Entry Probes: an Investigation of Local UV Absorption (220 - 400 nm) In The Atmosphere of Venus (SO2, Aerosols, Cloud Structure), Journ. Geophys. Research, Vol. 101, NĦE5, pp. 12709-12745.

[A2] Widemann, T., Bertaux, J.L., Querci, F., Querci, M. 1994, High Resolution Spectroscopy of Stars Through Telluric Water Vapor Absorption Band Near 936 nm, I.- Methodology and First Results, Astron. Astrophys. 282, 879.

[A1] Bertaux, J. L., Megie, G., Widemann, T., Chassefire, E., Pellinen, R., Kyrola, E., Korpela, S., and Simon, P. 1991, Monitoring of ozone trend by stellar occultations: The Gomos instrument. Adv. Space Res., 11(3) :237-242.

 

 

2011-2016

ConfŽrences internationales invitŽes avec publications des actes

Invited international conferences with published acts/abstracts

[I9] Widemann, T., Tanga, P., Vandaele, A.C. 2013, Mesospheric temperature at terminator using SDO/HMI aureole photometry and comparison with Venus Express, C1.1 Atmospheres and ices on terrestrial planets, Davos Atmosphere and Cryosphere Assembly DACA-13, Davos, Switzerland, July 8-12, 2013

[I8] Widemann, T., Understanding Venus to understand the Earth, U43A. Cross-Fertilization Between Environmental Science and Planetary Exploration, AGU Fall Meeting Final ID: U43A-04, San Francisco, 3-7 December 2012.

[I7] Widemann, T., Y. Takahashi, S. Ohtsuki, M. Sornig, B. Sandor, E. Young, C. Tsang, T. Slanger, S. Limaye 2011, Ground-based observations of the mesosphere and lower thermosphere : coordinated campaigns with Venus Express, JpGU International Symposium 2011, Chiba-city, Japan, 22-27 May 2011.

[I6] Widemann, T., Ground-based observational constraints on the mesosphere and lower thermosphere : coordinated campaigns with Venus Express  EGU/ 6th European Geophysical Union General Assembly, Vienna, 3-8 April 2011, Geophysical Research Abstracts Vol. 13, EGU2012-A.

 

 

2011-2016

ConfŽrences internationales avec publication des rŽsumŽs

Contributed communications in international conferences with published abstracts

 

2016

[C103] T. Encrenaz, LESIA, Paris Observatory, France (therese.encrenaz@obspm.fr), T. K. Greathouse, SwRI, San Antonio, TX, USA, M.J. Richter & C. DeWitt (University of California Davis, CA, USA), T. Widemann, B. BŽzard & T. Fouchet (LESIA, Paris Observatory, France), S. K. Atreya, U. of Michigan, Ann Arbor, MI, USA, H. Sagawa, Kyoto Sangyo Univ., Japan 2016,  Variability of SO2 and HDO and thermal structure in the lower mesosphere of Venus from infrared spectroscopy, International Venus Conference 2016, Oxford, UK, 4-8 April 2016.

[C102} R. C. Ghail, Department of Civil and Environmental Engineering, Imperial College London, London, SW15 3HA, UK, (r.ghail@imperial.ac.uk), C. F. Wilson, Department of Atmospheric, Oceanic and Planetary Physics, Oxford University, Oxford, OX1 3PU, UK, (Colin.Wilson@physics.ox.ac.uk), T. Widemann, Observatoire de Paris – LESIA UMR CNRS 8109, 92190 Meudon, France, and UniversitŽ Versailles St-Quentin - DYPAC EA 2449, France, (thomas.widemann@obspm.fr), EnVision M5 Venus Orbiter Proposal: Opportunities and Challenges, International Venus Conference 2016, Oxford, UK, 4-8 April 2016.

[C101] J. Helbert, D. Wendler, I. Walter, T. Widemann, E. Marcq, A. Maturilli, S. Ferrari, M. DĠAmore, N. MŸller, M. D. Dyar, and S. Smrekar, Institute for Planetary Research, DLR, Rutherfordstrasse 2, 12489 Berlin, Germany (joern.helbert@dlr.de), the Venus Emissivity Mapper (VEM) Concept, International Venus Conference 2016, Oxford, UK, 4-8 April 2016.

