Greening of the brown-dwarf desert. EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00511639" target="_blank" >RIV/67985815:_____/19:00511639 - isvavai.cz</a>
Alternative codes found
RIV/00216224:14310/19:00111909 RIV/00216208:11320/19:10415022
Result on the web
<a href="https://doi.org/10.1051/0004-6361/201935505" target="_blank" >https://doi.org/10.1051/0004-6361/201935505</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/201935505" target="_blank" >10.1051/0004-6361/201935505</a>

Result language
angličtina
Original language name
Greening of the brown-dwarf desert. EPIC 212036875b: a 51 M-J object in a 5-day orbit around an F7V star
Original language description
Our aim is to investigate the nature and formation of brown dwarfs by adding a new well-characterised object, in terms of its mass, radius and bulk density, to the currently small sample of less than 20 transiting brown dwarfs. EPIC 212036875 b is a rare object that resides in the brown-dwarf desert. In the mass-density diagram for planets, brown dwarfs, and stars, we find that all giant planets and brown dwarfs follow the same trend from similar to 0.3 M-J to the turn-over to hydrogen burning stars at similar to 73 M-J. EPIC 212036875 b falls close to the theoretical model for mature H/He dominated objects in this diagram as determined by interior structure models. We argue that EPIC 212036875 b formed via gravitational disc instabilities in the outer part of the disc, followed by a quick migration. Orbital tidal circularisation may have started early in its history for a brief period when the brown dwarf's radius was larger. The lack of spin-orbit synchronisation points to a weak stellar dissipation parameter (Q(star)' greater than or similar to 10(8)), which implies a circularisation timescale of greater than or similar to 23 Gyr, or suggests an interaction between the magnetic and tidal forces of the star and the brown dwarf.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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