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An ultrahot Neptune in the Neptune desert

Jenkins, James S. and Díaz, Matías R. and Kurtovic, Nicolás T. and Espinoza, Néstor and Vines, Jose I. and Rojas, Pablo A. Peña and Brahm, Rafael and Torres, Pascal and Cortés-Zuleta, Pía and Soto, Maritza G. and Lopez, Eric D. and King, George W. and Wheatley, Peter J. and Winn, Joshua N. and Ciardi, David R. and Ricker, George and Vanderspek, Roland and Latham, David W. and Seager, Sara and Jenkins, Jon M. and Beichman, Charles A. and Bieryla, Allyson and Burke, Christopher J. and Christiansen, Jessie L. and Henze, Christopher E. and Klaus, Todd C. and McCauliff, Sean and Mori, Mayuko and Narita, Norio and Nishiumi, Taku and Tamura, Motohide and de Leon, Jerome Pitogo and Quinn, Samuel N. and Villaseñor, Jesus Noel and Vezie, Michael and Lissauer, Jack J. and Collins, Karen A. and Collins, Kevin I. and Isopi, Giovanni and Mallia, Franco and Ercolino, Andrea and Petrovich, Cristobal and Jordán, Andrés and Acton, Jack S. and Armstrong, David J. and Bayliss, Daniel and Bouchy, François and Belardi, Claudia and Bryant, Edward M. and Burleigh, Matthew R. and Cabrera Perez, Juan and Casewell, Sarah L. and Chaushev, Alexander and Cooke, Benjamin F. and Eigmüller, Philipp and Erikson, Anders and Foxell, Emma and Gänsicke, Boris T. and Gill, Samuel and Gillen, Edward and Günther, Maximilian N. and Goad, Michael R. and Hooton, Matthew J. and Jackman, James A. G. and Louden, Tom and McCormac, James and Moyano, Maximiliano and Nielsen, Louise D. and Pollacco, Don and Queloz, Didier and Rauer, Heike and Raynard, Liam and Smith, Alexis M. S. and Tilbrook, Rosanna H. and Titz-Weider, Ruth and Turner, Oliver and Udry, Stéphane and Walker, Simon. R. and Watson, Christopher A. and West, Richard G. and Palle, Enric and Ziegler, Carl and Law, Nicholas and Mann, Andrew W. (2020) An ultrahot Neptune in the Neptune desert. Nature Astronomy. Nature Publishing Group. doi: 10.1038/s41550-020-1142-z. ISSN 2397-3366.

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Official URL: https://www.nature.com/articles/s41550-020-1142-z

Abstract

About 1 out of 200 Sun-like stars has a planet with an orbital period shorter than one day: an ultrashort-period planet1,2. All of the previously known ultrashort-period planets are either hot Jupiters, with sizes above 10 Earth radii (R⊕), or apparently rocky planets smaller than 2 R⊕. 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 ultrashort-period planet with a radius of 4.6 R⊕ and a mass of 29 M⊕, firmly in the hot Neptune desert. Data from the Transiting Exoplanet Survey Satellite3 revealed transits of the bright Sun-like star LTT 9779 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 9.0-2.9+2.7?% of the total mass. With an equilibrium temperature around 2,000 K, it is unclear how this `ultrahot 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).

