Astro Lunch Seminar

Speaker: Petr Baklanov (Institute for Theoretical and Experimental Physics)
Title: Radiation Hydrodynamical Model for Strongly Lensed Supernova "Refsdal" and Time-delay Measurements between its Multiple Images
Date: Tue, Feb 04, 2020, 12:00 - 13:00
Place: Seminar Room A
Related File: 2469.pdf
Abstract: In this talk I will present our results of radiation hydrodynamics simulations of the unique supernova (SN) ``Refsdal'' - the first discovered strongly lensed supernova with four clearly resolved images. The SN images looked like a well-known quasar ``Einstein cross''.
A large magnification provided by a cluster-scale lens for the first time gave us the opportunity to perform a detailed simulations of a distant SN at z = 1.5. According to our modelling, the SN ``Refsdal''
is a more massive and energetic version of SN 1987A. The progenitor of SN ``Refsdal'' is a blue supergiant star with a radius of R = 50 Rsun, a total mass of M = 26 Msun and a radioactive Ni56 mass of 0.245 Msun.
The explosion energy is E = 5 x 10^51 erg.
The reconstruction of the SN light curves allows us to estimate time delays and magnifications for the four images S1-S4 relative to S1 with higher accuracy than previous estimates of Rodney et al (2016).
These measurements not only constrain cluster lens models but also provide a direct measurement of the Hubble constant.