Swift-XRT light curves of 13 Galactic novae

These shocks are also expected to heat plasma to ~10^7^K, resulting in detectable X-ray emission. In this paper, we investigate 13 {gamma}-ray emitting novae observed with the Neil Gehrels Swift Observatory, searching for 1-10keV X-ray emission concurrent with {gamma}-ray detections.

We also analyze {gamma}-ray observations of novae V407 Lup (2016) and V357 Mus (2018). We find that most novae do eventually show X-ray evidence of hot shocked plasma, but not until the {gamma}-rays have faded below detectability. We suggest that the delayed rise of the X-ray emission is due to large absorbing columns and/or X-ray suppression by corrugated shock fronts.