Parameters for the low-mass triple system KIC 5731312
Abstract
KIC 5731312 is an eclipsing binary discovered by the Kepler Mission that contains two moderately low-mass stars (~0.75 solar masses and ~0.57 solar masses) in a short-period, eccentric orbit (P ~ 7.95 days, e ~ 0.47). It is also a double-lined spectroscopic binary, thereby making it an ideal system to derive precise masses and radii of the two stars. In particular, accurate parameters for low-mass stars are of interest given that many low-mass stars are "inflated" whereby their measured radii are larger than expected based on evolutionary models. Eclipse timing measurements from the Kepler data for this object showed the presence of a non-eclipsing, low-mass stellar companion (M ~ 0.16 solar masses) on a very long-period, eccentric orbit (P3 ~ 916 days and e3 ~ 0.58). This low-mass companion is causing the orbit of the inner binary to precess, and as a result of this precession, the primary and secondary eclipses are getting shallower with time. More importantly, this forced precession of the binary opens up the possibility of measuring the tidal apsidal constants for the component stars. In this work we report our latest results that combine the Kepler data, follow-up ground-based photometry and spectroscopy, and data from TESS, which extends the time span of eclipse observations to nearly 10 years.
- Publication:
-
American Astronomical Society Meeting Abstracts #235
- Pub Date:
- January 2020
- Bibcode:
- 2020AAS...23540602O