GYRE: An open-source stellar oscillation code based on a new Magnus Multiple Shooting Scheme

Abstract

We present a new oscillation code, GYRE, which solves the stellar pulsation equations (both adiabatic and non-adiabatic) using a novel Magnus Multiple Shooting numerical scheme devised to overcome certain weaknesses of the usual relaxation and shooting schemes appearing in the literature. The code is accurate (up to 6th order in the number of grid points), robust, efficiently makes use of multiple processor cores and/or nodes, and is freely available in source form for use and distribution. We verify the code against analytic solutions and results from other oscillation codes, in all cases finding good agreement. Then, we use the code to explore how the asteroseismic observables of a 1.5 M_sun star change as it evolves through the red-giant bump.

14 pages, 7 figures, accepted by MNRAS

References in corpus (5)

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• Possible evidence of p-modes in Cassini measurements of Saturn's gravity field
• Facing the phase: Gravity-mode offset and buoyancy glitches in red--giant branch stars
• Damping of Oscillations in Red Giants by Resonant Mode Coupling
• Testing the 3-equation Kuhfuss Convection Model using the Sun
• Pulsation and Rotation of the EL CVn-type Eclipsing Binary 1SWASP J024743.37-251549.2
• Asteroseismology of 35 Kepler and TESS $\delta$ Scuti stars near the red edge of the instability strip. The limitations of $\delta$ Scuti stars for dating open clusters
• On the diversity of mixing and helium core masses of B-type dwarfs from gravity-mode asteroseismology
• Observational imprints of tidal internal gravity wave dissipation in star-planet systems