Beyond the two-infall model I. Indications for a recent gas infall with Gaia DR3 chemical abundances

Abstract

The recent Gaia Data Release 3 (DR3) represents an unparalleled revolution in Galactic Archaeology, providing us with numerous radial velocities chemical abundances for millions of stars, with all-sky coverage. We present a new chemical evolution model for the Galactic disc components (high- and low- $\alpha$ sequence stars) designed to reproduce the new abundance ratios provided by the GSP-spec module for the Gaia DR3 and also constrained by the detailed star formation histories for both the thick and thin disc stars inferred from previous Gaia releases. Sophisticated modeling based on previous Gaia releases has found evidence for narrow episodes of enhanced SF inferred in recent time. Additionally, Gaia DR3 highlighted the presence of young (massive) low-$\alpha$ disc stars which show evidence of a recent chemical impoverishment in several elements. Hence, in this study, we compare Gaia DR3 chemical abundances with the predictions of a three-infall chemical evolution model for the high- and low-$\alpha$ components. The proposed three-infall chemical evolution model nicely reproduces the main features of the abundance ratio [X/Fe] versus [M/H] (X=Mg, Si, Ca, Ti, $\alpha$) of Gaia DR3 stars in different age bins for the considered $\alpha$ elements. Moreover, the most recent gas infall - which started $\sim$ 2.7 Gyr ago - allows us to predict well the Gaia DR3 young population which has experienced a recent chemical impoverishment.

arXiv commentAccepted for publication in Astronomy and Astrophysics (A&A), 17 pages, 16 figures

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