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A close-in substellar object orbiting the sdOB-type eclipsing-binary system NSVS 14256825
Zhu LY(朱俐颖)1,2,3,4; Qian SB(钱声帮)1,2,3,4; Fernandez Lajus, Eduardo5,6; Wang ZH(王志华)1,2,3,4; Li LJ(李临甲)1,2,3
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2019-09-01
卷号19期号:9页码:8
DOI10.1088/1674-4527/19/9/134
产权排序第1完成单位
收录类别SCI
关键词binaries: close binaries: eclipsing stars: evolution stars: individual (NSVS 14256825)
摘要

NSVS 14256825 is the second discovered sdOB+dM eclipsing-binary system with an orbital period of 2.65 h. This special binary was reported to contain circumbinary planets or brown dwarfs by using the timing method. However, different results were derived by different authors because of the insufficient coverage of eclipse timings. Since 2008, we have monitored this binary for about 10 yr using several telescopes and 84 new times of light minimum were obtained with high precision. It is found that the O - C curve has been increasing recently and it shows a cyclic variation with a period of 8.83 yr and an amplitude of 46.31 seconds. The cyclic change cannot be explained by magnetic activity cycles of the red dwarf component because the required energy is much larger than that radiated by this component in one whole period. This cyclic change detected in NSVS 14256825 could be explained by the light-travel time effect via the presence of a third body. The lowest mass of the third body is determined to be 14.15 M-jup which is in the transition range between planets and brown dwarfs. The substellar object is orbiting around this evolved binary at an orbital separation of around 3 AU with an eccentricity of 0.12. These results indicate that NSVS 14256825 is the first sdOB-type eclipsing binary consisting of a hierarchical substellar object. The detection of a close-in substellar companion to NSVS 14256825 will provide some insights on the formation and evolution of sdOB-type binaries and their companions.

资助项目National Natural Science Foundation of China[11573063] ; Key Science Foundation of Yunnan Province[2017FA001] ; CAS "Light of West China" Program ; CAS Interdisciplinary Innovation Team
项目资助者National Natural Science Foundation of China[11573063] ; Key Science Foundation of Yunnan Province[2017FA001] ; CAS "Light of West China" Program ; CAS Interdisciplinary Innovation Team
语种英语
学科领域天文学 ; 恒星与银河系 ; 恒星形成与演化
学科门类理学 ; 理学::天文学
文章类型Article
出版者NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
出版地20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
ISSN1674-4527
URL查看原文
WOS记录号WOS:000485147000012
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]PLANETARY SYSTEM ; MAGNETIC BRAKING ; HS 2231+2441 ; WHITE-DWARF ; PERIOD
引用统计
被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/21159
专题双星与变星研究组
中国科学院天体结构与演化重点实验室
通讯作者Zhu LY(朱俐颖)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100101, China
4.University of Chinese Academy of Sciences, Beijing 100049, China
5.Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, 1900 La Plata, Buenos Aires, Argentina
6.Instituto de Astrofisica de La Plata (CCT La Plata C CONICET/UNLP), Paseo del Bosque s/n, La Plata, BA, B1900FWA, Argentina
第一作者单位中国科学院云南天文台
通讯作者单位中国科学院云南天文台
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Zhu LY,Qian SB,Fernandez Lajus, Eduardo,et al. A close-in substellar object orbiting the sdOB-type eclipsing-binary system NSVS 14256825[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2019,19(9):8.
APA Zhu LY,Qian SB,Fernandez Lajus, Eduardo,Wang ZH,&Li LJ.(2019).A close-in substellar object orbiting the sdOB-type eclipsing-binary system NSVS 14256825.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,19(9),8.
MLA Zhu LY,et al."A close-in substellar object orbiting the sdOB-type eclipsing-binary system NSVS 14256825".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 19.9(2019):8.
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