Type Ia supernova rate at a redshift of ∼0.1

We present the type la rate measurement based on two EROS supernova search campaigns (in 1999 and 2000). Sixteen supernovae identified as type la were discovered. The measurement of the detection efficiency, using a Monte Carlo simulation, provides the type la supernova explosion rate at a redshift similar to0.13. The result is 0.125(-0.034-0.028)(+0.044+0.028) h(70)(2) SNu where 1 SNu = 1 SN / 10(10) L-.(B) / century. This value is compatible with the previous EROS measurement (Hardin et al. 2000), done with a much smaller sample, at a similar redshift. Comparison with other values at different redshifts suggests an evolution of the type la supernova rate.