# The Peculiar Multi-Wavelength Evolution Of V1535 Sco

## TL;DR

This paper reports multi-wavelength observations of the unusual nova V1535 Sco, revealing complex shock interactions, multiple outflows, and a likely K giant companion, highlighting its peculiar evolution during the 2015 outburst.

## Contribution

It provides a detailed multi-wavelength analysis of V1535 Sco's unique evolution, including evidence of multiple shocks and outflows not previously characterized in this nova.

## Key findings

- Presence of strong shocks during first two weeks
- Evidence of multiple outflows with different velocities
- Indications of a K giant companion star

## Abstract

We present multi-wavelength observations of the unusual nova V1535 Sco throughout its outburst in 2015. Early radio observations were consistent with synchrotron emission, and early X-ray observations revealed the presence of high-energy (>1 keV) photons. These indicated that strong shocks were present during the first ~2 weeks of the nova's evolution. The radio spectral energy distribution was consistent with thermal emission from week 2 to week 6. Starting in week 7, the radio emission again showed evidence of synchrotron emission and there was an increase in X-ray emission, indicating a second shock event. The optical spectra show evidence for at least two separate outflows, with the faster outflow possibly having a bipolar morphology. The optical and near infrared light curves and the X-ray measurements of the hydrogen column density indicated that the companion star is likely a K giant.