干旱区生态环境知识资源中心(Arid): NGTS-7Ab: an ultrashort-period brown dwarf transiting a tidally locked and active M dwarf

Arid

DOI	10.1093/mnras/stz2496
	NGTS-7Ab: an ultrashort-period brown dwarf transiting a tidally locked and active M dwarf
	Jackman, James A. G.1,2; Wheatley, Peter J.1,2; Bayliss, Dan 1,2; Gill, Samuel 1,2; Hodgkin, Simon T.3; Burleigh, Matthew R.4; Braker, Ian P.4; Gunther, Maximilian N.5,6,7; Louden, Tom 1,2; Turner, Oliver 8; Anderson, David R.1,2; Belardi, Claudia 4; Bouchy, Francois 8; Briegal, Joshua T.5; Bryant, Edward M.1,2; Cabrera, Juan 9; Casewell, Sarah L.4; Chaushev, Alexander 10; Costes, Jean C.11; Csizmadia, Szilard 9; Eigmueller, Philipp 9; Erikson, Anders 9; Gansicke, Boris T.1; Gillen, Edward 5; Goad, Michael R.4; Jenkins, James S.12,13; McCormac, James 1,2; Moyano, Maximiliano 14; Nielsen, Louise D.9; Pollacco, Don 1,2; Poppenhaeger, Katja 11,15; Queloz, Didier 5; Rauer, Heike 9,10,16; Raynard, Liam 4; Smith, Alexis M. S.9; Udry, Stephane 8; Vines, Jose I.12; Watson, Christopher A.11; West, Richard G.1,2
通讯作者	Jackman, James A. G. ; Wheatley, Peter J.
来源期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN	0035-8711
EISSN	1365-2966
出版年	2019
卷号	489 期号:4 页码:5146-5164
英文摘要	We present the discovery of NGTS-7Ab, a high-mass brown dwarf transiting an M dwarf with a period of 16.2 h, discovered as part of the Next Generation Transit Survey (NGTS). This is the shortest period transiting brown dwarf around a main or pre-main sequence star to date. The M star host (NGTS-7A) has an age of roughly 55 Myr and is in a state of spin-orbit synchronization, which we attribute to tidal interaction with the brown dwarf acting to spin-up the star. The host star is magnetically active and shows multiple flares across the NGTS and follow-up light curves, which we use to probe the flare-star-spot phase relation. The host star also has an M star companion at a separation of 1.13 arcsec with very similar proper motion and systemic velocity, suggesting that the NGTS-7 system is a hierarchical triple. The combination of tidal synchronisation and magnetic braking is expected to drive on-going decay of the brown dwarf orbit, with a remaining lifetime of only 5-10 Myr.
英文关键词	brown dwarfs stars: flare stars: individual: NGTS-7A stars: low-mass stars: rotation
类型	Article
语种	英语
国家	England ; USA ; Switzerland ; Germany ; North Ireland ; Chile
开放获取类型	Green Submitted, Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000489302400055
WOS关键词	LOW-MASS STARS ; GIANT PLANETS ; SUBSTELLAR COMPANIONS ; EVOLUTIONARY MODELS ; ECLIPSING BINARY ; LIGHT-CURVE ; ALL-SKY ; DESERT ; PERTURBATIONS ; DISCOVERY
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
EI主题词	2019-11-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310408
作者单位	1.Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England; 2.Univ Warwick, Ctr Exoplanets & Habitabil, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England; 3.Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England; 4.Univ Leicester, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England; 5.Cavendish Lab, Astrophys Grp, JJ Thomson Ave, Cambridge CB3 0HE, England; 6.MIT, Dept Phys, Cambridge, MA 02139 USA; 7.MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA; 8.Univ Geneva, Geneva Observ, Chemin Mailettes 51, CH-1290 Versoix, Switzerland; 9.German Aerosp Ctr, Inst Planetary Res, Rutherfordstr 2, D-12489 Berlin, Germany; 10.TU Berlin, Ctr Astron & Astrophys, Hardenbergstr 36, D-10623 Berlin, Germany; 11.Queens Univ Belfast, Astrophys Res Ctr, 1 Univ Rd, Belfast BT7 1NN, Antrim, North Ireland; 12.Univ Chile, Dept Astron, Casilla 36-D, Santiago, Chile; 13.CATA, Casilla 36-D, Santiago, Chile; 14.Univ Catolica Norte, Inst Astron, Angamos 0610, Antofagasta 1270709, Chile; 15.Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany; 16.FU Berlin, Inst Geol Sci, Malteserstr 74-100, D-12249 Berlin, Germany
推荐引用方式 GB/T 7714	Jackman, James A. G.,Wheatley, Peter J.,Bayliss, Dan,et al. NGTS-7Ab: an ultrashort-period brown dwarf transiting a tidally locked and active M dwarf[J],2019,489(4):5146-5164.
APA	Jackman, James A. G..,Wheatley, Peter J..,Bayliss, Dan.,Gill, Samuel.,Hodgkin, Simon T..,...&West, Richard G..(2019).NGTS-7Ab: an ultrashort-period brown dwarf transiting a tidally locked and active M dwarf.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,489(4),5146-5164.
MLA	Jackman, James A. G.,et al."NGTS-7Ab: an ultrashort-period brown dwarf transiting a tidally locked and active M dwarf".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 489.4(2019):5146-5164.