---
OA_place: publisher
OA_type: diamond
PlanS_conform: '1'
_id: '20454'
abstract:
- lang: eng
  text: "Context. γ Dor stars are ideal targets for studies of the innermost dynamical
    properties of stars, due to their rich asteroseismic spectrum of gravity modes.
    Integrating internal magnetism to the picture appears as the next milestone of
    detailed asteroseismic studies, for its prime importance on stellar evolution.
    The inertial dip in prograde dipole modes period-spacing pattern of γ Dors stands
    out as a unique window on the convective core structure and dynamics. Recent studies
    have highlighted the dependence of the dip structure on core density stratification,
    the contrast of the near-core Brunt-Väisälä frequency and rotation rate, as well
    as the core-to-near-core differential rotation. In addition, the effect of envelope
    magnetism has been derived on low-frequency magneto-gravito-inertial waves.\r\n\r\nAims.
    We revisited the inertial dip formation including core and envelope magnetism,
    and explored the probing power of this feature on dynamo-generated core fields.\r\n\r\nMethods.
    We considered as a first step a toroidal magnetic field with a bi-layer (core
    and envelope) Alfvén frequency. This configuration allowed us to revisit the coupling
    problem using our knowledge on both core magneto-inertial modes and envelope magneto-gravito-inertial
    modes. Using this configuration, we were able to stay in an analytical framework
    to exhibit the magnetic effects on the inertial dip shape and location. This configuration
    allowed a laboratory to be set up that moves us towards the comprehension of magnetic
    effects on the dip structure.\r\n\r\nResults. We show a shift of the inertial
    dip towards lower spin parameter values and a thinner dip with increasing core
    magnetic field’s strength, quite similar to the signature of differential rotation.
    The magnetic effects become sizeable when the ratio of the magnetic to the Coriolis
    effects is high enough. We explored the potential degeneracy of the magnetic effects
    with differential rotation. We studied the detectability of core magnetism, considering
    both observational constraints on the periods of the modes and potential gravito-inertial
    mode suppression."
acknowledgement: 'We thank the referee for their comments and suggestions which allowed
  us to improve the quality of this manuscript. L. Barrault and L. Bugnet gratefully
  acknowledge support from the European Research Council (ERC) under the Horizon Europe
  programme (Calcifer; Starting Grant agreement N°101165631). S. Mathis acknowledges
  support from the PLATO CNES grant at CEA/DAp. S. Mathis and J.S.G. Mombarg acknowledge
  support from the European Research Council through HORIZON ERC SyG Grant 4D-STAR
  101071505. While partially funded by the European Union, views and opinions expressed
  are however those of the authors only and do not necessarily reflect those of the
  European Union or the European Research Council. Neither the European Union nor
  the granting authority can be held responsible for them. L. Barrault thanks T. Van
  Reeth and C. Aerts for their invaluable teachings. The authors thank also the members
  of the Asteroseismology and Stellar Dynamics group of the Institute of Science and
  Technology Austria (ISTA) for very useful discussion: A. Cristea, L. Einramhof,
  K. M. Smith, S. Torres.'
article_number: A253
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Lucas
  full_name: Barrault, Lucas
  id: 4471a8fd-32c1-11ee-a9a4-fb670d398f64
  last_name: Barrault
- first_name: Lisa Annabelle
  full_name: Bugnet, Lisa Annabelle
  id: d9edb345-f866-11ec-9b37-d119b5234501
  last_name: Bugnet
  orcid: 0000-0003-0142-4000
- first_name: S.
  full_name: Mathis, S.
  last_name: Mathis
- first_name: J. S.G.
  full_name: Mombarg, J. S.G.
