J/A+A/652/A127 13-150MJup eclipsing binaries transiting comp. (Grieves+, 2021)
Populating the brown dwarf and stellar boundary:
Five stars with transiting companions near the hydrogen-burning mass limit.
Grieves N., Bouchy F., Lendl M., Carmichael T., Mireles I., Shporer A.,
Mcleod K.K., Collins K.A., Brahm R., Stassun K.G., Gill S., Bouma L.G.,
Guillot T., Cointepas M., Dos Santos L.A., Casewell S.L., Jenkins J.M.,
Henning T., Nielsen L.D., Psaridi A., Udry S., Segransan D., Eastman J.D.,
Zhou G., Abe L., Agabi A., Bakos G., Charbonneau D., Collins K.I.,
Colon K.D., Crouzet N., Dransfield G., Evans P., Goeke R.F., Hart R.,
Irwin J.M., Jensen E.L.N., Jordan A., Kielkopf J.F., Latham D.W.,
Marie-sainte W., Mekarnia D., Nelson P., Quinn S.N., Radford D.J.,
Rodriguez D.R., Rowden P., Schmider F.-X., Schwarz R.P., Smith J.C.,
Stockdale C., Suarez O., Tan T.-G., Triaud A.H.M.J., Waalkes W., Wingham G.
<Astron. Astrophys., 652, A127 (2021)>
=2021A&A...652A.127G 2021A&A...652A.127G (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Stars, masses ; Stars, diameters ;
Effective temperatures ; Abundances, [Fe/H] ; Optical
Keywords: brown dwarfs - stars: low-mass - binaries: eclipsing
Abstract:
We report the discovery of five transiting companions near the
hydrogen-burning mass limit in close orbits around main sequence stars
originally identified by the Transiting Exoplanet Survey Satellite
(TESS) as TESS objects of interest (TOIs): TOI-148, TOI-587, TOI-681,
TOI-746, and TOI-1213. Using TESS and ground-based photometry as well
as radial velocities from the CORALIE, CHIRON, TRES, and FEROS
spectrographs, we found the companions have orbital periods between
4.8 and 27.2 days, masses between 77 and 98MJup , and radii between
0.81 and 1.66 RJup . These targets have masses near the uncertain
lower limit of hydrogen core fusion (∼73-96MJup ), which separates
brown dwarfs and low-mass stars. We constrained young ages for TOI-587
(0.2±0.1Gyr) and TOI-681 (0.17±0.03Gyr) and found them to have
relatively larger radii compared to other transiting companions of a
similar mass. Conversely we estimated older ages for TOI-148 and
TOI-746 and found them to have relatively smaller companion radii.
With an effective temperature of 9800±200K, TOI-587 is the hottest
known main-sequence star to host a transiting brown dwarf or very
low-mass star. We found evidence of spin-orbit synchronization for
TOI-148 and TOI-746 as well as tidal circularization for TOI-148.
These companions add to the population of brown dwarfs and very
low-mass stars with well measured parameters ideal to test formation
models of these rare objects, the origin of the brown dwarf desert,
and the distinction between brown dwarfs and hydrogen-burning main
sequence stars.
Description:
Published 13-150MJup transiting companions as of June 2021.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 143 54 Published 13-150MJup transiting companions
as of June 2021
refs.dat 66 40 References
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See also:
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Name (1)
19- 23 F5.1 Mjup M2 Mass of the companion
25- 28 F4.1 Mjup E_M2 Error on M2, upper value
30- 33 F4.1 Mjup e_M2 Error on M2, lower value
35- 38 F4.2 Rjup R2 Radius of the companion
40- 43 F4.2 Rjup E_R2 Error on R2, upper value
45- 48 F4.2 Rjup e_R2 Error on R2, lower value
50- 55 F6.2 d P Period
57 A1 --- l_ecc Limit flag on ecc
58- 62 F5.3 --- ecc Eccentricity
63 A1 --- n_ecc [f] f for fixed
65- 69 F5.3 --- E_ecc ? Error on ecc, upper value
71- 75 F5.3 --- e_ecc ? Error on ecc, lower value
77- 80 F4.2 Mgeo M1 ?=- Mass of the star
82- 85 F4.2 Mgeo E_M1 ? Error on M1, upper value
87- 90 F4.2 Mgeo e_M1 ? Error on M1, lower value
92- 95 F4.2 Rgeo R1 Radius of the star
97-100 F4.2 Rgeo E_R1 Error on R1, upper value
102-105 F4.2 Rgeo e_R1 Error on R1, lower value
107-110 I4 K Teff ?=- Effective temperature
112-114 I3 K E_Teff ? Error on Teff, upper value
116-118 I3 K e_Teff ? Error on Teff, lower value
120-123 F4.2 [-] [Fe/H] ?=- Metallicity
125-128 F4.2 [-] E_[Fe/H] ? Error on [Fe/H], upper value
130-133 F4.2 [-] e_[Fe/H] ? Error on [Fe/H], lower value
135-143 A9 --- Ref Reference, in refs.dat file
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Note (1): The brown dwarf binary system from Stassun et al.
(2006Natur.440..311S 2006Natur.440..311S), triple system from Triaud et al. (2020NatAs...4..650T 2020NatAs...4..650T),
and white dwarf companions are not included.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode BibCode
24- 44 A21 --- Aut Author's name
46- 66 A21 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Oct-2021