# TESS Program G022246

Title: Know Thy Halo Stars - Know Thy Halo Planets

PI: Wang, Ji - Ohio State University

Type: SMALL

Summary: Metallicity plays a critical role in physical processes in stellar interiors, surfaces, and evolution. Equally important, metallicity also regulates planet formation. However, certain aspects of stellar physics and planet formation have never been tested at extremely low metallicity ([Fe/H]$<$-1). Halo stars---as the first generation of stars in the Milky Way--are metal-poor, providing an excellent low-metallicity laboratory for stellar physics and planet formation. Here, we propose to (1) study a ``golden" sample of halo stars---for which we will have TESS asteroseismology data---to establish an empirical relationship between photometric variability and surface gravity, i.e., a ``flicker" method in the metal-poor regime; (2) embark on a search for transiting planetary systems with the lo.


# Sector 016 targets observed (12)
173927668,350.4253,42.2378,12.39,G022246
161725619,236.8237,54.7127,12.31,G022246
155914739,221.1857,53.2913,11.38,G022246;G022232
161029755,223.2926,48.2452,10.41,G022246
161045751,223.6335,48.6046,11.43,G022246;G022232
165762922,232.0912,56.671,11.01,G022246;G022232
393893607,198.4622,45.2616,10.7,G022246
157988557,215.5561,43.3886,12.55,G022246
158023114,216.5997,42.2131,12.09,G022246
198156928,211.7381,45.9785,12.47,G022246
27350400,213.687,41.8226,12.88,G022246
393961551,212.1052,47.1859,9.04,G022246;G022103

# Sector 017 targets observed (3)
18153046,21.8488,26.8431,9.14,G022246;G022103
173927668,350.4253,42.2378,12.39,G022246
188664960,259.6389,53.0644,9.53,G022246;G022103