arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2311.09752astro-ph.SRastro-ph.GAastro-ph.IM
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半分离双星分布. I. 高效管线

The Distribution of Semi-Detached Binaries. I.An Efficient Pipeline

JianPing Xiong, Xu Ding, Jiadong Li, Hongwei Ge, Qiyuan Cheng, Kaifan Ji, Zhanwen Han, Xuefei Chen

AI总结:

本文开发并验证了结合MCMC、正演模型和DBSCAN的管线,利用TESS光变曲线和Gaia数据识别出77个半分离双星候选体,并确定其轨道参数,将星表扩大约20%,验证了样本与理论模型的一致性。

摘要:

半分离双星处于物质转移阶段,在研究相互作用双星间的物质转移物理中起着关键作用。大规模时域巡天提供了大量的双星系统光变曲线,而Gaia提供了高精度天体测量数据。本文开发、验证并应用了一条结合MCMC方法与正演模型及DBSCAN聚类的管线,用于搜寻半分离双星,并利用光变曲线估算其轨道倾角、相对半径、质量比和温度比。我们使用PHOEBE生成的模拟光变曲线训练模型,该模拟覆盖了半分离双星光变曲线的广泛情况。将我们的管线应用于TESS第1至26扇区,我们识别出77个半分离双星候选体。利用Gaia的距离,我们确定了它们的质量和半径,其中位分数不确定度分别约为26%和7%。新增的77个候选体使具有轨道参数的半分离双星星表扩大了约20%。比较和统计结果表明,我们的半分离双星候选体在Teff-L和M-R关系上与已汇编样本及PARSEC模型吻合良好。结合文献样本,与守恒物质转移稳定性判据的比较分析表明,约97.4%的样本正在进行核时标物质转移,两个样本(GO Cyg和TIC 454222105)位于动力学和热时标物质转移稳定性判据的界限内,目前正在进行热时标物质转移。此外,一个系统(IR Lyn)非常接近延迟动力学时标物质转移的上限。

英文摘要:

Semi-detached binaries are in the stage of mass transfer and play a crucial role in studying mass transfer physics between interacting binaries. Large-scale time-domain surveys provide massive light curves of binary systems, while Gaia offers high-precision astrometric data. In this paper, we develop, validate, and apply a pipeline that combines the MCMC method with a forward model and DBSCAN clustering to search for semi-detached binary and estimate its inclination, relative radius, mass ratio, and temperature ratio using light curve. We train our model on the mock light curves from PHOEBE, which provides broad coverage of light curve simulations for semi-detached binaries. Applying our pipeline to TESS sectors 1-26, we have identified 77 semi-detached binary candidates. Utilizing the distance from Gaia, we determine their masses and radii with median fractional uncertainties of ~26% and ~7%, respectively. With the added 77 candidates, the catalog of semi-detached binaries with orbital parameters has been expanded by approximately 20%. The comparison and statistical results show that our semi-detached binary candidates align well with the compiled samples and the PARSEC model in Teff-L and M-R relations. Combined with the literature samples, comparative analysis with stability criteria for conserved mass transfer indicates that ~97.4% of samples are undergoing nuclear-timescale mass transfer, and two samples (GO Cyg and TIC 454222105) are located within the limits of stability criteria for dynamical- and thermal-timescale mass transfer, which are currently undergoing thermal-timescale mass transfer. Additionally, one system (IR Lyn) is very close to the upper limit of delayed dynamical-timescale mass transfer.

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