The two most recent thermonuclear supernovae in the Local Group: radio constraints on their progenitors and evolution

Understand

Young supernova remnants (SNRs) provide a unique perspective on supernova (SN) progenitors and connect the late evolution of SNe with the onset of the SNR phase.

• Here we study SN 1885A and G1.9+0.3, the most recent thermonuclear SNe in the Local Group (with ages $\sim 100$ years) with radio data, which provides a sensitive probe of the SN environment and energetics.
• We reduce and co-add 4-8 GHz observations from Karl G.
• Jansky Very Large Array (VLA) to produce the deepest radio image of the M31 central region (RMS noise of 1.3 $\mu$Jy/beam at 6.2 GHz).