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Hydrodynamical simulations predict that a large amount of hydrogen (>0.1solar masses) is removed from a hydrogen-rich companion star by the SNexplosion in the single-degenerate scenario of Type Ia supernovae (SNe Ia).However, non-detection of hydrogen-rich material in the late-time spectra ofSNe Ia suggests that the hydrogen mass stripped from the progenitor system is<0.001-0.058 solar masses. In this letter we include thermohaline mixing intoself-consistent binary evolution calculations for the helium-enrichedmain-sequence (HEMS) donor channel of SNe Ia for the first time. We find thatthe swept-up hydrogen masses expected in this channel are around 0.10-0.17solar masses, which is higher than the observational limits, although thecompanion star is strongly helium-enriched when the SN explodes. This presentsa serious challenge to the HEMS donor channel.

Can the Helium-Enriched Main-Sequence Donor Scenario Hide Enough Hydrogen to Explain Type Ia Supernovae?