NSVS 11868841: An active detached eclipsing binary system with a substellar object

被引：0
作者：
Zhang, B. [1 ,2 ]
Qian, S-B [1 ,2 ,3 ,4 ,5 ,6 ]
Zhi, Q-J [1 ,2 ]
Dong, A-J [1 ,2 ]
Zhu, L-Y [3 ,4 ]
机构：
[1] Guizhou Normal Univ Guiyang, Sch Phys & Elect Sci, Guiyang 550025, Peoples R China
[2] GuiyangGuizhou Normal Univ, Guizhou Prov Key Lab Radio Astron & Data Proc, Guiyang 550025, Peoples R China
[3] Chinese Acad Sci CAS Kunming, Yunnan Observ, POB 110, Kunming 650216, Yunnan, Peoples R China
[4] KunmingChinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, POB 110, Kunming 650216, Yunnan, Peoples R China
[5] Univ Chinese Acad Sci, Yuquan Rd 19,Sijingshang Block, Beijing 100049, Peoples R China
[6] Chinese Acad Sci, Ctr Astron Megasci, 20A Datun Rd, Beijing 100012, Peoples R China
来源：
NEW ASTRONOMY | 2022年 / 91卷
基金：
中国国家自然科学基金;
关键词：
Binary; Eclipsing binary; Orbital period; Light curves; ORBITAL PERIOD MODULATION; LIGHT CURVES; EVOLUTION;
D O I：
10.1016/j.newast.2021.101678
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Four-color CCD photometric light curves (LCs) of eclipsing binary (EB) NSVS 11868841 are presented in this paper. These LCs are analyzed by using the 2013 version of the Wilson-Devinney (W-D) code. We found that NSVS 11868841 is a late-type low-mass detached EB with an orbit inclination nearly 90 degrees. The LCs are asymmetric, especially in its out-of-eclipse. Based on all available times of the light minimum, we analyzed the variations of the orbital period by using the (O-C) method. The O-C curve shows a cycle oscillation with a period of 11.83(+/- 0.04) years and an amplitude of 0.0009 days (similar to 1.3 min). This cyclic change detected in NSVS 11868841 could be explained by the light-travel time effect (LTTE) via the presence of a third body. Subsequently, we calculated the mass of this third component as M(3)sin(i(3))=0.047(+/- 0.015)M-circle dot. If the third body is coplanar with the central system, it may be a brown dwarf. And this discovery will provide important insights on the formation and evolution of brown dwarf companions.
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页数：5
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