The historic Ks light curve of the FUor PGIR20dci

TL;DR

This paper presents a detailed Ks-band light curve of the FUor PGIR20dci over three decades, revealing minor pre-outburst variability, a slow initial brightening, and a rapid rise to maximum brightness.

Contribution

It provides the first long-term Ks-band observational record of PGIR20dci, capturing its variability and outburst evolution.

Findings

Minor variability before outburst

Initial slow brightness increase

Steep rise to maximum in 2019

Abstract

We report a historic Ks-band light curve spanning over three decades of the FUor PGIR20dci recently discovered by Hillenbrand et al. (2021) . We find some minor variability of the object prior to the FUor outburst, an initial rather slow rise in brightness, followed in 2019 by a much steeper rise to the maximum.