HR 8799 system
I obtained the first image of exoplanets at M-band using an innovative background subtraction technique. These M-band detections extend the broad band photometric coverage out to 5microns and provide access to the strong CO fundamental absorption band at 4.5microns. The new M-band photometry shows that the HR 8799 planets are located near the L/T-type dwarf transition, similar to what was found by other studies. I also confi rmed that the best atmospheric fits are consistent with low surface gravity, dusty and non-equilibrium CO/CH4 chemistry models. ApJL paper. (Click on figures to enlarge)
First image of exoplanets at M-Band (2009 Keck HR 8799 data). Color diagram with planets at the L-T transition. Spectrum for planets HR 8799b, c, and d.