Dynamics and Habitability in Binary Star Systems

TL;DR

This paper emphasizes the importance of including dynamical orbital interactions in models to accurately assess planetary habitability in binary star systems, where orbital changes significantly impact habitability zones.

Contribution

It introduces the need for a dynamical model to define Habitable Zones in binary systems, extending beyond standard static models.

Findings

Orbital dynamics significantly influence habitability in binary systems.

Standard models may underestimate or overestimate habitable zones without considering orbital evolution.

Dynamical interactions can cause large shifts in habitability boundaries.

Abstract

Determining planetary habitability is a complex matter, as the interplay between a planet's physical and atmospheric properties with stellar insolation has to be studied in a self consistent manner. Standardized atmospheric models for Earth-like planets exist and are commonly accepted as a reference for estimates of Habitable Zones. In order to define Habitable Zone boundaries, circular orbital configurations around main sequence stars are generally assumed. In gravitationally interacting multibody systems, such as double stars, however, planetary orbits are forcibly becoming non circular with time. Especially in binary star systems even relatively small changes in a planet's orbit can have a large impact on habitability. Hence, we argue that a minimum model for calculating Habitable Zones in binary star systems has to include dynamical interactions.