[C100] S.S. Limaye, M. PŠtzold, S. Bougher, S. Bruinsma, S. Chamberlain, R.T. Clancy, J.-C. GŽrard, G. Gilli, D. Grassi, R. Haus, M. Herrmann, T. Imamura, E. Kohler, P. Krause, S. Lebonnois, A. Mahieux, A. Migliorini, F. Montmessin, C. Pere, M. Persson, A. Piccialli, M. Rengel, A. Rodin, Manuela Sornig, H. Svedhem, S. Tellmann, P. Tanga, A.C. Vandaele, T. Widemann, C. Wilson, I. MŸller-Wodarg, L. Zasova 2016, The structure of the Venus atmosphere: intercomparison of Venus Express and ground based observations of vertical temperature and density profiles, International Venus Conference 2016, Oxford, UK, 4-8 April 2016.

[C99] P. Machado, T. Widemann, J. Peralta, R. Gonalves, J.-F. Donati and D. Luz, Institute of Astrophysics and Space Sciences, Observat—rio Astron—mico de Lisboa, Ed. Leste, Tapada da Ajuda, 1349-018 Lisboa, Portugal (machado@oal.ul.pt) 2016, Ground and space based cloud-top wind velocities using CFHT/ESPaDOnS (Doppler velocimetry) and VEx/VIRTIS (cloud tracking) coordinated measurements, International Venus Conference 2016, Oxford, UK, 4-8 April 2016.

[C98] A. Piccialli, R. Moreno, T. Encrenaz, T. Fouchet, E. Lellouch, A. Moullet, T. Widemann 2016, Mapping the thermal structure and minor species of Venus mesosphere with ALMA, International Venus Conference 2016, Oxford, UK, 4-8 April 2016.

[C97] P. Tanga, Th. Widemann, Ch. Pere, M. Roos-Serote 2016, Venus mesosphere at the terminator, studied during the solar transits, International Venus Conference 2016, Oxford, UK, 4-8 April 2016.

[C96] Th. Widemann, C. Wilson, T. Imamura, E. Lellouch, H. Svedhem, M. Nakamura, the EuroVenus consortium 2016, International ground-based support to Venus Express and Akatsuki missions, 2007-2017, International Venus Conference 2016, Oxford, UK, 4-8 April 2016.

[C95] Helbert, J.; Wendler, D.; Walter, I.; Widemann, T.; Marcq, E.; Maturilli, A.; Ferrari, S.; D'Amore, M.; MŸller, N.; Dyar, M. D.; Smrekar, S. 2016, The Venus Emissivity Mapper (VEM) Concept, 47th Lunar and Planetary Science Conference, March 21-25 2016, The Woodlands, TX.

[C94] Ghail, R. C.; Wilson, C. F.; Widemann, T. 2016,  EnVision M5 Venus Orbiter Proposal: Opportunities and Challenges, 47th Lunar and Planetary Science Conference, March 21-25 2016, The Woodlands, TX.

 

2015

[C93] Piccialli, A., Moreno, R., Encrenaz, T., Fouchet, T., Lellouch, E., Moullet, A., Widemann, T. 2015,Thermal Structure and Minor Species Distribution of Venus Mesosphere by ALMA sub-millimeter Observations, American Astronomical Society, DPS meeting #47, National Harbor, MD,  Nov. 8-13 2015, #201.03.

[C92] Dias-Oliveira, Alex; Sicardy, Bruno; Lellouch, Emmanuel; Vieira-Martins, Roberto; Assafin, Marcelo; Ign‡cio Bueno Camargo, Jœlio; Braga-Ribas, Felipe; Gomes-
Jœnior, Altair; Bendetti-Rossi, Gustavo; Colas, Franois; Decock, Alice; Doressoundiram, Alain; Dumas, Christophe; Em’lio, Marcelo; Fabrega Polleri, Joaquin; Gil-Hutton, Ricardo; Gillon, Michael; Girard, Julien; Hau, George; Ivanov, Valentin; Jehin, Emmanuel; Lecacheux, Jean; Leiva, Rodrigo; Lopez-Sisterna, Cec’lia; Mancini, Luigi; Manfroid, Jean; Maury, Alain; Meza, Erick; Morales, Nicolas; Nagy, Leslie; Opitom, Cyrielle; Ortiz, JosŽ Luiz; Pollock, Joe; Roques, Franoise; Snodgrass, Colin; Franois Soulier, Jean; Thirouin, Audrey; Vanzi, Leonardo; Widemann, T.; Reichart, Daniel; LaCluyze, Aaron; Haislip, Joshua B.; Ivarsen, Kevin; Dominik, Martin; Jżrgensen, Uffe; Skottfelt, Jesper 2015, American Astronomical Society, DPS meeting #47, National Harbor, MD,  Nov. 8-13 2015, id.200.09

