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A SUBSTELLAR COMPANION TO THE WHITE DWARF-RED DWARF ECLIPSING BINARY NN Ser
Qian SB(钱声帮)1,2,3; Dai ZB(戴智斌)1,2,3; Liao WP(廖文萍)1,2,3; Zhu LY(朱俐颖)1,2,3; Liu L(刘亮)1,2,3; Zhao EG(赵二刚)1,2,3; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL LETTERS
2009-11-20
卷号706期号:1页码:L96-L99
DOI10.1088/0004-637X/706/1/L96
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Stars: Individual (Nn Ser) White Dwarfs Stars: Low-mass Brown Dwarfs
摘要NN Ser is a short-period ( P = 3.12 hr) close binary containing a very hot white dwarf primary with a mass of 0.535 M(circle dot) and a fully convective secondary with a mass of 0.111 M(circle dot). The changes in the orbital period of the eclipsing binary were analyzed based on our five newly determined eclipse times together with those compiled from the literature. A small-amplitude (0.(d)00031) cyclic period variation with a period of 7.56 years was discovered to be superimposed on a possible long-term decrease. The periodic change was plausibly explained as the light-travel time effect via the presence of a tertiary companion. The mass of the tertiary companion is determined to be M(3) sin i' = 0.0107(+/- 0.0017) M(circle dot) when a total mass of 0.646 M(circle dot) for NN Ser is adopted. For orbital inclinations i' >= 49.degrees 56, the mass of the tertiary component was calculated to be M(3) <= 0.014 M(circle dot); thus it would be an extrasolar planet. The third body is orbiting the white dwarf-red dwarf eclipsing binary at a distance shorter than 3.29 AU. Since the observed decrease rate of the orbital period is about two orders larger than that caused by gravitational radiation, it can be plausibly interpreted by magnetic braking of the fully convective component, which is driving this binary to evolve into a normal cataclysmic variable.
项目资助者Chinese Natural Science Foundation [10973037, 10573032, 10778718] ; National Key Fundamental Research Project [2007CB815406] ; Yunnan Natural Science Foundation [2008CD157] ; Special Foundation of the President ; 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2009-11-03
WOS记录号WOS:000271533200020
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]BROWN-DWARF ; MAGNETIC BRAKING ; SERPENTIS ; EVOLUTION ; STAR ; TEMPERATURE
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被引频次:30[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/114a53/5817
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan 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.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, China
3.Graduate University of the Chinese Academy of Sciences, 10049 Beijing, China
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Qian SB,Dai ZB,Liao WP,et al. A SUBSTELLAR COMPANION TO THE WHITE DWARF-RED DWARF ECLIPSING BINARY NN Ser[J]. ASTROPHYSICAL JOURNAL LETTERS,2009,706(1):L96-L99.
APA Qian SB.,Dai ZB.,Liao WP.,Zhu LY.,Liu L.,...&Qian, SB .(2009).A SUBSTELLAR COMPANION TO THE WHITE DWARF-RED DWARF ECLIPSING BINARY NN Ser.ASTROPHYSICAL JOURNAL LETTERS,706(1),L96-L99.
MLA Qian SB,et al."A SUBSTELLAR COMPANION TO THE WHITE DWARF-RED DWARF ECLIPSING BINARY NN Ser".ASTROPHYSICAL JOURNAL LETTERS 706.1(2009):L96-L99.
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