Item URL in elib:https://elib.dlr.de/136676/
Document Type:Article
Title:An ultrahot Neptune in the Neptune desert
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Jenkins, James S.Departamento de Astronomía, Universidad de Chile, Las Condes, Chile; Centro de Astrofísica y Tecnologías Afines (CATA), Santiago, ChileUNSPECIFIEDUNSPECIFIED
Díaz, Matías R.Departamento de Astronomía, Universidad de Chile, Las Condes, Chile; Centro de Astrofísica y Tecnologías Afines (CATA), Santiago, ChileUNSPECIFIEDUNSPECIFIED
Kurtovic, Nicolás T.Departamento de Astronomía, Universidad de Chile, Las Condes, ChileUNSPECIFIEDUNSPECIFIED
Espinoza, NéstorSpace Telescope Science Institute, Baltimore, MD, USAUNSPECIFIEDUNSPECIFIED
Vines, Jose I.Departamento de Astronomía, Universidad de Chile, Las Condes, ChileUNSPECIFIEDUNSPECIFIED
Rojas, Pablo A. PeñaDepartamento de Astronomía, Universidad de Chile, Las Condes, ChileUNSPECIFIEDUNSPECIFIED
Brahm, RafaelCenter of Astro-Engineering UC, Pontificia Universidad Católica de Chile, Santiago, Chile; Millennium Institute for Astrophysics, Santiago, ChileUNSPECIFIEDUNSPECIFIED
Torres, PascalCenter of Astro-Engineering UC, Pontificia Universidad Católica de Chile, Santiago, ChileUNSPECIFIEDUNSPECIFIED
Cortés-Zuleta, PíaDepartamento de Astronomía, Universidad de Chile, Las Condes, ChileUNSPECIFIEDUNSPECIFIED
Soto, Maritza G.School of Physics and Astronomy, Queen Mary University of London, London, UKUNSPECIFIEDUNSPECIFIED
Lopez, Eric D.NASA Goddard Space Flight Center, Greenbelt, MD, USAUNSPECIFIEDUNSPECIFIED
King, George W.Department of Physics, University of Warwick, Coventry, UK; Centre for Exoplanets and Habitability, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Wheatley, Peter J.Department of Physics, University of Warwick, Coventry, UK; Centre for Exoplanets and Habitability, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Winn, Joshua N.Department of Astrophysical Sciences, Princeton University, Princeton, NJ, USAUNSPECIFIEDUNSPECIFIED
Ciardi, David R.NASA Exoplanet Science Institute, Caltech, Pasadena, CA, USAUNSPECIFIEDUNSPECIFIED
Ricker, GeorgeDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USAUNSPECIFIEDUNSPECIFIED
Vanderspek, RolandRoyal Observatory of Belgium, Brussels, BelgiumUNSPECIFIEDUNSPECIFIED
Latham, David W.Center for Astrophysics | Harvard and Smithsonian, Cambridge, MA, USAUNSPECIFIEDUNSPECIFIED
Seager, SaraDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA; Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USAUNSPECIFIEDUNSPECIFIED
Jenkins, Jon M.NASA Ames Research Center, Moffett Field, CA, USAUNSPECIFIEDUNSPECIFIED
Beichman, Charles A.NASA Exoplanet Science Institute, Caltech, Pasadena, CA, USAUNSPECIFIEDUNSPECIFIED
Bieryla, AllysonCenter for Astrophysics | Harvard and Smithsonian, Cambridge, MA, USAUNSPECIFIEDUNSPECIFIED
Burke, Christopher J.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USAUNSPECIFIEDUNSPECIFIED
Christiansen, Jessie L.NASA Exoplanet Science Institute, Caltech, Pasadena, CA, USAUNSPECIFIEDUNSPECIFIED
Henze, Christopher E.NASA Ames Research Center, Moffett Field, CA, USAUNSPECIFIEDUNSPECIFIED
Klaus, Todd C.NASA Ames Research Center, Moffett Field, CA, USAUNSPECIFIEDUNSPECIFIED
McCauliff, SeanNASA Ames Research Center, Moffett Field, CA, USAUNSPECIFIEDUNSPECIFIED
Mori, MayukoDepartment of Astronomy, The University of Tokyo, Tokyo, JapanUNSPECIFIEDUNSPECIFIED
Narita, NorioKomaba Institute for Science, The University of Tokyo, Tokyo, Japan; PRESTO, JST, Tokyo, Japan; Astrobiology Center, Tokyo, Japan; National Astronomical Observatory of Japan, Tokyo, Japan; Instituto de Astrofísica de Canarias (IAC), Tenerife, SpainUNSPECIFIEDUNSPECIFIED
Nishiumi, TakuDepartment of Physics, Kyoto Sangyo University, Kyoto, JapanUNSPECIFIEDUNSPECIFIED
Tamura, MotohideDepartment of Astronomy, The University of Tokyo, Tokyo, Japan; Astrobiology Center, Tokyo, Japan; National Astronomical Observatory of Japan, Tokyo, JapanUNSPECIFIEDUNSPECIFIED
de Leon, Jerome PitogoDepartment of Astronomy, The University of Tokyo, Tokyo, JapanUNSPECIFIEDUNSPECIFIED
Quinn, Samuel N.Center for Astrophysics | Harvard and Smithsonian, Cambridge, MA, USAUNSPECIFIEDUNSPECIFIED
Villaseñor, Jesus NoelDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USAUNSPECIFIEDUNSPECIFIED
Vezie, MichaelDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USAUNSPECIFIEDUNSPECIFIED
Lissauer, Jack J.NASA Ames Research Center, Moffett Field, CA, USAUNSPECIFIEDUNSPECIFIED
Collins, Karen A.Center for Astrophysics | Harvard and Smithsonian, Cambridge, MA, USAUNSPECIFIEDUNSPECIFIED
Collins, Kevin I.George Mason University, Fairfax, VA, USAUNSPECIFIEDUNSPECIFIED
Isopi, GiovanniCampo Catino Astronomical Observatory, Guarcino, ItalyUNSPECIFIEDUNSPECIFIED
Mallia, FrancoCampo Catino Astronomical Observatory, Guarcino, ItalyUNSPECIFIEDUNSPECIFIED
Ercolino, AndreaCampo Catino Astronomical Observatory, Guarcino, ItalyUNSPECIFIEDUNSPECIFIED
Petrovich, CristobalCanadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, Ontario, Canada; Centre for Planetary Sciences, Department of Physical and Environmental Sciences, University of Toronto at Scarborough, Toronto, Ontario, CanadaUNSPECIFIEDUNSPECIFIED
Jordán, AndrésMillennium Institute for Astrophysics, Santiago, Chile; Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Peñalolén, ChileUNSPECIFIEDUNSPECIFIED