[C91] Limaye, S. S.; Bougher, S.; Chamberlain, S.; Clancy, R. T.; Gilli, G.; Grassi, D.; Haus, R.; Herrmann, M.; Imamura, T.; Kohler, E.; Krause, P.; Lebonnois, S.; Mahieux, A.; Sandor, A.; Sornig, M.; Svedhem, H.; Tellmann, S.; Vandaele, A. C.; Widemann, T.; Wilson, C.; Mueller-Wodarg, I.; Zasova, L. 2015, Improved Knowlegde of Venus Atmospheric Structure, European Planetary Science Congress 2015, held 27 September - 2 October, 2015 in Nantes, France, id.EPSC2015-758.

[C90] Pre, C.; Tanga, P.; Widemann, T.; Mahieux, A.; Wilquet, V.; Vandaele, A. C. 2015, The vertical density profile of the mesosphere of Venus by independent measurements from SPICAV/SOIR and aureole photometry, European Planetary Science Congress 2015, held 27 September - 2 October, 2015 in Nantes, France, id.EPSC2015-692.

[C89] Machado, P.; Widemann, T.; Peralta, J.; Luz, D. 2015, Ground and space based cloud-top wind velocities using CFHT/ESPaDOnS (Doppler velocimetry) and VEx/VIRTIS (cloud tracking) coordinated measurements, European Planetary Science Congress 2015, held 27 September - 2 October, 2015 in Nantes, France, id.EPSC2015-666.

[C88] Piccialli, A.; Moreno, R.; Encrenaz, T.; Fouchet, T.; Lellouch, E.; Moullet, A.; Widemann, T. 2015, Thermal structure and minor species of Venus mesosphere by ALMA submm ground-based observations, European Planetary Science Congress 2015, held 27 September - 2 October, 2015 in Nantes, France, id.EPSC2015-586.

[C87] Encrenaz, T.; Greathouse, T.; Richter, M.; DeWitt, C.; Lacy, J.; Widemann, T.; BŽzard, B.; Fouchet, T.; Atreya, S.; Sagawa, H. 2015, Variability of SO2 and HDO at the cloudtop of Venus from high-resolution infrared spectroscopy, European Planetary Science Congress 2015, held 27 September - 2 October, 2015 in Nantes, France, id.EPSC2015-113.

[C86] Encrenaz, T., Greathouse, T.K., Richter, M.J., Lacy, J.H., Widemann, T., BŽzard, B., deWitt, C., Atreya, S.K., Imaging spectroscopy of Venus in the thermal infrared : daily variations of the thermal structure, EGU General Assembly 2015, April, 2015 in Vienna, Austria.

 

2014

[C85] Widemann, T., Jaeggli, S., Reardon, K., Tanga, P., Pre, C., Pasachoff, J.M., Vandaele, A.-C., Wilquet, V., Mahieux, A., Wilson, C., Venus' thermospheric temperature field using a refraction model at terminator : comparison with 2012 transit observations using SDO/HMI, VEx/SPICAV/SOIR and NSO/DST/FIRS, American Astronomical Society, DPS meeting #44, held in Tucson, AZ Oct. 14-19 2014, #508.08.

[C84] Cutts, J. A.,, Ocampo, A., Limaye, S., Glaze, L., Svedhem, H., Nakamura, M., Zasova, L.,  Wilson, C., and Widemann, T. 2014, International Collaboration for Venus Exploration, International Coordination of Planning for Space Exploration, 40th COSPAR Scientific Assembly, Moscow, 3-9 August 2014.

[C83] Cutts J. A., Widemann T. Limaye S. Baines K. H. Wilson C. F. Voss P. Hall J. L.
Nott J. Kerzhanovich V. 2014, Exploration Targets in the Venus Cloud Regions #6015 - Poster session : Within the Atmosphere. Workshop on Venus Exploration Targets, V. Sharpton, L. Esposito, C. Sotin conv., Lunar and Planetary Institute, 3600 Bay Area Boulevard, Houston TX 77058.

[C82] Limaye S. S. Glaze L. S. Cutts J. A. Wilson C. F. Parish H. F. Schubert G. Baines K. H.
Covey C. C. Widemann T. 2014, Exploration Targets in the Lower Atmosphere of Venus #6021 - Poster session : Within the Atmosphere. Workshop on Venus Exploration Targets, V. Sharpton, L. Esposito, C. Sotin conv., Lunar and Planetary Institute, 3600 Bay Area Boulevard, Houston TX 77058.

