Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Light Curve Analysis of Gamma-ray Nova V959 Mon -- Distance and White
  Dwarf Mass   V959 Mon is one of the gamma-ray detected novae. It was optically discovered
about 50 days after the gamma-ray detection due to proximity to the Sun. The
nova speed class is unknown because of lack of the earliest half of optical
light curve and short supersoft X-ray phase due to eclipse by the disk rim.
Using the universal decline law and time-stretching method, we analyzed the
data of V959 Mon and obtained nova parameters. We estimated the distance
modulus in the V band to be (m-M)_V=13.15\pm0.3 for the reddening of
E(B-V)=0.38\pm0.01 by directly comparing with the similar type of novae, LV
Vul, V1668 Cyg, IV Cep, and V1065 Cen. The distance to V959 Mon is 2.5\pm0.5
kpc. If we assume that the early phase light curve of V959 Mon is the same as
that of time-stretched light curves of LV Vul, our model light curve fitting
suggests that the white dwarf (WD) mass is 0.9-1.15 M_sun, being consistent
with a neon nova identification. At the time of gamma-ray detection the
photosphere of nova envelope extends to 5-8 R_sun (about two or three times the
binary separation) and the wind mass-loss rate is (3-4)\times 10^{-5} M_sun
yr^{-1}. The period of hard X-ray emission is consistent with the time of
appearance of the companion star from the nova envelope. The short supersoft
X-ray turnoff time is consistent with the epoch when the WD photosphere shrank
to behind the elevating disk rim, that occurs 500 days before nuclear burning
turned off.

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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas