DOI

https://doi.org/10.48717/1xxy-tr25

Project

EB066

Title

EB066A obs of SN2011C, 8.4 GHz

Abstract

Observations are painting a complex picture of the mass-loss at the end of the lives of massive stars. Often, mass ejections seem to occur shortly before the SN explosion, and there is considerable evidence suggesting that the mass loss is often highly anisotropic. SN2014C presents a rare opportunity to image a SN shock as it interacts with such mass loss. It exploded as a Type Ib in a low-density region, but after less than 1 yr, the SN shock began interacting with a region of dense, H-rich circumstellar medium (CSM), as evidenced by optical spectra and a sudden rise in X-ray and radio emission. SN2014C was marginally resolved in our last VLBI image at age 1057 d and showed signs of asymmetric radio emission. We propose 8 h of new VLBI observations of SN2014C with the EVN at ~1700 d, to search, with better relative resolution, for the shell structure and any asymmetry in it. Together with our already approved optical and X-ray observations we aim for a consistent physical picture of this supernova and the episodic and possibly anisotropic mass-loss of its progenitor