[C81] Widemann T. Wilquet V. McGouldrick K. MŠŠttŠnen A. Cutts J. Wilson C. Jessup K. L. Limaye S. Polidan R. Griffin K. the EuroVenus consortium , 2014, VenusĠ Robotic Exploration at Upper Cloud Level: A US-European Perspective #6029 - Poster session : Within the Atmosphere. Workshop on Venus Exploration Targets, V. Sharpton, L. Esposito, C. Sotin conv., Lunar and Planetary Institute, 3600 Bay Area Boulevard, Houston TX 77058.

[C80] Angelo Pio Rossi, Baptiste Cecconi, Markus Fraenz, Axel Hagermann, David Heather, Pascal Rosenblatt, Hakan Svedhem, and Thomas Widemann 2014, The ESA Planetary Science Archive User Group (PSA-UG), Geophysical Research Abstracts Vol. 16, EGU2014-5102, EGU General Assembly 2014, İ Author(s) 2014.

[C79] Emmanuel Marcq, ThŽrse Encrenaz, Emmanuel Lellouch, Jean-Loup Bertaux, Thomas Widemann, and Mirel Birlan 2014, Measurements of carbon monoxide above Venus' cloud top from IRTF/CSHELL observations, Geophysical Research Abstracts
Vol. 16, EGU2014-6599, 
EGU General Assembly 2014 
İ Author(s) 2014.

[C78] Widemann, T.,  MŠŠttŠnen, A., Wilquet, V.,  McGouldrick, K.,  Jessup, Kandis Lea, Wilson, C.,  Limaye, S., and the EuroVenus consortium 2014, Dynamics and chemistry of VenusĠ large and complex cloud system : a science case for an in-situ long-term chemical laboratory, Geophysical Research Abstracts
Vol. 16, EGU2014-9273-1, 2014
 EGU General Assembly 2014
 İ Author(s) 2014.

[C77] Limaye, S.,  Ashish, K., Alam, M., Landis, G., Widemann, T., Kremic, T. 2014, Sampling the Cloudtop Region on Venus, Geophysical Research Abstracts Vol. 16, EGU2014-8720-6, 2014, EGU General Assembly 2014, İ Author(s) 2014.

[C76] Widemann, T.,  Tanga P., Pre, C.,  Jaeggli, S., Reardon, K., and Pasachoff, J. M. 2014, VenusĠ thermospheric temperature field using a refraction model at terminator : comparison with 2012 transit observations using SDO/HMI and NSO/DST/FIRS, Geophysical Research Abstracts
Vol. 16, EGU2014-12916, 2014
 EGU General Assembly 2014
 İ Author(s) 2014.

[C75] T. Widemann, K. Griffin, A. MŠŠttŠnen, V. Wilquet, K. McGouldrick, K.L Jessup, C. Wilson, R. Polidan, D. Sokol, G. Lee, L. Bolisay, N. Barnes, S. Limaye, the EuroVenus consortium, Venus' robotic exploration at cloud level : a US-European perspective, International Academy of Astronautics Space Exploration Conference, pre-Summit Conference on Planetary Robotic and Human Spaceflight Exploration, January 09, 2014, Washington DC, USA

[C74] Limaye, S., L. Zasova, C. Wilson, R.C. Ghail, A.C. Vandaele, W. J. Markiewicz, T. Widemann, T. Imamura, F. Montmessin, E. Marcq, James A. Cutts 2014, Planetary Robotic Exploration and Opportunities for International Collaboration on Climate Change:  A Comparative Climatology Case Study, International Academy of Astronautics Space Exploration Conference, pre-Summit Conference on Planetary Robotic and Human Spaceflight Exploration, January 09, 2014, Washington DC, USA

 

2013

[C73] Widemann, T, Pasachoff, J.M., Vandaele, A.C., Wilquet, V., Mahieux, A., Wilson, C., Venus' thermospheric temperature field using a refraction model at terminator : American Astronomical Society, DPS meeting #43, held in Denver, CO Oct. 14-19 2014, #508.08.

[C72] Jaeggli, S., Reardon, K.P., Pasachoff, J.M., Schneider, G., Widemann, T., Tanga, P. 2013, 1565 nm Observations of the Transit of Venus, Proxy for a Transiting Exoplanet, American Astronomical Society /  44th Meeting of the Solar Physics Division (SPD),  Bozeman, Montana 8-11 July 2013.

