TOI-503: The First Known Brown-dwarf Am-star Binary from the TESS Mission
Artikel i vetenskaplig tidskrift, 2020

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 1.34+ R b 0.150.26 J). We obtained highresolution spectroscopic observations with the FIES, Ondr.ejov, PARAS, Tautenburg, and TRES spectrographs, and measured the mass of TOI-503b to be Mb.=.53.7.+/-.1.2 MJ. The host star has a mass of Ma.=.1.80.+/-.0.06Me, a radius of Ra.=.1.70.+/-.0.05Re, 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 mainsequence 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 (35-55MJ sin i) is reforesting.

Radial velocity

Transit photometry

Spectroscopy

Stellar astronomy

Am stars

Brown dwarfs

Stellar rotation

Stellar ages

Författare

Jan Subjak

Univerzita Karlova v Praze

Czech Academy of Sciences

Rishikesh Sharma

Yamada Physics Research Laboratory

Theron W. Carmichael

Harvard University

Harvard-Smithsonian Center for Astrophysics

Marshall C. Johnson

Las Cumbres Observ, 6740 Cortona Dr, Suite 102

Erica J. Gonzales

University of California at Santa Cruz

Elisabeth Matthews

Massachusetts Institute of Technology (MIT)

Henri M. J. Boffin

ESO

Rafael Brahm

Pontificia Universidad Catolica de Chile

Millennium Institute of Astrophysics

Priyanka Chaturvedi

Thüringer Landessternwarte Tautenburg

Abhijit Chakraborty

Yamada Physics Research Laboratory

David R. Ciardi

California Institute of Technology (Caltech)

Karen A. Collins

Harvard-Smithsonian Center for Astrophysics

Massimiliano Esposito

Thüringer Landessternwarte Tautenburg

Malcolm Fridlund

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

Universiteit Leiden

Tianjun Gan

Tsinghua University

Davide Gandolfi

Universita degli Studi di Torino

Rafael A. Garcia

Université Paris-Saclay

Université Paris Diderot

Eike Guenther

Thüringer Landessternwarte Tautenburg

Artie Hatzes

Thüringer Landessternwarte Tautenburg

David W. Latham

Harvard-Smithsonian Center for Astrophysics

Stephane Mathis

Université Paris-Saclay

Université Paris Diderot

Savita Mathur

Instituto Astrofisico de Canarias

Universidad de la Laguna

Carina Persson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

Howard M. Relles

Harvard-Smithsonian Center for Astrophysics

Joshua E. Schlieder

NASA Goddard Space Flight Center

Thomas Barclay

NASA Goddard Space Flight Center

Courtney D. Dressing

University of California

Ian Crossfield

Massachusetts Institute of Technology (MIT)

Andrew W. Howard

California Institute of Technology (Caltech)

Florian Rodler

European Southern Observatory Santiago

George Zhou

Harvard-Smithsonian Center for Astrophysics

Samuel N. Quinn

Harvard-Smithsonian Center for Astrophysics

Gilbert A. Esquerdo

Harvard-Smithsonian Center for Astrophysics

Michael L. Calkins

Harvard-Smithsonian Center for Astrophysics

Perry Berlind

Harvard-Smithsonian Center for Astrophysics

Keivan G. Stassun

Fisk University

Vanderbilt University

Martin Blazek

Masarykova Univerzita

Czech Academy of Sciences

Marek Skarka

Masarykova Univerzita

Czech Academy of Sciences

Magdalena Spokova

Masarykova Univerzita

Czech Academy of Sciences

Jiri Zak

Masarykova Univerzita

Simon Albrecht

Aarhus Universitet

Roi Alonso Sobrino

Instituto Astrofisico de Canarias

Universidad de la Laguna

Paul Beck

Karl-Franzens-Universität Graz

Instituto Astrofisico de Canarias

Universidad de la Laguna

Juan Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Ilaria Carleo

Wesleyan University

William D. Cochran

The University of Texas at Austin

Szilard Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Fei Dai

Massachusetts Institute of Technology (MIT)

Princeton University

Hans J. Deeg

Instituto Astrofisico de Canarias

Universidad de la Laguna

Jerome P. de Leon

University of Tokyo

Philipp Eigmueller

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Michael Endl

The University of Texas at Austin

Anders Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Akihiko Fukui

University of Tokyo

Instituto Astrofisico de Canarias

National Astronomical Observatory of Japan

Iskra Georgieva

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

Lucia Gonzalez-Cuesta

Universidad de la Laguna

Instituto Astrofisico de Canarias

Sascha Grziwa

Universität zu Köln

Diego Hidalgo

Instituto Astrofisico de Canarias

Universidad de la Laguna

Teruyuki Hirano

Tokyo Institute of Technology

Maria Hjorth

Karl-Franzens-Universität Graz

Emil Knudstrup

Karl-Franzens-Universität Graz

Judith Korth

Universität zu Köln

Kristine W. F. Lam

Technische Universität Berlin

John H. Livingston

University of Tokyo

Mikkel N. Lund

Aarhus Universitet

Rafael Luque

Instituto Astrofisico de Canarias

Universidad de la Laguna

Pilar Montanes Rodriguez

Universidad de la Laguna

Instituto Astrofisico de Canarias

Felipe Murgas

Universidad de la Laguna

Instituto Astrofisico de Canarias

Norio Narita

Instituto Astrofisico de Canarias

Astrobiol Ctr

National Astronomical Observatory of Japan

Japan Science and Technology Agency

David Nespral

Universidad de la Laguna

Instituto Astrofisico de Canarias

Prajwal Niraula

Massachusetts Institute of Technology (MIT)

Grzegorz Nowak

Instituto Astrofisico de Canarias

Universidad de la Laguna

Enric Palle

Universidad de la Laguna

Instituto Astrofisico de Canarias

Martin Paetzold

Universität zu Köln

Jorge Prieto-Arranz

Instituto Astrofisico de Canarias

Universidad de la Laguna

Heike Rauer

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Freie Universität Berlin

Technische Universität Berlin

Seth Redfield

Wesleyan University

Ignasi Ribas

Institut d'Estudis Espacials de Catalunya (IEEC)

Consejo Superior de Investigaciones Científicas (CSIC)

Alexis M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Vincent Van Eylen

Princeton University

Petr Kabath

Czech Academy of Sciences

Astronomical Journal

0004-6256 (ISSN) 1538-3881 (eISSN)

Vol. 159 4 151

Ämneskategorier

Astronomi, astrofysik och kosmologi

Geologi

Multidisciplinär geovetenskap

DOI

10.3847/1538-3881/ab7245

Mer information

Senast uppdaterat

2020-09-24