Photometric observations of two type II-P Supernovae: normal SN II-P 2004A and unusual SN 2004ek

TL;DR

This study presents photometric data for two type II-P supernovae, revealing one typical and one unusual case with distinctive light curve features, contributing to understanding supernova diversity.

Contribution

It provides detailed BVRI photometry for SN 2004A and SN 2004ek, highlighting the unusual light curve behavior of SN 2004ek compared to typical SN II-P.

Findings

SN 2004A closely matches SN 1999em in light and color curves.

SN 2004ek exhibits an unusual long flat plateau and multiple peaks.

SN 2004ek's plateau luminosity is about 1.5 mag brighter than average.

Abstract

CCD BVRI photometry is presented for type II Supernovae 2004A and 2004ek. SN 2004A is found to be a typical SN II-P, with the shape of the light and color curves and maximum luminosity closely matching those for SN 1999em. SN 2004ek shows unusual light curves with long flat plateau in the B band, two peaks in the V and prominent brightening in the R and I bands, starting about 45 days past outburst. The brightness decline after the plateau stage is probably quite slow. The plateau luminosity is about 1.5 mag brighter than average for SN II-P.