1. TOI-1431b/MASCARA-5b: a highly irradiated ultrahot Jupiter orbiting one of the hottest and brightest known exoplanet host stars
- Author
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Brett C. Addison, Emil Knudstrup, Ian Wong, Guillaume Hébrard, Patrick Dorval, Ignas Snellen, Simon Albrecht, Aaron Bello-Arufe, Jose-Manuel Almenara, Isabelle Boisse, Xavier Bonfils, Shweta Dalal, Olivier D. S. Demangeon, Sergio Hoyer, Flavien Kiefer, N. C. Santos, Grzegorz Nowak, Rafael Luque, Monika Stangret, Enric Palle, René Tronsgaard, Victoria Antoci, Lars A. Buchhave, Maximilian N. Günther, 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-Hansen, Pere Pallé, 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, Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Leiden Observatory [Leiden], Universiteit Leiden [Leiden], National Space Institute [Lyngby] (DTU Space), Technical University of Denmark [Lyngby] (DTU), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National d'Études Spatiales [Toulouse] (CNES)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)
- Subjects
Radial velocity ,Hot Jupiters ,FOS: Physical sciences ,LONG-PERIOD ,EARTH-SIZED PLANET ,Astrophysics ,01 natural sciences ,010309 optics ,0103 physical sciences ,PHASE CURVE ,SPECTRAL-SYNTHESIS ,LINE-PROFILE TOMOGRAPHY ,010303 astronomy & astrophysics ,CHEMICALLY PECULIAR ,Earth and Planetary Astrophysics (astro-ph.EP) ,Exoplanets ,Earth and planetary astrophysics ,Astronomy and Astrophysics ,HOT-JUPITER ,GIANT-PLANET ,A-TYPE STARS ,13. Climate action ,Space and Planetary Science ,ANGLO-AUSTRALIAN PLANET ,Transit photometry ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Astrophysics - Earth and Planetary Astrophysics - 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., Accepted for publication in the Astronomical Journal. 39 pages, 18 figures, and 4 tables
- Published
- 2021