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Mikkel Nørup Lund

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

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DOI

  • Ján Šubjak, Czech Academy of Sciences
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  • Ján Šubjak, Charles University
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  • Rishikesh Sharma, Physical Research Laboratory India
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  • Theron W. Carmichael, Harvard University
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  • Theron W. Carmichael, Harvard University
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  • Marshall C. Johnson, Las Cumbres Observatory Global Telescope Network, Inc
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  • Erica J. Gonzales, University of California at Santa Cruz
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  • Elisabeth Matthews, Massachusetts Institute of Technology
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  • Henri M.J. Boffin, European Southern Observatory
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  • Rafael Brahm, Pontificia Universidad Catolica de Chile
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  • Rafael Brahm, Pontificia Universidad Catolica de Chile
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  • Rafael Brahm, Millennium Institute for Astrophysics
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  • Priyanka Chaturvedi, Karl Schwarzschild Observatory
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  • Abhijit Chakraborty, Physical Research Laboratory India
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  • David R. Ciardi, California Institute of Technology
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  • Karen A. Collins, Harvard University
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  • Massimiliano Esposito, Karl Schwarzschild Observatory
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  • Malcolm Fridlund, Chalmers University of Technology
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  • Malcolm Fridlund, Leiden University
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  • Tianjun Gan, Tsinghua University
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  • Davide Gandolfi, University of Turin
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  • Rafael A. Garciá, Universite Paris-Saclay
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  • Rafael A. Garciá, Universite Paris-Saclay
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  • Eike Guenther, Karl Schwarzschild Observatory
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  • Artie Hatzes, Karl Schwarzschild Observatory
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  • David W. Latham, Harvard University
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  • Stéphane Mathis, Universite Paris-Saclay
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  • Stéphane Mathis, Universite Paris-Saclay
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  • Savita Mathur, Instituto Astrofisico de Canarias
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  • Savita Mathur, University of La Laguna
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  • Carina M. Persson, Chalmers University of Technology
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  • Howard M. Relles, Harvard University
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  • Joshua E. Schlieder, NASA Goddard Space Flight Center
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  • Thomas Barclay, NASA Goddard Space Flight Center
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  • Courtney D. Dressing, University of California at Berkeley
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  • Ian Crossfield, Massachusetts Institute of Technology
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  • Andrew W. Howard, California Institute of Technology
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  • Florian Rodler, European Southern Observatory
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  • George Zhou, Harvard University
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  • Samuel N. Quinn, Harvard University
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  • Gilbert A. Esquerdo, Harvard University
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  • Michael L. Calkins, Harvard University
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  • Perry Berlind, Harvard University
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  • Keivan G. Stassun, Vanderbilt University
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  • Keivan G. Stassun, Fisk University
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  • Martin Blažek, Czech Academy of Sciences
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  • Martin Blažek, Masaryk University
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  • Marek Skarka, Czech Academy of Sciences
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  • Marek Skarka, Masaryk University
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  • Magdalena Špoková, Czech Academy of Sciences
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  • Magdalena Špoková, Masaryk University
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  • Jirí Žák, Masaryk University
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  • Simon Albrecht
  • Roi Alonso Sobrino, Instituto Astrofisico de Canarias
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  • Roi Alonso Sobrino, University of La Laguna
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  • Paul Beck, Instituto Astrofisico de Canarias
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  • Paul Beck, University of La Laguna
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  • Paul Beck, University of Graz
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  • Juan Cabrera, German Aerospace Center
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  • Ilaria Carleo, Wesleyan University
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  • William D. Cochran, University of Texas at Austin
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  • Szilard Csizmadia, German Aerospace Center
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  • Fei Dai, Massachusetts Institute of Technology
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  • Fei Dai, Princeton University
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  • Hans J. Deeg, Instituto Astrofisico de Canarias
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  • Hans J. Deeg, University of La Laguna
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  • Jerome P. De Leon, University of Tokyo
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  • Philipp Eigmüller, German Aerospace Center
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  • Michael Endl, University of Texas at Austin
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  • Anders Erikson, German Aerospace Center
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  • Akihiko Fukui, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
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  • Akihiko Fukui, University of Tokyo
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  • Akihiko Fukui, Instituto Astrofisico de Canarias
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  • Iskra Georgieva, Chalmers University of Technology
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  • Luciá González-Cuesta, Instituto Astrofisico de Canarias
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  • Luciá González-Cuesta, University of La Laguna
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  • Sascha Grziwa, University of Cologne
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  • Diego Hidalgo, Instituto Astrofisico de Canarias
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  • Diego Hidalgo, University of La Laguna
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  • Teruyuki Hirano, Tokyo Institute of Technology
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  • Maria Hjorth, University of Graz
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  • Emil Knudstrup
  • Judith Korth, University of Cologne
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  • Kristine W.F. Lam, Technical University of Berlin
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  • John H. Livingston, University of Tokyo
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  • Mikkel N. Lund
  • Rafael Luque, Instituto Astrofisico de Canarias
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  • Rafael Luque, University of La Laguna
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  • Pilar Montanes Rodríguez, Instituto Astrofisico de Canarias
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  • Pilar Montanes Rodríguez, University of La Laguna
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  • Felipe Murgas, Instituto Astrofisico de Canarias
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  • Felipe Murgas, University of La Laguna
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  • Norio Narita, Instituto Astrofisico de Canarias
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  • Norio Narita, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
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  • Norio Narita, Astrobiology Center
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  • Norio Narita, Japan Science and Technology Agency
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  • David Nespral, Instituto Astrofisico de Canarias
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  • David Nespral, University of La Laguna
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  • Prajwal Niraula, Massachusetts Institute of Technology
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  • Grzegorz Nowak, Instituto Astrofisico de Canarias
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  • Grzegorz Nowak, University of La Laguna
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  • Enric Pallé, Instituto Astrofisico de Canarias
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  • Enric Pallé, University of La Laguna
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  • Martin Pätzold, University of Cologne
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  • Jorge Prieto-Arranz, Instituto Astrofisico de Canarias
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  • Jorge Prieto-Arranz, University of La Laguna
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  • Heike Rauer, German Aerospace Center
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  • Heike Rauer, Technical University of Berlin
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  • Heike Rauer, Free University of Berlin
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  • Seth Redfield, Wesleyan University
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  • Ignasi Ribas, CSIC
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  • Ignasi Ribas, Institute of Space Studies of Catalonia
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  • Alexis M.S. Smith, German Aerospace Center
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  • Vincent Van Eylen, Princeton University
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  • Petr Kabáth, Czech Academy of Sciences

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 . We obtained high-resolution spectroscopic observations with the FIES, Ondrejov, PARAS, Tautenburg, and TRES spectrographs, and measured the mass of TOI-503b to be M b = 53.7 ± 1.2 a radius of R = 1.70 ± 0.05R o, an effective temperature of T eff = 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 is reforesting.

OriginalsprogEngelsk
Artikelnummer151
TidsskriftAstronomical Journal
Vol/bind159
Nummer4
ISSN0004-6256
DOI
StatusUdgivet - apr. 2020

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