A Brown Dwarf Orbiting around the Planetary-nebula Central Binary KV Vel

doi:10.3847/1538-4357/ad631a

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	A Brown Dwarf Orbiting around the Planetary-nebula Central Binary KV Vel
	Qian, S.-B.1,2; Zhu LY(朱俐颖)3,4 ; Li, F.-X.1,2; Li LJ(李临甲)3 ; Han, Z.-T.5; He JJ(何家佳)3 ; Zang, L.1,2; Chang, L.-F.1,2; Sun, Q.-B.1,2; Li, M.-Y.1,2; Zhang, H.-T.1,2; Yan, F.-Z.1,2
发表期刊	ASTROPHYSICAL JOURNAL
	2024-09-01
卷号	972 期号:1
DOI	10.3847/1538-4357/ad631a
产权排序	第3完成单位
收录类别	SCI
摘要	KV Vel is a noneclipsing short-period (P = 0.3571 days) close binary containing a very hot subdwarf primary (77,000 K) and a cool low-mass secondary star (3400 K) that is located at the center of the planetary nebula DS 1. The changes in the orbital period of the close binary were analyzed based on 262 new times of light maximum together with those compiled from the literature. It is discovered that the O - C curve shows a small-amplitude (0.(d)0034) cyclic period variation with a period of 29.55 yr. The explanation by the solar-type magnetic activity cycles of the cool component is ruled out because the required energies are much larger than the total radiant energy of this component in a whole cycle. Therefore, the cyclic variation was plausibly explained as the light-travel time effect via the presence of a tertiary component, which is supported by the periodic changes of the O - C curve and the rather symmetric and stable light curves obtained by the Transiting Exoplanet Survey Satellite. The mass of the tertiary companion is determined to be M-3 sini '=0.060(+/- 0.007) M-circle dot. If the third body is coplanar with the central binary (i.e., i '=62.degrees 5 ), the mass of the tertiary component is computed as M-3 similar to 0.068 M-circle dot, and thus it would be below the stable hydrogen-burning limit and is a brown dwarf. The orbital separation is shorter than 9.35 au. KV Vel together with its surrounding planetary nebula and the brown-dwarf companion may be formed through the common-envelope evolution after the primary filled its Roche lobe during the early asymptotic giant branch stage.
资助项目	National Key R&D Program of China[2022YFE0116800]; National Natural Science Foundation of China[11933008]; National Natural Science Foundation of China[11922306]; National Natural Science Foundation of China[11703083]; National Natural Science Foundation of China[11903076]; NASA Science Mission Directorate; TESS team
项目资助者	National Key R&D Program of China[2022YFE0116800] ; National Natural Science Foundation of China[11933008, 11922306, 11703083, 11903076] ; NASA Science Mission Directorate ; TESS team
语种	英语
学科领域	天文学
文章类型	Article
出版者	IOP Publishing Ltd
出版地	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN	0004-637X
URL	查看原文
WOS记录号	WOS:001295974100001
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	COMMON ENVELOPE BINARY ; CENTRAL STAR ; PERIOD ; VARIABILITY ; EVOLUTION
引用统计
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/27559
专题	双星与变星研究组
作者单位	1.Department of Astronomy, School of Physics and Astronomy, Yunnan University, 650091 Kunming, People's Republic of China; [email protected]; 2.Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University, 650091 Kunming, People's Republic of China; 3.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650216 Kunming, People's Republic of China; 4.University of Chinese Academy of Sciences, No. 19(A) Yuquan Road, Shijingshan District, 100049 Beijing, People's Republic of China; 5.Department of Physics, Yuxi Normal University, Phoenix Road 134, 653100 Yuxi, People's Republic of China
推荐引用方式 GB/T 7714	Qian, S.-B.,Zhu LY,Li, F.-X.,et al. A Brown Dwarf Orbiting around the Planetary-nebula Central Binary KV Vel[J]. ASTROPHYSICAL JOURNAL,2024,972(1).
APA	Qian, S.-B..,朱俐颖.,Li, F.-X..,李临甲.,Han, Z.-T..,...&Yan, F.-Z..(2024).A Brown Dwarf Orbiting around the Planetary-nebula Central Binary KV Vel.ASTROPHYSICAL JOURNAL,972(1).
MLA	Qian, S.-B.,et al."A Brown Dwarf Orbiting around the Planetary-nebula Central Binary KV Vel".ASTROPHYSICAL JOURNAL 972.1(2024).

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