Possible substellar companions in low-mass eclipsing binaries: GU Bootis and YY Geminorum

0500557 - ASÚ 2019 RIV FR eng J - Journal Article
Wolf, M. - Kučáková, Hana - Zasche, P. - Vraštil, J. - Hoňková, K. - Hornoch, Kamil - Lehký, M. - Mašek, M. - Šmelcer, L. - Tylšar, M. - Novák, R. - Červinka, L. - Bělík, M.
Possible substellar companions in low-mass eclipsing binaries: GU Bootis and YY Geminorum.
Astronomy & Astrophysics. Roč. 620, November (2018), č. článku A72. ISSN 0004-6361. E-ISSN 1432-0746
Grant - others:GA ČR(CZ) GAP209/10/0715; GA ČR(CZ) GA15-02112S
Institutional support: RVO:67985815
Keywords : eclipsing binaries * late-type stars * stars fundamental parameters
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.209, year: 2018

We present the next results of our long-term observational project to analyze the variations in the orbital periods of low-mass eclipsing binaries. About 70 new precise mid-eclipse times recorded with a CCD were obtained for two eclipsing binaries with short orbital periods: GU Boo (P = 0.​d49) and YY Gem (0.​d81). Observed-minus-calculated diagrams of the stars were analyzed using all reliable timings, and new parameters of the light-time effect were obtained. We derived for the first time or improved the short orbital periods of possible third bodies of 11 and 54 years for these low-mass binaries, respectively. We calculated that the minimum masses of the third components are close to 50 MJup, which corresponds to the mass of brown dwarfs. The multiplicity of these systems also plays an important role in the precise determination of their physical parameters.
Permanent Link: http://hdl.handle.net/11104/0292652