BVRI Photometry of SN 2013ej in M74

TL;DR

This paper presents BVRI photometry of supernova 2013ej, estimates its distance using the expanding photosphere method, and compares photometric data with existing literature to analyze its properties.

Contribution

It combines photometric and spectroscopic data to estimate the supernova's distance and provides detailed absolute magnitudes after extinction correction.

Findings

Distance consistent with other methods

Derived absolute magnitudes for SN 2013ej

Comparison of visual and CCD measurements

Abstract

I present BVRI photometry of the type IIP supernova 2013ej in M74 from 3 to 182 days after the explosion. These photometric measurements and spectroscopic data from the literature are combined via the expanding photosphere method to estimate the distance to the event, which is consistent with that derived by other methods. After correcting for extinction and adopting a distance modulus of (m - M) = 29.80 mag to M74, I derive absolute magnitudes M_B = -17.36, M_V = -17.47, M_R = -17.64 and M_I = -17.71. The differences between visual measurements and CCD V-band measurements of SN 2013ej are similar to those determined for type Ia supernovae and ordinary stars.