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

doi:10.3847/1538-4357/aaf793

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	Diagnosing the Clumpy Protoplanetary Disk of the UXor Type Young Star GM Cephei
	Huang, P. C.1; Chen, W. P.1,2; Mugrauer, M.3,4; Bischoff, R.3,4; Budaj, J.5; Burkhonov, O.6; Ehgamberdiev, S.6; Errmann, R.7,8; Garai, Z.5; Hsiao, H. Y.1; Hu, C. L.9; Janulis, R.10; Jensen, E. L. N.11; Kiyota, S.12; Kuramoto, K.13; Lin, C. S.1; Lin, H. C.1; Liu, J. Z.14 ; Lux, O.3,4; Naito, H.15; Neuhaeuser, R.3,4; Ohlert, J.16,17; Pakstiene, E.18; Pribulla, T.5; Qvam, J. K. T.19; Raetz, St.20,21; Sato, S.22; Schwartz, M.23; Semkov, E.24,25; Takagi, S.13; Wagner, D.3,4; Watanabe, M.26; Zhang, Yu14
	2019-02-01
Source Publication	ASTROPHYSICAL JOURNAL
ISSN	0004-637X
Volume	871 Issue:2 Pages:183
Contribution Rank	13
Abstract	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.
Keyword	circumstellar matter occultations protoplanetary disks stars: individual (GM Cephei) stars: pre-main sequence stars: variables: T Tauri, Herbig Ae/Be
DOI	10.3847/1538-4357/aaf793
Indexed By	SCI
Language	英语
WOS Keyword	T-TAURI STARS ; SPECTRAL ENERGY-DISTRIBUTIONS ; BETA-PICTORIS PHENOMENON ; PHOTOPOLARIMETRIC VARIABILITY ; CIRCUMSTELLAR DISKS ; MAGNETIC ACCRETION ; DENSITY WAVES ; MASS STARS ; EVOLUTION ; ORIONIS
Funding Project	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 Research Area	Astronomy & Astrophysics
WOS Subject	Astronomy & Astrophysics
WOS ID	WOS:000457281200016
Publisher	IOP PUBLISHING LTD
Citation statistics	Cited Times:8[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.xao.ac.cn/handle/45760611-7/2451
Collection	光学天文与技术应用研究室科研仪器设备产出_利用南山1米大视场望远镜（NOWT）观测数据的文章
Corresponding Author	Huang, P. C.
Affiliation	1.Natl Cent Univ, Grad Inst Astron, 300 Zhongda Rd, Taoyuan 32001, Taiwan 2.Natl Cent Univ, Dept Phys, 300 Zhongda Rd, Taoyuan 32001, Taiwan 3.Univ Sternwarte, Astrophys Inst, Schillergasschen 2-3, D-07745 Jena, Germany 4.Univ Sternwarte, FSU Jena, Schillergasschen 2-3, D-07745 Jena, Germany 5.Slovak Acad Sci, Astron Inst, Tatranska Lomnica 05960, Slovakia 6.Uzbek Acad Sci, Ulugh Beg Astron Inst, 33 Astronomicheskaya str, Tashkent 100052, Uzbekistan 7.Univ Hertfordshire, CAR, Hatfield AL10 9AB, Herts, England 8.Friedrich Schiller Univ Jena, Abbe Ctr Photon, Max Wien Pl 1, D-07743 Jena, Germany 9.Taipei Astron Museum, 363 Jihe Rd, Taipei 11160, Taiwan 10.Vilnius Univ, Inst Theoret Phys & Astrophys, Sauletekio Av 3, LT-10257 Vilnius, Lithuania 11.Swarthmore Coll, Dept Phys & Astron, 500 Coll Ave, Swarthmore, PA 19081 USA 12.VSOLJ, 7-Kitahatsutomi, Kamagaya, Chiba 2730126, Japan 13.Hokkaido Univ, Dept Cosmosci, Kita Ku, Kita 10,Nishi 8, Sapporo, Hokkaido 0600810, Japan 14.Chinese Acad Sci, Xinjiang Observ, Natl Astron Observ, 150 Sci 1-St, Urumqi 830011, Xinjiang, Peoples R China 15.Nayoro Observ, 157-1 Nisshin, Nayoro, Hokkaido 0960066, Japan 16.Univ Appl Sci, Wilhelm Leuschner Str 13, D-61169 Friedberg, Germany 17.Astron Stiftung Trebur, Michael Adrian Observ, Fichtenstr 7, D-65768 Trebur, Germany 18.Vilnius Univ, Inst Theoret Phys & Astron, Sauletekio Av 3, LT-10257 Vilnius, Lithuania 19.Univ Oslo, Dept Phys, POB 1048, NO-0316 Oslo, Norway 20.Univ Freiburg, Freiburg Inst Adv Studies FRIAS, Albertstr 19, D-79104 Freiburg, Germany 21.Univ Tubingen, IAAT, Sand 1, D-72076 Tubingen, Germany 22.Nagoya Univ, Dept Astrophys, Nagoya, Aichi 4648602, Japan 23.Tenagra Observ, 221 Calle Coco, Rio Rico, AZ 85648 USA 24.Bulgarian Acad Sci, Inst Astron, 72 Tsarigradsko Shosse Blvd, Sofia 1784, Bulgaria 25.Bulgarian Acad Sci, Natl Astron Observ, 72 Tsarigradsko Shosse Blvd, Sofia 1784, Bulgaria 26.Okayama Univ Sci, Dept Appl Phys, Kita Ku, 1-1 Ridai Cho, Okayama, Okayama 700005, Japan
Recommended Citation GB/T 7714	Huang, P. C.,Chen, W. P.,Mugrauer, M.,et al. Diagnosing the Clumpy Protoplanetary Disk of the UXor Type Young Star GM Cephei[J]. ASTROPHYSICAL JOURNAL,2019,871(2):183.
APA	Huang, P. C..,Chen, W. P..,Mugrauer, M..,Bischoff, R..,Budaj, J..,...&Zhang, Yu.(2019).Diagnosing the Clumpy Protoplanetary Disk of the UXor Type Young Star GM Cephei.ASTROPHYSICAL JOURNAL,871(2),183.
MLA	Huang, P. C.,et al."Diagnosing the Clumpy Protoplanetary Disk of the UXor Type Young Star GM Cephei".ASTROPHYSICAL JOURNAL 871.2(2019):183.

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