The luminous red nova variety: AT 2020hat and AT 2020kog
A. Pastorello, G. Valerin, M. Fraser, N. Elias-Rosa, S. Valenti, A., Reguitti, P. A. Mazzali, R. C. Amaro, J. E. Andrews, Y. Dong, J. Jencson, M., Lundquist, D. E. Reichart, D. J. Sand, S. Wyatt, S. J. Smartt, K. W. Smith,, S. Srivastav, Y.-Z. Cai, E. Cappellaro, S. Holmbo

TL;DR
This paper reports detailed photometric and spectroscopic observations of two luminous red novae, AT 2020hat and AT 2020kog, revealing their light curves, spectral evolution, and progenitor characteristics, thereby enhancing understanding of LRNe phenomena.
Contribution
It provides the first comprehensive monitoring of these two LRNe, including progenitor identification and spectral evolution, highlighting differences and similarities with other LRNe and supernovae.
Findings
AT 2020kog is moderately luminous with a peak at ~7 x 10^40 erg/s.
AT 2020hat is less luminous but brighter than V838 Mon.
Spectral evolution shows transition from early supernova-like features to stellar-like spectra.
Abstract
We present the results of our monitoring campaigns of the luminous red novae (LRNe) AT 2020hat in NGC 5068 and AT 2020kog in NGC 6106. The two objects were imaged (and detected) before their discovery by routine survey operations. They show a general trend of slow luminosity rise, lasting at least a few months. The subsequent major LRN outbursts were extensively followed in photometry and spectroscopy. The light curves present an initial short-duration peak, followed by a redder plateau phase. AT 2020kog is a moderately luminous event peaking at ~7 x 10^40 erg/s, while AT 2020hat is almost one order of magnitude fainter than AT 2020kog, although it is still more luminous than V838 Mon. In analogy with other LRNe, the spectra of AT 2020kog change significantly with time. They resemble those of type IIn supernovae at early phases, then they become similar to those of K-type stars during…
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