K2-290: A warm Jupiter and a mini-Neptune in a triple-star system

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DOI

  • M. Hjorth
  • A. B. Justesen
  • T. Hirano, Tokyo Institute of Technology
  • ,
  • S. Albrecht
  • D. Gandolfi, Università degli Studi di Torino
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  • F. Dai, Massachusetts Institute of Technology, Princeton University, Princeton, NJ
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  • R. Alonso, Instituto de Astrofísica de Canarias
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  • O. Barragán, Università degli Studi di Torino
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  • M. Esposito, Thüringer Landessternwarte Tautenburg (TLS)
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  • M. Kuzuhara, NINS, National Astronomical Observatory of Japan
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  • K. W.F. Lam, Technical University of Berlin
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  • J. H. Livingston, University Tokyo
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  • P. Montanes-Rodriguez, Instituto de Astrofísica de Canarias
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  • N. Narita, Instituto de Astrofísica de Canarias, NINS, National Astronomical Observatory of Japan, University Tokyo
  • ,
  • G. Nowak, Instituto de Astrofísica de Canarias
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  • J. Prieto-Arranz, Instituto de Astrofísica de Canarias
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  • S. Redfield, Wesleyan University Middletown
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  • F. Rodler, European Southern Observatory Santiago
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  • V. Van Eylen, Department of Astrophysical Sciences, Princeton University, Princeton University, Princeton, NJ
  • ,
  • J. N. Winn, Princeton University, Princeton, NJ
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  • G. Antoniciello, Università degli Studi di Torino
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  • J. Cabrera, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • W. D. Cochran, University of Texas, Austin, Texas
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  • Sz Csizmadia, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
  • ,
  • J. De Leon, University Tokyo
  • ,
  • H. Deeg, Instituto de Astrofísica de Canarias, La Laguna University
  • ,
  • Ph Eigmüller, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
  • ,
  • M. Endl, University of Texas, Austin, Texas
  • ,
  • A. Erikson, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • M. Fridlund, Chalmers University of Technology, Onsala Space Observatory, Leiden Observatory Research Institute
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  • S. Grziwa, Universitat zu Koln
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  • E. Guenther, Thüringer Landessternwarte Tautenburg (TLS)
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  • A. P. Hatzes, Thüringer Landessternwarte Tautenburg (TLS)
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  • P. Heeren, Landessternwarte Heidelberg
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  • D. Hidalgo, Instituto de Astrofísica de Canarias, La Laguna University
  • ,
  • J. Korth, Universitat zu Koln
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  • R. Luque, Instituto de Astrofísica de Canarias, La Laguna University
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  • D. Nespral, Instituto de Astrofísica de Canarias, La Laguna University
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  • E. Palle, Instituto de Astrofísica de Canarias, La Laguna University
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  • M. Pätzold, Universitat zu Koln
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  • C. M. Persson, Chalmers University of Technology, Onsala Space Observatory
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  • H. Rauer, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, School of Business and Economics, Technical University of Berlin
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  • A. M.S. Smith
  • T. Trifonov, Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany

We report the discovery of two transiting planets orbiting K2-290 (EPIC 249624646), a bright (V = 11.11) late F-type star residing in a triple-star system. It was observed during Campaign 15 of the K2 mission, and in order to confirm and characterize the system, follow-up spectroscopy and AO imaging were carried out using the FIES, HARPS, HARPS-N, and IRCS instruments. From AO imaging and Gaia data we identify two M-dwarf companions at a separation of 113 ± 2 and 2467+177155 au. From radial velocities, K2 photometry, and stellar characterization of the host star, we find the inner planet to be a mini-Neptune with a radius of 3.06 ± 0.16 R and an orbital period of P = 9.2 d. The radius of the mini-Neptune suggests that the planet is located above the radius valley, and with an incident flux of F ∼ 400 F, it lies safely outside the super-Earth desert. The outer warm Jupiter has a mass of 0.774 ± 0.047 MJ and a radius of 1.006 ± 0.050 RJ, and orbits the host star every 48.4 d on an orbit with an eccentricity e < 0.241. Its mild eccentricity and mini-Neptune sibling suggest that the warm Jupiter originates from in situ formation or disc migration.

Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume484
Issue3
Pages (from-to)3522-3536
Number of pages15
ISSN0035-8711
DOIs
Publication statusPublished - Apr 2019

    Research areas

  • Planets, Planets and satellites: detection, Planets and satellites: formation, Planets and satellites: individual: K2-290, Satellites: individual: EPIC 249624646

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