Optical and Infrared Photometry of the Nearby SN 2017cbv

TL;DR

This paper presents early optical and infrared photometry of the nearby Type Ia supernova SN 2017cbv, analyzing its light curve, reddening, and distance using empirical and model-based methods over 68 days.

Contribution

It provides detailed photometric data and analysis of SN 2017cbv, including modeling with SALT2 and SNooPy, and estimates its distance and reddening.

Findings

SN 2017cbv has a broad light curve with Δm15(B)=0.88

Negligible host galaxy reddening (E(B-V)≈0)

Distance to SN 2017cbv is approximately 12.58 Mpc

Abstract

On 2017 March 11, the DLT40 Transient Discovery Survey discovered SN 2017cbv in NGC5643, a Type 2 Seyfert Galaxy in the Lupus Constellation. SN 2017cbv went on to become a bright Type Ia supernova, with a $V_{max}$ of 11.51 $\pm$ 0.05 mag. We present early time optical and infrared photometry of SN 2017cbv covering the rise and fall of over 68 days. We find that SN 2017cbv has a broad light curve $\Delta m_{15}(B)$ = 0.88 $\pm$ 0.07, a $B$-band maximum at 2457840.97 $\pm$ 0.43, a negligible host galaxy reddening where $E(B-V)_{host}$ $\approx$ 0, and a distance modulus of 30.49 $\pm$ 0.32 to the SN, corresponding to a distance of $12.58_{-1.71}^{+1.98}$ Mpc. We also present the results of two different numerical models we used for analysis in this paper: SALT2, an empirical model for Type Ia supernova optical light curves that accounts for variability components; and SNooPy, the CSP-II light-curve model that covers both optical and near-infrared wavelengths and is used for distance estimates.