AR Sco: A White Dwarf Synchronar
arXiv:1609.07172 · doi:10.3847/1538-4357/835/2/150
Abstract
The emission of the white dwarf-M dwarf binary AR Sco is driven by the rapid synchronization of its white dwarf, rather than by accretion. This requires a comparatively large magnetic field gauss at the M dwarf and gauss on the white dwarf, larger than the fields of most intermediate polars but within the range of fields of known magnetic white dwarfs. The spindown power is dissipated in the atmosphere of the M dwarf by magnetic reconnection, accelerating particles that produce the observed synchrotron radiation. The displacement of the optical maximum from conjunction may be explained either by dissipation in a bow wave as the white dwarf's magnetic field sweeps past the M dwarf or by a misaligned white dwarf's rotation axis and oblique magnetic moment. In the latter case the rotation axis precesses with a period of decades, predicting a drift in the orbital phase of maximum. Binaries whose emission is powered by synchronization may be termed synchronars, in analogy to magnetars.
4 pages, 2 figures
References in corpus (3)
Cited by in corpus (26)
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- VLA Radio Observations of AR Sco
- High-Time-Resolution Photometry of AR Scorpii: Confirmation of the White Dwarf's Spin-Down
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- A reevaluation of the proposed spin-down of the white dwarf pulsar in AR Scorpii
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- Probing the Non-thermal Emission Geometry of AR Sco via Optical Phase-Resolved Polarimetry
- Optical detection of the rapidly spinning white dwarf in V1460 Her
- Magnetic interactions in orbital dynamics
- Analysis of a Century's Worth of AR Scorpii Photometry from DASCH and ASAS-SN
- Modelling the broadband emission from the white dwarf binary system AR Scorpii
- Searching for cataclysmic variable stars in unidentified X-ray sources
- Hadronic model for the non-thermal radiation from the binary system AR~Scorpii
- An X-ray study for white dwarf binary AR Scorpii
- Polarimetry of binary systems: polars, magnetic CVs, XRBs
- On the Polarized Nonthermal Emission from AR Scorpii
- Properties of white dwarf in the binary system AR Scorpii and its observed features
- VLBI astrometry on the white dwarf pulsar AR Scorpii
- Towards Modelling AR Sco: Generalised Particle Dynamics and Strong Radiation-Reaction Regimes