SNe: MULTIWAVEBAND STUDIES

Chandra Cycle-5 proposal on supernova

Title

The origin of soft X-rays from radio loud supernova SN1995N

Investigators

PI: P. Chandra (Tata Institute, Mumbai \& Joint Astronomy Program, IISc., Bangalore),

Co-Is: A. Ray (Tata Inst, Mumbai), F.K. Sutaria (Tech. Univ. Munich, Germany), E. Schlegel (Center for Astrophysics, Harvard-Smithsonian Observatory, Cambridge, USA)

Abstract

The interaction of a supernova shock with its surrounding medium produces X-ray emission which also probes the environment. The soft X-rays arise either from the heating of the exploding star's ejecta by a reverse shock propagating into it, or alternatively, due to the radiative cooling of clumped, pre-existing clouds crushed by the shocked circumstellar wind. The ionized plasma emission linewidths, abundance of elements in the radiating zone and temporal evolution of the X-ray luminosity are diagnostics to discriminate between the two models. We request a 55 ksec Chandra ACIS spectroscopic observation of a radio loud, X-ray bright supernova SN1995N towards this goal. Additionally this will constrain the mass of the progenitor star by measuring the nucleosynthetic yields.

GMRT AO-4 proposal on supernova

Title

GMRT radio observations of four recently exploded core collapse supernovae.

Investigators

P. Chandra (Tata Institute, Mumbai \& Joint Astronomy Program, IISc., Bangalore), A. Ray (Tata Inst, Mumbai), S. Bhatnagar (NCRA-TIFR, Pune and NRAO, Socorro, NM, USA).

Results of a few GMRT observations

Supernovae 1993J and 1979C (in the 610 MHz and 1420 MHz bands with GMRT), -- P. Chandra, S. Bhatnagar, and A. Ray, IAU Circular No. 7657 (2001).

Supernova 2001gd in NGC 5033 -- P. Chandra, A. Ray and S. Bhatnagar IAU Circular No. 7982 (2002).

Supernova 2001ig in NGC 7424 -- P. Chandra, A. Ray and S. Bhatnagar IAU Circular No. 7994 (2002).

Supernova 2002hh in NGC 6946 -- P. Chandra, A. Ray and S. Bhatnagar IAU Circular No. 8041 (2003).