---
res:
  bibo_abstract:
  - Dipolar (ℓ = 1) mixed modes have revealed a surprisingly weak differential rotation
    between the core and the envelope of evolved solar-like stars. Quadrupolar (ℓ = 2)
    mixed modes also contain information regarding internal dynamics but are very
    rarely characterised due to their low amplitude and the challenging identification
    of adjacent or overlapping rotationally split multiplets affected by near-degeneracy
    effects. We aim to extend the broadly used asymptotic seismic diagnostics beyond
    ℓ = 1 mixed modes by developing an analogue asymptotic description of ℓ = 2 mixed
    modes while explicitly accounting for near-degeneracy effects that distort their
    rotational multiplets. We have derived a new asymptotic formulation of near-degenerate
    mixed ℓ = 2 modes that describes off-diagonal terms representing the interaction
    between modes of adjacent radial orders. This formalism, expressed directly in
    the mixed-mode basis, provides analytical expressions for the near-degeneracy
    effects. We implemented the formalism within a global Bayesian mode-fitting framework
    for a direct fit of all ℓ = 0, 1, 2 modes in the power spectrum density. We were
    able to asymptotically model the asymmetric rotational splitting present in various
    radial orders of ℓ = 2 modes observed in young red giant stars without the need
    for any numerical stellar modelling. We applied our formalism to the Kepler target
    KIC 7341231, and it yielded core and envelope rotation rates consistent with previous
    numerical modelling while providing improved constraints from the global and model-independent
    approach. We also characterised the new target, KIC 8179973, measuring its rotation
    rate and mixed-mode parameters for the first time. As our framework relies on
    a direct global fit, it allows for much better precision on the asteroseismic
    parameters and rotation rate estimates than standard methods, yielding better
    constraints for rotation inversions. We have placed the first observational constraints
    on the asymptotic ℓ = 2 mixed-mode parameters (ΔΠ2, q2, and εg, 2), thus paving
    the way towards the use of asymptotic seismology beyond ℓ = 1 mixed modes.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Bastien Raymond Bernard
      foaf_name: Liagre, Bastien Raymond Bernard
      foaf_surname: Liagre
      foaf_workInfoHomepage: http://www.librecat.org/personId=662f1873-cab4-11f0-a719-8087d302868d
  - foaf_Person:
      foaf_givenName: Aayush A
      foaf_name: Desai, Aayush A
      foaf_surname: Desai
      foaf_workInfoHomepage: http://www.librecat.org/personId=502cfd30-32c1-11ee-a9a4-d8dad5c6739e
  - foaf_Person:
      foaf_givenName: Lukas
      foaf_name: Einramhof, Lukas
      foaf_surname: Einramhof
      foaf_workInfoHomepage: http://www.librecat.org/personId=f1497a1a-72ef-11ef-b75a-fd877bbf6e8c
  - foaf_Person:
      foaf_givenName: Lisa Annabelle
      foaf_name: Bugnet, Lisa Annabelle
      foaf_surname: Bugnet
      foaf_workInfoHomepage: http://www.librecat.org/personId=d9edb345-f866-11ec-9b37-d119b5234501
    orcid: 0000-0003-0142-4000
  bibo_doi: 10.1051/0004-6361/202558023
  bibo_volume: 707
  dct_date: 2026^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/0004-6361
  - http://id.crossref.org/issn/1432-0746
  dct_language: eng
  dct_publisher: EDP Sciences@
  dct_title: 'Near-degeneracy effects in quadrupolar mixed modes: From an asymptotic
    description to data fitting@'
...