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TOI-503: The First Known Brown-dwarf Am-star Binary from the TESS Mission

Subjak, J. and Sharma, R. and Carmichael, T.W. and Johnson, M. C. and Gonzales, E.J. and Matthews, E. and Boffin, H. M. J. and Brahm, R. and Chaturvedi, P. and Chakraborty, A. and Ciardi, D.R. and Collins, K. A. and Esposito, M. and Fridlund, M. and Gan, T. and Gandolfi, D. and Garcia, R.A. and Guenther, E. and Hatzes, A. and Latham, D.W. and Mathis, S. and Persson, C. M. and Relles, H. and Schlieder, Joshua E. and Barclay, T. and Dressing, C.D. and Crossfield, Ian J.M. and Howard, A. W. and Rodler, F. and Zhou, G. and Quinn, Samuel N. and Esquerdo, G. A. and Calkins, M. L. and Berlind, P. and Stassun, Keivan G. and Blazek, M. and Skarka, M. and Spokova, M. and Zak, J and Albrecht, S. and Sobrino, Alonso and Beck, P. and Cabrera Perez, Juan and Carleo, I. and Cochran, W. D. and Csizmadia, Szilard and Fei, D and Deeg, H. and De Leon, J. and Eigmüller, Philipp and Endl, M and Erikson, A and Fukui, A. and Georgieva, I. and Gonzalez-Cuesta, Lucia and Grziwa, S. and Hidalgo, D. and Hirano, T. and Hjorth, Maria and Knudstrup, E. and Korth, J. and Lam, K. W. F. and Livingston, J. and Lund, M. N. and Luque, R. and Rodriguez, P.M. and Murgas, F. and Narita, N. and Nespral, D. and Niraula, P. and Nowak, G. and Palle, E. and Patzold, M and Prieto-Arranz, J. and Rauer, H and Redfield, Seth and Ribas, I. and Smith, A M S and Van Eylen, V. and Kabath, P. (2020) TOI-503: The First Known Brown-dwarf Am-star Binary from the TESS Mission. Astronomical Journal, 159 (4), p. 151. American Astronomical Society. doi: 10.3847/1538-3881/ab7245. ISSN 0004-6256.

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Official URL: https://iopscience.iop.org/article/10.3847/1538-3881/ab7245

Abstract

We report the discovery of an intermediate-mass transiting brown dwarf (BD), TOI-503b, from the TESS mission. TOI-503b is the first BD discovered by TESS, and it has circular orbit around a metallic-line A-type star with a period of P = 3.6772 ± 0.0001 days. The light curve from TESS indicates that TOI-503b transits its host star in a grazing manner, which limits the precision with which we measure the BD's radius ( ${R}_{b}={1.34}_{-0.15}^{+0.26}{R}_{{\rm{J}}} ). We obtained high-resolution spectroscopic observations with the FIES, Ondřejov, PARAS, Tautenburg, and TRES spectrographs, and measured the mass of TOI-503b to be Mb = 53.7 ± 1.2 ${M}_{{\rm{J}}} . The host star has a mass of M⋆ = 1.80 ± 0.06 M☉, a radius of R⋆ = 1.70 ± 0.05R☉, an effective temperature of Teff = 7650 ± 160 K, and a relatively high metallicity of 0.61 ± 0.07 dex. We used stellar isochrones to derive the age of the system to be ∼180 Myr, which places its age between that of RIK 72b (a ∼10 Myr old BD in the Upper Scorpius stellar association) and AD 3116b (a ∼600 Myr old BD in the Praesepe cluster). Given the difficulty in measuring the tidal interactions between BDs and their host stars, we cannot precisely say whether this BD formed in situ or has had its orbit circularized by its host star over the relatively short age of the system. Instead, we offer an examination of plausible values for the tidal quality factor for the star and BD. TOI-503b joins a growing number of known short-period, intermediate-mass BDs orbiting main-sequence stars, and is the second such BD known to transit an A star, after HATS-70b. With the growth in the population in this regime, the driest region in the BD desert ( $35\mbox{--}55{M}_{{\rm{J}}}\sin i ) is reforesting.

