TOI-824 b: A New Planet on the Lower Edge of the Hot Neptune Desert,The Astronomical Journal

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TOI-824 b: A New Planet on the Lower Edge of the Hot Neptune Desert
The Astronomical Journal ( IF 5.3 ) Pub Date : 2020-09-04 , DOI: 10.3847/1538-3881/abac0c
Jennifer A. Burt _{1,

2} , Louise D. Nielsen ₃ , Samuel N. Quinn ₄ , Eric E. Mamajek ₁ , Elisabeth C. Matthews ₂ , George Zhou ₄ , Julia V. Seidel ₃ , Chelsea X. Huang ₂ , Eric Lopez ₅ , Maritza Soto ₆ , Jon Otegi _{3,

7} , Keivan G. Stassun _{8,

9} , Laura Kreidberg ₄ , Karen A. Collins ₄ , Jason D. Eastman ₄ , Joseph E. Rodriguez ₁₀ , Andrew Vanderburg ₁₁ , Samuel P. Halverson ₁ , Johanna K. Teske ₁₂ , Sharon X. Wang ₁₂ , R. Paul Butler ₁₃ , Franois Bouchy ₃ , Xavier Dumusque ₃ , Damien Segransen ₃ , Stephen A. Shectman ₁₂ , Jeffrey D. Crane ₁₂ , Fabo Feng ₁₃ , Benjamin T. Montet ₁₄ , Adina D. Feinstein ₁₅ , Yuri Beletski ₁₆ , Erin Flowers ₁₇ , Maximilian N. Gnther ₂ , Tansu Daylan ₂ , Kevin I. Collins ₁₈ , Dennis M. Conti ₁₉ , Tianjun Gan ₂₀ , Eric L. N. Jensen ₂₁ , John F. Kielkopf ₂₂ , Thiam-Guan Tan ₂₃ , Ravit Helled ₇ , Caroline Dorn ₇ , Jonas Haldemann ₂₄ , Jack J. Lissauer ₂₅ , George R. Ricker ₂ , Roland Vanderspek ₂ , David W. Latham ₄ , S. Seager _{2,

26,

27} , Joshua N. Winn ₁₇ , Jon M. Jenkins ₂₈ , Joseph D. Twicken _{28,

29} , Jeffrey C. Smith _{28,

29} , Peter Tenenbaum _{28,

29} , Scott Cartwright ₃₀ , Thomas Barclay _{5,

31} , Joshua Pepper ₃₂ , Gilbert Esquerdo ₄ , William Fong ₂

Affiliation

Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Observatoire de l’Universit de Genve, 51 Chemin des Maillettes, 1290 Versoix, Switzerland
Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
School of Physics and Astronomy, Queen Mary University London, 327 Mile End Road, London E1 4NS, UK
Institute for Computational Science, University of Zurich, Winterthurerstr. 190, CH-8057 Zurich, Switzerland
Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA
Department of Physics, Fisk University, Nashville, TN 37208, USA
Harvard–Smithsonian Center for Astrophysics, Harvard University, Cambridge, MA 02138, USA
Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706, USA
The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA
Earth & Planets Laboratory, Carnegie Institution for Science, 5241 Broad Branch Road, NW, Washington, DC 20015, USA
School of Physics, The University of New South Wales, Sydney, NSW 2052, Australia
The Department of Astronomy and Astrophysics, The University of Chicago, 5640 S. Ellis Avenue, Chicago, IL 60637, USA
Las Campanas Observatory, Vallenar, Atacama, Chile
Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA
George Mason University, 4400 University Drive, Fairfax, VA, 22030, USA
American Association of Variable Star Observers, 49 Bay State Road, Cambridge, MA 02138, USA
Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, People's Republic of China
Dept. of Physics & Astronomy, Swarthmore College, Swarthmore PA 19081, USA
Department of Physics and Astronomy, University of Louisville, Louisville, KY 40292, USA
Perth Exoplanet Survey Telescope, Perth, Western Australia, Australia
Department of Space Research & Planetary Sciences, University of Bern, Gesellschaftsstrasse 6, CH-3012 Bern, Switzerland
Space Science & Astrobiology Division, MS 245-3, NASA Ames Research Center, Moffett Field, CA 94035, USA
Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Department of Aeronautics and Astronautics, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
NASA Ames Research Center, Moffett Field, CA, 94035, USA
SETI Institute, Mountain View, CA 94043, USA
Proto-Logic LLC, 1718 Euclid Street NW, Washington, DC 20009, USA
University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, PA 18015, USA

We report the detection of a transiting hot Neptune exoplanet orbiting TOI-824 (SCR J1448-5735), a nearby (d = 64 pc) K4V star, using data from the \textit{Transiting Exoplanet Survey Satellite} (TESS). The newly discovered planet has a radius, $R_{\rm{p}}$ = 2.93 $\pm$ 0.20 R$_{\oplus}$, and an orbital period of 1.393 days. Radial velocity measurements using the Planet Finder Spectrograph (PFS) and the High Accuracy Radial velocity Planet Searcher (HARPS) spectrograph confirm the existence of the planet and we estimate its mass to be $M_{\rm{p}}$ = 18.47 $\pm$ 1.84 M$_{\oplus}$. The planet's mean density is $\rho_{\rm{p}}$ = 4.03$^{+0.98}_{-0.78}$ g cm$^{-3}$ making it more than twice as dense as Neptune. TOI-824 b's high equilibrium temperature makes the planet likely to have a cloud free atmosphere, and thus an excellent candidate for follow up atmospheric studies. The detectability of TOI-824 b's atmosphere from both ground and space is promising and could lead to the detailed characterization of the most irradiated, small planet at the edge of the hot Neptune desert that has retained its atmosphere to date.

中文翻译：

TOI-824 b：热海王星沙漠下缘的新行星

我们报告使用来自\textit{Transiting Exoplanet Survey Satellite} (TESS) 的数据，检测到一颗围绕TOI-824 (SCR J1448-5735) 运行的热海王星系外行星，这是一颗附近（d = 64 pc）K4V 恒星。这颗新发现的行星半径为 $R_{\rm{p}}$ = 2.93 $\pm$ 0.20 R$_{\oplus}$，公转周期为 1.393 天。使用行星探测器光谱仪 (PFS) 和高精度径向速度行星搜索仪 (HARPS) 光谱仪进行的径向速度测量证实了这颗行星的存在，我们估计它的质量为 $M_{\rm{p}}$ = 18.47 $\下午$ 1.84 M$_{\oplus}$。这颗行星的平均密度为 $\rho_{\rm{p}}$ = 4.03$^{+0.98}_{-0.78}$ g cm$^{-3}$，使其密度是海王星的两倍多。TOI-824 b 的高平衡温度使这颗行星可能有无云大气层，因此是后续大气研究的绝佳候选者。从地面和太空对 TOI-824 b 大气的可探测性是有希望的，并且可能导致对迄今为止仍保留其大气的炎热海王星沙漠边缘的受辐射最严重的小行星进行详细描述。

更新日期：2020-09-04

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