Diagnosing the Clumpy Protoplanetary Disk of the UXor Type Young Star GM Cephei

doi:10.3847/1538-4357/aaf793

	Diagnosing the Clumpy Protoplanetary Disk of the UXor Type Young Star GM Cephei
	Sato, S.25; Raetz, St.23,24; Qvam, J. K. T.22; Pribulla, T.13; Pakstiene, E.8; Ohlert, J.6,7; Neuhaeuser, R.12,16; Naito, H.5; Lux, O.12,16; Liu, J. Z.4
刊名	ASTROPHYSICAL JOURNAL
	2019-02-01
卷号	871 期号:2 页码:183
关键词	circumstellar matter occultations protoplanetary disks stars: individual (GM Cephei) stars: pre-main sequence stars: variables: T Tauri, Herbig Ae/Be
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaf793
产权排序	13
英文摘要	UX Orionis stars (UXors) are Herbig Ae/Be or T Tauri stars exhibiting sporadic occultation of stellar light by circumstellar dust. GM Cephei is such a UXor in the young (similar to 4 Myr) open cluster Trumpler 37, showing prominent infrared excess, emission-line spectra, and flare activity. Our photometric monitoring (2008-2018) detects (1) an similar to 3.43 day period, likely arising from rotational modulation by surface starspots, (2) sporadic brightening on timescales of days due to accretion, (3) irregular minor flux drops due to circumstellar dust extinction, and (4) major flux drops, each lasting for a couple of months with a recurrence time, though not exactly periodic, of about two years. The star experiences normal reddening by large grains, i.e., redder when dimmer, but exhibits an unusual "blueing" phenomenon in that the star turns blue near brightness minima. The maximum extinction during relatively short (lasting <= 50 days) events, is proportional to the duration, a consequence of varying clump sizes. For longer events, the extinction is independent of duration, suggestive of a transverse string distribution of clumps. Polarization monitoring indicates an optical polarization varying similar to 3%-8%, with the level anticorrelated with the slow brightness change. Temporal variation of the unpolarized and polarized light sets constraints on the size and orbital distance of the circumstellar clumps in the interplay with the young star and scattering envelope. These transiting clumps are edge-on manifestations of the ring- or spiral-like structures found recently in young stars with imaging in infrared of scattered light, or in submillimeter of thermalized dust emission.
资助项目	program of the light in China's Western Region (LCWR)[2015-XBQN-A-02] ; National Natural Science Foundation of China[11661161016] ; Thuringian State (Thuringer Ministerium fur Bildung, Wissenschaft und Kultur)[B 515-07010] ; [MOST 106-2112-M-008-005-MY3] ; [MOST 105-2119-M-008-028-MY3] ; [VEGA 2/0031/18] ; [APVV 15-0458]
WOS关键词	T-TAURI STARS ; SPECTRAL ENERGY-DISTRIBUTIONS ; BETA-PICTORIS PHENOMENON ; PHOTOPOLARIMETRIC VARIABILITY ; CIRCUMSTELLAR DISKS ; MAGNETIC ACCRETION ; DENSITY WAVES ; MASS STARS ; EVOLUTION ; ORIONIS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000457281200016
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/2450]
专题	新疆天文台_光学天文与技术应用研究室
通讯作者	Huang, P. C.
作者单位	1.Tenagra Observ, 221 Calle Coco, Rio Rico, AZ 85648 USA 2.VSOLJ, 7-Kitahatsutomi, Kamagaya, Chiba 2730126, Japan 3.Hokkaido Univ, Dept Cosmosci, Kita Ku, Kita 10,Nishi 8, Sapporo, Hokkaido 0600810, Japan 4.Chinese Acad Sci, Xinjiang Observ, Natl Astron Observ, 150 Sci 1-St, Urumqi 830011, Xinjiang, Peoples R China 5.Nayoro Observ, 157-1 Nisshin, Nayoro, Hokkaido 0960066, Japan 6.Univ Appl Sci, Wilhelm Leuschner Str 13, D-61169 Friedberg, Germany 7.Astron Stiftung Trebur, Michael Adrian Observ, Fichtenstr 7, D-65768 Trebur, Germany 8.Vilnius Univ, Inst Theoret Phys & Astron, Sauletekio Av 3, LT-10257 Vilnius, Lithuania 9.Bulgarian Acad Sci, Natl Astron Observ, 72 Tsarigradsko Shosse Blvd, Sofia 1784, Bulgaria 10.Bulgarian Acad Sci, Inst Astron, 72 Tsarigradsko Shosse Blvd, Sofia 1784, Bulgaria
推荐引用方式 GB/T 7714	Sato, S.,Raetz, St.,Qvam, J. K. T.,et al. Diagnosing the Clumpy Protoplanetary Disk of the UXor Type Young Star GM Cephei[J]. ASTROPHYSICAL JOURNAL,2019,871(2):183.
APA	Sato, S..,Raetz, St..,Qvam, J. K. T..,Pribulla, T..,Pakstiene, E..,...&Zhang, Yu.(2019).Diagnosing the Clumpy Protoplanetary Disk of the UXor Type Young Star GM Cephei.ASTROPHYSICAL JOURNAL,871(2),183.
MLA	Sato, S.,et al."Diagnosing the Clumpy Protoplanetary Disk of the UXor Type Young Star GM Cephei".ASTROPHYSICAL JOURNAL 871.2(2019):183.