Light curve analysis of the hybrid sdB pulsators HS0702+6043 and HS2201+2610

TL;DR

This paper reports the discovery of low-amplitude g-modes in two hybrid sdB pulsators, expanding the known class of stars exhibiting both p- and g-mode pulsations, using wavelet-based filtering techniques.

Contribution

It introduces a wavelet-based filtering method to detect low-amplitude g-modes in sdB stars, confirming their hybrid pulsator status.

Findings

Detection of g-modes in HS0702+6043 and HS2201+2610

Expansion of known hybrid sdB pulsators

Application of wavelet filtering for asteroseismology

Abstract

We present the detection of low-amplitude, long-period g-modes in two individual sdBV stars which are known to be p-mode pulsators. Only few of these hybrid objects, showing both p- and g-modes, are known today. We resolve the g-mode domain in HS0702+6043 and add HS2201+2610 to the list of hybrid pulsators. To discover the low-amplitude g-modes, a filtering algorithm based on wavelet transformations was applied to denoise observational data.