Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Masses of White Dwarf Binary Companions to Type Ia Supernovae Measured
  from Runaway Velocities   The recently proposed "dynamically driven double-degenerate
double-detonation" (D6) scenario posits that Type Ia supernovae (SNe) may occur
during dynamically unstable mass transfer between two white dwarfs (WDs) in a
binary. This scenario predicts that the donor WD may then survive the explosion
and be released as a hypervelocity runaway, opening up the exciting possibility
of identifying remnant stars from D6 SNe and using them to study the physics of
detonations that produce Type Ia SNe. Three candidate D6 runaway objects have
been identified in Gaia data. The observable runaway velocity of these remnant
objects represents their orbital speed at the time of SN detonation. The
orbital dynamics and Roche lobe geometry required in the D6 scenario place
specific constraints on the radius and mass of the donor WD that becomes the
hypervelocity runaway. In this letter, we calculate the radii required for D6
donor WDs as a function of the runaway velocity. Using mass-radius relations
for WDs, we then constrain the masses of the donor stars as well. With measured
velocities for each of the three D6 candidate objects based on Gaia EDR3, this
work provides a new probe of the masses and mass ratios in WD binary systems
that produce SN detonations and hypervelocity runaways.

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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph