Abstract Details
| Name: Poonam Chandra Affiliation: NCRA-TIFR, Pune Conference ID: ASI2019_155 Title : Inhomogeneous shock structure in supernovae revealed via low frequency radio observations Authors and Co-Authors : Poonam Chandra A. J. Nayana Abstract Type : Oral Abstract Category : Extragalactic Astronomy Abstract : Low frequency radio observations with the Giant Metrewave Radio Telescope (GMRT) in some core collapse supernovae have revealed inhomogeneous shock structure. Due to these inhomogeneities, the optically thick spectra of supernovae will evolve with flatter index than of expected from the free-free or synchrotron absorption mechanisms. While this mechanism has some analogy to compact AGN cores with relatively flatter spectral indices, and has been talked about in moderate details in literature (Bjornsson 2013, Bjornsson & Keshavarzi 2017), the observations evidence has been suggested in a handful of cases only (Bjornsson 2013). I will show some examples where early GMRT observations have revealed this phenomenon directly. In particular I will talk about MASTER OT J120451.50+265946.6, a Type Ib supernova, where the radio data reveal that the radio emission is arising from a shock with inhomogeneities mainly in the magnetic field distribution (Nayana, Chandra, Bjornsson et al. 2018, accepted for publication in ApJ). I will also discuss the predictions of such models. With low frequency sensitive telescopes like SKA, upgraded GMRT, such studies will be possible for a large number of supernovae in the future. |