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K2-280 b-a low density warm sub-Saturn around a mildly evolved star

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DOI

  • Grzegorz Nowak, Instituto Astrofisico de Canarias, University of La Laguna
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  • Enric Palle, Instituto Astrofisico de Canarias, University of La Laguna
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  • Davide Gandolfi, University of Turin
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  • Hans J. Deeg, Instituto Astrofisico de Canarias, University of La Laguna
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  • Teruyuki Hirano, Tokyo Institute of Technology
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  • Oscar Barragán, University of Turin, University of Oxford
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  • Masayuki Kuzuhara, National Institutes of Natural Sciences, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
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  • Fei Dai, Princeton University, Massachusetts Institute of Technology
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  • Rafael Luque, Instituto Astrofisico de Canarias, University of La Laguna
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  • Carina M. Persson, Chalmers University of Technology
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  • Malcolm Fridlund, Chalmers University of Technology, Leiden University
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  • Marshall C. Johnson, Las Cumbres Observatory Global Telescope Network, Inc
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  • Judith Korth, University of Cologne
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  • John H. Livingston, University of Tokyo
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  • Sascha Grziwa, University of Cologne
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  • Savita Mathur, Instituto Astrofisico de Canarias, University of La Laguna
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  • Artie P. Hatzes, Karl Schwarzschild Observatory
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  • Jorge Prieto-Arranz, Instituto Astrofisico de Canarias, University of La Laguna
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  • David Nespral, Instituto Astrofisico de Canarias, University of La Laguna
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  • Diego Hidalgo, Instituto Astrofisico de Canarias, University of La Laguna
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  • Maria Hjorth
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  • Simon Albrecht
  • Vincent Van Eylen, Princeton University
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  • Kristine W.F. Lam, Technical University of Berlin
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  • William D. Cochran, University of Texas at Austin
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  • Massimiliano Esposito, Karl Schwarzschild Observatory
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  • Szilárd Csizmadia, German Aerospace Center
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  • Eike W. Guenther, Karl Schwarzschild Observatory
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  • Petr Kabath, Czech Academy of Sciences
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  • Pere Blay, Valencian International University (VIU)
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  • Rafael Brahm, Universidad Adolfo Ibanez, Instituto Milenio de Astrofísica
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  • Andrés Jordán, Universidad Adolfo Ibanez, Instituto Milenio de Astrofísica
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  • Néstor Espinoza, Max Planck Institute for Astronomy
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  • Felipe Rojas, Instituto Milenio de Astrofísica, Pontificia Universidad Catolica de Chile
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  • Núria Casasayas Barris, Instituto Astrofisico de Canarias, University of La Laguna
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  • Florian Rodler, European Southern Observatory
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  • Roi Alonso Sobrino, Instituto Astrofisico de Canarias, University of La Laguna
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  • Juan Cabrera, German Aerospace Center
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  • Ilaria Carleo, Wesleyan University
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  • Alexander Chaushev, Technical University of Berlin
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  • Jerome De Leon, University of Tokyo
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  • Philipp Eigmüller, German Aerospace Center
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  • Michael Endl, University of Texas at Austin
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  • Anders Erikson, German Aerospace Center
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  • Akihiko Fukui, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
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  • Iskra Georgieva, Chalmers University of Technology
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  • Lucía González-Cuesta, Instituto Astrofisico de Canarias, University of La Laguna
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  • Emil Knudstrup
  • Mikkel N. Lund
  • Pilar Montañes Rodríguez, Instituto Astrofisico de Canarias, University of La Laguna
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  • Felipe Murgas, Instituto Astrofisico de Canarias, University of La Laguna
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  • Norio Narita, Instituto Astrofisico de Canarias, National Institutes of Natural Sciences, National Institutes of Natural Sciences - National Astronomical Observatory of Japan, Japan Science and Technology Agency
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  • Prajwal Niraula, Massachusetts Institute of Technology
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  • Martin Pätzold, University of Cologne
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  • Heike Rauer, Technical University of Berlin, German Aerospace Center
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  • Seth Redfield, Wesleyan University
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  • Ignasi Ribas, CSIC, Institute of Space Studies of Catalonia
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  • Marek Skarka, Czech Academy of Sciences, Masaryk University
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  • Alexis M.S. Smith, German Aerospace Center
  • ,
  • Jano Subjak, Czech Academy of Sciences, Charles University

We present an independent discovery and detailed characterization of K2-280 b, a transiting low density warm sub-Saturn in a 19.9-d moderately eccentric orbit (e = 0.35 -0.04+0.05) from K2 campaign 7. A joint analysis of high precision HARPS, HARPS-N, and FIES radial velocity measurements and K2 photometric data indicates that K2-280 b has a radius of Rb = 7.50 ± 0.44 R⊕ and a mass of Mb = 37.1 ± 5.6 M⊕, yielding a mean density of ρb = 0.48 -0.10+0.13 g cm-3. The host star is a mildly evolved G7 star with an effective temperature of Teff = 5500 ± 100 K, a surface gravity of log g = 4.21 ± 0.05 (cgs), and an iron abundance of [Fe/H] = 0.33 ± 0.08 dex, and with an inferred mass of M∗ = 1.03 ± 0.03 M⊙ and a radius of R∗ = 1.28 ± 0.07 R⊙. We discuss the importance of K2-280 b for testing formation scenarios of sub-Saturn planets and the current sample of this intriguing group of planets that are absent in the Solar system.

OriginalsprogEngelsk
TidsskriftMonthly Notices of the Royal Astronomical Society
Vol/bind497
Nummer4
Sider (fra-til)4423-4435
Antal sider13
ISSN0035-8711
DOI
StatusUdgivet - okt. 2020

Bibliografisk note

Funding Information:
This work is partly supported by JSPS KAKENHI Grant Numbers JP18H01265, JP18H05439, and JP16K17660, and JST PRESTO Grant Number JPMJPR1775. RB acknowledges support from FONDECYT Postdoctoral Fellowship Project 3180246. AJ acknowledges support from FONDECYT project 1171208.

Publisher Copyright:
© 2020 The Author(s).

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

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