Bright but slow - Type II supernovae from OGLE-IV - Implications for magnitude limited surveys

TL;DR

This study analyzes 11 Type II supernovae from the OGLE-IV survey, revealing differences in light curve durations and brightness compared to nearby galaxy samples, impacting their use as standard candles.

Contribution

It provides new insights into the properties of Type II supernovae detected in magnitude-limited surveys, highlighting differences from previously studied samples.

Findings

Some SNe have shorter plateau phases (~70 days)

OGLE SNe are brighter than those in nearby galaxies

Magnitude-limited surveys detect different SNe populations

Abstract

We study a sample of 11 Type II supernovae (SNe) discovered by the OGLE-IV survey. All objects have well sampled I-band light curves, and at least one spectrum. We find that 2 or 3 of the 11 SNe have a declining light curve, and spectra consistent with other SNe II-L, while the rest have plateaus that can be as short as 70d, unlike the 100d typically found in nearby galaxies. The OGLE SNe are also brighter, and show that magnitude limited surveys find SNe that are different than usually found in nearby galaxies. We discuss this sample in the context of understanding Type II SNe as a class and their suggested use as standard candles.