2022RAA....22c5022D -
Research in Astron. and astroph., 22, part no 3, 5022-5022 (2022/March-~)
Physical Properties of 29 sdB+dM Eclipsing Binaries in Zwicky Transient Facility.
DAI M., CHEN X.-D., WANG K., LUO Y.-P., WANG S. and DENG L.-C.
Abstract (from CDS):
The development of large-scale time-domain surveys provides an opportunity to study the physical properties as well as the evolutionary scenario of B-type subdwarfs (sdBs) and M-type dwarfs (dMs). Here, we obtained 33 sdB+dM eclipsing binaries based on the Zwicky Transient Facility (ZTF) light curves and Gaia Early Data Release 3 (EDR3) parallaxes. By using the PHOEBE code for light curve analysis, we obtain probability distributions for parameters of 29 sdB+dMs. R1, R2 and i are well determined, and the average uncertainty of mass ratio q is 0.08. Our parameters are in good agreement with previous works if a typical mass of sdB is assumed. Based on parameters of 29 sdB+dMs, we find that both the mass ratio q and the companion's radius R2 decrease with the shortening of the orbital period. For the three sdB+dMs with orbital periods less than 0.075 days, their companions are all brown dwarfs. The masses and radii of the companions satisfy the mass-radius relation for low-mass stars and brown dwarfs. Companions with radii between 0.12 R☉ and 0.15 R☉ seem to be missing in the observations. As more short-period sdB+dM eclipsing binaries are discovered and classified in the future with ZTF and Gaia, we will have more information to constrain the evolutionary ending of sdB+dMs.
Abstract Copyright:
© 2022. National Astronomical Observatories, CAS and IOP Publishing Ltd.
Journal keyword(s):
(stars:) binaries: eclipsing - stars: evolution - (stars:) subdwarfs - (stars:) brown dwarfs
Simbad objects:
29
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