Prospects for Galactic and stellar astrophysics with asteroseismology of giant stars in the $\it{TESS}$ Continuous Viewing Zones and beyond
Creators: name: Mackereth, J. Ted
name: Miglio, Andrea
name: Elsworth, Yvonne
name: Mosser, Benoit
name: Mathur, Savita
name: Garcia, Rafael A.
name: Nardiello, Domenico
name: Hall, Oliver J.
name: Vrard, Mathieu
name: Ball, Warrick H.
name: Basu, Sarbani
name: Beaton, Rachael L.
name: Beck, Paul G.
name: Bergemann, Maria
name: Bossini, Diego
name: Casagrande, Luca
name: Campante, Tiago L.
name: Chaplin, William J.
name: Chiappini, Christina
name: Girardi, Léo
name: Jørgensen, Andreas Christ Sølvsten
name: Khan, Saniya
name: Montalbán, Josefina
name: Nielsen, Martin B.
name: Pinsonneault, Marc H.
name: Rodrigues, Thaíse S.
name: Serenelli, Aldo
name: Aguirre, Victor Silva
name: Stello, Dennis
name: Tayar, Jamie
name: Teske, Johanna
name: van Saders, Jennifer L.
name: Willett, Emma
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The NASA-$\it{TESS}$ 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 ($G &lt; 11$) red giant stars in the $\it{TESS}$ Southern Continuous Viewing Zone (SCVZ). Using three independent pipelines, we detect $ν_{\mathrm{max}}$ and $Δν$ in 41% of the 15,405 star parent sample (6,388 stars), with consistency at a level of $\sim 2\%$ in $ν_{\mathrm{max}}$ and $\sim 5\%$ in $Δν$. Based on this, we predict that seismology will be attainable for $\sim 3\times10^{5}$ giants across the whole sky, subject to improvements in analysis and data reduction techniques. The best quality $\it{TESS}$-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 $\it{TESS}$-CVZ data with $\it{TESS}$-HERMES, $\it{SkyMapper}$, APOGEE and $\it{Gaia}$ we demonstrate the potential for Galactic archaeology studies using the data, which provides good age precision and accuracy that reproduces the age of high $\mathrm{[α/Fe]}$ stars and relationships between mass and kinematics from studies based on $\it{Kepler}$. Better quality astrometry and simpler target selection than the $\it{Kepler}$ 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]
description: 15 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