Five new eclipsing binaries with low-mass companions

• Main Authors: Lipták, J, Skarka, M, Guenther, E, Chaturvedi, P, Vítková, M, Karjalainen, R, Šubjak, J, Hatzes, A, Bieryla, A, Gandolfi, D, Albrecht, S. H, Beck, P. G, Deeg, H. J, Everett, M. E, Higuera, J, Jones, D, Mathur, S, Patel, Y. G, Persson, C. M, Redfield, S, Kabáth, P
• Format: Journal Article
• Language: English
• Published: 13-08-2024
• Subjects: Physics - Earth and Planetary Astrophysics; Physics - Solar and Stellar Astrophysics
• DOI: 10.48550/arxiv.2408.06897

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 $M_2={0.131(8)}{M_\odot}$. TOI-1143 consists of an F6 primary
with an $M_2={0.142(3)}{M_\odot}$ 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.