[C71] Widemann, T., Tanga, P., Vandaele, A.C., Wilquet, V., Mahieux, A. 2013, Mesospheric temperature at terminator using SDO/HMI aureole photometry and comparison with Venus Express, EGU General Assembly 2013, held 7-12 April, 2013 in Vienna, Austria, id. EGU2013-5690.

[C70] Marcq, E., Encrenaz, T., Widemann, T. Lellouch, E., Fouchet, T. 2013, Ground-based C-SHELL/IRTF observations of Venus near 4.53μm, EGU General Assembly 2013, held 7-12 April, 2013 in Vienna, Austria, id. EGU2013-5295.

[C69] Encrenaz, T., Greathouse, T.,  Richter, M.,  Lacy, J., BŽzard, B. Fouchet, T., DeWitt, C. and Widemann, T. 2013, Mapping of SO2 on Venus within the H2SO4 cloud using ground-based infrared imaging spectroscopy, EGU General Assembly 2013, held 7-12 April, 2013 in Vienna, Austria, id. EGU2013-3967.

[C68] Machado, P., T. Widemann, D. Luz, J. Peralta 2013, Venus winds with ground-based Doppler velocimetry and comparison with coordinated cloud tracking method winds, 44th Lunar and Planetary Science Conference, held March 18-22, 2013 in The Woodlands, Texas. LPI Contribution No. 1719, p.1975.

[C67] Edelman, E., Pasachoff, J.M., Schneider, G., Babcock, B.A., Lu, M., Reardon, K., Widemann, T., Tanga, P., Dantowitz, R. 2013, The 2012 Transit of Venus: A Closer Look at the Cytherean Aureole, American Astronomical Society, AAS Meeting #221, #353.04.

 

2012

[C66] Pasachoff, J.M., Schneider, G., Babcock, B.A., Lu, M., Edelman, E., Reardon, K., Widemann, T., Tanga, P., Dantowitz, R., Silverstone, M.D., Ehrenreich, D., Vidal-Madjar, A., Nicholson, P.D., Willson, R.C., Kopp, G.A., Yurchyshyn, V.B., Sterling, A.C., Scherrer, P.H., Schou, J., Golub, L., McCauley, P., Reeves, K. 2013, Three 2012 Transits of Venus: From Earth, Jupiter, and Saturn, American Astronomical Society, AAS Meeting #221, #315.06.

[C65] Widemann, Thomas; Tanga, P.; Reardon, K. P.; Limaye, S.; Wilson, C.; Vandaele, A.; Wilquet, V.; Mahieux, A.; Robert, S.; Pasachoff, J. M.; Schneider, G., Asymmetry in the Polar Mesosphere Revealed by the 2012 Venus Transit Aureole, American Astronomical Society, DPS meeting #44, Reno, NV Oct. 14-19 2012, #508.08.

[C64] Tanga, Paolo; Widemann, T.; Ambastha, A.; Babcock, B. A.; Berthier, J.; Bouley, S.; Braga-Ribas, F.; Brasch, K.; Burke, W.; Colas, F.; and 15 coauthors, The Venus Twilight Experiment: Probing The Mesosphere in 2004 And 2012, American Astronomical Society, DPS meeting #44, Reno, NV Oct. 14-19 2012, #508.07.

[C63] Pasachoff, Jay M.; Schneider, G.; Babcock, B. A.; Lu, M.; Reardon, K. P.; Widemann, T.; Tanga, P.; Dantowitz, R.; Willson, R.; Kopp, G.; and 6 coauthors, The 2012 Transit of Venus for Cytherean Atmospheric Studies and as an Exoplanet Analog, American Astronomical Society, DPS meeting #44, Reno, NV Oct. 14-19 2012, #508.06.

[C62] Braga Ribas, Felipe; Sicardy, B.; Ortiz, J. L.; Duffard, R.; Camargo, J. I. B.; Lecacheux, J.; Colas, F.; Vachier, F.; Tanga, P.; Sposetti, S.; and 25 coauthors, Stellar Occultations by Large TNOs on 2012: The February 3rd by (208996) 2003 AZ84, and the February 17th by (50000) Quaoar, American Astronomical Society, DPS meeting #44, Reno, NV Oct. 14-19 2012, #402.01.

[C61] Sicardy, Bruno; Braga-Ribas, F.; Widemann, T.; Jehin, E.; Gillon, M.; Manfroid, J.; Ortiz, J. L.; Morales, N.; Maury, A.; Assafin, M.; and 25 coauthors, Charon's Size And Orbit From Double Stellar Occultations, American Astronomical Society, DPS meeting #44, Reno, NV Oct. 14-19 2012, #304.01.

