2022ApJ...932...91M

Query : 2022ApJ...932...91M

2022ApJ...932...91M - Astrophys. J., 932, 91-91 (2022/June-3)

Where to Find Overmassive Brown Dwarfs: New Benchmark Systems for Binary Evolution.

MAJIDI D., FORBES J.C. and LOEB A.

Abstract (from CDS):

Under the right conditions, brown dwarfs that gain enough mass late in their lives to cross the hydrogen-burning limit will not turn into low-mass stars, but rather remain essentially brown dwarf-like. While these objects, called either beige dwarfs or overmassive brown dwarfs, may exist in principle, it remains unclear exactly how they would form astrophysically. We show that accretion from AGB winds, aided by the wind Roche lobe overflow mechanism, is likely to produce a substantial population of observable overmassive brown dwarfs, though other mechanisms are still plausible. Specifically, we predict that Sun-like stars born with a massive brown dwarf companion on an orbit with a semimajor axis of order 10 au will likely produce overmassive brown dwarfs, which may be found today as companions to the donor star's remnant white dwarf. The identification and characterization of such an object would produce unique constraints on binary evolution, because there is a solid upper limit on the brown dwarf's initial mass.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Brown dwarfs - Stellar evolutionary types - Stellar evolution - Binary stars - Asymptotic giant branch stars - White dwarf stars - Low-mass stars

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 TOI-811b BD? 05 52 07.2569953541 -32 55 30.663337365           ~ 16 0

Query : 2022ApJ...932...91M

Basic data :
TOI-811b -- Brown Dwarf Candidate
Other object types: otypes_help 		Pl? (2021ApJS,TOI), BD? (2021AJ)
ICRS coord. (ep=J2000) : 		05 52 07.2569953541 -32 55 30.663337365 (Optical) [ 0.0161 0.0203 90 ] A 2018yCat.1345....0G
FK4 coord. (ep=B1950 eq=1950) : 		05 50 16.7099379695 -32 56 10.509803316 [ 0.0161 0.0203 90 ]
Gal coord. (ep=J2000) : 		238.3604797620357 -26.0428722502956 [ 0.0161 0.0203 90 ]
Proper motions mas/yr : 		14.968 25.624 [0.036 0.045 90] A 2018yCat.1345....0G
Parallaxes (mas): 		3.4923 [0.0211] A 2018yCat.1345....0G
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TOI-811b TOI-811.01

References (16 between 1850 and 2026) (Total 16)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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