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Greening of the brown-dwarf desert. EPIC 212036875b: a 51 MJ object in a 5-day orbit around an F7 V star

Persson, C.M. and Csizmadia, Szilard and Mustill, A.J. and Fridlund, M. and Hatzes, A.P. and Nowak, G. and Georgieva, I. and Gandolfi, D. and Davies, M.B. and Livingston, J.H. and Palle, E. and Montañes Rodríguez, P. and Endl, M. and Hirano, T. and Prieto-Arranz, J. and Korth, J. and Grziwa, S. and Esposito, M. and Albrecht, S. and Johnson, M.C. and Barragán, O. and Parviainen, H. and Van Eylen, V. and Alonso Sobrino, R. and Beck, P.G. and Cabrera Perez, Juan and Carleo, I. and Cochran, W.D. and Dai, F. and Deeg, H.J. and de Leon, J.P. and Eigmüller, Philipp and Erikson, A and Fukui, A. and González-Cuesta, L. and Guenther, E.W. and Hidalgo, D. and Hjorth, M. and Kabath, P. and Knudstrup, E. and Kusakabe, N. and Lam, K.W.F. and Lund, M.N. and Luque, R. and Mathur, S. and Murgas, F. and Narita, N. and Nespral, D. and Niraula, P. and Olofsson, A.O.H. and Pätzold, M. and Rauer, H and Redfield, S. and Ribas, I. and Skarka, M. and Smith, Alexis and Subjak, J. and Tamura, M. (2019) Greening of the brown-dwarf desert. EPIC 212036875b: a 51 MJ object in a 5-day orbit around an F7 V star. Astronomy & Astrophysics, 628, A64. EDP Sciences. DOI: 10.1051/0004-6361/201935505 ISSN 0004-6361

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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 F7 V star EPIC 212036875. We find a stellar mass of 1.15 &#177; 0.08 M&sun;, a stellar radius of 1.41 &#177; 0.05 R&sun;, and an age of 5.1 &#177; 0.9 Gyr. The mass and radius of the companion brown dwarf are 51 &#177; 2 MJ and 0.83 &#177; 0.03 RJ, 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 0.3 MJ to the turn-over to hydrogen burning stars at 73 MJ. 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*' &gsim; 108), which implies a circularisation timescale of &gsim;23 Gyr, or suggests an interaction between the magnetic and tidal forces of the star and the brown dwarf. Table 2 is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/628/A64">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/628/A64This work is done under the framework of the KESPRINT collaboration (<A href="http://kesprint.science">http://kesprint.science). KESPRINT is an international consortium devoted to the characterisation and research of exoplanets discovered with space-based missions. Associated Articles Source&#160;Paper&#160;&#160;&#160;&#160; Catalog&#160;Description&#160;&#160;&#160;&#160;

