Abstract Details

Name: Amit Kumar
Affiliation: Aryabhatta Research Institute of Observational Sciences (ARIES)
Conference ID: ASI2021_367
Title : Photometric and spectroscopic study of H-deficient superluminous supernovae.
Authors and Co-Authors : Amit Kumar, S. B. Pandey, and Brajesh Kumar (Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital 263001, India)
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : Superluminous supernovae (SLSNe) are nearly 2-3 magnitudes brighter than the classical core-collapse SNe (CCSNe) radiating total energy of the order of 10^51 erg and exhibiting characteristic W-shaped O II features towards blue in the near-peak spectra. SLSNe are a rare class of events and were not known before SN 2005ap. They encompass ~0.01 % of normal CCSNe, and only 150 objects have been spectroscopically confirmed so far. Hydrogen deficient SLSNe (SLSNe I) appear to have slow- and fast-evolving behavior based on their different photometric and spectroscopic properties. The physical mechanisms giving rise to the high peak-luminosity feature in most of the SLSNe I remains debatable. The most trending physical mechanism of radioactive decay (RD) of Nickel-56 to explain the light-curves of H-deficient CCSNe is found to be inefficient in explaining observed high peak-luminosity in most of the SLSNe I. Various other plausible models are also proposed to explain the relatively wider and luminous bolometric light-curves of these Ultra-Violet bright cosmic events, including Circumstellar Matter Interaction (CSMI), Spin-down Millisecond Magnetar (MAG), and their possible combinations, termed as ``HYBRID'' models, e.g., CSMI+RD, CSMI+MAG, CSMI+RD+MAG. But, deeper investigations are required to explore the underlying physical mechanisms, possible progenitors and environments hosting such rare and energetic explosions. In order to understand the nature of these cosmic explosions based on the photometric and spectroscopic observations, a thorough discussion of slow evolving SLSN 2010kd and a fast-evolving SLSN 2020ank will be the main motive of the presentation.