Searching for Solar-like Oscillations Using TESS 2 minute Cadence in the Southern Ecliptic Hemisphere

Abstract The TESS space mission has generated an extensive collection of light curves, providing a valuable opportunity to search for solar-like oscillations. Numerous studies have utilized TESS observations to search for solar-like oscillations and achieved excellent results. However, the number of oscillators found by the previous works may be incomplete and significantly below the predicted count. Therefore, we employed a novel method to search for solar-like oscillations. In this work, we utilized TESS 2 minute cadence data to identify solar-like oscillators in the southern ecliptic hemisphere, detecting the presence of oscillations by identifying an excess power hump in the spectrum and combining visual inspection. As a result, we identified 10,548 stars exhibiting solar-like oscillations including 2972 that had not been reported in previous studies. The ν max and Δ ν of oscillators were determined using the fitting and autocorrelation, and the reliability of the Δ ν measurements was further evaluated using the Fourier spectrum of the autocorrelation function. Based on this assessment, 4775 oscillators were classified as having reliable Δ ν , including 1920 that have Δ ν measured for the first time.