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26 April 2024

» arxiv » 2009.12832

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An Ultra-Hot Neptune in the Neptune desert
James S. Jenkins ; Matías R. Díaz ; Nicolás T. Kurtovic ; Néstor Espinoza ; Jose I. Vines ; Pablo A. Peña Rojas ; Rafael Brahm ; Pascal Torres ; Pía Cortés-Zuleta ; Maritza G. Soto ; Eric D. Lopez ; George W. King ; Peter J. Wheatley ; Joshua N. Winn ; David R. Ciardi ; George Ricker ; Roland Vanderspek ; David W. Latham ; Sara Seager ; Jon M. Jenkins ; Charles A. Beichman ; Allyson Bieryla ; Christopher J. Burke ; Jessie L. Christiansen ; Christopher E. Henze ; Todd C. Klaus ; Sean McCauliff ; Mayuko Mori ; Norio Narita ; Taku Nishiumi ; Motohide Tamura ; Jerome Pitogo de Leon ; Samuel N. Quinn ; Jesus Noel Villaseñor ; Michael Vezie ; Jack J. Lissauer ; Karen A. Collins ; Kevin I. Collins ; Giovanni Isopi ; Franco Mallia ; Andrea Ercolino ; Cristobal Petrovich ; Andrés Jordán ; Jack S. Acton ; David J. Armstrong ; Daniel Bayliss ; François Bouchy ; ClaudiaBelardi ; Edward M. Bryant ; Matthew R. Burleigh ; Juan Cabrera ; Sarah L. Casewell ; Alexander Chaushev ; Benjamin F. Cooke ; Philipp Eigmüller ; Anders Erikson ; Emma Foxell ; Boris T. Gänsicke ; Samuel Gill ; Edward Gillen ; Maximilian N. Günther ; Michael R. Goad ; Matthew J. Hooton ; James A. G. Jackman ; Tom Louden ; James McCormac ; Maximiliano Moyano ; Louise D. Nielsen ; Don Pollacco ; Didier Queloz ; Heike Rauer ; Liam Raynard ; Alexis M. S. Smith ; Rosanna H. Tilbrook ; Ruth Titz-Weider ; Oliver Turner ; Stéphane Udry ; Simon. R. Walker ; Christopher A. Watson ; Richard G. West ; Enric Palle ; Carl Ziegler ; Nicholas Law ; Andrew W. Mann ;
Date:	27 Sep 2020
Abstract:	About one out of 200 Sun-like stars has a planet with an orbital period shorter than one day: an ultra-short-period planet (Sanchis-ojeda et al. 2014; Winn et al. 2018). All of the previously known ultra-short-period planets are either hot Jupiters, with sizes above 10 Earth radii (Re), or apparently rocky planets smaller than 2 Re. Such lack of planets of intermediate size (the "hot Neptune desert") has been interpreted as the inability of low-mass planets to retain any hydrogen/helium (H/He) envelope in the face of strong stellar irradiation. Here, we report the discovery of an ultra-short-period planet with a radius of 4.6 Re and a mass of 29 Me, firmly in the hot Neptune desert. Data from the Transiting Exoplanet Survey Satellite (Ricker et al. 2015) revealed transits of the bright Sun-like star starname, every 0.79 days. The planet’s mean density is similar to that of Neptune, and according to thermal evolution models, it has a H/He-rich envelope constituting 9.0^(+2.7)_(-2.9)% of the total mass. With an equilibrium temperature around 2000 K, it is unclear how this "ultra-hot Neptune" managed to retain such an envelope. Follow-up observations of the planet’s atmosphere to better understand its origin and physical nature will be facilitated by the star’s brightness (Vmag=9.8).
Source:	arXiv, 2009.12832
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