Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraining Low-Mass White Dwarf Binaries from Ellipsoidal Variations   Stars are stretched by tidal interactions in tight binaries, and changes to
their projected areas introduce photometric variations twice per orbit. Hermes
et al. (2014, ApJ, 792, 39) utilized measurements of these ellipsoidal
variations to constrain the radii of low-mass white dwarfs in eight
single-lined spectroscopic binaries. We refine this method here, using Monte
Carlo simulations to improve constraints on many orbital and stellar properties
of binary systems that exhibit ellipsoidal variations. We analyze the recently
discovered tidally distorted white dwarf binary system SDSS J1054-2121 in
detail, and also revisit the Hermes et al. (2014) sample. Disagreements in some
cases between the observations, ellipsoidal variation model, and Gaia radius
constraints suggest that extrinsic errors are present, likely in the surface
gravities determined through model atmosphere fits to stellar spectra.

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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex