OBSERVATIONS OF DOPPLER BOOSTING IN KEPLER LIGHT CURVES

	OBSERVATIONS OF DOPPLER BOOSTING IN KEPLER LIGHT CURVES
	van Kerkwijk, MH 1,2; Rappaport, SA 3; Breton, RP 1,2; Justham, S 1; Podsiadlowski, P 4; Han ZW(韩占文)5
刊名	ASTROPHYSICAL JOURNAL
	2010-05-20
卷号	715 期号:1 页码:51-58
关键词	binaries: eclipsing stars: evolution stars: individual (KOI 74, KOI 81) techniques: photometric white dwarfs
ISSN号	0004-637X
通讯作者	van Kerkwijk, MH (reprint author), Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China.
产权排序	第五完成单位
英文摘要	Among the initial results from Kepler were two striking light curves, for KOI 74 and KOI 81, in which the relative depths of the primary and secondary eclipses showed that the more compact, less luminous object was hotter than its stellar host. That result became particularly intriguing because a substellar mass had been derived for the secondary in KOI 74, which would make the high temperature challenging to explain; in KOI 81, the mass range for the companion was also reported to be consistent with a substellar object. We re-analyze the Kepler data and demonstrate that both companions are likely to be white dwarfs. We also find that the photometric data for KOI 74 show a modulation in brightness as the more luminous star orbits, due to Doppler boosting. The magnitude of the effect is sufficiently large that we can use it to infer a radial velocity amplitude accurate to 1 km s(-1). As far as we are aware, this is the first time a radial-velocity curve has been measured photometrically. Combining our velocity amplitude with the inclination and primary mass derived from the eclipses and primary spectral type, we infer a secondary mass of 0.22 +/- 0.03 M(circle dot). We use our estimates to consider the likely evolutionary paths and mass-transfer episodes of these binary systems.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SUBDWARF-B-STARS ; X-RAY BINARIES ; LOW-MASS ; HORIZONTAL-BRANCH ; COMPANIONS ; EVOLUTION ; ROTATION ; REGULUS ; PERFORMANCE ; PULSARS
收录类别	SCI
原文出处	http://iopscience.iop.org/0004-637X/715/1/51/
语种	英语
WOS记录号	WOS:000277216100005
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4502]
专题	云南天文台_大样本恒星演化研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing, China 2.Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada 3.37-602B, MIT Department of Physics and Kavli Institute for Astrophysics and Space Research, 70 Vassar St., Cambridge, MA 02139, USA 4.Sub-department of Astrophysics, University of Oxford, Keble Road, Oxford OX1 3RH, UK 5.National Astronomical Observatories/Yunnan Observatory and Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
推荐引用方式 GB/T 7714	van Kerkwijk, MH,Rappaport, SA,Breton, RP,et al. OBSERVATIONS OF DOPPLER BOOSTING IN KEPLER LIGHT CURVES[J]. ASTROPHYSICAL JOURNAL,2010,715(1):51-58.
APA	van Kerkwijk, MH,Rappaport, SA,Breton, RP,Justham, S,Podsiadlowski, P,&Han ZW.(2010).OBSERVATIONS OF DOPPLER BOOSTING IN KEPLER LIGHT CURVES.ASTROPHYSICAL JOURNAL,715(1),51-58.
MLA	van Kerkwijk, MH,et al."OBSERVATIONS OF DOPPLER BOOSTING IN KEPLER LIGHT CURVES".ASTROPHYSICAL JOURNAL 715.1(2010):51-58.