[C60] P. Machado, T. Widemann, D. Luz, J. Peralta, and S. Chamberlain, 2012, Observation of Dynamical Tracers in the Venus Atmosphere, Comparative Climatology of Terrestrial Planets, held June 25–28, 2012, in Boulder, Colorado. LPI Contribution No. 1675, id.8021.

[C59] P. Machado, T. Widemann, D. Luz, J. Peralta, and D. L. Berry 2012, New measurements of Venus winds with ground-based Doppler velocimetry at CFH, EGU/7th European Geophysical Union General Assembly, Vienna, 23-28 April 2012, Geophysical Research Abstracts Vol. 14, EGU2012-10438.

[C58] T. Encrenaz, T. K. Greathouse, H. Roe, J. H. Lacy, M. J. Richter, B. BŽzard, T. Fouchet,and T. Widemann 2012, Mapping of SO2 and HDO on Venus using thermal infrared imaging spectroscopy, EGU/7th European Geophysical Union General Assembly, Vienna, 23-28 April 2012, Geophysical Research Abstracts Vol. 14, EGU2012-5867.

 

 

2011

[C57] P. Tanga, Th. Widemann, and B. Sicardy 2011, The aureole of Venus: light refraction in the mesosphere during the solar transit of June 6, 2004, American Astronomical Society, DPS meeting #43 and 6th European Planetary Science Congress, Nantes, France, 2-7 October, 2011, EPSC-DPS Abstracts, Vol. 6, EPCS-DPS2011-1032.

[C56] P. Machado, D. Luz, and T. Widemann 2011, Characterization of Venus' cloud top dynamics using ground-based Doppler velocimetry, American Astronomical Society, DPS meeting #43 and 6th European Planetary Science Congress, Nantes, France, 2-7 October, 2011, EPSC-DPS Abstracts, Vol. 6, EPCS-DPS2011-517.

[C55] M. W. Buie, D. J. Tholen, L. H. Wasserman, B. Sicardy, L. A. Young, E. F. Young, W. Ryan, E. Ryan, K. Walsh, T. Widemann, F. Vachier, W. Beisker, T. Hall, J. Dire, C. K. Erickson, C. Nance, and M. Person 2011, Hydra stellar occultation of 2011 June 27, American Astronomical Society, DPS meeting #43 and 6th European Planetary Science Congress, Nantes, France, 2-7 October, 2011, EPSC-DPS Abstracts, Vol. 6, EPCS-DPS2011-1715.

[C54] B. Sicardy, J. L. Ortiz, M. Assafin, E. Jehin, A. Maury, E. Lellouch, R. Gil-Hutton, F. Braga-Ribas, F. Colas, J. Lecacheux, F. Roques, P. Santo Sanz, T. Widemann, N. Morales, A. Thirouin, J.I.B. Camargo, R. Vieira-Martins, M. Gillon, J. Manfroid, R. Behrend and the Eris occultation Team, 2011, Size, density, albedo and atmosphere limit of dwarf planet Eris from a stellar occultation, American Astronomical Society, DPS meeting #43 and 6th European Planetary Science Congress, Nantes, France, 2-7 October, 2011, EPSC-DPS Abstracts, Vol. 6, EPCS-DPS2011-137.

[C53] Machado, P., T. Widemann, D. Luz 2011, Characterization of VenusĠ atmospheric dynamics with ground-based Doppler velocimetry, JpGU International Symposium 2011, Chiba-city, Japan, 22-27 May 2011.

[C52] Wilson C.F., H. Svedhem, D.V. Titov, R. Hoofs, T. Widemann 2011, Venus Express science operations and co-ordinated observation planning,  JpGU International Symposium 2011, Chiba-city, Japan, 22-27 May 2011.

[C51] Young, E., Bullock, M., Tsang, C., Hall, D., Widemann, T., Wilson, C. 2011, A Balloon-Borne Mission to Observe Venus During the January 2014 Inferior Conjunction, The 20th ESA Symposium on European Rocket and Balloon Programmes and Related Research, Hyres, France, 22-26 May 2011.

[C50] Encrenaz, T., T. K. Greathouse, M. Richter, B. BŽzard, T. Fouchet, E. Marcq, T. Widemann, S. K. Atreya 2011, The synthetic spectrum of Venus in the 7-micron region, EGU/ 6th European Geophysical Union General Assembly, Vienna, 3-8 April 2011, Geophysical Research Abstracts Vol. 13, EGU2012.