The universal red-giant oscillation pattern; an automated determination with CoRoT data

TL;DR

This paper introduces a universal oscillation pattern for red giants, enabling automated, precise identification of eigenmodes from CoRoT data, which advances asteroseismology by solving key mode identification challenges.

Contribution

The study develops a theoretical oscillation pattern based on new scaling laws, allowing for automated and accurate eigenmode parameter determination in red giants.

Findings

The oscillation pattern is universal across red giants.

Eigenmode radial orders and angular degrees can be unambiguously assigned.

The method improves the precision of red-giant interior modeling.

Abstract

The CoRoT and Kepler satellites have provided thousands of red-giant oscillation spectra. The analysis of these spectra requires efficient methods for identifying all eigenmode parameters. The assumption of new scaling laws allows us to construct a theoretical oscillation pattern. We then obtain a highly precise determination of the large separation by correlating the observed patterns with this reference. We demonstrate that this pattern is universal and are able to unambiguously assign the eigenmode radial orders and angular degrees. This solves one of the current outstanding problems of asteroseismology hence allowing precise theoretical investigation of red-giant interiors.