Electron scattering wings on lines in interacting supernovae

Interacting supernovae, including type IIn and Ia-CSM, are supernovaethat show evidence of strong shock interaction between their ejectaand pre-existing circumstellar material (CSM), which may be ejectedfrom the unstable progenitor star before the explosion. After thesupernova shock wave has broken out of the progenitor star, theionizing radiation from the shock region is able to ionize thesurroundings. The CSM can have substantial optical depth to electronscattering and the continuum photosphere is in the unshocked CSM dueto the electron scattering opacity. The iconic feature of theinteracting supernovae are the broad wings (1000's of km\s) on narrowemission lines. In the talk, I'm going to explain the line formationof this feature, by adopting the idea that the narrow emissions arecreated in the preshock ionized CSM by recombination cascades, and theline profiles are broadened by the electron scattering for the photonsthat make their way out.

Speaker: 
Chen-Liang Huang (UNLV)
Location: 
KIAA, 1st meeting room
Time: 
Wed, 2018-07-04 12:00 to 13:00