Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comparison of the optical light curves of hydrogen-rich and
  hydrogen-poor type II supernovae   Type II supernovae (SNe II) show strong hydrogen features in their spectra
throughout their whole evolution while type IIb supernovae (SNe IIb) spectra
evolve from dominant hydrogen lines at early times to increasingly strong
helium features later on. However, it is currently unclear whether the
progenitors of these supernova (SN) types form a continuum in pre-SN hydrogen
mass or whether they are physically distinct. SN light-curve morphology
directly relates to progenitor and explosion properties such as the amount of
hydrogen in the envelope, the pre-SN radius, the explosion energy and the
synthesized mass of radioactive material. In this work we study the morphology
of the optical-wavelength light curves of hydrogen-rich SNe II and
hydrogen-poor SNe IIb to test whether an observational continuum exists between
the two. Using a sample of 95 SNe (73 SNe II and 22 SNe IIb), we define a range
of key observational parameters and present a comparative analysis between both
types. We find a lack of events that bridge the observed properties of SNe II
and SNe IIb. Light curve parameters such as rise times and post-maximum decline
rates and curvatures clearly separate both SN types and we therefore conclude
that there is no continuum, with the two SN types forming two observationally
distinct families. In the V-band a rise time of 17 days (SNe II lower, SNe IIb
higher), and a magnitude difference between 30 and 40 days post explosion of
0.4 mag (SNe II lower, SNe IIb higher) serve as approximate thresholds to
differentiate both types.

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The categories of this paper are: supr-con
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The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: eess
0
The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio