Volume 620, December 2018
|Number of page(s)||7|
|Section||Stellar structure and evolution|
|Published online||30 November 2018|
Possible substellar companions in low-mass eclipsing binaries: GU Bootis and YY Geminorum
Astronomical Institute, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00
Praha 8, Czech Republic
2 Astronomical Institute, Academy of Sciences, Fričova 298, 251 65 Ondřejov, Czech Republic
3 Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo nám. 13, 746 01 Opava, Czech Republic
4 Variable Star and Exoplanet Section of the Czech Astronomical Society, Czech Republic
5 Observatory Valašské Meziříčí, Vsetínská 78, 757 01 Valašské Meziříčí, Czech Republic
6 Observatory Prostějov, Kolářovy sady 3348, 796 01 Prostějov, Czech Republic
7 Faculty of Civil Engineering, University of Technology, Brno, Czech Republic
8 Observatory Mladá Boleslav, 294 04 Dolní Bousov, Czech Republic
9 Observatory Úpice, U Lipek 160, 542 32 Úpice, Czech Republic
Accepted: 22 September 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.
Key words: (stars:) binaries: eclipsing / stars: late-type / stars: individual: GU Bootis / stars: individual: YY Geminorum / stars: fundamental parameters
© ESO 2018
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