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The abundance patterns observed in the Sun and in metal-poor stars show aclear odd-even effect. An important question is whether the odd-even effect insolar-metallicity stars is similar to the Sun, or if there are variations thatcan tell us about different chemical enrichment histories. In this work, wereport for the first time observational evidence of a differential odd-eveneffect in the solar twin HIP 11915, relative to the solar odd-even abundancepattern. The spectra of this star were obtained with high resolving power (140000) and signal-to-noise ratio ($\sim$420) using the ESPRESSO spectrograph andthe VLT telescope. Thanks to the high spectral quality, we obtained extremelyprecise stellar parameters ($\sigma(T_{\rm eff})$ = 2 K, $\sigma(\rm{[Fe/H]})$= 0.003 dex, and $\sigma(\log g)$ = 0.008 dex). We determine the chemicalabundance of 20 elements ($Z\leq39$) with high precision ($\sim$0.01 dex),which shows a strong pattern of the odd-even effect even after performingGalactic Chemical Evolution corrections. The odd-even effect is reasonablywell-reproduced by a core-collapse supernova of 13 $\rm{M_{\odot}}$ andmetallicity Z = 0.001 diluted into a metal-poor gas of 1 $\rm{M_{\odot}}$. Ourresults indicate that HIP 11915 has an odd-even effect slightly different thanthe Sun, thus confirming a different supernova enrichment history.

Explosive nucleosynthesis of a metal-deficient star as the source of a distinct odd-even effect in the solar twin HIP 11915