Persson, Carina M., Csizmadia, Szilard, Mustill, Alexander J., Fridlund, Malcolm ORCID: 0000-0002-0855-8426, Hatzes, Artie P., Nowak, Grzegorz, Georgieva, Iskra, Gandolfi, Davide, Davies, Melvyn B., Livingston, John H., Palle, Enric, Montanes Rodriguez, Pilar, Endl, Michael, Hirano, Teruyuki, Prieto-Arranz, Jorge, Korth, Judith, Grziwa, Sascha, Esposito, Massimiliano, Albrecht, Simon, Johnson, Marshall C., Barragan, Oscar ORCID: 0000-0003-0563-0493, Parviainen, Hannu, Van Eylen, Vincent ORCID: 0000-0001-5542-8870, Alonso Sobrino, Roi, Beck, Paul G., Cabrera, Juan, Carleo, Ilaria, Cochran, William D., Dai, Fei, Deeg, Hans J., de Leon, Jerome P., Eigmueller, Philipp, Erikson, Anders, Fukui, Akai, Gonzalez-Cuesta, Lucia, Guenther, Eike W., Hidalgo, Diego, Hjorth, Maria, Kabath, Petr, Knudstrup, Emil ORCID: 0000-0001-7880-594X, Kusakabe, Nobuhiko, Lam, Kristine W. F., Lund, Mikkel N., Luque, Rafael, Mathur, Savita, Murgas, Felipe, Narita, Norio, Nespral, David, Niraula, Prajwal, Olofsson, A. O. Henrik, Paetzold, Martin, Rauer, Heike, Redfield, Seth, Ribas, Ignasi ORCID: 0000-0002-6689-0312, Skarka, Marek, Smith, Alexis M. S., Subjak, Jan and Tamura, Motohide (2019). Greening of the brown-dwarf desert EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star. Astron. Astrophys., 628. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. Although more than 2000 brown dwarfs have been detected to date, mainly from direct imaging, their characterisation is difficult due to their faintness and model-dependent results. In the case of transiting brown dwarfs, however, it is possible to make direct high-precision observations. Aims. Our aim is to investigate the nature and formation of brown dwarfs by adding a new well-characterised object, in terms of its mass, radius and bulk density, to the currently small sample of less than 20 transiting brown dwarfs. Methods. One brown dwarf candidate was found by the KESPRINT consortium when searching for exoplanets in the K2 space mission Campaign 16 field. We combined the K2 photometric data with a series of multicolour photometric observations, imaging, and radial velocity measurements to rule out false positive scenarios and to determine the fundamental properties of the system. Results. We report the discovery and characterisation of a transiting brown dwarf in a 5.17-day eccentric orbit around the slightly evolved F7V star EPIC 212036875. We find a stellar mass of 1.15 +/- 0.08 M-circle dot, a stellar radius of 1.41 +/- 0.05 R-circle dot, and an age of 5.1 +/- 0.9 Gyr. The mass and radius of the companion brown dwarf are 51 +/- 2 M-J and 0.83 +/- 0.03 R-J, respectively, corresponding to a mean density of 108(-13)(+15) g cm(-3). Conclusions. EPIC 212036875 b is a rare object that resides in the brown-dwarf desert. In the mass-density diagram for planets, brown dwarfs, and stars, we find that all giant planets and brown dwarfs follow the same trend from similar to 0.3 M-J to the turn-over to hydrogen burning stars at similar to 73 M-J. EPIC 212036875 b falls close to the theoretical model for mature H/He dominated objects in this diagram as determined by interior structure models. We argue that EPIC 212036875 b formed via gravitational disc instabilities in the outer part of the disc, followed by a quick migration. Orbital tidal circularisation may have started early in its history for a brief period when the brown dwarf's radius was larger. The lack of spin-orbit synchronisation points to a weak stellar dissipation parameter (Q(star)' greater than or similar to 10(8)), which implies a circularisation timescale of greater than or similar to 23 Gyr, or suggests an interaction between the magnetic and tidal forces of the star and the brown dwarf.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Persson, Carina M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csizmadia, SzilardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mustill, Alexander J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fridlund, MalcolmUNSPECIFIEDorcid.org/0000-0002-0855-8426UNSPECIFIED
Hatzes, Artie P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nowak, GrzegorzUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Georgieva, IskraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gandolfi, DavideUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Davies, Melvyn B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Livingston, John H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Palle, EnricUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Montanes Rodriguez, PilarUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Endl, MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hirano, TeruyukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Prieto-Arranz, JorgeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Korth, JudithUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grziwa, SaschaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Esposito, MassimilianoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Albrecht, SimonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Johnson, Marshall C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barragan, OscarUNSPECIFIEDorcid.org/0000-0003-0563-0493UNSPECIFIED
Parviainen, HannuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Van Eylen, VincentUNSPECIFIEDorcid.org/0000-0001-5542-8870UNSPECIFIED
Alonso Sobrino, RoiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beck, Paul G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cabrera, JuanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Carleo, IlariaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cochran, William D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dai, FeiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deeg, Hans J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Leon, Jerome P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eigmueller, PhilippUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erikson, AndersUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fukui, AkaiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gonzalez-Cuesta, LuciaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guenther, Eike W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hidalgo, DiegoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hjorth, MariaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kabath, PetrUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Knudstrup, EmilUNSPECIFIEDorcid.org/0000-0001-7880-594XUNSPECIFIED
Kusakabe, NobuhikoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lam, Kristine W. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lund, Mikkel N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Luque, RafaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mathur, SavitaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Murgas, FelipeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Narita, NorioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nespral, DavidUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Niraula, PrajwalUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Olofsson, A. O. HenrikUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paetzold, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rauer, HeikeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Redfield, SethUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ribas, IgnasiUNSPECIFIEDorcid.org/0000-0002-6689-0312UNSPECIFIED
Skarka, MarekUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Smith, Alexis M. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Subjak, JanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tamura, MotohideUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-144598
DOI: 10.1051/0004-6361/201935505
Journal or Publication Title: Astron. Astrophys.
Volume: 628
Date: 2019
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
TRANSITING EXTRASOLAR PLANETS; DOPPLER FOLLOW-UP; TIDAL EVOLUTION; GIANT PLANETS; RADIAL-VELOCITY; MINI-NEPTUNE; WARM JUPITER; HOT JUPITER; MASS; DISSIPATIONMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/14459

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