Photometric observations of two type Ic-BL Supernovae: 2016coi and 2018ebt

TL;DR

This paper presents CCD BVRI photometry of two type Ic-BL supernovae, analyzing their light curves, decline rates, and host galaxy extinction, contributing to the understanding of their photometric behavior.

Contribution

It provides detailed photometric data and analysis of two Ic-BL supernovae, including light curve shapes, decline rates, and host galaxy extinction estimates.

Findings

SN 2016coi shows a change in brightness decline rate at ~100 days.

SN 2018ebt's light curves match those of SN 2002ap.

Host galaxy extinction for SN 2018ebt is negligible.

Abstract

CCD BVRI photometry is presented for the type Ic-BL Supernovae 2016coi and 2018ebt. The shape of the light curves for both objects is typical for this class of SNe. A change of brightness decline rate at about 100 days after maximum light is observed for SN 2016coi. The light curves of SN 2018ebt are best matched by those of SN Ic-BL 2002ap. For SN 2018ebt, we derived the dates and magnitudes of maximum light, rates of decline at late stages of evolution and presented evidence for extinction in the host galaxy being negligible.