Discovery of new TESS pulsating hot subdwarfs

TL;DR

This study identifies 63 new pulsating hot subdwarfs in TESS data, revealing hybrid pulsators and providing an updated catalog that enhances understanding of these stars' properties and variability.

Contribution

It presents the discovery of new pulsating hot subdwarfs, including hybrid types, and updates the catalog with detailed classifications and stellar parameters.

Findings

Identified 63 new pulsating hot subdwarfs in TESS data.

Discovered hybrid p- and g-mode pulsators across the instability strip.

Provided estimates of mean masses for different pulsator types.

Abstract

This work is dedicated to a search for new pulsating hot subdwarfs in TESS photometric data which could have been missed in previous searches. By matching catalogues of hot subdwarfs with TESS targets and using luminosities from Gaia parallaxes, a list of 1389 candidate hot subdwarfs observed by TESS was created. The periodograms of these stars were inspected, and the stars were classified according to variability type. An updated catalogue of all known pulsating hot subdwarfs is presented. A number of probable pulsating binaries have been identified, which might prove useful for verifying the asteroseismic masses. The mean masses of p- and g-mode pulsators are estimated from the stellar parameters. A list of 63 previously unknown pulsating hot subdwarfs observed by TESS is presented. More than half of the stars previously identified as pure p-mode pulsators are found to have frequencies in the g-mode region as well. As a result, hybrid p- and g-mode pulsators occur over the whole instability strip.