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Volume 288 - Accretion Processes in Cosmic Sources (APCS2016) - ACCRETION ONTO WHITE DWARFS, NEUTRON STARS & BLACK HOLES
Magnetically driven transient phenomena in accretion driven systems: New breakthroughs with meerKAT and CTA?
P. Meintjes
Full text: pdf
Pre-published on: 2018 March 05
Published on: 2018 May 16
The advent of an era with more sensitive telescopes across the electromagnetic spectrum, like
e.g. meerKAT, Cherenkov Telescope Array (CTA) and the Large Synoptic Survey Telescope
(LSST), will open-up new possibilities to study faint transient phenomena in the universe. In this
study it is shown that the transient emission across the electromagnetic spectrum in nearly all
classes of accretion driven systems can be linked to magnetohydrodynamic processes, like e.g.
turbulence, magnetic reconnection, particle acceleration and non-thermal emission. The role of
turbulence and magnetic reconnection is investigated in dwarf nova eruptions, especially the role
it plays in the production of strong non-thermal synchrotron emission recently detected in these
systems. The newly detected binary white dwarf pulsar AR Scorpii (AR Sco) is also investigated.
It is shown that the strong magnetic interaction between a very highly magnetized white dwarf
and magnetic M5 secondary star can explain the total emission in this system, from radio to
possibly X-rays. The possibility is investigated whether AR Sco can be a Very High Energy
(VHE) gamma-ray source, given its proximity of about 120 pc.
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