r-mode instability of neutron stars in low-mass X-ray binaries: effects of Fermi surface depletion and superfluidity of dense matter

doi:10.1093/mnras/staa3258

	r-mode instability of neutron stars in low-mass X-ray binaries: effects of Fermi surface depletion and superfluidity of dense matter
	Dong, J. M.1,2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2021
卷号	500 期号:1 页码:1505-1511
关键词	gravitational waves stars: neutron stars: oscillations
ISSN号	0035-8711
DOI	10.1093/mnras/staa3258
通讯作者	Dong, J. M.(dongjm07@impcas.ac.cn)
英文摘要	The nucleon-nucleon correlation between nucleons leads to the Fermi surface depletion measured by a Z-factor in momentum distribution of dense nuclear matter. The roles of the Fermi surface depletion effect (Z-factor effect) and its quenched neutron triplet superfluidity of nuclear matter in viscosity and hence in the gravitational-wave-driven r-mode instability of neutron stars (NSs) are investigated. The bulk viscosity is reduced by both the two effects, especially the superfluid effect at low temperatures which is also able to reduce the inferred core temperature of NSs. Intriguingly, due to the neutron superfluidity, the core temperature of the NSs in known low-mass X-ray binaries (LMXBs) are found to be clearly divided into two groups: high and low temperatures that correspond to NSs with short and long recurrence times for nuclear-powered bursts, respectively. Yet, a large number of NSs in these LMXBs are still located in the r-mode instability region. If the density-dependent symmetry energy is stiff enough, the occurrence of direct Urca process reduces the inferred core temperature by about one order of magnitude. Accordingly, the contradiction between the predictions and observations is alleviated to some extent, but some NSs are still located inside the unstable region.
资助项目	NationalNatural Science Foundation ofChina[11775276] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB34000000] ; Youth Innovation Promotion Association of Chinese Academy of Sciences[Y201871]
WOS关键词	GRAVITATIONAL-RADIATION ; BULK VISCOSITY ; URCA PROCESSES ; EMISSION ; CASSIOPEIA ; MAGNETARS ; AMPLITUDE ; PULSARS ; PHYSICS ; CORES
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000599134600111
资助机构	NationalNatural Science Foundation ofChina ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/138477]
专题	中国科学院近代物理研究所
通讯作者	Dong, J. M.
作者单位	1.Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Dong, J. M.. r-mode instability of neutron stars in low-mass X-ray binaries: effects of Fermi surface depletion and superfluidity of dense matter[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,500(1):1505-1511.
APA	Dong, J. M..(2021).r-mode instability of neutron stars in low-mass X-ray binaries: effects of Fermi surface depletion and superfluidity of dense matter.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,500(1),1505-1511.
MLA	Dong, J. M.."r-mode instability of neutron stars in low-mass X-ray binaries: effects of Fermi surface depletion and superfluidity of dense matter".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 500.1(2021):1505-1511.