Kavli Affiliate: Roland Vanderspek
| First 5 Authors: Tara Fetherolf, Joshua Pepper, Emilie Simpson, Stephen R. Kane, Teo Mocnik
| Summary:
During its 2-year Prime Mission, TESS observed over 232,000 stars at a 2-min
cadence across ~70% of the sky. These data provide a record of photometric
variability across a range of astrophysically interesting time scales, probing
stellar rotation, stellar binarity, and pulsations. We have analyzed the TESS
2-min light curves to identify periodic variability on timescales 0.01-13 days,
and explored the results across various stellar properties. We have identified
over 46,000 periodic variables with high confidence, and another 38,000 with
moderate confidence. These light curves show differences in variability type
across the HR diagram, with distinct groupings of rotational, eclipsing, and
pulsational variables. We also see interesting patterns across
period-luminosity space, with clear correlations between period and luminosity
for high-mass pulsators, evolved stars, and contact binary systems, a
discontinuity corresponding to the Kraft break, and a lower occurrence of
periodic variability in main-sequence stars on timescales of 1.5 to 2 days. The
variable stars identified in this work are cross-identified with several other
variability catalogs, from which we find good agreement between the measured
periods of variability. There are ~65,000 variable stars that are newly
identified in this work, which includes rotation rates of low-mass stars,
high-frequency pulsation periods for high-mass stars, and a variety of giant
star variability.
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