Item URL in elib:https://elib.dlr.de/137505/
Document Type:Article
Title:TOI-503: The First Known Brown-dwarf Am-star Binary from the TESS Mission
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
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
Sharma, R.Astronomy & Astrophysics Division, Physical Research Laboratory, Ahmedabad 380009, IndiaUNSPECIFIED
Carmichael, T.W.Harvard University, Cambridge, MA 02138, USAUNSPECIFIED
Johnson, M. C.Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USAUNSPECIFIED
Gonzales, E.J.University of California, Santa Cruz, 1156 High Street, Santa Cruz CA 95065, USAUNSPECIFIED
Matthews, E.Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USAUNSPECIFIED
Boffin, H. M. J.European Southern Observatory, Garching bei München, DEUNSPECIFIED
Brahm, R.Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, Chile; Millennium Institute for Astrophysics, ChileUNSPECIFIED
Chaturvedi, P.Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, GermanyUNSPECIFIED
Chakraborty, A.Astronomy & Astrophysics Division, Physical Research Laboratory, Ahmedabad 380009, IndiaUNSPECIFIED
Ciardi, D.R.Caltech IPAC - NASA Exoplanet Science Institute 1200 E. California Ave, Pasadena, CA, 91125, USAUNSPECIFIED
Collins, K. A.Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USAUNSPECIFIED
Esposito, M.Thuringer Landessternwarte Tautenburg, Sternwarte 5, 07778, Tautenburg, GermanyUNSPECIFIED
Fridlund, M.Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, Sweden; Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA Leiden, The NetherlandsUNSPECIFIED
Gan, T.Physics Department and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, People’s Republic of ChinaUNSPECIFIED
Gandolfi, D.Dipartimento di Fisica, Universita di Torino, via P. Giuria 1, I-10125 Torino, ItalyUNSPECIFIED
Garcia, R.A.IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France; AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, F-91191 Gif-sur-Yvette, FranceUNSPECIFIED
Guenther, E.Thueringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIED
Hatzes, A.Thueringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIED
Latham, D.W.Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA, 02138, USAUNSPECIFIED
Mathis, S.IRFU,CEA, univerite Paris-Saclay,F-91191 Gif-sur-Yvette, FranceUNSPECIFIED
Persson, C. M.Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, SwedenUNSPECIFIED
Relles, H.School of Physical Sciences, Centre for Astrophysics and Relativity, Dublin City University, Glasnevin, Dublin 9, IrelandUNSPECIFIED
Schlieder, Joshua E.NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics Laboratory (Code 667), Greenbelt, MD, USAUNSPECIFIED
Barclay, T.NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD, 20771, USA; University of Maryland, Baltimore County, 1000 Hilltop Cir, Baltimore, MD, 21250, USAUNSPECIFIED
Dressing, C.D.Astronomy Department, University of California, Berkeley, CA 94720, USAUNSPECIFIED
Crossfield, Ian J.M.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USAUNSPECIFIED
Howard, A. W.Department of Astronomy, California Institute of Technology, Pasadena, CA, USAUNSPECIFIED
Rodler, F.Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USAUNSPECIFIED
Zhou, G.Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USAUNSPECIFIED
Quinn, Samuel N.Center for Astrophysics | Harvard and Smithsonian, Cambridge, MA, USAUNSPECIFIED
Esquerdo, G. A.Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USAUNSPECIFIED
Calkins, M. L.Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USAUNSPECIFIED
Berlind, P.Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USAUNSPECIFIED
Stassun, Keivan G.Vanderbilt University, Department of Physics & Astronomy, 6301 Stevenson Center Lane, Nashville, TN 37235, US ; Fisk University, Department of Physics, 1000 17th Avenue North, Nashville, TN 37208, US 0000-0002-3481-9052UNSPECIFIED
Blazek, M.Astronomical Institute, Czech Academy of Sciences, Fričova 298, 251 65, Ondřejov, Czech RepublicUNSPECIFIED
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
Spokova, M.Astronomical Institute, Czech Academy of Sciences, Fričova 298, 251 65, Ondřejov, Czech RepublicUNSPECIFIED
Zak, JDepartment of Theoretical Physics and Astrophysics, Masaryk University, Kotlářská 2, 61137 Brno, Czech RepublicUNSPECIFIED
