Gaia XP asteroseismic parameters

Red giants are key tracers of stellar evolution and Galactic structure, and their asteroseismic properties - particularly the large frequency separation ({DELTA}{nu}), the frequency of maximum oscillation power ({nu}max), and the dipole-mode period spacing ({DELTA}{PI}1) - provide direct insight into their internal structure, masses, and evolutionary states. Until now, seismic inferences on large stellar samples have relied primarily on high-quality light curves from missions such as Kepler and TESS or on moderate-resolution spectroscopy (LAMOST : R~1800 and APOGEE : R~22500) that clearly preserve information correlated with these seismic quantities.

With Gaia XP spectra (R~15-85), the possibility arises to obtain asteroseismic measurements of orders of magnitude more stars, despite the much lower spectral resolution. Our goal is to assess whether XP spectra retain enough information to enable reliable seismic inference for red giants. We developed hybrid convolutional neural network (CNN) - long short-term memory (LSTM) models trained on red giants with seismic parameters measured from Kepler photometry.