# BVRI Photometry of SN 2016coj in NGC 4125

## TL;DR

This paper presents BVRI photometry of supernova SN 2016coj, classifying it as a normal Type Ia, and provides detailed light curves, color analysis, and estimates of its peak magnitudes and extinction, despite challenges from host galaxy contamination.

## Contribution

It offers new BVRI photometric data and analysis methods for SN 2016coj, including handling host galaxy contamination and estimating its intrinsic brightness.

## Key findings

- SN 2016coj is a normal Type Ia supernova.
- Peak absolute magnitudes are estimated with low extinction.
- Host galaxy contamination affects brightness measurements.

## Abstract

We present BVRI photometry of supernova (SN) 2016coj in NGC 4125 from $9$ days before to $57$ days after its $B$-band maximum light. Our light curves and color curves suggest that this event belongs to the "normal" class of type Ia SNe, with a decline rate parameter $\Delta m_{15}(B) = 1.32 \pm 0.10$, and that it suffers little extinction. Adopting a distance modulus to its host galaxy of $(m - M) = 31.89$ mag, we compute extinction-corrected peak absolute magnitudes of $M_B = -19.01$, $M_V = -19.05$, $M_R = -19.03$, and $M_I = -18.79$. The explosion occurred close enough to the nucleus of NGC 4125 to hinder the measurement of its brightness. We describe our methods to reduce the effect of such host-galaxy contamination, but it is clear that our latest values suffer from systematic bias.