# The Origin of the Possible Massive Black Hole in the Progenitor System of iPTF13bvn

## TL;DR

This paper investigates the origin of a large black hole in the progenitor system of supernova iPTF13bvn, proposing it formed from a very massive star undergoing common envelope evolution, highlighting a rare evolutionary path.

## Contribution

It introduces a possible evolutionary pathway for the black hole progenitor involving a 70 solar mass star and common envelope evolution, explaining the black hole's origin.

## Key findings

- Black hole likely formed from a 70M star via common envelope evolution.
- The progenitor system's characteristics suggest a rare evolutionary scenario.
- Normal type Ib supernovae may originate from different evolutionary paths.

## Abstract

This letter complements a formation scenario of the progenitor of the supernova iPTF13bvn proposed in Hirai (2017). Although the scenario was successful in reproducing various observational features of the explosion and pre-explosion photometry by assuming that the progenitor had a relatively large black hole companion, it lacked an explanation for the origin of the black hole itself. We now explore the possible evolutionary paths towards this binary with a relatively large black hole companion. We found that the black hole was probably produced by a very massive star that experienced common envelope evolution. According to our MESA stellar models, the primary mass should have been 70M to reproduce the required remnant mass and final separation. This indicates that iPTF13bvn was likely a rare case and normal type Ib supernovae originate from different paths.