The exceptional x-ray evolution of SN1996cr in high resolution
Jonathan Quirola  1@  
1 : Pontificia Universidad Católica de Chile

The type IIn SN1996cr, one of the five nearest SNe detected in the modern era, has been extensively observed in the X-ray band, showing an unusual light curve that increases with time, until day ~5000, similar to the famous SN1987A. This is explained by a strong interaction between the ejecta material and the CSM comprised of a dense shell. With Chandra HETG exposures in 2000, 2004, 2009 and XMM-Newton in 2001, 2013, and 2016, we resolve spectrally the velocity profiles of Hydrogen-like and Helium-like emission lines from Ne, Mg, Si, S, and Fe to monitor their evolution as tracers of the ejecta-CSM interaction. Using only the highest signal-to-noise 2009 epoch, we find that a polar geometry with two distinct opening angle configurations can successfully reproduce all of the observed line profiles. I will describe how we modeling the profiles + line strength + continuum, which requires two distinct plasmas: a cool (~2 keV) wide angle and a hot (~20 keV) narrow polar component, respectively. With this basic scenario, I will then present an extension of our analysis to other epochs with lower signal-to-noise. This SN is an excellent example of how X-ray catalogs have interesting hidden objects undiscovered.

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