Thermonuclear Explosions and Accretion-induced Collapses of White Dwarfs in Active Galactic Nucleus Accretion Disks

被引:23
|
作者
Zhu, Jin-Ping [1 ]
Yang, Yuan-Pei [2 ]
Zhang, Bing [3 ]
Liu, Liang-Duan [4 ]
Yu, Yun-Wei [5 ]
Gao, He [4 ]
机构
[1] Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
[2] Yunnan Univ, South Western Inst Astron Res, Kunming, Yunnan, Peoples R China
[3] Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
[4] Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
[5] Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China
基金
美国国家科学基金会; 中国博士后科学基金; 中国国家自然科学基金;
关键词
GAMMA-RAY BURSTS; MASS BLACK-HOLES; POOR SUPERLUMINOUS SUPERNOVAE; SELF-GRAVITATING DISKS; ROTATING NEUTRON-STARS; DRIVEN SHOCK BREAKOUT; X-RAY; LIGHT CURVES; NEWLY BORN; EXTENDED EMISSION;
D O I
10.3847/2041-8213/abff5a
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
White dwarfs (WDs) embedded in the gaseous disks of active galactic nuclei (AGNs) can rapidly accrete materials from these disks and grow in mass to reach, or even exceed, the Chandrasekhar limit. Binary WD (BWD) mergers are also believed to occur in AGN accretion disks. We study observational signatures from these events. We suggest that mass-accreting WDs and BWD mergers in AGN disks can lead to thermonuclear explosions that drive an ejecta shock breakout from the disk surface and power a slow-rising, relatively dim Type Ia supernova (SN). It is possible that such SNe Ia may be outshone by the emission of the AGN disk around a supermassive black hole (BH) with a mass of M (SMBH) greater than or similar to 10(8) M (circle dot). In addition, accretion-induced collapses (AICs) of WDs in AGN disks may sometimes occur, which may form highly magnetized millisecond neutron stars (NSs). The subsequent spindown process of this nascent magnetar can deposit its rotational energy into the disk materials, resulting in a magnetar-driven shock breakout and a luminous magnetar-powered transient. We show that such an AIC event could power a rapidly evolving and luminous transient for a magnetic field of B similar to 10(15) G. The rising time and peak luminosity of the transient, powered by a magnetar with B similar to 10(14) G, are predicted to have similar properties to those of superluminous SNe. AIC events taking place in the inner parts of disks around relatively less massive supermassive BHs (M (SMBH) less than or similar to 10(8) M (circle dot)) are more likely to power transients that are much brighter than the AGN disk emission, and hence easily identified.
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页数:9
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