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Preprints, Working Papers, ...

TOI-1431b/MASCARA-5b: A Highly Irradiated Ultra-Hot Jupiter Orbiting One of the Hottest & Brightest Known Exoplanet Host Stars

Brett Christopher Addison Emil Knudstrup Ian Wong Guillaume Hebrard 1 Patrick Dorval Ignas Snellen 2 Simon Albrecht Aaron Bello-Arufe 3 Jose-Manuel Almenara 4 Isabelle Boisse 5 Xavier Bonfils 4 Shweta Dalal Olivier Demangeon Sergio Hoyer Flavien Kiefer N. C. Santos Grzegorz Nowak Rafael Luque Monika Stangret Enric Palle Rene Tronsgaard Victoria Antoci Lars A. Buchhave Maximilian N. Gunther Tansu Daylan Felipe Murgas Hannu Parviainen Emma Esparza-Borges Nicolas Crouzet Norio Narita Akihiko Fukui Kiyoe Kawauchi Noriharu Watanabe Markus Rabus Marshall C. Johnson Gilles P. P. L. Otten Geert Jan Talens Samuel H. C. Cabot Debra A. Fischer Frank Grundahl Mads Fredslund Andersen Jens Jessen-Hanse Pere Palle Avi Shporer David R. Ciardi Jake T. Clark Robert A. Wittenmyer Duncan J. Wright Jonathan Horner Karen A. Collins Eric L. N. Jensen John F. Kielkopf Richard P. Schwarz Gregor Srdoc Mesut Yilmaz Hakan Volkan Senavci Brendan Diamond Daniel Harbeck Thaddeus D. Komacek Jeffrey C. Smith Songhu Wang Jason D. Eastman Keivan G. Stassun David W. Latham Roland Vanderspek Sara Seager Joshua N. Winn Jon M. Jenkins Dana R. Louie Luke G. Bouma Joseph D. Twicken Alan M. Levine Brian Mclean 
Abstract : We present the discovery of a highly irradiated and moderately inflated ultra-hot Jupiter, TOI-1431b/MASCARA-5b (HD 201033b), first detected by NASA's Transiting Exoplanet Survey Satellite mission (TESS) and the Multi-site All-Sky CAmeRA (MASCARA). The signal was established to be of planetary origin through radial velocity measurements obtained using SONG, SOPHIE, FIES, NRES, and EXPRES, which show a reflex motion of $K=294.1\pm1.1$ m s$^{-1}$. A joint analysis of the TESS and ground-based photometry and radial velocity measurements reveals that TOI-1431b has a mass of $M_{p}=3.12\pm0.18$ $\rm{M_J}$ ($990\pm60$ M$_{\oplus}$), an inflated radius of $R_{p}=1.49\pm0.05$ $\rm{R_J}$ ($16.7\pm0.6$ R$_{\oplus}$), and an orbital period of $P=2.650237\pm0.000003$ d. Analysis of the spectral energy distribution of the host star reveals that the planet orbits a bright ($\mathrm{V}=8.049$ mag) and young ($0.29^{+0.32}_{-0.19}$ Gyr) Am type star with $T_{\rm eff}=7690^{+400}_{-250}$ $\rm{K}$, resulting in a highly irradiated planet with an incident flux of $\langle F \rangle=7.24^{+0.68}_{-0.64}\times$10$^9$ erg s$^{-1}$ cm$^{-2}$ ($5300^{+500}_{-470}\mathrm{S_{\oplus}}$) and an equilibrium temperature of $T_{eq}=2370\pm70$ K. TESS photometry also reveals a secondary eclipse with a depth of $127^{+4}_{-5}$ppm as well as the full phase curve of the planet's thermal emission in the red-optical. This has allowed us to measure the dayside and nightside temperature of its atmosphere as $T_\mathrm{day}=3004\pm64$ K and $T_\mathrm{night}=2583\pm63$ K, the second hottest measured nightside temperature. The planet's low day/night temperature contrast ($\sim$420 K) suggests very efficient heat transport between the dayside and nightside hemispheres.
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Preprints, Working Papers, ...
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Contributor : Xavier Bonfils Connect in order to contact the contributor
Submitted on : Tuesday, November 30, 2021 - 8:50:09 PM
Last modification on : Friday, August 5, 2022 - 12:36:01 PM

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  • HAL Id : insu-03458424, version 1
  • ARXIV : 2104.12078


Brett Christopher Addison, Emil Knudstrup, Ian Wong, Guillaume Hebrard, Patrick Dorval, et al.. TOI-1431b/MASCARA-5b: A Highly Irradiated Ultra-Hot Jupiter Orbiting One of the Hottest & Brightest Known Exoplanet Host Stars. 2021. ⟨insu-03458424⟩



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