DOI

https://handle.test.datacite.org/10.82017/d519-dj96

Project

EB085

Title

EB085 obs of SN2014C, 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 can be highly anisotropic. SN2014C presents a rare opportunity to image a SN shock as it interacts with circumstellar medium (CSM) originating from such mass loss. SN 2014C 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 CSM, as evidenced by optical spectra and a sudden rise in X-ray and radio emission. Our 2018 EVN observations (age 4.8 yr) suggested a spherical shell structure, but a bipolar structure was also possible. We propose 12 h of new VLBI observations of SN2014C with the EVN at age ~7.3 yr, to search, with better relative resolution, for the shell structure and any asymmetry in it. Together with our already approved optical and existing X-ray observations we aim for a consistent physical picture of this supernova and the episodic and possibly anisotropic mass-loss of its progenitor