Five new eclipsing binaries with low-mass companions
Gandolfi, D.; Persson, C. M.; Deeg, H. J.; Redfield, S.; Mathur, S.; Bieryla, A.; Skarka, M.; Karjalainen, R.; Kabáth, P.; Jones, D.; Chaturvedi, P.; Hatzes, A.; Guenther, E.; Beck, P. G.; Šubjak, J.; Everett, M. E.; Lipták, J.; Patel, Y. G.; Vítková, M.; Albrecht, S. H.; Higuera, J.
Czech Republic, Česko, Germany, United States, Italy, Denmark, Spain, Sweden
Abstract
Precise space-based photometry from the Transiting Exoplanet Survey Satellite results in a huge number of exoplanetary candidates. However, the masses of these objects are unknown and must be determined by ground-based spectroscopic follow-up observations, frequently revealing the companions to be low-mass stars rather than exoplanets. We present the first orbital and stellar parameter solutions for five such eclipsing binary-star systems using radial-velocity follow-up measurements together with spectral-energy-distribution solutions. TOI-416 and TOI-1143 are totally eclipsing F+M star systems with well-determined secondary masses, radii, and temperatures. TOI-416 is a circular system with an F6 primary and a secondary with a mass of M2 = 0.131(8) M⊙. TOI-1143 consists of an F6 primary with an M2 = 0.142(3) M⊙ secondary on an eccentric orbit with a third companion. With respect to the other systems, TOI-1153 shows ellipsoidal variations, TOI-1615 contains a pulsating primary, and TOI-1788 has a spotted primary, while all have moderate mass ratios of 0.2–0.4. However, these systems are in a grazing configuration, which limits their full description. The parameters of TOI-416B and TOI-1143B are suitable for the calibration of the radius-mass relation for dwarf stars.