Nowak, Grzegorz ORCID: 0000-0002-7031-7754, Palle, Enric, Gandolfi, Davide ORCID: 0000-0001-8627-9628, Dai, Fei, Lanza, Antonino F., Hirano, Teruyuki, Barragan, Oscar ORCID: 0000-0003-0563-0493, Fukui, Akihiko ORCID: 0000-0002-4909-5763, Bruntt, Hans, Endl, Michael, Cochran, William D., Moroni, Pier G. Prada, Prieto-Arranz, Jorge, Kiilerich, Amanda, Nespral, David, Hatzes, Artie P., Albrecht, Simon, Deeg, Hans ORCID: 0000-0003-0047-4241, Winn, Joshua N., Yu, Liang, Kuzuhara, Masayuki, Grziwa, Sascha, Smith, Alexis M. S., Guenther, Eike W., Van Eylen, Vincent ORCID: 0000-0001-5542-8870, Csizmadia, Szilard, Fridlund, Malcolm ORCID: 0000-0002-0855-8426, Cabrera, Juan ORCID: 0000-0001-6653-5487, Eigmueller, Philipp, Erikson, Anders, Korth, Judith ORCID: 0000-0002-0076-6239, Narita, Norio, Paetzold, Martin, Rauer, Heike and Ribas, Ignasi ORCID: 0000-0002-6689-0312 (2017). EPIC 219388192b-An Inhabitant of the Brown Dwarf Desert in the Ruprecht 147 Open Cluster. Astron. J., 153 (3). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-3881

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Abstract

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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Nowak, GrzegorzUNSPECIFIEDorcid.org/0000-0002-7031-7754UNSPECIFIED
Palle, EnricUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gandolfi, DavideUNSPECIFIEDorcid.org/0000-0001-8627-9628UNSPECIFIED
Dai, FeiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lanza, Antonino F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hirano, TeruyukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barragan, OscarUNSPECIFIEDorcid.org/0000-0003-0563-0493UNSPECIFIED
Fukui, AkihikoUNSPECIFIEDorcid.org/0000-0002-4909-5763UNSPECIFIED
Bruntt, HansUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Endl, MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cochran, William D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moroni, Pier G. PradaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Prieto-Arranz, JorgeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kiilerich, AmandaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nespral, DavidUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hatzes, Artie P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Albrecht, SimonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deeg, HansUNSPECIFIEDorcid.org/0000-0003-0047-4241UNSPECIFIED
Winn, Joshua N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yu, LiangUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kuzuhara, MasayukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grziwa, SaschaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Smith, Alexis M. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guenther, Eike W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Van Eylen, VincentUNSPECIFIEDorcid.org/0000-0001-5542-8870UNSPECIFIED
Csizmadia, SzilardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fridlund, MalcolmUNSPECIFIEDorcid.org/0000-0002-0855-8426UNSPECIFIED
Cabrera, JuanUNSPECIFIEDorcid.org/0000-0001-6653-5487UNSPECIFIED
Eigmueller, PhilippUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erikson, AndersUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Korth, JudithUNSPECIFIEDorcid.org/0000-0002-0076-6239UNSPECIFIED
Narita, NorioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paetzold, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rauer, HeikeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ribas, IgnasiUNSPECIFIEDorcid.org/0000-0002-6689-0312UNSPECIFIED
URN: urn:nbn:de:hbz:38-238434
DOI: 10.3847/1538-3881/aa5cb6
Journal or Publication Title: Astron. J.
Volume: 153
Number: 3
Date: 2017
Publisher: IOP PUBLISHING LTD
Place of Publication: BRISTOL
ISSN: 1538-3881
Language: English
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Externe Einrichtungen > An-Institute > Associated Institutes of the Faculty of Mathematics and Natural Sciences > Rhenish Institute for Environmental Research - RIU
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
EXTRASOLAR GIANT PLANETS; TRANSITING EXOPLANETS; EVOLUTIONARY MODELS; ECLIPSING BINARIES; SOPHIE VELOCIMETRY; TIDAL DISSIPATION; MASS STARS; T DWARFS; KEPLER; ATMOSPHERESMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/23843

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