Two Intermediate-mass Transiting Brown Dwarfs from the TESS Mission
Carmichael
T
W
author
Quinn
S
N
author
Mustill
A
J
author
Huang
C
author
Zhou
G
author
Persson
C
M
author
Nielsen
L
D
author
Collins
K
A
author
Ziegler
C
author
Collins
K
I
author
Rodriguez
J
E
author
Shporer
A
author
Brahm
R
author
Mann
A
W
author
Bouchy
F
author
Fridlund
M
author
Stassun
K
G
author
Hellier
C
author
Seidel
J
V
author
Stalport
M
author
Udry
S
author
Pepe
F
author
Ireland
M
author
Zerjal
M
author
Briceno
C
author
Law
N
author
Jordan
A
author
Espinoza
N
author
Henning
T
author
Sarkis
P
author
Latham
D
W
author
2020
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 = 6.55604 0.00016 days, a mass of M-b = 64.1 1.9 , and a radius of R-b = 0.75 0.02 . Its host star, TOI-569, has a mass of M-star = 1.21 0.05, a radius of R-star = 1.47 0.03 dex, and an effective temperature of T-eff = 5768 110 K. TOI-1406b has an orbital period of P = 10.57415 0.00063 days, a mass of M-b = 46.0 2.7 , and a radius of R-b = 0.86 0.03 . The host star for this BD has a mass of M-star = 1.18 0.09 a radius of R-star = 1.35 0.03 dex, and an effective temperature of T-eff = 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 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.
Brown dwarfs
Radial velocity
Transit photometry
Spectroscopy
Photometry
Substellar companion stars
WOS:000549117200001
exported from refbase (show.php?record=1179), last updated on Sat, 01 Aug 2020 14:47:00 -0400
text
10.3847/1538-3881/ab9b84
Carmichael_etal2020
Astronomical Journal
Astron. J.
2020
Iop Publishing Ltd
continuing
periodical
academic journal
160
1
15 pp
0004-6256