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TWIST-INDUCED MAGNETOSPHERE RECONFIGURATION FOR INTERMITTENT PULSARS
Huang, Lei1; Yu C(余聪)2,3; Tong, Hao4
Source PublicationASTROPHYSICAL JOURNAL
2016-08-10
Volume827Issue:1
DOI10.3847/0004-637X/827/1/80
Contribution Rank第2完成单位
Indexed BySCI
KeywordInstabilities Pulsars: General Stars: Magnetars Stars: Magnetic Field Stars: Neutron
Abstract

We propose that the magnetosphere reconfiguration induced by magnetic twists in the closed field line region can account for the mode. switching of intermittent pulsars. We carefully investigate the properties of axisymmetric force-free pulsar magnetospheres with magnetic twists in closed field line regions around the polar caps. The magnetosphere with twisted closed lines leads to enhanced spin-down rates. The enhancement in spin-down rate depends on the size of the. region with twisted closed lines. Typically, it is increased by a factor of similar to 2, which is consistent with the intermittent pulsars' spin-down behavior during the "off" and "on" states. We find that. there is a threshold of maximal twist angle Delta phi(thres) similar to 1. The magnetosphere is stable only if the closed line twist angle is less than Delta phi(thres). Beyond this value, the magnetosphere becomes unstable and gets untwisted. The spin-down rate would reduce to its off-state value. The quasi-periodicity in spin-down rate change can be explained by long-term activities in the star's crust and the untwisting induced by MHD instability. The estimated duration of on-state is about 1. week, consistent with observations. Due to the MHD instability, there exists an upper limit for the spin-down ratio (f similar to 3) between the on-state and the off-state, if the Y-point remains at the light cylinder.

Funding ProjectNational Natural Science Foundation of China[11203055] ; National Natural Science Foundation of China[11173046] ; National Natural Science Foundation of China[11373064] ; National Natural Science Foundation of China[11521303] ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences[XDB09000000] ; Yunnan Natural Science Foundation[2012FB187] ; Yunnan Natural Science Foundation[2014HB048] ; Youth Innovation Promotion Association, Chinese Academy of Sciences
Funding OrganizationNational Natural Science Foundation of China[11203055, 11173046, 11373064, 11521303] ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences[XDB09000000] ; Yunnan Natural Science Foundation[2012FB187, 2014HB048] ; Youth Innovation Promotion Association, Chinese Academy of Sciences
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000382009500080
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMAGNETAR GIANT FLARES ; FLUX ROPE ERUPTIONS ; X-RAY PULSARS ; SPIN-DOWN ; CURRENT SHEETS ; NEUTRON-STARS ; RADIO ; FIELD ; B0540-69 ; BEHAVIOR
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9691
Collection大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorHuang, Lei
Affiliation1.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030, China
2.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, China
3.Key Laboratory for the Structure and Evolution of Celestial Object, Chinese Academy of Sciences, Kunming, 650011, China
4.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China
Recommended Citation
GB/T 7714
Huang, Lei,Yu C,Tong, Hao. TWIST-INDUCED MAGNETOSPHERE RECONFIGURATION FOR INTERMITTENT PULSARS[J]. ASTROPHYSICAL JOURNAL,2016,827(1).
APA Huang, Lei,Yu C,&Tong, Hao.(2016).TWIST-INDUCED MAGNETOSPHERE RECONFIGURATION FOR INTERMITTENT PULSARS.ASTROPHYSICAL JOURNAL,827(1).
MLA Huang, Lei,et al."TWIST-INDUCED MAGNETOSPHERE RECONFIGURATION FOR INTERMITTENT PULSARS".ASTROPHYSICAL JOURNAL 827.1(2016).
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