Propagating Linear Waves in Convectively Unstable Stellar Models: A Perturbative Approach

E. Papini, Laurent Gizon, A. C. Birch

Research output: Contribution to journalArticle

Abstract

Linear time-domain simulations of acoustic oscillations are unstable in the stellar convection zone. To overcome this problem it is customary to compute the oscillations of a stabilized background stellar model. The stabilization affects the result, however. Here we propose to use a perturbative approach (running the simulation twice) to approximately recover the acoustic wave field while preserving seismic reciprocity. To test the method we considered a 1D standard solar model. We found that the mode frequencies of the (unstable) standard solar model are well approximated by the perturbative approach within 1 μHz for low-degree modes with frequencies near 3 mHz. We also show that the perturbative approach is appropriate for correcting rotational-frequency kernels. Finally, we comment that the method can be generalized to wave propagation in 3D magnetized stellar interiors because the magnetic fields have stabilizing effects on convection.

Original languageEnglish (US)
Pages (from-to)1919-1929
Number of pages11
JournalSolar Physics
Volume289
Issue number6
DOIs
StatePublished - Jun 1 2014

Fingerprint

stellar models
stellar convection
convection
oscillation
stellar interiors
oscillations
reciprocity
acoustics
acoustic wave
wave field
preserving
wave propagation
simulation
stabilization
magnetic field
magnetic fields
method

Keywords

  • Helioseismology
  • Magnetic fields
  • Numerical methods
  • Stellar models

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Propagating Linear Waves in Convectively Unstable Stellar Models : A Perturbative Approach. / Papini, E.; Gizon, Laurent; Birch, A. C.

In: Solar Physics, Vol. 289, No. 6, 01.06.2014, p. 1919-1929.

Research output: Contribution to journalArticle

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