The Photometric Study of EX Dra: A Dwarf Nova Exhibiting a Titled and Precessional Disk

doi:10.3847/1538-4357/ad6f97

YNAO OpenIR > 双星与变星研究组

	The Photometric Study of EX Dra: A Dwarf Nova Exhibiting a Titled and Precessional Disk
	Liu W(刘伟)1,2,3,4,5 ; Qian, Sheng-Bang 2,3; Shi XD(施相东)4,5 ; Sun QB(孙起斌)4,5 ; Fang, Xiao-Hui 6; Wang, Qi-Shan 6
发表期刊	ASTROPHYSICAL JOURNAL
	2024-10-01
卷号	974 期号:1
DOI	10.3847/1538-4357/ad6f97
产权排序	第4完成单位
收录类别	SCI
摘要	We present a photometric study of EX Dra, a dwarf nova that has been extensively observed by the Transiting Exoplanet Survey Satellite. The data reveal the occurrence of 20 complete outbursts, exhibiting several intriguing and rare characteristics. The light curves exhibit a distinct superorbital signal with a period of approximately P sor similar to 4.39(7) days, along with a negative superhump showing an approximate period of P nsh similar to 4.805(1) hr, indicating that the accretion disk is tilted and undergoing precession with the period of P sor. In addition, the time-varying nature of P sor suggests that the precession period is fluctuating.The eclipsing light minima O - C analysis during quiescence shows an oscillation with period of 3.9(5) days, which is a little shorter than the superorbital period. We contend that this is unlikely to be a sudden alteration of the orbital period, but rather, it is influenced by the tilt and precession of the accretion disk. Notably, we found an amplitude shift in the outburst behavior from 3.5 mag with a periodicity of about 26 days to an amplitude of around 2.5 mag with a periodicity of about 12 days, which persisted for 14 yr before reverting. Furthermore, we have extracted quasiperiodic oscillations in the plateau at the noneclipsed phases, characterized by periods ranging between 37 and 40 minutes.
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[12103084]; Basic research project of Yunnan Province[202301AT070352]; Natural Science Foundation of Anhui Province[2208085QA23]; NASA Science Mission Directorate
项目资助者	National Key R&D Program of China[2022YFE0116800] ; National Natural Science Foundation of China[11933008, 12103084] ; Basic research project of Yunnan Province[202301AT070352] ; Natural Science Foundation of Anhui Province[2208085QA23] ; NASA Science Mission Directorate
语种	英语
学科领域	天文学 ; 恒星与银河系
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:001329303300001
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	QUASI-PERIODIC OSCILLATIONS ; KIC 9406652 ; CATACLYSMIC VARIABLES ; ACCRETION DISCS ; TILTED DISKS ; SUPERHUMPS ; INSTABILITIES ; SIMULATIONS ; MODEL
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/114a53/27638
专题	双星与变星研究组
作者单位	1.College of Physics and Electronic Engineering, Xingtai University, Xingtai 054001, People's Republic of China; 2.Department of Astronomy, School of Physics and Astronomy, Yunnan University, Kunming 650091, People's Republic of China; [email protected]; 3.Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University, Kunming 650091, People's Republic of China; 4.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650216, People's Republic of China; 5.University of Chinese Academy of Sciences, No. 1 Yanqihu East Rd., Huairou District, Beijing 101408, People's Republic of China; 6.School of Mathematics, Physics and Finance, Anhui Polytechnic University, Wuhu 241000, People's Republic of China
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Liu W,Qian, Sheng-Bang,Shi XD,et al. The Photometric Study of EX Dra: A Dwarf Nova Exhibiting a Titled and Precessional Disk[J]. ASTROPHYSICAL JOURNAL,2024,974(1).
APA	刘伟,Qian, Sheng-Bang,施相东,孙起斌,Fang, Xiao-Hui,&Wang, Qi-Shan.(2024).The Photometric Study of EX Dra: A Dwarf Nova Exhibiting a Titled and Precessional Disk.ASTROPHYSICAL JOURNAL,974(1).
MLA	刘伟,et al."The Photometric Study of EX Dra: A Dwarf Nova Exhibiting a Titled and Precessional Disk".ASTROPHYSICAL JOURNAL 974.1(2024).

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