干旱区生态环境知识资源中心(Arid): Greening of the brown-dwarf desert EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star

Arid

DOI	10.1051/0004-6361/201935505
	Greening of the brown-dwarf desert EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star
	Persson, Carina M.1; Csizmadia, Szilard 2; Mustill, Alexander J.3; Fridlund, Malcolm 1,4; Hatzes, Artie P.5; Nowak, Grzegorz 6,7; Georgieva, Iskra 1; Gandolfi, Davide 8; Davies, Melvyn B.3; Livingston, John H.9; Palle, Enric 6,7; Montanes Rodriguez, Pilar 6,7; Endl, Michael 10,11; Hirano, Teruyuki 12; Prieto-Arranz, Jorge 6,7; Korth, Judith 13; Grziwa, Sascha 13; Esposito, Massimiliano 5; Albrecht, Simon 14; Johnson, Marshall C.15; Barragan, Oscar 8,16; Parviainen, Hannu 6,7; Van Eylen, Vincent 17; Alonso Sobrino, Roi 6,7; Beck, Paul G.6,7,18; Cabrera, Juan 2; Carleo, Ilaria 19,20; Cochran, William D.10,11; Dai, Fei 17,21,22; Deeg, Hans J.6,7; de Leon, Jerome P.9; Eigmueller, Philipp 2; Erikson, Anders 2; Fukui, Akai 23; Gonzalez-Cuesta, Lucia 6,7; Guenther, Eike W.5; Hidalgo, Diego 6,7; Hjorth, Maria 14; Kabath, Petr 24; Knudstrup, Emil 14; Kusakabe, Nobuhiko 23,25; Lam, Kristine W. F.26; Lund, Mikkel N.14; Luque, Rafael 6,7; Mathur, Savita 6,7; Murgas, Felipe 6,7; Narita, Norio 6,9,23,25,27; Nespral, David 6,7; Niraula, Prajwal 28; Olofsson, A. O. Henrik 1; Paetzold, Martin 13; Rauer, Heike 2,26; Redfield, Seth 19,20; Ribas, Ignasi 29,30; Skarka, Marek 24,31; Smith, Alexis M. S.2; Subjak, Jan 24,32; Tamura, Motohide 9,23,25
通讯作者	Persson, Carina M.
来源期刊	ASTRONOMY & ASTROPHYSICS
ISSN	1432-0746
出版年	2019
卷号	628
英文摘要	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.
英文关键词	planetary systems stars: fundamental parameters stars: individual: EPIC 212036875 techniques: photometric techniques: radial velocities
类型	Article
语种	英语
国家	Sweden ; Germany ; Netherlands ; Spain ; Italy ; Japan ; USA ; Denmark ; England ; Austria ; Czech Republic
开放获取类型	Green Submitted, Bronze
收录类别	SCI-E
WOS记录号	WOS:000480314000002
WOS关键词	TRANSITING EXTRASOLAR PLANETS ; DOPPLER FOLLOW-UP ; TIDAL EVOLUTION ; GIANT PLANETS ; RADIAL-VELOCITY ; MINI-NEPTUNE ; WARM JUPITER ; HOT JUPITER ; MASS ; DISSIPATION
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
来源机构	University of Oxford
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214430
作者单位	1.Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, SE-43992 Onsala, Sweden; 2.German Aerosp Ctr DLR, Inst Planetary Res, Rutherfordstr 2, D-12489 Berlin, Germany; 3.Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, SE-22100 Lund, Sweden; 4.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands; 5.Thuringer Landessternwarte Tautenburg, D-07778 Tautenburg, Germany; 6.Inst Astrofis Canarias, Tenerife 38205, Spain; 7.Univ La Laguna, Dept Astrofis, Tenerife, Spain; 8.Univ Torino, Dipartimento Fis, Via Pietro Giuria 1, I-10125 Turin, Italy; 9.Univ Tokyo, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan; 10.Univ Texas Austin, Dept Astron, 2515 Speedway, Austin, TX 78712 USA; 11.Univ Texas Austin, McDonald Observ, 2515 Speedway, Austin, TX 78712 USA; 12.Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro Ku, 2-12-1 Ookayama, Tokyo, Japan; 13.Univ Cologne, Rhein Inst Umweltforsch, Aachener Str 209, D-50931 Cologne, Germany; 14.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark; 15.Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA; 16.Univ Oxford, Subdept Astrophys, Dept Phys, Oxford OX1 3RH, England; 17.Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08544 USA; 18.Karl Franzens Univ Graz, Inst Phys Geophys Astrophys & Meteorol, Univ Pl 5, A-8010 Graz, Austria; 19.Wesleyan Univ, Dept Astron, Middletown, CT 06459 USA; 20.Wesleyan Univ, Van Vleck Observ, Middletown, CT 06459 USA; 21.MIT, Dept Phys, Cambridge, MA 02139 USA; 22.MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA; 23.NINS, Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan; 24.Czech Acad Sci, Astron Inst, Fricova 298, Ondrejov 25165, Czech Republic; 25.NINS, Astrobiol Ctr, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan; 26.TU Berlin, Ctr Astron & Astrophys, Hardenbergstr 36, D-10623 Berlin, Germany; 27.JST, PRESTO, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan; 28.MIT, Dept Earth Atmospher & Planetary Sci, 77 Massachusetts Ave, Cambridge, MA 02139 USA; 29.CSIC, ICE, Campus UAB,C Can Magrans S-N, Bellaterra 08193, Spain; 30.IEEC, C Gran Capita 2-4, Barcelona 08034, Spain; 31.Masaryk Univ, Dept Theoret Phys & Astrophys, Kotlarska 2, Brno 61137, Czech Republic; 32.Charles Univ Prague, Fac Math & Phys, Astron Inst, Ke Karlovu 2027-3, Prague 12116, Czech Republic
推荐引用方式 GB/T 7714	Persson, Carina M.,Csizmadia, Szilard,Mustill, Alexander J.,et al. Greening of the brown-dwarf desert EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star[J]. University of Oxford,2019,628.
APA	Persson, Carina M..,Csizmadia, Szilard.,Mustill, Alexander J..,Fridlund, Malcolm.,Hatzes, Artie P..,...&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.ASTRONOMY & ASTROPHYSICS,628.
MLA	Persson, Carina M.,et al."Greening of the brown-dwarf desert EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star".ASTRONOMY & ASTROPHYSICS 628(2019).