The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Alexander Mustill. Profile picture.

Alexander Mustill

Researcher

Alexander Mustill. Profile picture.

Two Intermediate-mass Transiting Brown Dwarfs from the TESS Mission

Author

  • Theron W. Carmichael
  • Samuel N. Quinn
  • Alexander J. Mustill
  • Chelsea Huang
  • George Zhou
  • Carina M. Persson
  • Louise D. Nielsen
  • Karen A. Collins
  • Carl Ziegler
  • Kevin I. Collins
  • Joseph E. Rodriguez
  • Avi Shporer
  • Rafael Brahm
  • Andrew W. Mann
  • Francois Bouchy
  • Malcolm Fridlund
  • Keivan G. Stassun
  • Coel Hellier
  • Julia V. Seidel
  • Manu Stalport
  • Stephane Udry
  • Francesco Pepe
  • Michael Ireland
  • Maruša Žerjal
  • César Briceño
  • Nicholas Law
  • Andrés Jordán
  • Néstor Espinoza
  • Thomas Henning
  • Paula Sarkis
  • David W. Latham
Show all

Summary, in English

We report the discovery of two intermediate-mass transiting brown dwarfs (BDs), TOI-569b and TOI-1406b, from NASA's Transiting Exoplanet Survey Satellite mission. TOI-569b has an orbital period of P=.55604±0.00016 days, a mass of Mb = 64.1±1.9 MJ, and a radius of Rb = 0.75±0.02 RJ. Its host star, TOI-569, has a mass of Må = 1.21±0.05 M, a radius of Rå = 1.47±0.03 R, [Fe H 0.29 0.09] = + dex, and an effective temperature of Teff = 5768±10K. TOI-1406b has an orbital period of P=10.57415±0.00063 days, a mass of Mb = 46.0± 2.7 MJ, and a radius of Rb = 0.86±0.03 RJ. The host star for this BD has a mass of Må = 1.18±0.09 M, a radius of Rå = 1.35±0.03 R, [Fe/H] =-0.08± 0.09 dex, and an effective temperature of Teff = 6290±100 K. Both BDs are in circular orbits around their host stars and are older than 3 Gyr based on stellar isochrone models of the stars. TOI-569 is one of two slightly evolved stars known to host a transiting BD (the other being KOI-415). TOI-1406b is one of three known transiting BDs to occupy the mass range of 40-50 MJ and one of two to have a circular orbit at a period near 10 days (with the first being KOI-205b). Both BDs have reliable ages from stellar isochrones, in addition to their well-constrained masses and radii, making them particularly valuable as tests for substellar isochrones in the BD mass-radius diagram.

Department/s

  • Lund Observatory - Has been reorganised

Publishing year

2020

Language

English

Publication/Series

The Astronomical Journal

Volume

160

Issue

1

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Astronomy, Astrophysics and Cosmology

Status

Published

Project

  • What will the PLATO observatory tell us about star-planet tidal interactions?
  • IMPACT: Comets, asteroids and the habitability of planets

ISBN/ISSN/Other

  • ISSN: 0004-6256