A photometric study of NSVS 7453183: a probable quadruple system with long-term surface activity
Abstract
The VRC light curves were regularly measured for the eclipsing binary NSVS 7453183 as a part of our long-term observational project for studying of low-mass eclipsing binaries with a short orbital period and surface activity. The TESS light curve solution in PHOEBE results to the detached configuration, where the temperature of primary component was adopted to T1 = 4300 K according to the SED approximation. It gives us T2 = 4080 ± 100 K for the secondary component. The spectral type of the primary component was estimated to be K6, and the photometric mass ratio was derived q = 0.86. We confirm presence of the third body in this system, a stellar companion with a minimal mass 0.33 M⊙ orbiting the eclipsing pair with a short period about 425 days, and propose the next, fourth body with a longer orbiting period of about 12 years, probably a brown dwarf with the minimal mass of 50 MJup. The hierarchical structure ((1+1)+1) + 1 of this quadruple system is assumed. Characteristics and temporal variations of the dark region on the surface of the primary component were estimated. The average migration speed of about 10° per month was found during years 2020-2022.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- March 2023
- DOI:
- 10.1093/mnras/stad053
- arXiv:
- arXiv:2301.05617
- Bibcode:
- 2023MNRAS.520..353S
- Keywords:
-
- stars: activity;
- binaries: close;
- binaries: eclipsing;
- stars: fundamental parameters;
- stars: individual: NSVS 7453183;
- stars: low-mass;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- Accepted for publication in MNRAS. 11 pages, 9 figures, 9 tables. This is the authors' version of the accepted manuscript