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EPIC 219388192b-An Inhabitant of the Brown Dwarf Desert in the Ruprecht 147 Open Cluster

Nowak, G. (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Palle, E. (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Gandolfi, D. (author)
Universita degli Studi di Torino,University of Turin
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Dai, F. (author)
Massachusetts Institute of Technology (MIT)
Lanza, A. F. (author)
Istituto nazionale di astrofisica (INAF)
Hirano, T. (author)
Tokyo Institute of Technology
Barragán, O. (author)
Universita degli Studi di Torino,University of Turin
Fukui, A. (author)
National Astronomical Observatory of Japan
Bruntt, H. (author)
Århus Universitet,Aarhus University
Endl, M. (author)
The University of Texas at Austin, USA
Cochran, W. D. (author)
The University of Texas at Austin, USA
Moroni, P. G. P. (author)
Universita di Pisa,University of Pisa,Istituto Nazionale di Fisica Nucleare,National Institute for Nuclear Physics
Prieto-Arranz, J. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Kiilerich, A. (author)
Århus Universitet,Aarhus University
Nespral, D. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Hatzes, A. (author)
Thüringer Landessternwarte Tautenburg
Albrecht, S. (author)
Århus Universitet,Aarhus University
Deeg, H. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Winn, J. N. (author)
Princeton University
Yu, L. (author)
Massachusetts Institute of Technology (MIT)
Kuzuhara, M. (author)
National Astronomical Observatory of Japan,National Institutes of Natural Sciences (NINS)
Grziwa, S. (author)
Universität zu Köln,University of Cologne
Smith, A. M. S. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Guenther, E. W. (author)
Thüringer Landessternwarte Tautenburg
Van Eylen, V. (author)
Universiteit Leiden (UL),Leiden University (UL)
Csizmadia, S. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Fridlund, Malcolm, 1952 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Cabrera, J. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Eigmüller, Philipp (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Erikson, A. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Korth, J. (author)
Universität zu Köln,University of Cologne
Narita, N. (author)
University of Tokyo, Japan,National Institutes of Natural Sciences (NINS),National Astronomical Observatory of Japan
Patzold, M. (author)
Universität zu Köln,University of Cologne
Rauer, H. (author)
Technische Universität Berlin,Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Ribas, I. (author)
Universitat Autonoma de Barcelona (UAB)
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 (creator_code:org_t)
2017-02-27
2017
English.
In: Astronomical Journal. - : American Astronomical Society. - 1538-3881 .- 0004-6256. ; 153:3
Related links:
http://dx.doi.org/10...
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https://dspace.mit.e...
https://research.cha...
https://doi.org/10.3...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We report the discovery of EPIC 219388192b, a transiting brown dwarf in a 5.3 day orbit around a member star of Ruprecht 147, the oldest nearby open cluster association, which was photometrically monitored by K2 during its Campaign 7. We combine the K2 time-series data with ground-based adaptive optics imaging and high-resolution spectroscopy to rule out false positive scenarios and determine the main parameters of the system. EPIC 219388192b has a radius of R-b= 0.937 +/- 0.032 R-Jup and mass of M-b= 36.84 +/- 0.97 M-Jup, yielding a mean density of 59.6 +/- 7.6 g cm(- 3). The host star is nearly a solar twin with mass M-star = 1.01 +/- 0.04 Me, radius R-star = 1.01 +/- 0.03 R-circle dot, effective temperature T-eff = 5850 +/- 85 K, and iron abundance [Fe/ H]. = 0.03 +/- 0.08 dex. Its age, spectroscopic distance, and reddening are consistent with those of Ruprecht 147, corroborating its cluster membership. EPIC 219388192b is the first mature brown dwarf with precise determinations of mass, radius, and age, and serves as benchmark for evolutionary models in the substellar regime.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

photometric
stars : individual (EPIC 219388192)
techniques : spectroscopic
techniques : radial velocities
techniques : photometric
brown dwarfs

Publication and Content Type

art (subject category)
ref (subject category)

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