Mass transfer variation in the outburst model of dwarf novae and soft X-ray transients

TL;DR

This paper investigates mechanisms that could enhance mass transfer rates during outbursts of dwarf novae and soft X-ray transients, focusing on heating effects at the L1 point and their potential impact.

Contribution

It provides a quantitative analysis of how heating from the disc rim and scattered radiation can increase mass transfer rates, highlighting differences between dwarf novae and soft X-ray transients.

Findings

Disc edge heating has minimal effect on mass transfer in dwarf novae.

Scattered radiation from the environment can significantly increase mass transfer in soft X-ray transients.

Potential increase in mass transfer rate could be up to 100 times depending on heating efficiency.

Abstract

We discuss two mechanisms that could result in an enhancement of the mass transfer rate during outbursts of dwarf novae and soft X-ray transients: the hot outer disc rim itself could heat the L1 point and scattered radiation by optically thin outflowing matter could also heat L1 significantly. We determine quantitatively the increase of the mass transfer rate resulting from an extra heating. During outbursts, the disc edge heats up the upper layer of the secondary with a flux of the order of the intrinsic stellar flux. This probably has no large effect on the mass transfer rate. In soft X-ray transients, the environing medium of the disc (corona+wind) could back-scatter a certain fraction of the accretion luminosity toward L1. Since soft X-ray transients reach high luminosities, even a low efficiency of this effect could yield a significant heating of L1, whereas we show that in dwarf novae this effect is negligible. Initially the incoming radiation does not penetrate below the photosphere of the secondary. Depending on the heating efficiency, which has to be determined, the mass transfer rate could be significantly increased (~x100).