2025ApJ...994..266A

Supernova (SN) 2024ggi is a nearby Type II SN discovered by the Asteroid Terrestrial-impact Last Alert System, showing early flash-ionization features. The preexplosion images reveal a red supergiant progenitor with an initial mass of 10-17 M_⊙. In the present work, we perform detailed hydrodynamic modeling to refine and put robust constraints on the progenitor and explosion parameters of SN 2024ggi. Among the progenitor models in our study, the pre-SN properties of the 11 M_⊙ match the preexplosion-detected progenitor well. However, we find it difficult to completely rule out the 10 and 12 M_⊙ models. Thus, we provide a constraint of 11${}_{-1}^{+1}$M_⊙ on the initial mass of the progenitor. To match the observed bolometric light curve and velocity evolution of SN 2024ggi, the favored model with an initial mass of 11 M_⊙has a pre-SN radius of 800 R_⊙. This model requires an explosion energy of [0.7-0.8] × 10⁵¹ erg, nickel mass of 0.049 M_⊙, ejecta mass of 9.1 M_⊙, and an amount of ∼ 0.5 M_⊙ of steady-wind circumstellar medium (CSM) extended up to ∼1.2 × 10¹⁴ cm resulting from an eruptive mass-loss rate of 1.0 M_⊙ yr^–1. We also incorporate the accelerated-wind CSM scenario, which suggests a mass-loss rate of 1.0 × 10^–2M_⊙ yr^–1 and a CSM mass of ∼0.7 M_⊙extended up to ∼1.1 × 10¹⁴ cm. This mass-loss rate falls within the range constrained observationally. Additionally, due to the constraint of 11${}_{-1}^{+1}$M_⊙ on the initial mass, the range of pre-SN radius and ejecta mass would be [690-900] R_⊙ and [8.2-9.6] M_⊙, respectively.