Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• The Astronomical journal, 2021-12, Vol.162 (6)

Ort / Verlag

American Astronomical Society

Erscheinungsjahr

2021

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• 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.