Binary Asteroseismic Modelling: isochrone-cloud methodology and application to Kepler gravity-mode pulsators

TL;DR

This paper introduces a combined binary and asteroseismic modelling method to accurately determine stellar properties, demonstrated on Kepler gravity-mode pulsators, and provides a new isochrone-cloud framework for the community.

Contribution

It presents an efficient grid-based methodology integrating binary and asteroseismic data, including a novel isochrone-cloud approach for stellar parameter estimation.

Findings

Parameters for three Kepler binaries were estimated.

The methodology addresses parameter degeneracies effectively.

Asteroseismically calibrated isochrone-clouds are provided for community use.

Abstract

The simultaneous presence of variability due to both pulsations and binarity is no rare phenomenon. Unfortunately, the complexities of dealing with even one of these sources of variability individually means that the other signal is often treated as a nuisance and discarded. However, both types of variability offer means to probe fundamental stellar properties in robust ways through asteroseismic and binary modelling. We present an efficient methodology that includes both binary and asteroseismic information to estimate fundamental stellar properties based on a grid-based modelling approach. We report parameters for three gravity mode pulsating {\it Kepler} binaries , such as mass, radius, age, as well the mass of the convective core and location of the overshoot region. We discuss the presence of parameter degeneracies and the way our methodology deals with them. We provide asteroseismically calibrated isochrone-clouds to the community; these are a generalisation of isochrones when allowing for different values of the core overshooting in the two components of the binary.