Triggering micronovae through magnetically confined accretion flows in accreting white dwarfs

被引：10

作者：

Scaringi, S. ^{[1
]}

Groot, P. J. ^{[2
,3
,4
]}

Knigge, C. ^{[5
]}

Lasota, J-P ^{[6
,7
,8
]}

de Martino, D. ^{[9
]}

Cavecchi, Y. ^{[10
]}

Buckley, D. A. H. ^{[3
,4
,11
]}

Camisassa, M. E. ^{[12
]}

机构：

[1] Univ Durham, Ctr Extragalact Astron, Dept Phys, South Rd, Durham DH1 3LE, England

[2] Radboud Univ Nijmegen, Dept Astrophys, IMAPP, PO 9010, NL-6500 GL Nijmegen, Netherlands

[3] South African Astron Observ, POB 9, ZA-7935 Cape Town, South Africa

[4] Univ Cape Town, Dept Astron, Private Bag X3, ZA-7701 Rondebosch, South Africa

[5] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

[6] Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland

[7] CNRS, Inst Astrophys Paris, 98Bis Blvd Arago, F-75014 Paris, France

[8] Sorbonne Univ, UMR 7095, 98Bis Blvd Arago, F-75014 Paris, France

[9] INAF Osservatorio Astron Capodimonte, Salita Moiariello 16, I-80131 Naples, Italy

[10] Univ Nacl Autonoma Mexico, Inst Astron, Ciudad De Mexico 04510, Cdmx, Mexico

[11] Univ Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa

[12] Univ Colorado, Dept Appl Math, Boulder, CO 80309 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 514卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

magnetic fields; stars:; novae; cataclysmic variables; transients: novae; TV-COLUMBAE; THERMONUCLEAR RUNAWAYS; RECURRENT NOVA; OUTBURSTS; VARIABLES; BINARIES; BURSTS; MODELS;

D O I：

10.1093/mnrasl/slac042

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Rapid bursts at optical wavelengths have been reported for several accreting white dwarfs. In these bursts, the optical luminosity can increase by up to a factor of 30 in less than an hour, before fading on time-scales of several hours, and the energy release can reach similar to 10(39) erg (`micronovae'). Several systems have also shown these bursts to be semirecurrent on time-scales of days to months, and the temporal profiles of these bursts strongly resemble those observed in Type-I X-ray bursts in accreting neutron stars. It has been suggested that the observed micronovae may be the result of localized thermonuclear runaways in the surface layers of accreting white dwarfs. Here we propose a model in which the magnetic confinement of accretion streams on to the accreting magnetic white dwarf may trigger localized thermonuclear runaways. The model proposed to trigger micronovae appears to favour magnetic systems with both a high white dwarf mass and a high mass-transfer rate.

引用

页码：L11 / L15

页数：5

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