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Weikai Zong, Stéphane Charpinet, Gérard Vauclair, Jian-Ning Fu & Xiao-Yu Ma

The cradle of nonlinear asteroseismology: observations of oscillation mode variability in compact pulsating stars

(Volume 92 - Année 2023 — Numéro 2 - Proceedings of the 10th Meeting on Hot Subdwarfs and Related Objects)
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Abstract

We briefly review progress in developing a pathway to nonlinear astereoseismology, both from theoretical and observational aspects. As predicted by the theory of weak nonlinear interactions between resonant modes, their amplitude and frequency can be modulated according to various kinds of patterns. However, those subtle modulations could hardly be well characterized from ground-based photometric monitoring. The Kepler spacecraft offered a new window to find clear-cut evidence of well-determined amplitude and frequency modulations, leading to the first discoveries of such variations in pulsating white dwarf and hot B subdwarf stars. Fol-lowing that direction, a systematic survey of oscillation mode properties in compact pulsators monitored by Kepler suggests that mode variability is likely a common phenomenon, which remain unaccounted for by standard linear non-radial pulsation theory. To reach this conclusion firmly, the survey has now been extended to a larger context including compact stars observed by K2 and TESS. We expect that this extended survey will help to constrain key parameters governing weak nonlinear effects in stellar oscillations.

Keywords : nonlinear theory, amplitude modulation, frequency modulation, hot B subdwarfs, white dwarfs

To cite this article

Weikai Zong, Stéphane Charpinet, Gérard Vauclair, Jian-Ning Fu & Xiao-Yu Ma, «The cradle of nonlinear asteroseismology: observations of oscillation mode variability in compact pulsating stars», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 92 - Année 2023, Numéro 2 - Proceedings of the 10th Meeting on Hot Subdwarfs and Related Objects, 126-133 URL : https://popups.uliege.be/0037-9565/index.php?id=11305.

About: Weikai Zong

Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing 102206, China and Department of Astronomy, Beijing Normal University, Beijing 100875, China. Corresponding author: weikai.zong@bnu.edu.cn

About: Stéphane Charpinet

IRAP, CNRS, Université de Toulouse, CNES, 14 Avenue Edouard Belin, 31400 Toulouse, France. Corresponding author: stephane.charpinet@irap.omp.eu

About: Gérard Vauclair

IRAP, CNRS, Université de Toulouse, CNES, 14 Avenue Edouard Belin, 31400 Toulouse, France

About: Jian-Ning Fu

Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing 102206, China and Department of Astronomy, Beijing Normal University, Beijing 100875, China

About: Xiao-Yu Ma

Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing 102206, China and Department of Astronomy, Beijing Normal University, Beijing 100875, China