‘Ears’ formation in supernova remnants: overhearing an interaction history with bipolar circumstellar structures

Circumstellar Nebulae in Young Supernova Remnants

Supernovae descendent from massive stars explode in media that have been modified by their progenitors’ mass loss and UV radiation. The supernova ejecta will first interact with the circumstellar material shed by the progenitors at late evolutionary stages, and then interact with the interstellar material. Circumstellar nebulae in supernova remnants can be diagnosed by their small expansion vel...

Stellar Masers, Circumstellar Envelopes, and Supernova Remnants

This paper reviews recent advances in the study or circumstellar masers and masers found toward supernova remnants. The review is organized by science focus area, including the astrophysics of extended stellar atmospheres, stellar mass-loss processes and outflows, late-type evolved stellar evolution, stellar maser excitation and chemistry, and the use of stellar masers as independent distance e...

Supernova Interaction with a Circumstellar Medium

The explosion of a core collapse supernova drives a powerful shock front into the wind from the progenitor star. A layer of shocked circumstellar gas and ejecta develops that is subject to hydrodynamic instabilities. The hot gas can be observed directly by its X-ray emission, some of which is absorbed and re-radiated at lower frequencies by the ejecta and the circumstellar gas. Synchrotron radi...

Interaction of supernova remnants: From the circumstellar medium to the terrestrial laboratory

Interaction of Supernova Blast Waves with Wind-driven Shells: Formation of ”jets”, ”bullets”, ”ears”, Etc

Most of middle-aged supernova remnants (SNRs) have a distorted and complicated appearance which cannot be explained in the framework of the Sedov-Taylor model. We consider three typical examples of such SNRs (Vela SNR, MSH15-52, G 309.200.6) and show that their structure could be explained as a result of interaction of a supernova (SN) blast wave with the ambient medium preprocessed by the acti...