Physical Properties of 29 sdB+dM Eclipsing Binaries in Zwicky Transient Facility
Physical Properties of 29 sdB+dM Eclipsing Binaries in Zwicky Transient Facility
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Zwicky 瞬态设施中 29 sdB dM 食双星的物理特性
DOI：
10.1088/1674-4527/ac49e5
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发表时间：
2022-01
影响因子：
1.8
通讯作者：
Deng Licai
中科院分区：
文献类型：
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作者：
Dai Min;Chen Xiaodian;Wang Kun;Luo Yangping;Wang Shu;Deng Licai
大尺度时间域观测的发展为研究B型次矮星和M型矮星的物理性质和演化提供了机会。在这里，我们获得了33 sdB+dM食双星的基础上Zwicky瞬态设施（ZTF）的光变曲线和盖亚早期数据发布3（EDR 3）的视差。通过使用PHOEBE代码进行光变曲线分析，我们获得了29 sdB+dMs参数的概率分布。R_1、R_2和i得到了很好的测定，质量比q的平均不确定度为0.08。我们的参数是在良好的协议与以前的作品，如果一个典型的质量sdB的假设。根据29 sdB+dMs的参数，我们发现质量比q和伴星半径R_2都随着轨道周期的缩短而减小。对于轨道周期小于0.075天的三颗sdB+dMs，它们的伴星都是棕矮星。伴星的质量和半径满足低质量恒星和棕矮星的质量-半径关系。半径在0.12 R_∞和0.15 R_∞之间的伴星似乎在观测中缺失。随着更多的短周期sdB+dM食双星被发现，并在未来与ZTF和盖亚分类，我们将有更多的信息来约束sdB+ dM的进化结局。
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. R_1, R_2 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 R_2 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.
DOI：
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发表时间：
1998
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影响因子：
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