Physical Properties of 29 sdB+dM Eclipsing Binaries in Zwicky Transient Facility

The development of large-scale time-domain surveys provides an opportunity to study the physical properties as well evolutionary scenario B-type subdwarfs (sdB) and M-type dwarfs (dM). Here, we obtained 33 sdB+dM eclipsing binaries based on Zwicky Transient Facility (ZTF) light curves $Gaia$ early data release 3 (EDR3) parallaxes. By using PHOEBE code for curve analysis, obtain probability distributions parameters 29 sdB+dM. $R_1$, $R_2$, $i$ are determined, average uncertainty mass ratio $q$ is 0.08. Our in good agreement with previous works if a typical sdB assumed. Based sdB+dM, find that both companion's radius $R_2$ decrease shortening orbital period. For three sdB+dMs periods less than 0.075 days, their companions all brown dwarfs. masses radii satisfy mass--radius relation low-mass stars Companions between $0.12R_\odot$ $0.15R_\odot$ seem be missing observations. As more short-period discovered classified future ZTF $Gaia$, will have information constrain ending