Bibcode
Nowak, G.; Palle, E.; Gandolfi, Davide; Dai, Fei; Lanza, Antonino F.; Hirano, Teruyuki; Barragán, Oscar; Fukui, Akihiko; Bruntt, Hans; Endl, Michael; Cochran, William D.; Prada Moroni, Pier G.; Prieto-Arranz, J.; Kiilerich, Amanda; Nespral, D.; Hatzes, Artie P.; Albrecht, Simon; Deeg, H. J.; Winn, Joshua N.; Yu, Liang; Kuzuhara, Masayuki; Grziwa, Sascha; Smith, Alexis M. S.; Guenther, Eike W.; Van Eylen, Vincent; Csizmadia, Szilard; Fridlund, Malcolm; Cabrera, Juan; Eigmüller, Philipp; Erikson, Anders; Korth, Judith; Narita, Norio; Pätzold, Martin; Rauer, Heike; Ribas, Ignasi
Referencia bibliográfica
The Astronomical Journal, Volume 153, Issue 3, article id. 131, 11 pp. (2017).
Fecha de publicación:
3
2017
Número de citas
39
Número de citas referidas
39
Descripción
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 M ⊙, radius
{R}\star =1.01+/- 0.03 R ⊙, 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.
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Enric
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