Rates and delay times of Type Ia supernovae in the helium-enriched main-sequence donor scenario

TL;DR

This paper investigates the rates and delay times of Type Ia supernovae in the helium-enriched main-sequence donor scenario, incorporating thermohaline mixing, and compares theoretical predictions with observations to constrain progenitor models.

Contribution

It introduces a detailed binary evolution and population synthesis study of the HEMS donor scenario, including thermohaline mixing effects, to estimate SN Ia rates and delay times.

Findings

Galactic SN Ia rate from this scenario is 0.6-1.2 per century.

Delay times range from 0.1 to 1.0 Gyr.

Pre-explosion companion star properties are characterized.

Abstract

The nature of the progenitors of Type Ia supernovae (SNe Ia) remains a mystery. Comparing theoretical rates and delay-time distributions of SNe Ia with those inferred observationally can constrain their progenitor models. In this work, taking thermohaline mixing into account in the helium-enriched main-sequence (HEMS) donor scenario, we address rates and delay times of SNe Ia in this channel by combining the results of self-consistent binary evolution calculations with population synthesis models. We find that the Galactic SN Ia rate from the HEMS donor scenario is around 0.6-1.2 per century, which is about 30% of the observed rate. Delay times of SNe Ia in this scenario cover a wide range of 0.1-1.0 Gyr. We also present the pre-explosion properties of companion stars in the HEMS donor scenario, which will be helpful for placing constraints on SN Ia progenitors through analyzing their pre-explosion images.