2021/01/20 by M. Wolf, H. Kučáková, P. Zasche +6 · 16 citations
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Brown dwarf #Circumbinary planet #Eclipse #Gamma-ray bursts and supernovae #Light curve #Orbit (dynamics) #Orbital elements #Orbital period #Physics #Stars #Stellar, planetary, and galactic studies #astro-ph.SR
paper · pdf · open access · doi:10.1051/0004-6361/202039851
published in Astronomy and Astrophysics 647, A65 (EDP Sciences) · 7 pages, 4 figures, Accepted in Astronomy&Astrophysics
openalex publication_date 2021/01/20 · arxiv created 2021/01/21 · openalex created_date 2021/02/01 · arxiv updated 2021/03/17 · openalex updated_date 2026/08/05
We present the new results of our long-term observational project to detect the small variations in the orbital periods of low-mass and short-period eclipsing binaries. About 120 new precise mid-eclipse times were obtained for three relatively well-known dwarf eclipsing binaries: SDSS J143547.87+373338.5 (P = 0.126 d), NSVS 07826147 (0.162 d), and NSVS 14256825 (0.110 d). Observed-minus-calculated (O-C) diagrams of these systems were analyzed using all accurate timings, and, where possible, new parameters of the light-time effect were calculated. For the first time, we derive (or improve upon previous findings with regard to) the short orbital periods of 13 and 10 years of possible third bodies for SDSS J143547.87+373338.5 and NSVS 07826147, respectively. In these binaries, our data show that period variations can be modeled simply on the basis of a single circumbinary object. For the first two objects, we calculated the minimum mass of the third components to be 17 MJ, and 1.4 MJ respectively, which corresponds to the mass of a brown dwarf or a giant planet. For NSVS 14256825, the cyclical period changes caused by a single additional body cannot be confirmed by our recent eclipse time measurements. More complex behavior connected with two orbiting bodies, or yet unknown effects, should be taken into account.