GYRE: An open-source stellar oscillation code based on a new Magnus Multiple Shooting Scheme
R. H. D. Townsend, S. A. Teitler
University of Wisconsin-Madison, Department of Astronomy, Madison, WI 53706, USA
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 Msun star change as it evolves through the red-giant bump.
Reference: MNRAS, in press
Status: Manuscript has been accepted
Comments: Website includes preprint, source code, & documentation