TOI-1431b/MASCARA-5b: A Highly Irradiated Ultra-Hot Jupiter Orbiting One of the Hottest & Brightest Known Exoplanet Host Stars - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astronomical Journal Year : 2021

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

Brett Addison
Emil Knudstrup
  • Function : Author
Ian Wong
  • Function : Author
Patrick Dorval
  • Function : Author
Ignas Snellen
Simon Albrecht
  • Function : Author
Isabelle Boisse
Shweta Dalal
  • Function : Author
Olivier Demangeon
Sergio Hoyer
N. C. Santos
  • Function : Author
Grzegorz Nowak
  • Function : Author
Rafael Luque
Monika Stangret
  • Function : Author
Enric Palle
  • Function : Author
René Tronsgaard
  • Function : Author
Victoria Antoci
Lars Buchhave
Maximilian Günther
Tansu Daylan
Felipe Murgas
  • Function : Author
Hannu Parviainen
  • Function : Author
Emma Esparza-Borges
  • Function : Author
Nicolas Crouzet
Norio Narita
  • Function : Author
Akihiko Fukui
Kiyoe Kawauchi
  • Function : Author
Noriharu Watanabe
  • Function : Author
Markus Rabus
  • Function : Author
Marshall Johnson
Gilles Otten
Geert Jan Talens
Samuel Cabot
Debra Fischer
Frank Grundahl
  • Function : Author
Mads Fredslund Andersen
Jens Jessen-Hansen
  • Function : Author
Pere Pallé
  • Function : Author
Avi Shporer
David Ciardi
Jake Clark
Robert Wittenmyer
Duncan Wright
  • Function : Author
Jonathan Horner
  • Function : Author
Karen Collins
Eric Jensen
John Kielkopf
Richard Schwarz
Gregor Srdoc
  • Function : Author
Mesut Yilmaz
  • Function : Author
Hakan Volkan Senavci
  • Function : Author
Brendan Diamond
  • Function : Author
Daniel Harbeck
  • Function : Author
Thaddeus Komacek
Jeffrey Smith
  • Function : Author
Songhu Wang
  • Function : Author
Jason Eastman
Keivan Stassun
David Latham
Roland Vanderspek
Sara Seager
Joshua Winn
Jon Jenkins
Dana Louie
Luke Bouma
Joseph Twicken
Alan 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.

Dates and versions

insu-03458424 , version 1 (30-11-2021)

Identifiers

Cite

Brett Addison, Emil Knudstrup, Ian Wong, Guillaume Hébrard, Patrick Dorval, et al.. TOI-1431b/MASCARA-5b: A Highly Irradiated Ultra-Hot Jupiter Orbiting One of the Hottest & Brightest Known Exoplanet Host Stars. The Astronomical Journal, 2021, 162 (6), pp.292. ⟨10.3847/1538-3881/ac224e⟩. ⟨insu-03458424⟩
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