Asteroseismic cartography of hydrogen-deficient white dwarfs

TL;DR

This paper uses advanced asteroseismic techniques to precisely map the internal structure of a hydrogen-deficient white dwarf, revealing detailed core composition and improving modeling accuracy significantly.

Contribution

It introduces a new core parameterization in asteroseismic modeling that achieves unprecedented precision in fitting observed stellar pulsation periods.

Findings

Accurately reproduces observed pulsation periods of PG 0112+104

Reveals detailed C/O stratification in the star's core

Outperforms previous models by orders of magnitude

Abstract

We present the results of the asteroseismic analysis of the hydrogen-deficient white dwarf PG 0112+104 from the $Kepler$-2 field. Our seismic procedure using the forward method based on physically sound, static models, includes the new core parameterization leading us to reproduce the periods of this star near the precision of the observations. This new fit outperforms current state-of-the-art standards by order of magnitudes. We precisely establish the internal structure and unravel the inner C/O stratification of its core. This opens up interesting perspectives on better constraining key processes in stellar physics such as nuclear burning, convection, and mixing, that shape this stratification over time.