FILOU oscillation code

TL;DR

The FILOU code computes adiabatic oscillation frequencies of stars, including rotational effects up to second order, aiding interpretation of space-based asteroseismic data, especially for rotating stellar models.

Contribution

It introduces a perturbative method for calculating oscillation frequencies in rotating stars, accommodating both uniform and differential rotation profiles, which is novel in the field.

Findings

Calculates oscillation frequencies with rotational corrections up to second order.

Handles both uniform and shellular differential rotation profiles.

Supports applications in asteroseismology, especially for CoRoT data analysis.

Abstract

The present paper provides a description of the oscillation code FILOU, its main features, type of applications it can be used for, and some representative solutions. The code is actively involved in CoRoT/ESTA exercises (this volume) for the preparation for the proper interpretation of space data from the CoRoT mission. Although CoRoT/ESTA exercises have been limited to the oscillations computations for non-rotating models, the main characteristic of FILOU is, however, the computation of radial and non-radial oscillation frequencies in presence of rotation. In particular, FILOU calculates (in a perturbative approach) adiabatic oscillation frequencies corrected for the effects of rotation (up to the second order in the rotation rate) including near degeneracy effects. Furthermore, FILOU works with either a uniform rotation or a radial differential rotation profile (shellular rotation), feature which makes the code singular in the field.