Five new eclipsing binaries with low-mass companions
Journal article, 2024
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.
Stars: fundamental parameters
Techniques: radial velocities
Binaries: eclipsing
Stars: low-mass
Author
J. Lipták
Charles University
Czech Academy of Sciences
Marek Skarka
Czech Academy of Sciences
Masaryk University
E. W. Guenther
Thüringer Landessternwarte Tautenburg
Priyanka Chaturvedi
Thüringer Landessternwarte Tautenburg
M. Vítková
Czech Academy of Sciences
Masaryk University
R. Karjalainen
Czech Academy of Sciences
J. Šubjak
Czech Academy of Sciences
Harvard-Smithsonian Center for Astrophysics
A. Hatzes
Thüringer Landessternwarte Tautenburg
Allyson Bieryla
Harvard-Smithsonian Center for Astrophysics
D. Gandolfi
University of Turin
Simon Albrecht
Aarhus University
P. G. Beck
University of La Laguna
Instituto de Astrofísica de Canarias
H. Deeg
University of La Laguna
Instituto de Astrofísica de Canarias
M.E. Everett
NOIRLab
Jesus Higuera
NOIRLab
David Jones
University of La Laguna
Nordic Optical Telescope
Instituto de Astrofísica de Canarias
S. Mathur
Instituto de Astrofísica de Canarias
University of La Laguna
Y. G. Patel
NOIRLab
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
S. Redfield
Wesleyan University
Petr Kabath
Czech Academy of Sciences
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 690 A168Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/202450038