학술논문
TOI-1431b/MASCARA-5b: A Highly Irradiated Ultra-Hot Jupiter Orbiting One of the Hottest & Brightest Known Exoplanet Host Stars
Document Type
Working Paper
Author
Addison, Brett Christopher; Knudstrup, Emil; Wong, Ian; Hebrard, 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, Rene; Antoci, Victoria; Buchhave, Lars A.; Gunther, Maximilian N.; Daylan, Tansu; Murgas, Felipe; Parviainen, Hannu; Esparza-Borges, Emma; Crouzet, Nicolas; Narita, Norio; Fukui, Akihiko; Kawauchi, Kiyoe; Watanabe, Noriharu; Rabus, Markus; Johnson, Marshall C.; Otten, Gilles P. P. L.; Talens, Geert Jan; Cabot, Samuel H. C.; Fischer, Debra A.; Grundahl, Frank; Andersen, Mads Fredslund; Jessen-Hanse, Jens; Palle, Pere; Shporer, Avi; Ciardi, David R.; Clark, Jake T.; Wittenmyer, Robert A.; Wright, Duncan J.; Horner, Jonathan; Collins, Karen A.; Jensen, Eric L. N.; Kielkopf, John F.; Schwarz, Richard P.; Srdoc, Gregor; Yilmaz, Mesut; Senavci, Hakan Volkan; Diamond, Brendan; Harbeck, Daniel; Komacek, Thaddeus D.; Smith, Jeffrey C.; Wang, Songhu; Eastman, Jason D.; Stassun, Keivan G.; Latham, David W.; Vanderspek, Roland; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Louie, Dana R.; Bouma, Luke G.; Twicken, Joseph D.; Levine, Alan M.; McLean, Brian
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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.
Comment: Accepted for publication in the Astronomical Journal. 39 pages, 18 figures, and 4 tables
Comment: Accepted for publication in the Astronomical Journal. 39 pages, 18 figures, and 4 tables