CIRCUMBINARY PLANETS ORBITING THE RAPIDLY PULSATING SUBDWARF B-TYPE BINARY NY Vir
文献类型：期刊论文
| 作者 | 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
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
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| 出版日期 | 2012-02-01 |
| 卷号 | 745期号:2页码:23- |
| 关键词 | binaries: close binaries: eclipsing planetary systems stars: individual (NY Vir) subdwarfs |
| ISSN号 | 2041-8205 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | 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 |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/article/10.1088/2041-8205/745/2/L23/meta |
| 语种 | 英语 |
| WOS记录号 | WOS:000300228800008 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5870]  |
| 专题 | 云南天文台_双星与变星研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 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 |
| 推荐引用方式 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,&He JJ.(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-. |
入库方式： OAI收割
来源：云南天文台
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