Artemis Theano Theodoridis

arXiv2026

Asteroseismically Inferred Ages of 132,000 Red Giants with TESS

NASA's TESS mission has identified at least 158,000 oscillating red giants, increasing the known sample by roughly an order of magnitude. After validating that these measurements are reliable to 5% for up to 90% of red giants (Theodoridis & Tayar 2023), we make custom stellar evolution models using MESA in order to estimate ages for ~132,794 of these stars to an average uncertainty of 23%. We show that these ages follow similar distributions to those observed in other samples such as Kepler with small differences likely resulting in the galactic volume probed. We provide these ages to the community to enable future galactic archaeology analyses.

astro-ph.SR↗

arXiv2023

Assessing the Accuracy of TESS Asteroseismology with APOGEE

The recent NASA TESS mission has the potential to increase the available asteroseismic sample dramatically, but its precision and accuracy have yet to be confirmed. To date, NASA's Kepler mission has been considered the gold standard for asteroseismic samples, despite data only being available for a small portion of the sky. TESS's observations cover the whole sky, and previous work has identified 158,000 potential red giant oscillators. Using APOGEE, which is calibrated to the asteroseismic scale of the Kepler data, we show that seismology from TESS is calibrated to the Kepler scale to better than 5% for about 90% of red giants, and has only slight trends with mass, metallicity, and surface gravity. We therefore conclude that current TESS seismic results can already be used for galactic archaeology, and future results are likely to be highly transformational to our understanding.

astro-ph.SR↗