  last_name: Mombarg
citation:
  ama: 'Barrault L, Bugnet LA, Mathis S, Mombarg JSG. Exploring the probing power
    of γ Dor’s inertial dip for core magnetism: The case of a toroidal field. <i>Astronomy
    &#38; Astrophysics</i>. 2025;701. doi:<a href="https://doi.org/10.1051/0004-6361/202555213">10.1051/0004-6361/202555213</a>'
  apa: 'Barrault, L., Bugnet, L. A., Mathis, S., &#38; Mombarg, J. S. G. (2025). Exploring
    the probing power of γ Dor’s inertial dip for core magnetism: The case of a toroidal
    field. <i>Astronomy &#38; Astrophysics</i>. EDP Sciences. <a href="https://doi.org/10.1051/0004-6361/202555213">https://doi.org/10.1051/0004-6361/202555213</a>'
  chicago: 'Barrault, Lucas, Lisa Annabelle Bugnet, S. Mathis, and J. S.G. Mombarg.
    “Exploring the Probing Power of γ Dor’s Inertial Dip for Core Magnetism: The Case
    of a Toroidal Field.” <i>Astronomy &#38; Astrophysics</i>. EDP Sciences, 2025.
    <a href="https://doi.org/10.1051/0004-6361/202555213">https://doi.org/10.1051/0004-6361/202555213</a>.'
  ieee: 'L. Barrault, L. A. Bugnet, S. Mathis, and J. S. G. Mombarg, “Exploring the
    probing power of γ Dor’s inertial dip for core magnetism: The case of a toroidal
    field,” <i>Astronomy &#38; Astrophysics</i>, vol. 701. EDP Sciences, 2025.'
  ista: 'Barrault L, Bugnet LA, Mathis S, Mombarg JSG. 2025. Exploring the probing
    power of γ Dor’s inertial dip for core magnetism: The case of a toroidal field.
    Astronomy &#38; Astrophysics. 701, A253.'
  mla: 'Barrault, Lucas, et al. “Exploring the Probing Power of γ Dor’s Inertial Dip
    for Core Magnetism: The Case of a Toroidal Field.” <i>Astronomy &#38; Astrophysics</i>,
    vol. 701, A253, EDP Sciences, 2025, doi:<a href="https://doi.org/10.1051/0004-6361/202555213">10.1051/0004-6361/202555213</a>.'
  short: L. Barrault, L.A. Bugnet, S. Mathis, J.S.G. Mombarg, Astronomy &#38; Astrophysics
    701 (2025).
corr_author: '1'
date_created: 2025-10-12T22:01:26Z
date_published: 2025-09-01T00:00:00Z
date_updated: 2026-02-19T09:32:04Z
day: '01'
ddc:
- '520'
department:
- _id: LiBu
- _id: GradSch
doi: 10.1051/0004-6361/202555213
external_id:
  arxiv:
  - '2507.00308'
  isi:
  - '001585834500002'
file:
- access_level: open_access
  checksum: 2c209b33119af4a251bab4a418a21075
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  creator: dernst
  date_created: 2025-10-13T07:05:55Z
  date_updated: 2025-10-13T07:05:55Z
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  file_name: 2025_AstronomyAstrophysics_BarraultL.pdf
  file_size: 2503149
  relation: main_file
  success: 1
file_date_updated: 2025-10-13T07:05:55Z
has_accepted_license: '1'
intvolume: '       701'
isi: 1
language:
- iso: eng
license: https://creativecommons.org/licenses/by/4.0/
month: '09'
oa: 1
oa_version: Published Version
project:
- _id: 914d8549-16d5-11f0-9cad-bbe6324c93a9
  grant_number: '101165631'
  name: 'Unveiling the mysteries of stellar dynamics: a pioneering journey in magnetoasteroseismology'
publication: Astronomy & Astrophysics
publication_identifier:
  eissn:
  - 1432-0746
  issn:
  - 0004-6361
publication_status: published
publisher: EDP Sciences
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Exploring the probing power of γ Dor''s inertial dip for core magnetism: The
  case of a toroidal field'
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 701
year: '2025'
...