Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Type I Superluminous Supernova PS16aqv: Lightcurve Complexity and
  Deep Limits on Radioactive Ejecta in a Fast Event   [Abridged] We present UV/optical observations of PS16aqv (SN 2016ard), a Type
I superluminous supernova (SLSN-I) classified as part of our search for low-$z$
SLSNe. PS16aqv is a fast evolving SLSNe-I that reached a peak absolute
magnitude of $M_{r} \approx -22.1$. The lightcurves exhibit a significant
undulation at 30 rest-frame days after peak, with a behavior similar to
undulations seen in the slowly fading SLSN-I SN 2015bn. This similarity
strengthens the case that fast and slow SLSNe-I form a continuum with a common
origin. At $\approx\!80$ days after peak, the lightcurves exhibit a transition
to a slow decline, followed by significant subsequent steepening, indicative of
a plateau phase or a second significant undulation. Deep limits at $\approx280$
days after peak imply a tight constraint on the nickel mass, $M_{\rm Ni}
\lesssim 0.35$ M$_{\odot}$ (lower than for previous SLSNe-I), and indicate that
some SLSNe-I do not produce significantly more nickel than normal Type Ic SNe.
Using MOSFiT, we model the lightcurve with a magnetar central engine model and
find $P_{\rm spin} \approx 0.9$ ms, $B \approx 1.5 \times 10^{14}$ G, and
$M_{\rm ej} \approx 16$ M$_{\odot}$. The implied rapid spin-down time and large
reservoir of available energy coupled with the high ejecta mass may account for
the fast evolving lightcurve and slow spectroscopic evolution. We also study
the location of PS16aqv in its host galaxy and find that it occurred at an
offset of $2.46 \pm 0.21$ kpc from the central star-forming region. We find the
host galaxy exhibits low metallicity and spatially varying extinction and star
formation rate, with the explosion site exhibiting lower values than the
central region. The complexity seen in the lightcurves of PS16aqv and other
events highlights the importance of obtaining well-sampled lightcurves for
exploring deviations from a uniform decline.

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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org