FRA–A new fast, robust, and automated pipeline for the detection and measurement of solar‐like oscillations in time‐series photometry of red‐giant stars

Abstract

We developed, tested, and validated a new Fast, Robust, and Automated (FRA) tool to detect solar-like oscillations. FRA is based on the detection and measurement of the frequency of maximum oscillation power 𝜈 max , without relying on the detection of a regular frequency spacing to guide the search. We applied the FRA pipeline to 254 synthetic power spectra representative of red giants observed by the Transiting Exoplanet Survey Satellite (TESS), as well as 1689 red giants observed by Kepler and 2344 red giants observed by TESS. We obtain a consistency rate for 𝜈 max compared with existing measurements of ∼99% for Kepler red giants and of ∼98% for TESS red giants. We find that using 𝜈 max as an input parameter to guide the search for the large frequency separation Δ𝜈 through the existing Envelope Auto Correlation Function method significantly improves the consistency of the measured Δ𝜈 in the case of TESS stars, allowing to reach a consistency rate above 99%. Our analysis reveals that we can expect to get consistent 𝜈 max and Δ𝜈 measurements while minimizing both the false positive measurements and the non-detections for stars with a minimum of four observed sectors and a maximum G magnitude of 9.5.