Séminaires

Asteroseismology with Earth 2.0: Probing Stellar Rotation and Magnetism
Gang Li (University of Southern Queensland)

Salle de réunion AGO (local -1/14), Institut d'Astrophysique et de Géophysique
Bâtiment B5c, Quartier Agora, Allée du 6 Août, 19C, B-4000 Liège 1 (Sart-Tilman)

The Earth 2.0 (ET) mission is a planned space-based telescope at the Sun–Earth L2 point, comprising six co-pointed 28-cm transit telescopes that will monitor a 550-deg² field encompassing the original Kepler field and its surroundings for four years, together with a 35-cm microlensing telescope directed toward the Galactic bulge. Its long-baseline, high-precision photometry will create new opportunities for asteroseismology across different stellar masses and evolutionary stages.

I will review recent progress in probing stellar rotation and magnetism, from main-sequence pulsators to red giants. Gravity-mode period spacings, rotational splittings, and mixed modes have revealed internal rotation profiles that are not in good agreement with current theories, posing a major challenge to our understanding of angular-momentum transport. Meanwhile, frequency asymmetries and magnetic perturbations to gravity and mixed modes are beginning to reveal kilogauss internal magnetic fields in both main-sequence stars and red giants.

Finally, I will present the current ET field of view, seismic target selection, and observing strategy. The 15-min full-frame cadence will provide long and nearly continuous light curves for large samples of pulsating stars, while high-frequency oscillations require additional high-cadence observations. With a seismic sample expected to be much larger than Kepler’s, ET will extend studies of stellar rotation and magnetism from individual benchmark stars to stellar populations.

Genesis: the ESA mission to measure Earth down to the millimeter
Gilles Wautelet (LPAP, STAR Institute, ULiège)

Salle de réunion AGO (local -1/14), Institut d'Astrophysique et de Géophysique
Bâtiment B5c, Quartier Agora, Allée du 6 Août, 19C, B-4000 Liège 1 (Sart-Tilman)

TBD