Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 925, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/2041-8213/ac4968
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This study analyzes the thermal emission spectrum of the ultra-hot Jupiter KELT-20b to reveal the direct relationship between planetary atmosphere and its surrounding star. By comparing it with other similar ultra-hot Jupiters, we can gain a better understanding of how different types of stars influence planetary atmospheres.
Know thy star, know thy planetary atmosphere. Every exoplanet with atmospheric measurements orbits around a star, and the stellar environment directly affects the planetary atmosphere. Here we present the emission spectrum of ultra-hot Jupiter KELT-20b which provides an observational link between host-star properties and planet atmospheric thermal structure. It is currently the only planet with thermal emission measurements in the T-eq similar to 2200 K range that orbits around an early A-type star. By comparing it with other similar ultra-hot Jupiters around FGK stars, we can better understand how different host-star types influence planetary atmospheres. The emission spectrum covers 0.6-4.5 mu m with data from TESS, HST WFC3/G141, and Spitzer 4.5 mu m channel. KELT-20b has a 1.4 mu m water feature strength metric of S-H2O = -0.097 +/- 0.02 and a blackbody brightness temperature difference of 528 K between WFC3/G141 (T-b = 2402 +/- 14 K) and Spitzer 4.5 mu m channel (T-b = 2930 +/- 59 K). These very large H2O and CO emission features combined with the A-type host star make KELT-20b a unique planet among other similar hot Jupiters. The abundant FUV, NUV, and optical radiation from its host star (T-eff = 8720 +/- 250 K) is expected to be the key that drives its strong thermal inversion and prominent emission features based on previous PHOENIX model calculations.
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