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The Hubble PanCET Program: A Metal-rich Atmosphere for the Inflated Hot Jupiter HAT-P-41b | | Kyle B. Sheppard
; Luis Welbanks
; Avi Mandell
; Nikku Madhusudhan
; Nikolay Nikolov
; Drake Deming
; Gregory W. Henry
; Michael H. Williamson
; David K. Sing
; Mercedes López-Morales
; Jegug Ih
; Jorge Sanz-Forcada
; Panayotis Lavvas
; Gilda E. Ballester
; Thomas M. Evans
; Antonio García Muñoz
; Leonardo A. Dos Santos
; | | Date: |
19 Oct 2020 | | Abstract: | We present a comprehensive analysis of the 0.3--5,$mu$m transit spectrum
for the inflated hot Jupiter HAT-P-41b. The planet was observed in transit with
Hubble STIS and WFC3 as part of the Hubble Panchromatic Comparative Exoplanet
Treasury (PanCET) program, and we combine those data with warm extit{Spitzer}
transit observations. We extract transit depths from each of the data sets,
presenting the STIS transit spectrum (0.29--0.93,$mu$m) for the first time.
We retrieve the transit spectrum both with a free-chemistry retrieval suite
(AURA) and a complementary chemical equilibrium retrieval suite (PLATON) to
constrain the atmospheric properties at the day-night terminator. Both methods
provide an excellent fit to the observed spectrum. Both AURA and PLATON
retrieve a metal-rich atmosphere for almost all model assumptions (most likely
O/H ratio of $log_{10}{Z/Z_{odot}} = 1.46^{+0.53}_{-0.68}$ and
$log_{10}{Z/Z_{odot}} = 2.33^{+0.23}_{-0.25}$, respectively); this is driven
by a 4.9-$sigma$ detection of H$_2$O as well as evidence of gas absorption in
the optical ($>$2.7-$sigma$ detection) due to Na, AlO and/or VO/TiO, though no
individual species is strongly detected. Both retrievals determine the transit
spectrum to be consistent with a clear atmosphere, with no evidence of haze or
high-altitude clouds. Interior modeling constraints on the maximum atmospheric
metallicity ($log_{10}{Z/Z_{odot}} < 1.7$) favor the AURA results. The
inferred elemental oxygen abundance suggests that HAT-P-41b has one of the most
metal-rich atmospheres of any hot Jupiters known to date. Overall, the inferred
high metallicity and high inflation make HAT-P-41b an interesting test case for
planet formation theories. | | Source: | arXiv, 2010.09659 | | Services: | Forum | Review | PDF | Favorites | |
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