Albrecht, S.Stellar Astrophysics Centre, Deparment of Physics and Astronomy, Aarhus University, Ny Munkegrade 120, 8000 Aarhus C, DenmarkUNSPECIFIED
Sobrino, AlonsoInstituto de Astrofísica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Beck, P.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, SpainUNSPECIFIED
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, Stop C1400, Austin, TX 78712, USAUNSPECIFIED
Csizmadia, Szilardszilard.csizmadia (at) dlr.deUNSPECIFIED
Fei, DDepartment of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USAUNSPECIFIED
Deeg, H.Instituto de Astrofisica de Canarias, 38205 La Laguna, Tenerife, Spain and Universidad de La Laguna, Dept. de Astrofısica, 38206 La Laguna, Tenerife, SpainUNSPECIFIED
De Leon, J.Department of Astronomy, Graduate School of Science, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, JapanUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Endl, MDepartment of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USAUNSPECIFIED
Erikson, Aanders.erikson (at) dlr.deUNSPECIFIED
Fukui, A.Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asakuchi, 719-0232 Okayama,JapanUNSPECIFIED
Georgieva, I.Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, SwedenUNSPECIFIED
Gonzalez-Cuesta, LuciaInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain ; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIED
Grziwa, S.rheinisches institut furr umweltforschung an der universitaet zu koeln, aachener strasse 209, 50931 koeln, germanyUNSPECIFIED
Hidalgo, D.Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, Tenerife, SpainUNSPECIFIED
Hirano, T.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro-ku, Tokyo, JapanUNSPECIFIED
Hjorth, MariaStellar Astrophysics Centre, Dep. of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, DenmarkUNSPECIFIED
Knudstrup, E.Institut for Physics, Karl-Franzens University of Graz, Universitätsplatz 5, A-8020 Graz, AustriaUNSPECIFIED
Korth, J.Rheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, 50931 Köln, GermanyUNSPECIFIED
Lam, K. W. F.Zentrum für Astronomie und Astrophysik, Technische Universität Berlin, Hardenbergstr. 36, D-10623 Berlin, GermanyUNSPECIFIED
Livingston, J.department of astronomy, the university of tokyo, 7-3-1 bunkyo-ku, tokyo 113-0033, japanUNSPECIFIED
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
Rodriguez, P.M.Instituto de Astrofísica de Canarias, C/Vía Láctea s/n, E-38205 La Laguna, Spain; Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIED
Murgas, F.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Narita, N.Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, JapanUNSPECIFIED
Nespral, D.Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, Tenerife, SpainUNSPECIFIED
Niraula, P.Department of Earth, Atmospheric and Planetary Sciences, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USAUNSPECIFIED
Nowak, G.Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, Tenerife, SpainUNSPECIFIED
Palle, E.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain );; Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Patzold, MRheinisches Institut fur Umweltforschung, Abteilung Planetenforschung an der Universitat zu Koln, Aachener Strasse 209, 50931 Koln, GermanyUNSPECIFIED
Prieto-Arranz, J.instituto de astrofísica de canarias, 38205 la laguna, tenerife, spain | departamento de astrofisica, universidad de la laguna, 38206 la laguna, spainUNSPECIFIED
Rauer, Hheike.rauer (at) dlr.deUNSPECIFIED
Redfield, SethAstronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT 06459, USA 0000-0003-3786-3486UNSPECIFIED
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
Smith, A M Salexis.smith (at) dlr.deUNSPECIFIED
Van Eylen, V.Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USAUNSPECIFIED
Kabath, P.Astronomical Institute, Czech Academy of Sciences, Fricova 298, 25165, Ondrejov, Czech RepublicUNSPECIFIED
Date:April 2020
Journal or Publication Title:Astronomical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:159
DOI :10.3847/1538-3881/ab7245
Page Range:p. 151
Publisher:American Astronomical Society
ISSN:0004-6256
Status:Published
Keywords:Brown dwarfs;Stellar ages;Am stars;Spectroscopy;Transit photometry;Radial velocity;Stellar rotation;Stellar astronomy
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Csizmadia, Szilard
Deposited On:16 Nov 2020 13:21
Last Modified:16 Nov 2020 13:21

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