Thumbnail
Access Restriction
Open

Author Chakraborti, S. ♦ Ray, A. ♦ Smith, R. ♦ Ryder, S. ♦ Yadav, N. ♦ Sutaria, F. K. ♦ Dwarkadas, V. V. ♦ Chandra, P. ♦ Pooley, D. ♦ Roy, R.
Source Indian Institute of Astrophysics
Content type Text
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics
Subject Keyword Circumstellar matter ♦ Radio continuum: general ♦ Shock waves ♦ Stars: mass-loss ♦ Supernovae: individual (SN 2011ja) ♦ X-rays: general
Description Massive stars, possibly red supergiants, which retain extended hydrogen envelopes until core collapse, produce Type II plateau (IIP) supernovae. The ejecta from these explosions shocks the circumstellar matter originating from the mass loss of the progenitor during the final phases of its life. This interaction accelerates particles to relativistic energies which then lose energy via synchrotron radiation in the shock-amplified magnetic fields and inverse Compton scattering against optical photons from the supernova. These processes produce different signatures in the radio and X-ray parts of the electromagnetic spectrum. Observed together, they allow us to break the degeneracy between shock acceleration and magnetic field amplification. In this work, we use X-rays observations from the Chandra and radio observations from the Australia Telescope Compact Array to study the relative importance of processes which accelerate particles and those which amplify magnetic fields in producing the non-thermal radiation from SN 2011ja. We use radio observations to constrain the explosion date. Multiple Chandra observations allow us to probe the history of variable mass loss from the progenitor. The ejecta expands into a low-density bubble followed by interaction with a higher density wind from a red supergiant consistent with M ZAMS gsim 12 M ☉. Our results suggest that a fraction of Type IIP supernovae may interact with circumstellar media set up by non-steady winds.
ISSN 0004637X
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Institution IOP Publishing
Journal The Astrophysical Journal
Volume Number 774
Issue Number 1
Starting Page 1