Modelling the synchrotron light curves in recurrent novae V745 Scorpii and RS Ophiuchi

TL;DR

This paper models the synchrotron light curves of recurrent novae V745 Sco and RS Ophiuchi, explaining their radio emissions post-outburst through a combined synchrotron and thermal gas absorption model.

Contribution

It introduces a model fitting the synchrotron light curves of two recurrent novae, incorporating foreground thermal gas absorption, based on multi-frequency radio observations.

Findings

Successful fit of the 2014 V745 Sco data with the synchrotron model.

Comparison of the 2014 V745 Sco and 1985 RS Ophiuchi light curves.

Insights into the evolution of thermal gas obscuration in nova outbursts.

Abstract

In this paper, we present the synchrotron light curve at 610 MHz from the recurrent nova V745 Sco following its outburst on 6 February 2014. The system has been detected and periodically monitored with the Giant Metrewave Radio Telescope (GMRT) since 9 February 2014 as part of the Galactic Nova with GMRT (GNovaG) project. The light curves are well fit by a model of synchrotron emitting region obscured by foreground thermal gas which eventually becomes optically thin to the low GMRT frequencies. We present the model fit to the 2014 data on V745 Sco and discuss it alongwith the model fit to the 1.4 GHz data of the recurrent nova RS Ophiuchi following its outburst in 1985.