DOI

https://doi.org/10.48717/z951-zg19

Project

RY006

Title

e-EVN: EG102E, RG009D, RSG10, RY006

Abstract

Novae may also have significant non-thermal emission from gamma-ray to radio wavelengths, produced by shocks. In the classical nova V959 Mon, the internal shocks, formed by a slow flow in the orbital plane and a fast flow in the polar direction, have been directly revealed by our multi-resolution and multi-band radio observations. To test if the two-flow model can explain the non-spherical geometry and non-thermal emission from all novae, we request the rapid e-EVN 5-GHz observations of Nova V392 Per (J0443+4721), discovered in 2018 April and the best target for the radio observations in the northern hemisphere amongst the known ~10 gamma-ray detected novae. According to our VLA monitoring observations, the new nova had a flux density of 4.5+/-0.2 mJy at 5 GHz on 2018 May 22 and a quite high brightness temperature (~4x10^5 K) very likely due to the extra contribution from the non-thermal emission. With the proposed 15 hour VLBI observations in the upcoming e-VLBI session of 2018 June 19-20, we expect to detect compact knots with a peak flux density >=40 uJy/beam (5 sigma) at the early radio brightening stage and constrain the two-flow model directly.