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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.
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2012-02-01
Volume745Issue:2Pages:23-
DOI10.1088/2041-8205/745/2/L23
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Planetary Systems Stars: Individual (Ny Vir) Subdwarfs
AbstractWe 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.
Funding OrganizationChinese Natural Science Foundation [11133007, 11003040, 10878012] ; West Light Foundation of the Chinese Academy of Sciences
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN2041-8205
URL查看原文
Archive Date2012-06-29
WOS IDWOS:000300228800008
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordPRE-CATACLYSMIC BINARY ; BROWN DWARF COMPANION ; ECLIPSING SDB BINARY ; MAGNETIC BRAKING ; STELLAR EVOLUTION ; CLOSE BINARIES ; PERIOD CHANGES ; STARS ; VARIABLES ; OBJECTS
Citation statistics
Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5870
Collection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
Corresponding AuthorQian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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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