'A' Gap: Exploring the new parameter space of ultra hot Jupiters around A-type host stars

0 Assigned ID: 875 ----- Attempting Submission 1 (Fri Mar 06 22:41:40 GMT 2020) ----- HST Phase I Proposal 875 successfully submitted. Receipt: # 875-1 ----- Attempting Submission 2 (Sat Mar 07 00:27:29 GMT 2020) ----- 0 ----- Attempting Submission 1 (Fri Jun 19 21:08:13 GMT 2020) ----- HST Phase II Proposal 16307 successfully submitted. Receipt: # 16307-1 ----- Attempting Submission 2 (Tue Jun 23 16:27:48 GMT 2020) ----- ----- Attempting Submission 3 (Tue Jun 30 07:03:50 GMT 2020) ----- ----- Attempting Submission 4 (Sat Nov 28 00:24:16 GMT 2020) ----- 'A' Gap: Exploring the new parameter space of ultra hot Jupiters around A-type host stars Ultra hot Jupiters are unique planetary objects that have a dayside temperature exceeding 2200K due to intense irradiation from the host star. An important aspect hereby is the spectral type of the host star, which determines the wavelength range at which most of the stellar radiation is emitted. This in turn impacts the efficiency of the planetary atmosphere to absorb the incoming stellar flux. As most of the observed ultra hot Jupiters orbit F/G stars, the parameter space of planets around A-type stars has not been explored sufficiently to be able to empirically verify this theoretical prediction. We propose to observe two recently discovered ultra hot Jupiters that orbit A-type stars to study how hot stars can affect the thermal structure and atmospheric composition of the planet. Reduced-gyro operations have no impact on this program. Schedulability is higher than 70 for all 4 visits and required sptial scan speed is less than 5 arcsec/sec. Guangwei Fu is a graduate student working with Prof. Drake Deming. He has published a statistical study on HST WFC3 data and is currently working on HST data reduction and retrieval. He is also the PI a past successful HST exoplanet program (ID: 15969). Prof. Drake Deming is an expert in exoplanet atmosphere characterization using space telescopes. He lead the very first study using HST WFC3 in spatial scan mode on HD189733b and XO-1 in 2013. He is also the PI of numerous past successful HST exoplanet programs (ID: 12181, 12449, 12495, 12844, 14260) with a total of 244 orbits allocated. Prof. Eliza Kempton is an expert in exoplanet atmosphere modelling and retrieval. Jegug Ih is a graduate student working with Prof. Eliza Kempton on spectral retrieval using PLATON. Dr. Matej Malik is a post-doc working with Prof. Eliza Kempton and an expert in radiative transfer models of exoplanet atmospheres. Exoplanets and Exoplanet Formation 6 false false false false false false false false SUPPORTED EXT-STAR EXTRA-SOLAR PLANET This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 EXT-STAR EXTRA-SOLAR PLANET This object was generated by the targetselector and retrieved from the SIMBAD database. 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