Triggering micronovae through magnetically confined accretion flows in accreting white dwarfs

Author:

Scaringi S1ORCID,Groot P J234,Knigge C5,Lasota J-P67ORCID,de Martino D8ORCID,Cavecchi Y9ORCID,Buckley D A H3410ORCID,Camisassa M E11

Affiliation:

1. Centre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham DH1 3LE, UK

2. Department of Astrophysics/IMAPP, Radboud University , PO 9010, 6500 GL Nijmegen, The Netherlands

3. South African Astronomical Observatory , PO Box 9, Observatory, Cape Town 7935, South Africa

4. Department of Astronomy, University of Cape Town , Private Bag X3, Rondebosch 7701, South Africa

5. School of Physics and Astronomy, University of Southampton , Highfield, Southampton SO17 1BJ, UK

6. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences , ul. Bartycka 18, 00-716 Warsaw, Poland

7. Institut d’Astrophysique de Paris, CNRS et Sorbonne Universites , UMR 7095, 98bis Boulevard Arago, 75014 Paris, France

8. INAF-Osservatorio Astronomico di Capodimonte , Salita Moiariello 16, I-80131 Naples, Italy

9. Instituto de Astronomia, Universidad Nacional Autonoma de Mexico , Ciudad de Mexico, CDMX 04510, Mexico

10. Department of Physics, University of the Free State , PO Box 339, Bloemfontein 9300, South Africa

11. Department of Applied Mathematics, University of Colorado , Boulder, CO 80309-0526, USA

Abstract

ABSTRACT 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 ~1039 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.

Funder

Italian Space Agency

National Institute for Astrophysics

NASA

University of Colorado Boulder

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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