Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

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

Nowak, Grzegorz ; Palle, Enric ; Gandolfi, Davide ; Dai, Fei ; Lanza, Antonino F. ; Hirano, Teruyuki ; Barragán, Oscar ; Fukui, Akihiko ; Bruntt, Hans and Endl, Michael , et al. (2017) In Astronomical Journal 153(3).
Abstract

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 Rb= 0.937 ± 0.032 RJup and mass of Mb = 36.84 ± 0.97 MJup , yielding a mean density of 59.6 ± 7.6 g cm-3. The host star is nearly a solar twin with mass M = 1.01 ± 0.04 Me, radius R = 1.01 ± 0.03 Re, effective temperature Teff=5850 ± 85 K, and iron abundance [Fe/H] = 0.03 ± 0.08 dex. Its age, spectroscopic distance,... (More)

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 Rb= 0.937 ± 0.032 RJup and mass of Mb = 36.84 ± 0.97 MJup , yielding a mean density of 59.6 ± 7.6 g cm-3. The host star is nearly a solar twin with mass M = 1.01 ± 0.04 Me, radius R = 1.01 ± 0.03 Re, effective temperature Teff=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.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and , et al. (More)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; and (Less)
publishing date
type
Contribution to journal
publication status
published
keywords
brown dwarfs, stars: individual (EPIC 219388192), techniques: photometric, techniques: radial velocities, techniques: spectroscopic
in
Astronomical Journal
volume
153
issue
3
article number
131
publisher
IOP Publishing
external identifiers
  • scopus:85015213813
ISSN
0004-6256
DOI
10.3847/1538-3881/aa5cb6
language
English
LU publication?
no
additional info
Publisher Copyright: © 2017 Published by Elsevier B.V.
id
23e4e64c-ce34-45b1-9e17-af135dca2876
date added to LUP
2023-02-03 09:28:41
date last changed
2023-02-20 16:19:55
@article{23e4e64c-ce34-45b1-9e17-af135dca2876,
  abstract     = {{<p>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<sub>b</sub>= 0.937 ± 0.032 R<sub>Jup</sub> and mass of M<sub>b</sub> = 36.84 ± 0.97 M<sub>Jup</sub> , yielding a mean density of 59.6 ± 7.6 g cm<sup>-3</sup>. The host star is nearly a solar twin with mass M = 1.01 ± 0.04 M<sub>e</sub>, radius R = 1.01 ± 0.03 Re, effective temperature T<sub>eff</sub>=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.</p>}},
  author       = {{Nowak, Grzegorz and Palle, Enric and Gandolfi, Davide and Dai, Fei and Lanza, Antonino F. and Hirano, Teruyuki and Barragán, Oscar and Fukui, Akihiko and Bruntt, Hans and Endl, Michael and Cochran, William D. and Moroni, Pier G.Prada and Prieto-Arranz, Jorge and Kiilerich, Amanda and Nespral, David and Hatzes, Artie P. and Albrecht, Simon and Deeg, Hans and Winn, Joshua N. and Yu, Liang and Kuzuhara, Masayuki and Grziwa, Sascha and Smith, Alexis M.S. and Guenther, Eike W. and Eylen, Vincent Van and Csizmadia, Szilard and Fridlund, Malcolm and Cabrera, Juan and Eigmüller, Philipp and Erikson, Anders and Korth, Judith and Narita, Norio and Pätzold, Martin and Rauer, Heike and Ribas, Ignasi}},
  issn         = {{0004-6256}},
  keywords     = {{brown dwarfs; stars: individual (EPIC 219388192); techniques: photometric; techniques: radial velocities; techniques: spectroscopic}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{IOP Publishing}},
  series       = {{Astronomical Journal}},
  title        = {{EPIC 219388192b - An Inhabitant of the Brown Dwarf Desert in the Ruprecht 147 Open Cluster}},
  url          = {{http://dx.doi.org/10.3847/1538-3881/aa5cb6}},
  doi          = {{10.3847/1538-3881/aa5cb6}},
  volume       = {{153}},
  year         = {{2017}},
}