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CIRCUMBINARY PLANETS ORBITING THE RAPIDLY PULSATING SUBDWARF B-TYPE BINARY NY Vir
Qian SB(钱声帮)1,2,3; Zhu LY(朱俐颖)1,2; Dai ZB(戴智斌)1,2; Fernandez-Lajus, E4,5; Xiang, FY6; He JJ(何家佳)1,2; Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL LETTERS
2012-02-01
卷号745期号:2页码:23-
DOI10.1088/2041-8205/745/2/L23
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Planetary Systems Stars: Individual (Ny Vir) Subdwarfs
摘要We report here the tentative discovery of a Jovian planet in orbit around the rapidly pulsating subdwarf B-type (sdB-type) eclipsing binary NY Vir. By using newly determined eclipse times together with those collected from the literature, we detect that the observed-calculated (O - C) curve of NY Vir shows a small-amplitude cyclic variation with a period of 7.9 yr and a semiamplitude of 6.1 s, while it undergoes a downward parabolic change (revealing a period decrease at a rate of (P) over dot = -9.2 x 10(-12)). The periodic variation was analyzed for the light-travel-time effect via the presence of a third body. The mass of the tertiary companion was determined to be M-3 sin i' = 2.3(+/- 0.3)M-Jupiter when a total mass of 0.60 M-circle dot for NY Vir is adopted. This suggests that it is most probably a giant circumbinary planet orbiting NY Vir at a distance of about 3.3 astronomical units (AU). Since the rate of period decrease cannot be explained by true angular momentum loss caused by gravitational radiation or/and magnetic braking, the observed downward parabolic change in the O - C diagram may be only a part of a long-period (longer than 15 years) cyclic variation, which may reveal the presence of another Jovian planet (similar to 2.5 M-Jupiter) in the system.
项目资助者Chinese Natural Science Foundation [11133007, 11003040, 10878012] ; West Light Foundation of the Chinese Academy of Sciences
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN2041-8205
URL查看原文
归档日期2012-06-29
WOS记录号WOS:000300228800008
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]PRE-CATACLYSMIC BINARY ; BROWN DWARF COMPANION ; ECLIPSING SDB BINARY ; MAGNETIC BRAKING ; STELLAR EVOLUTION ; CLOSE BINARIES ; PERIOD CHANGES ; STARS ; VARIABLES ; OBJECTS
引用统计
被引频次:39[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/114a53/5870
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Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences (CAS), P.O. Box 110, 650011 Kunming, China
2.Key laboratory of the Structure and Evolution Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
3.Physical Sciences Department, Graduate University of the Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, China
4.Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, 1900 La Plata, Buenos Aires, Argentina
5.Instituto de Astrofisica de La Plata (CCT La plata-CONICET/UNLP), Argentina
6.Physics Department, Xiangtan University, 411105 Xiangtan, Funan Province, China
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GB/T 7714
Qian SB,Zhu LY,Dai ZB,et al. CIRCUMBINARY PLANETS ORBITING THE RAPIDLY PULSATING SUBDWARF B-TYPE BINARY NY Vir[J]. ASTROPHYSICAL JOURNAL LETTERS,2012,745(2):23-.
APA Qian SB.,Zhu LY.,Dai ZB.,Fernandez-Lajus, E.,Xiang, FY.,...&Qian, SB .(2012).CIRCUMBINARY PLANETS ORBITING THE RAPIDLY PULSATING SUBDWARF B-TYPE BINARY NY Vir.ASTROPHYSICAL JOURNAL LETTERS,745(2),23-.
MLA Qian SB,et al."CIRCUMBINARY PLANETS ORBITING THE RAPIDLY PULSATING SUBDWARF B-TYPE BINARY NY Vir".ASTROPHYSICAL JOURNAL LETTERS 745.2(2012):23-.
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