The First Photometric Analysis of Two Low-mass-ratio Contact Binary Systems in TESS Survey

Author:

Cheng Qiyuan,Xiong JianpingORCID,Ding XuORCID,Ji KaifanORCID,Li Jiao,Liu ChaoORCID,Li JiangdanORCID,Luo Jingxiao,Lyu XinORCID,Han ZhanwenORCID,Chen XuefeiORCID

Abstract

Abstract Low-mass-ratio (q) contact binary systems are progenitors of stellar mergers such as blue stragglers or fast-rotating FK Com stars. In this study, we present the first light curve analysis of two newly identified low mass-ratio contact binary systems, TIC 55007847 and TIC 63597006, that are identified from TESS. Both stars are classified as A-subtype contact binaries. We obtained the precise orbit periods for the two objects by using the OC method, i.e., P = 0.6117108 day for TIC 55007847 and P = 0.7008995 day for TIC 63597006, and found an obvious periodic signal in the OC curve of TIC 63597006. We suggest that the periodic signal comes from a third body. We further use the Markov chain Monte Carlo method with PHOEBE to derive the photometric solutions for the two binaries. The photometric solution for this object shows that the contribution of the third body is about 6%. Our analysis revealed that TIC 55007847 has an extremely low mass ratio of q = 0.08. By calculating the ratio of spin angular momentum to the orbital angular momentum J s/J o, we found that TIC 55007847 is very close to the instability threshold with J s/J o = 0.31, indicating that it may merge into a single, fast-rotating star in the future. For TIC 63597006, q = 0.14 and J s/J o = 0.15. This object is in a relatively stable evolutionary status at present.

Funder

MOST ∣ National Natural Science Foundation of China

MOST ∣ National Key Research and Development Program of China

Yunnan Fundamental Research Projects

International Centre of Supernovae, Yunnan Key Laboratory

Yunnan Revitalization Talent Support Program - Science and Technology Champion Project

China Manned Space Project

Publisher

American Astronomical Society

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