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Supernova observations and the interpretation of OGLE-2013-SN-100

Sep. 17 - 14:30 - 2019

Speaker: Antonia Morales Garoffolo (University of Cádiz)

Title: Supernova observations and the interpretation of OGLE-2013-SN-100

Supernova (SN) explosions mark the endpoints in evolution of certain stars. In this talk I will review some general aspects regarding observational SN studies to later focus on a peculiar object: OGLE-2013-SN-100. The data for this transient include I-band photometry that cover ∼ 225 d of its evolution, late-time BVR-band photometry and optical spectroscopy. The object shows an unprecedented double-peaked I-band light curve (LC), with a first peak that reached −17.62 ± 0.30 mag followed by a second one ∼ 85 d later at −18.77 ± 0.30 mag. The spectra, taken after the second I-band LC peak, show little evolution, similarities to those of type Ic SNe, and signatures of mild interaction between the SN ejecta and circumstellar material. I will discuss several possible scenarios to try to explain the observable characteristics of OGLE-2013-SN-100: a) the progenitor of OGLE-2013-SN-100 suffered an eruption that produced the first peak of the LC followed by a SN explosion that gave rise to the second one , b) the transient is the result of a SN explosion plus interaction of its ejecta with circumstellar material, c) the first peak of the LC is due to a SN explosion and the second one is powered by a compact remnant (magnetar). Acknowledgement: Support provided by the Asociación Iberoamericana de Posgrado (AUIP).

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