Preliminary seismic analysis of KIC11026764 with EGGMiMoSA and PORTE-CLES

Context: Owing to the detection of mixed-modes, subgiant and red-giant stars provide a unique opportunity to probe the complete stellar structure of solar-like stars and to constrain stellar structure and evolution models. KIC11026764 (Gemma) is a subgiant observed for more than 48 months with around 30 detected modes, a perfectly suited benchmark.
Aims: Using our recently developped method to analyse mixed-mode spectra, EGGMiMoSA, and aided with our local minimisation code, PORTE-CLES, we search for stellar models adjusting mixed-mode seismic indicators to precisely constraint the structure of Gemma, a milestone in the context of the PLATO mission.
Results: The present contribution represents a preliminary study of Gemma demonstrating the ability of our approach to adjust both ∆ν 0 and ∆π 1 . Refining this study, by including additional indicators (e.g. g ), will provide essential constraints on the mixing processes in subgiant stars, therefore providing clues on missing links between the main-sequence and red-giant phases.