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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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A radio-pulsing white dwarf binary star.

T R Marsh¹, B T Gänsicke¹, S Hümmerich^2,3

¹Department of Physics, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK.

|July 28, 2016

Summary

This summary is machine-generated.

We discovered AR Scorpii, a unique white dwarf binary system emitting across the electromagnetic spectrum. This magnetic white dwarf

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Area of Science:

* Astronomy and Astrophysics
* Compact Stars
* Binary Systems

Background:

* White dwarfs are Earth-sized, dense stellar remnants.
* Typically emit UV to near-IR radiation.
* In binaries, mass transfer can cause X-ray and IR emission, but far-IR/radio detection is rare.

Purpose of the Study:

* To report the discovery of a white dwarf/cool star binary emitting from X-ray to radio wavelengths.
* To characterize the unusual emission properties of the AR Scorpii system.

Main Methods:

* Multi-wavelength observations (X-ray to radio).
* Analysis of light curves and spectral properties.
* Determination of orbital and spin periods.

Main Results:

* Discovery of AR Scorpii, a 3.56-hour period binary system.
* Intense, rapid pulsations (1.97 min period) detected across optical and radio frequencies.
* White dwarf spin-down power significantly exceeds electromagnetic output, indicating spin-power dominance.
* Broadband spectrum consistent with synchrotron radiation, requiring relativistic electrons.

Conclusions:

* AR Scorpii is a primarily spin-powered magnetic white dwarf binary.
* Pulsations, driven by white dwarf spin, originate mainly from the cool companion star.
* Relativistic electrons are crucial for the observed synchrotron emission, likely generated near the white dwarf or at the M star.