Magnetars as Powering Sources of GammaRay Burst Associated Supernovae, and Unsupervised Clustering of Cosmic Explosions
Abstract
We present the semianalytical light curve modelling of 13 supernovae associated with gammaray bursts (GRBSNe) along with two relativistic broadlined (IcBL) SNe without GRBs association (SNe 2009bb and 2012ap), considering millisecond magnetars as centralenginebased power sources for these events. The bolometric light curves of all 15 SNe in our sample are wellregenerated utilising a $\chi^2$minimisation code, $\texttt{MINIM}$, and numerous parameters are constrained. The median values of ejecta mass ($M_{\textrm{ej}}$), magnetar's initial spin period ($P_\textrm{i}$) and magnetic field ($B$) for GRBSNe are determined to be $\approx$ 5.2 M$_\odot$, 20.5 ms and 20.1 $\times$ 10$^{14}$ G, respectively. We leverage machine learning (ML) algorithms to comprehensively compare the 3dimensional parameter space encompassing $M_{\textrm{ej}}$, $P_\textrm{i}$, and $B$ for GRBSNe determined herein to those of Hdeficient superluminous SNe (SLSNeI), fast blue optical transients (FBOTs), long GRBs (LGRBs), and short GRBs (SGRBs) obtained from the literature. The application of unsupervised ML clustering algorithms on the parameters $M_{\textrm{ej}}$, $P_\textrm{i}$, and $B$ for GRBSNe, SLSNeI, and FBOTs yields a classification accuracy of $\sim$95%. Extending these methods to classify GRBSNe, SLSNeI, LGRBs, and SGRBs based on $P_\textrm{i}$ and $B$ values results in an accuracy of $\sim$84%. Our investigations show that GRBSNe and relativistic IcBL SNe presented in this study occupy different parameter spaces for $M_{\textrm{ej}}$, $P_\textrm{i}$, and $B$ than those of SLSNeI, FBOTs, LGRBs and SGRBs. This indicates that magnetars with different $P_\textrm{i}$ and $B$ can give birth to distinct types of transients.
 Publication:

arXiv eprints
 Pub Date:
 March 2024
 DOI:
 10.48550/arXiv.2403.18076
 arXiv:
 arXiv:2403.18076
 Bibcode:
 2024arXiv240318076K
 Keywords:

 Astrophysics  High Energy Astrophysical Phenomena
 EPrint:
 13 pages, 7 figures, and 3 tables (including appendix). Accepted for publication in MNRAS