SN 2010kd: Photometric and Spectroscopic Analysis of a Slow-Decaying Superluminous Supernova

Abstract

This paper presents data and analysis of SN 2010kd, a low-redshift ($z=0.101$) H-deficient superluminous supernova (SLSN), based on ultraviolet/optical photometry and optical spectroscopy spanning between $-$28 and +194 days relative to $B$ band maximum light. The $B$ band light curve comparison of SN 2010kd with a subset of well-studied SLSNe I at comparable redshifts indicates that it is a slow-decaying PTF12dam like SLSN. Analytical light-curve modeling using the $\mathtt{Minim}$ code suggests that the bolometric light curve of SN 2010kd favors circumstellar matter interaction for the powering mechanism. $\mathtt{SYNAPPS}$ modeling of the early-phase spectra does not identify broad H or He lines, whereas the photospheric-phase spectra are dominated by O I, O II, C II, C IV and Si II, particularly, presence of both low and high-velocity components of O II and Si II lines. The nebular-phase spectra of SN 2010kd are dominated by O I and Ca II emission lines similar to those seen in other SLSNe I. The line velocities in SN 2010kd exhibit flatter evolution curves similar to SN 2015bn but with comparatively higher values. SN 2010kd shows a higher single-zone local thermodynamic equilibrium temperature in comparison to PTF12dam and SN 2015bn, and it has an upper O I ejected mass limit of $\sim 10M_{\odot }$. The host of SN 2010kd is a dwarf galaxy with a high star-formation rate ($\sim 0.18\pm 0.04M_{\odot }$ yr${}^{-1}$) and extreme emission lines.

arXiv comment26 pages, 16 figures, Accepted in ApJ, updated to match the accepted version

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