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Anders Zinck Justesen

The Transiting Multi-planet System HD15337: Two Nearly Equal-mass Planets Straddling the Radius Gap

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  • Davide Gandolfi, Università degli Studi di Torino
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  • Luca Fossati, Austrian Academy of Sciences
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  • John H. Livingston, University Tokyo
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  • Keivan G. Stassun, Vanderbilt University, Fisk University
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  • Sascha Grziwa, Universitat zu Koln
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  • Oscar Barragán, University of Oxford
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  • Malcolm Fridlund, Chalmers University of Technology, Leiden Observatory Research Institute
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  • Daria Kubyshkina, Austrian Academy of Sciences
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  • Carina M. Persson, Chalmers University of Technology
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  • Fei Dai, Massachusetts Institute of Technology, Princeton University, Princeton, NJ
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  • Kristine W.F. Lam, Technical University of Berlin
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  • Simon Albrecht
  • Natalie Batalha, University of California, Santa Cruz
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  • Paul G. Beck, Instituto de Astrofísica de Canarias, La Laguna University
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  • Anders Bo Justesen
  • Juan Cabrera, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • Scott Cartwright, Proto-Logic LLC
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  • William D. Cochran, University of Texas, Austin, Texas
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  • Szilard Csizmadia, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • Misty D. Davies, NASA Ames Research Center
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  • Hans J. Deeg, Instituto de Astrofísica de Canarias, La Laguna University
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  • Phili Eigmüller, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • Michael Endl, University of Texas, Austin, Texas
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  • Anders Erikson, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • Massimiliano Esposito, Thüringer Landessternwarte Tautenburg (TLS)
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  • Rafael A. Garciá, Université Paris—Denis Diderot
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  • Robert Goeke, Massachusetts Institute of Technology
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  • Luciá González-Cuesta, Instituto de Astrofísica de Canarias, La Laguna University
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  • Eike W. Guenther, Thüringer Landessternwarte Tautenburg (TLS)
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  • Artie P. Hatzes, Thüringer Landessternwarte Tautenburg (TLS)
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  • Diego Hidalgo, Instituto de Astrofísica de Canarias
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  • Teruyuki Hirano, Tokyo Institute of Technology
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  • Maria Hjorth
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  • Petr Kabath, Astronomical Institute, Academy of Sciences of the Czech Republic v.v.i.
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  • Emil Knudstrup
  • Judith Korth, Universitat zu Koln
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  • Jie Li, NASA Ames Research Center
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  • Rafael Luque, Instituto de Astrofísica de Canarias, La Laguna University
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  • Savita Mathur, Instituto de Astrofísica de Canarias, La Laguna University
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  • Pilar Montañes Rodríguez, Instituto de Astrofísica de Canarias, La Laguna University
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  • Norio Narita, University Tokyo, Instituto de Astrofísica de Canarias, NINS, National Astronomical Observatory of Japan, Japan Science and Technology Agency
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  • David Nespral, Instituto de Astrofísica de Canarias, La Laguna University
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  • Prajwal Niraula, Massachusetts Institute of Technology
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  • Grzegorz Nowak, Instituto de Astrofísica de Canarias, La Laguna University
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  • Enric Palle, Instituto de Astrofísica de Canarias, La Laguna University
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  • Martin Pätzold, Universitat zu Koln
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  • Jorge Prieto-Arranz, Instituto de Astrofísica de Canarias, La Laguna University
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  • Heike Rauer, Technical University of Berlin, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, School of Business and Economics
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  • Seth Redfield, Wesleyan University Middletown
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  • Ignasi Ribas, Instituto de Ciencias del Espacio (ICE-CSIC/IEEC), Institut d'Estudis Espacials de Catalunya
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  • Marek Skarka, Astronomical Institute, Academy of Sciences of the Czech Republic v.v.i., Masaryk University
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  • Alexis M.S. Smith, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • Pamela Rowden, Open University
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  • Guillermo Torres, Harvard-Smithsonian Center for Astrophysics
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  • Vincent Van Eylen, Department of Astrophysical Sciences, Princeton University, Princeton University, Princeton, NJ
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  • Michael L. Vezie, Massachusetts Institute of Technology

We report the discovery of a super-Earth and a sub-Neptune transiting the star HD 15337 (TOI-402, TIC 120896927), a bright (V = 9) K1 dwarf observed by the Transiting Exoplanet Survey Satellite (TESS) in Sectors 3 and 4. We combine the TESS photometry with archival High Accuracy Radial velocity Planet Searcher spectra to confirm the planetary nature of the transit signals and derive the masses of the two transiting planets. With an orbital period of 4.8 days, a mass of and a radius of 1.64 ± 0.06 R , HD 15337 b joins the growing group of short-period super-Earths known to have a rocky terrestrial composition. The sub-Neptune HD 15337 c has an orbital period of 17.2 days, a mass of , and a radius of 2.39 ± 0.12 R , suggesting that the planet might be surrounded by a thick atmospheric envelope. The two planets have similar masses and lie on opposite sides of the radius gap, and are thus an excellent testbed for planet formation and evolution theories. Assuming that HD 15337 c hosts a hydrogen-dominated envelope, we employ a recently developed planet atmospheric evolution algorithm in a Bayesian framework to estimate the history of the high-energy (extreme ultraviolet and X-ray) emission of the host star. We find that at an age of 150 Myr, the star possessed on average between 3.7 and 127 times the high-energy luminosity of the current Sun.

OriginalsprogEngelsk
ArtikelnummerL24
TidsskriftAstrophysical Journal Letters
Vol/bind876
Nummer2
Antal sider12
ISSN2041-8205
DOI
StatusUdgivet - maj 2019

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