Building the Foundations for an APO-TESS Catalo: The APOGEE Asteroseismic Target List

Le résumé fourni par la source

The all-sky TESS mission provides an unprecedented opportunity to study the oscillations in red giants in a wide range of Milky Way stellar populations. When combined with large spectroscopic surveys, these asteroseismic measurements enable precise estimates of stellar masses, radii, and ages. Despite efforts to target asteroseismic candidates within the APOGEE DR19 survey, only 12% of red giants with literature TESS asteroseismic detections have corresponding APOGEE spectra. To investigate the cause of this disparity, we have constructed an APOGEE asteroseismic target list to identify stars with high potential for detectable oscillations. Using spectroscopic surface gravities and effective temperatures from APOGEE DR19, we estimate oscillation detection probabilities for all giant stars in the survey. For stars with detection probabilities greater than 50%, we further calculate a crowding metric to assess potential contamination arising from the large TESS pixel scale, enabling prioritisation of relatively isolated targets for future analysis. This APOGEE Asteroseismic Target List is a precursor for an APO-TESS catalog, which will build upon the successful legacies of APOKASC and APO-K2 that are widely used in Galactic archaeology studies. Preliminary estimates suggest that we will be able to seismically and spectroscopically characterise 316,000 stars in APO-TESS, which is an increase by an order of magnitude compared to the Kepler-APOGEE catalogs. This larger sample of well-characterised stars will enhance investigations of Galactic archaeology, and also allow for analyses of diverse stellar populations that were not as accessible with the small fields of view of the Kepler missions. Moreover, this work provides a valuable framework for future missions such as Roman, which is also expected to yield large seismic samples of 300,000 stars in the Galactic bulge.

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