Discovery of new TESS pulsating hot subdwarfs

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.

References in corpus (24)

• The Gaia mission
• Scaled solar tracks and isochrones in a large region of the Z-Y plane I. From the ZAMS to the TP-AGB end for 0.15 - 2.5 Mo stars
• New white dwarf stars in the Sloan Digital Sky Survey Data Release 10
• A selection of hot subluminous stars in the GALEX survey II. Subdwarf atmospheric parameters
• Hot subdwarfs from the ESO Supernova Ia Progenitor Survey: II. Atmospheric parameters of subdwarf O stars
• Modeling He-rich subdwarfs through the hot-flasher Scenario
• White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14
• The chemical diversity of exo-terrestrial planetary debris around white dwarfs
• Hot subdwarf binaries from the MUCHFUSS project - Analysis of 12 new systems and a study of the short-period binary population
• Instability strips of SPB and beta Cephei stars: the effect of the updated OP opacities and of the metal mixture
• Gravity-mode pulsations in subdwarf B stars: a critical test of stellar opacity
• Stellar atmospheric parameters for 754 spectra from the X-shooter Spectral Library
• The catalogue of radial velocity variable hot subluminous stars from the MUCHFUSS project
• Discovery of a variable lead-rich hot subdwarf: UVO 0825+15
• 3D Stellar Reddening Map from 2MASS Photometry: An Improved Version
• TESS first look at evolved compact pulsators : Discovery and asteroseismic probing of the g-mode hot B subdwarf pulsator EC 21494-7018
• Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS: I. Asteroseismology of the GW Vir stars RX J2117+3412, HS 2324+3944, NGC 6905, NGC 1501, NGC 2371, and K 1-16
• A search for variable subdwarf B stars in TESS Full Frame Images -- I. Variable objects in the southern ecliptic hemisphere
• Asteroseismic analysis of variable hot subdwarf stars observed with TESS I. The mean g-mode period spacings in hot subdwarf B stars
• A Catalog of RV Variable Star Candidates from LAMOST
• The blue-edge problem of the V1093 Her instability strip revisited using evolutionary models with atomic diffusion
• Follow-up observations of pulsating subdwarf B stars: Multisite campaigns on PG 1618+563B and PG 0048+091
• Discovery of a second pulsating intermediate helium-enriched sdOB star
• Young stars in the periphery of the Large Magellanic Cloud

Cited by in corpus (7)

• Hot subdwarfs in close binaries observed from space I: orbital, atmospheric, and absolute parameters and the nature of their companions
• A 500 pc volume-limited sample of hot subluminous stars II. Atmospheric parameters, mass distribution, and kinematics
• Pulse Timing Discovery of a Three-Day Companion to the Hot Subdwarf BPM 36430
• Discovery of periodic variables in the hot subdwarf catalogue through a systematic search in Zwicky Transient Facility data
• Hot subdwarf stars from the Hamburg Quasar Survey
• Unsupervised learning for variability detection with Gaia DR3 photometry. The main sequence-white dwarf valley
• Spectroscopic follow-up of hot subdwarf variables found in ZTF -- Atmospheric and fundamental properties of radial-mode sdB pulsators