Item URL in elib:https://elib.dlr.de/129157/
Document Type:Article
Title:Greening of the brown-dwarf desert. EPIC 212036875b: a 51 MJ object in a 5-day orbit around an F7 V star
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Persson, C.M.Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, Sweden. );Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, OnsalUNSPECIFIED
Csizmadia, Szilardszilard.csizmadia (at) dlr.deUNSPECIFIED
Mustill, A.J.Lund Observatory, Department of Astronomy &#38; Theoretical Physics, Lund University, Box 43, SE-221 00, Lund, SwedenUNSPECIFIED
Fridlund, M.Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, Sweden; Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA, Leiden, The NetherlandsUNSPECIFIED
Hatzes, A.P.Thuringer Landessternwarte Tautenburg, 07778, Tautenburg, GermanyUNSPECIFIED
Nowak, G.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Georgieva, I.Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, SwedenUNSPECIFIED
Gandolfi, D.Dipartimento di Fisica, Universita di Torino, Via Pietro Giuria 1, 10125, Torino, ItalyUNSPECIFIED
Davies, M.B.Lund Observatory, Department of Astronomy &#38; Theoretical Physics, Lund University, Box 43, SE-221 00, Lund, SwedenUNSPECIFIED
Livingston, J.H.Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, JapanUNSPECIFIED
Palle, E.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Montañes Rodríguez, P.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Endl, M.Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Austin, TX, 78712, USAUNSPECIFIED
Hirano, T.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokio, JapanUNSPECIFIED
Prieto-Arranz, J.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Korth, J.Rheinisches Institut fur Umweltforschung an der Universitat zu Koln, Aachener Strasse 209, 50931, Koln, GermanyUNSPECIFIED
Grziwa, S.Rheinisches Institut fur Umweltforschung an der Universitat zu Koln, Aachener Strasse 209, 50931, Koln, GermanyUNSPECIFIED
Esposito, M.Thuringer Landessternwarte Tautenburg, 07778, Tautenburg, GermanyUNSPECIFIED
Albrecht, S.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000, Aarhus C, DenmarkUNSPECIFIED
Johnson, M.C.Department of Astronomy, The Ohio State University, 140 West 18th Ave., Columbus, OH, 43210, USAUNSPECIFIED
Barragán, O.Dipartimento di Fisica, Universita di Torino, Via Pietro Giuria 1, 10125, Torino, Italy; Sub-department of Astrophysics, Department of Physics, University of Oxford, Oxford, OX1 3RH, UKUNSPECIFIED
Parviainen, H.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Van Eylen, V.Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ, 08544, USAUNSPECIFIED
Alonso Sobrino, R.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Beck, P.G.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain; Institute fur Physik, Geophysik, Astrophysik und Meteorologie, Karl-Franzens UniversitUNSPECIFIED
Cabrera Perez, JuanJuan.Cabrera (at) dlr.dehttps://orcid.org/0000-0001-6653-5487
Carleo, I.Astronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT, 06459, USAUNSPECIFIED
Cochran, W.D.Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Austin, TX, 78712, USAUNSPECIFIED
Dai, F.Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ, 08544, USA; Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, MA, 02139, USAUNSPECIFIED
Deeg, H.J.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
de Leon, J.P.Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, JapanUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Erikson, Aanders.erikson (at) dlr.deUNSPECIFIED
Fukui, A.National Astronomical Observatory of Japan, NINS, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, JapanUNSPECIFIED
González-Cuesta, L.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Guenther, E.W.Thuringer Landessternwarte Tautenburg, 07778, Tautenburg, GermanyUNSPECIFIED
Hidalgo, D.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Hjorth, M.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000, Aarhus C, DenmarkUNSPECIFIED
Kabath, P.Astronomical Institute, Czech Academy of Sciences, Fricova 298, 25165, Ondrejov, Czech RepublicUNSPECIFIED
Knudstrup, E.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000, Aarhus C, DenmarkUNSPECIFIED
Kusakabe, N.National Astronomical Observatory of Japan, NINS, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan; Astrobiology Center, NINS, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, JapanUNSPECIFIED
Lam, K.W.F.Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, 10623, Berlin, GermanyUNSPECIFIED
Lund, M.N.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000, Aarhus C, DenmarkUNSPECIFIED
Luque, R.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Mathur, S.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Murgas, F.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Narita, N.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan; National Astronomical Observatory of Japan, NINS, 2-21-1 Osawa, Mitaka, Tokyo,UNSPECIFIED
Nespral, D.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Niraula, P.Department of Earth, Atmospheric and Planetary Sciences, MIT, 77 Massachusetts Avenue, Cambridge, MA, 02139, USAUNSPECIFIED
Olofsson, A.O.H.Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, SwedenUNSPECIFIED
Pätzold, M.Rheinisches Institut fur Umweltforschung an der Universitat zu Koln, Aachener Strasse 209, 50931, Koln, GermanyUNSPECIFIED
Rauer, Hheike.rauer (at) dlr.deUNSPECIFIED
Redfield, S.Astronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT, 06459, USAUNSPECIFIED
Ribas, I.Institut de Ciencies de l'Espai (ICE, CSIC), Campus UAB,C/ de Can Magrans s/n, 08193, Bellaterra, Spain; Institut d'Estudis Espacials de Catalunya (IEEC), C/ Gran Capita 2-4, 08034, Barcelona, SpainUNSPECIFIED
Skarka, M.Astronomical Institute, Czech Academy of Sciences, Fricova 298, 25165, Ondrejov, Czech Republic; Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlarska 2, 61137, Brno, Czech RepublicUNSPECIFIED
Smith, AlexisAlexis.Smith (at) dlr.deUNSPECIFIED
Subjak, J.Astronomical Institute, Czech Academy of Sciences, Fricova 298, 25165, Ondrejov, Czech Republic; Astronomical Institute, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 2027/3, 12116, Prague, Czech RepublicUNSPECIFIED
Tamura, M.Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan; National Astronomical Observatory of Japan, NINS, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan; Astrobiology Center, NINS, 2-21-1 Osawa, Mitaka, Tokyo, 181-8UNSPECIFIED
Date:2019
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:628
DOI :10.1051/0004-6361/201935505
Page Range:A64
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:planetary systems, stars: fundamental parameters, stars: individual: EPIC 212036875, techniques: photometric, techniques: radial velocities
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt COROT Beteiligung
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Smith, Alexis
Deposited On:30 Sep 2019 14:08
Last Modified:30 Sep 2019 14:08

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