Acton, Jack S.Department of Physics and Astronomy, University of Leicester, Leicester, UKUNSPECIFIEDUNSPECIFIED
Armstrong, David J.Department of Physics, University of Warwick, Coventry, UK; Centre for Exoplanets and Habitability, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Bayliss, DanielDepartment of Physics, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Bouchy, FrançoisObservatoire de Genéve, Université de Genéve, Sauverny, SwitzerlandUNSPECIFIEDUNSPECIFIED
Belardi, ClaudiaDepartment of Physics and Astronomy, University of Leicester, Leicester, UKUNSPECIFIEDUNSPECIFIED
Bryant, Edward M.Department of Physics, University of Warwick, Coventry, UK; Centre for Exoplanets and Habitability, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Burleigh, Matthew R.Department of Physics and Astronomy, University of Leicester, Leicester, UKUNSPECIFIEDUNSPECIFIED
Cabrera Perez, JuanUNSPECIFIEDhttps://orcid.org/0000-0001-6653-5487UNSPECIFIED
Casewell, Sarah L.Department of Physics and Astronomy, University of Leicester, Leicester, UKUNSPECIFIEDUNSPECIFIED
Chaushev, AlexanderCenter for Astronomy and Astrophysics, TU Berlin, Berlin, GermanyUNSPECIFIEDUNSPECIFIED
Cooke, Benjamin F.Department of Physics, University of Warwick, Coventry, UK; Centre for Exoplanets and Habitability, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Eigmüller, PhilippUNSPECIFIEDhttps://orcid.org/0000-0003-4096-0594UNSPECIFIED
Erikson, AndersUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Foxell, EmmaDepartment of Physics, University of Warwick, Coventry, UK; Centre for Exoplanets and Habitability, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Gänsicke, Boris T.Department of Physics, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Gill, SamuelDepartment of Physics, University of Warwick, Coventry, UK; Centre for Exoplanets and Habitability, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Gillen, EdwardAstrophysics Group, Cavendish Laboratory, Cambridge, UKUNSPECIFIEDUNSPECIFIED
Günther, Maximilian N.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USAUNSPECIFIEDUNSPECIFIED
Goad, Michael R.Department of Physics and Astronomy, University of Leicester, Leicester, UKUNSPECIFIEDUNSPECIFIED
Hooton, Matthew J.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast, UKUNSPECIFIEDUNSPECIFIED
Jackman, James A. G.Department of Physics, University of Warwick, Coventry, UK; Centre for Exoplanets and Habitability, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Louden, TomDepartment of Physics, University of Warwick, Coventry, UK; Centre for Exoplanets and Habitability, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
McCormac, JamesDepartment of Physics, University of Warwick, Coventry, UK; Centre for Exoplanets and Habitability, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Moyano, MaximilianoInstituto de Astronomía, Universidad Católica del Norte, Antofagasta, ChileUNSPECIFIEDUNSPECIFIED
Nielsen, Louise D.Observatoire de Genéve, Université de Genéve, Sauverny, SwitzerlandUNSPECIFIEDUNSPECIFIED
Pollacco, DonDepartment of Physics, University of Warwick, Coventry, UK; Centre for Exoplanets and Habitability, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Queloz, DidierAstrophysics Group, Cavendish Laboratory, Cambridge, UKUNSPECIFIEDUNSPECIFIED
Rauer, HeikeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Raynard, LiamDepartment of Physics and Astronomy, University of Leicester, Leicester, UKUNSPECIFIEDUNSPECIFIED
Smith, Alexis M. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tilbrook, Rosanna H.Department of Physics and Astronomy, University of Leicester, Leicester, UKUNSPECIFIEDUNSPECIFIED
Titz-Weider, RuthUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Turner, OliverObservatoire de Genéve, Université de Genéve, Sauverny, SwitzerlandUNSPECIFIEDUNSPECIFIED
Udry, StéphaneObservatoire de Genéve, Université de Genéve, Sauverny, SwitzerlandUNSPECIFIEDUNSPECIFIED
Walker, Simon. R.Department of Physics, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Watson, Christopher A.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast, UKUNSPECIFIEDUNSPECIFIED
West, Richard G.Department of Physics, University of Warwick, Coventry, UK; Centre for Exoplanets and Habitability, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
Palle, EnricInstituto de Astrofísica de Canarias (IAC), Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL), Tenerife, SpainUNSPECIFIEDUNSPECIFIED
Ziegler, CarlDunlap Institute for Astronomy and Astrophysics, University of Toronto, Toronto, Ontario, CanadaUNSPECIFIEDUNSPECIFIED
Law, NicholasDepartment of Physics and Astronomy, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USAUNSPECIFIEDUNSPECIFIED
Mann, Andrew W.Department of Physics and Astronomy, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USAUNSPECIFIEDUNSPECIFIED
Date:2020
Journal or Publication Title:Nature Astronomy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1038/s41550-020-1142-z
Publisher:Nature Publishing Group
ISSN:2397-3366
Status:Published
Keywords:Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Eigmüller, Dr. Philipp
Deposited On:04 Nov 2020 08:41
Last Modified:04 Nov 2020 08:41

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