Calvera: A Low-mass Strangeon Star Torqued by Debris Disk?

doi:10.3847/1538-4357/aaa671

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	Calvera: A Low-mass Strangeon Star Torqued by Debris Disk?
	Li, Yunyang 1,2; Wang, Weiyang 1,2,3,4; Ge, Mingyu 5; Liu, Xiongwei 6; Tong, Hao 7; Xu, Renxin 1,2,8
刊名	ASTROPHYSICAL JOURNAL
	2018-02-20
卷号	854 期号:2 页码:9
关键词	accretion, accretion disks pulsars: individual (Calvera1RXS J141256.0+792204) stars: neutron
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaa671
英文摘要	Calvera is a unique 59 ms isolated pulsar, because it cannot be detected by radio, optical, and gamma-rays; however, it is detectable through the purely thermal emission in soft X-rays. It is suggested that Calvera could be an ordinary middle-aged pulsar with significant magnetospheric activity at a large distance. Alternatively, it is proposed in this paper that Calvera is a low-mass strangeon star with an inactive magnetosphere (dead). In this scenario, we jointly fit the spectra obtained by the XMM-Newton Observatory and the Chandra X-ray Observatory with the strangeon star atmosphere model. The spectral model is successful in explaining the radiation properties of Calvera and X-ray dim isolated neutron stars, both of which show similar observation features. Within the dead pulsar picture, Calvera might have a high temperature at 0.67 keV, possess a small stellar radius, R less than or similar to 4 km, presumably have a small magnetic field, B less than or similar to 10(11) G, and is probably braked by the fallback disk accretion. Future advanced facilities may provide unique opportunities to understand the real nature of Calvera.
资助项目	National Key R&D Program of China[2017YFA0402600] ; National Natural Science Foundation of China[11673002] ; National Natural Science Foundation of China[U1531243] ; National Natural Science Foundation of China[U1531137] ; Strategic Priority Research Program of CAS[XDB23010200]
WOS关键词	ISOLATED NEUTRON-STARS ; X-RAY PULSARS ; 1RXS J141256.0+792204 CALVERA ; CENTRAL COMPACT OBJECTS ; SOFT GAMMA-REPEATERS ; LONG-TERM EVOLUTION ; MAGNETIC-FIELDS ; BLACK-HOLE ; SPIN-DOWN ; RADIO PULSARS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000425961400002
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of CAS ; National Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of CAS ; National Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of CAS ; National Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of CAS
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/35711]
专题	中国科学院国家天文台
通讯作者	Li, Yunyang
作者单位	1.Peking Univ, Sch Phys, Beijing 100871, Peoples R China 2.Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Computat Astrophys, Beijing 100012, Peoples R China 4.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China 6.China West Normal Univ, Sch Phys & Space Sci, Nanchong 637002, Peoples R China 7.Guangzhou Univ, Sch Phys & Elect Engn, Guangzhou 510006, Guangdong, Peoples R China 8.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Li, Yunyang,Wang, Weiyang,Ge, Mingyu,et al. Calvera: A Low-mass Strangeon Star Torqued by Debris Disk?[J]. ASTROPHYSICAL JOURNAL,2018,854(2):9.
APA	Li, Yunyang,Wang, Weiyang,Ge, Mingyu,Liu, Xiongwei,Tong, Hao,&Xu, Renxin.(2018).Calvera: A Low-mass Strangeon Star Torqued by Debris Disk?.ASTROPHYSICAL JOURNAL,854(2),9.
MLA	Li, Yunyang,et al."Calvera: A Low-mass Strangeon Star Torqued by Debris Disk?".ASTROPHYSICAL JOURNAL 854.2(2018):9.