The ASAS-SN Bright Supernova Catalog -- V. 2018-2020

TL;DR

This paper presents a comprehensive catalog of bright supernovae discovered or recovered by ASAS-SN from 2018 to 2020, including detailed host galaxy data, light curves, and updated classifications, enhancing the understanding of supernova demographics.

Contribution

It provides an expanded, more complete supernova catalog with improved photometric and host galaxy data, increasing the sample's completeness and accuracy over previous surveys.

Findings

The catalog includes 2427 supernovae with detailed host galaxy information.

The sample is roughly complete up to peak magnitude 16.7 in the g-band.

The survey's completeness improved compared to earlier V-band results.

Abstract

We catalog the 443 bright supernovae discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) in $2018-2020$ along with the 519 supernovae recovered by ASAS-SN and 516 additional $m_{peak}\leq18$ mag supernovae missed by ASAS-SN. Our statistical analysis focuses primarily on the 984 supernovae discovered or recovered in ASAS-SN $g$-band observations. The complete sample of 2427 ASAS-SN supernovae includes earlier $V$-band samples and unrecovered supernovae. For each supernova, we identify the host galaxy, its UV to mid-IR photometry, and the offset of the supernova from the center of the host. Updated light curves, redshifts, classifications, and host galaxy identifications supersede earlier results. With the increase of the limiting magnitude to $g\leq18$ mag, the ASAS-SN sample is roughly complete up to $m_{peak}=16.7$ mag and is $90\%$ complete for $m_{peak}\leq17.0$ mag. This is an increase from the $V$-band sample where it was roughly complete up to $m_{peak}=16.2$ mag and $70\%$ complete for $m_{peak}\leq17.0$ mag.