EPIC 219388192b-An Inhabitant of the Brown Dwarf Desert in the Ruprecht 147 Open Cluster
Artikel i vetenskaplig tidskrift, 2017
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.
photometric
stars : individual (EPIC 219388192)
techniques : spectroscopic
techniques : radial velocities
techniques : photometric
brown dwarfs
Författare
G. Nowak
Universidad de la Laguna
Instituto de Astrofísica de Canarias
E. Palle
Universidad de la Laguna
Instituto de Astrofísica de Canarias
D. Gandolfi
Landessternwarte Heidelberg-Königstuhl
Universita degli Studi di Torino
F. Dai
Massachusetts Institute of Technology (MIT)
A. F. Lanza
Istituto nazionale di astrofisica (INAF)
T. Hirano
Tokyo Institute of Technology
O. Barragán
Universita degli Studi di Torino
A. Fukui
National Astronomical Observatory of Japan
H. Bruntt
Aarhus Universitet
M. Endl
The University of Texas at Austin
W. D. Cochran
The University of Texas at Austin
P. G. P. Moroni
Universita di Pisa
Istituto Nazionale di Fisica Nucleare
J. Prieto-Arranz
Instituto de Astrofísica de Canarias
Universidad de la Laguna
A. Kiilerich
Aarhus Universitet
D. Nespral
Instituto de Astrofísica de Canarias
Universidad de la Laguna
A. Hatzes
Thüringer Landessternwarte Tautenburg
S. Albrecht
Aarhus Universitet
H. Deeg
Instituto de Astrofísica de Canarias
Universidad de la Laguna
J. N. Winn
Princeton University
L. Yu
Massachusetts Institute of Technology (MIT)
M. Kuzuhara
National Astronomical Observatory of Japan
National Institutes of Natural Sciences
S. Grziwa
Universität zu Köln
A. M. S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
E. W. Guenther
Thüringer Landessternwarte Tautenburg
V. Van Eylen
Universiteit Leiden
S. Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Malcolm Fridlund
Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Philipp Eigmüller
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
A. Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
J. Korth
Universität zu Köln
N. Narita
University of Tokyo
National Institutes of Natural Sciences
National Astronomical Observatory of Japan
M. Patzold
Universität zu Köln
H. Rauer
Technische Universität Berlin
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
I. Ribas
Universitat Autonoma de Barcelona (UAB)
Astronomical Journal
0004-6256 (ISSN) 1538-3881 (eISSN)
Vol. 153 3 131Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.3847/1538-3881/aa5cb6