Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical photometry and spectroscopy of the low-luminosity, broad-lined
  Ic supernova iPTF15dld   Core-collapse stripped-envelope supernova (SN) explosions reflect the
diversity of physical parameters and evolutionary paths of their massive star
progenitors. We have observed the type Ic SN iPTF15dld (z = 0.047), reported by
the Palomar Transient Factory. Spectra were taken starting 20 rest-frame days
after maximum luminosity and are affected by a young stellar population
background. Broad spectral absorption lines associated with the SN are detected
over the continuum, similar to those measured for broad-lined, highly energetic
SNe Ic. The light curve and maximum luminosity are instead more similar to
those of low luminosity, narrow-lined Ic SNe. This suggests a behavior whereby
certain highly-stripped-envelope SNe do not produce a large amount of Ni56, but
the explosion is sufficiently energetic that a large fraction of the ejecta is
accelerated to higher-than-usual velocities. We estimate SN iPTF15dld had a
main sequence progenitor of 20-25 Msun, produced a Ni56 mass of ~0.1-0.2 Msun,
had an ejecta mass of [2-10] Msun, and a kinetic energy of [1-18] e51 erg.

37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
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The categories of this paper are: eess
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
7
The categories of this paper are: hep-th
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The categories of this paper are: q-alg
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg