Journal
ASTROPHYSICAL JOURNAL
Volume 760, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/760/2/140
Keywords
eclipses; infrared: planetary systems; stars: individual (WASP-12, Bergfors-6); techniques: photometric; techniques: spectroscopic
Categories
Funding
- UCLA Dissertation Year Fellowship
- EACM
- NASA through JPL/Caltech
- NASA through Space Telescope Science Center
- Japanese Ministry of Education, Culture, Sports, Science and Technology [21340045]
- Grants-in-Aid for Scientific Research [23224005, 21340045] Funding Source: KAKEN
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We revisit the atmospheric properties of the extremely hot Jupiter WASP-12b in light of several new developments. First, we present new narrowband (2.315 mu m) secondary eclipse photometry, which exhibits a planet/star flux ratio of 0.45% +/- 0.06%, corresponding to a brightness temperature of 3640 +/- 230 K; second, recent Spitzer/Infrared Array Camera and Hubble Space Telescope/Wide Field Camera 3 observations; and third, a recently observed star only 1 '' from WASP-12, which has diluted previous observations and which we further characterize here. We correct past WASP-12b eclipse measurements for the presence of this object, and we revisit the interpretation of WASP-12b's dilution-corrected emission spectrum. The resulting planetary emission spectrum is well approximated by a blackbody, and consequently our primary conclusion is that the planet's infrared photosphere is nearly isothermal. Thus, secondary eclipse spectroscopy is relatively ill suited to constrain WASP-12b's atmospheric abundances, and transmission spectroscopy may be necessary to achieve this goal.
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