# Type Ib supernova Master OT J120451.50+265946.6: radio emitting shock with inhomogeneities crossing through a dense shell

## TL;DR

This study presents radio observations of a Type Ib supernova revealing inhomogeneities in the shock structure crossing a dense shell, emphasizing the importance of wide-band radio data for understanding supernova emission.

## Contribution

The paper provides the first evidence of inhomogeneities in the radio-emitting region of a Type Ib supernova using multi-frequency radio observations.

## Key findings

- Inhomogeneities detected in the radio-emitting shock region.
- Shock crossing through a dense shell between 47 to 87 days.
- Model predicts smoothing of inhomogeneities at late times.

## Abstract

We present radio observations of a Type Ib supernova (SN) Master OT J120451.50+265946.6. Our low frequency Giant Metrewave Radio Telescope (GMRT) data taken when the SN was in the optically thick phase for observed frequencies reveal inhomogeneities in the structure of the radio emitting region. The high frequency Karl G. Jansky Very Large Array data indicate that the shock is crossing through a dense shell between $\sim$ 47 to $\sim 87$ days. The data $\ge 100$ days onwards are reasonably well fit with the inhomogeneous synchrotron-self absorption model. Our model predicts that the inhomogeneities should smooth out at late times. Low frequency GMRT observations at late epochs will test this prediction. Our findings suggest the importance of obtaining well-sampled wide band radio data in order to understand the intricate nature of the radio emission from young supernovae.