Prospects for Galactic and stellar astrophysics with asteroseismology of giant stars in the $TESS$ Continuous Viewing Zones and beyond

Abstract

The NASA-$TESS$ mission presents a treasure trove for understanding the stars it observes and the Milky Way, in which they reside. We present a first look at the prospects for Galactic and stellar astrophysics by performing initial asteroseismic analyses of bright ($G<11$) red giant stars in the $TESS$ Southern Continuous Viewing Zone (SCVZ). Using three independent pipelines, we detect ${\nu }_{\max }$ and $\Delta \nu$ in 41% of the 15,405 star parent sample (6,388 stars), with consistency at a level of $\sim 2\%$ in ${\nu }_{\max }$ and $\sim 5\%$ in $\Delta \nu$. Based on this, we predict that seismology will be attainable for $\sim 3\times 10^5$ giants across the whole sky, subject to improvements in analysis and data reduction techniques. The best quality $TESS$-CVZ data, for 5,574 stars where pipelines returned consistent results, provide high quality power spectra across a number of stellar evolutionary states. This makes possible studies of, for example, the Asymptotic Giant Branch bump (AGBb). We demonstrate that mixed $\ell =1$ modes and rotational splitting are cleanly observed in the 1-year data set. By combining $TESS$-CVZ data with $TESS$-HERMES, $SkyMapper$, APOGEE and $Gaia$ we demonstrate the potential for Galactic archaeology studies using the data, which provides good age precision and accuracy that reproduces the age of high $[\alpha /Fe]$ stars and relationships between mass and kinematics from studies based on $Kepler$. Better quality astrometry and simpler target selection than the $Kepler$ sample makes this data ideal for studies of the local star formation history and evolution of the Galactic disc. These results provide a strong case for detailed spectroscopic follow-up in the CVZs to complement that which has been (or will be) collected by current surveys. [Abridged]

arXiv comment15 Pages (+6 Pages Appendices), 14 Figures (+3 in Appendices). Re-submitted to MNRAS following positive initial review. Full catalogue with seismic parameters, mass and age estimates available at https://zenodo.org/record/4299142#.X8VseC2ZNNk

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