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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.
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2009-11-20
Volume706Issue:1Pages:L96-L99
DOI10.1088/0004-637X/706/1/L96
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Individual (Nn Ser) White Dwarfs Stars: Low-mass Brown Dwarfs
AbstractNN 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.
Funding OrganizationChinese 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
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN2041-8205
URL查看原文
Archive Date2009-11-03
WOS IDWOS:000271533200020
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordBROWN-DWARF ; MAGNETIC BRAKING ; SERPENTIS ; EVOLUTION ; STAR ; TEMPERATURE
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5817
Collection双星与变星研究组
Corresponding AuthorQian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan 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.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
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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