Why do we find ourselves around a yellow star instead of a red star?

TL;DR

This paper uses Bayesian inference to analyze why humans are found orbiting G-dwarf stars instead of more common M-dwarfs, concluding that our current position is statistically typical despite the abundance of other stellar types.

Contribution

It introduces a Bayesian framework to evaluate the likelihood of observers existing around different star types, considering both current and future habitable planets.

Findings

Humans are likely to be found around G-dwarfs due to statistical reasons.

M-dwarfs may host more habitable planets, but observers like us are more probable around G-dwarfs now.

Our current observation is consistent with typicality, not anomaly.

Abstract

M-dwarf stars are more abundant than G-dwarf stars, so our position as observers on a planet orbiting a G-dwarf raises questions about the suitability of other stellar types for supporting life. If we consider ourselves as typical, in the anthropic sense that our environment is probably a typical one for conscious observers, then we are led to the conclusion that planets orbiting in the habitable zone of G-dwarf stars should be the best place for conscious life to develop. But such a conclusion neglects the possibility that K-dwarfs or M-dwarfs could provide more numerous sites for life to develop, both now and in the future. In this paper we analyze this problem through Bayesian inference to demonstrate that our occurrence around a G-dwarf might be a slight statistical anomaly, but only the sort of chance event that we expect to occur regularly. Even if M-dwarfs provide more numerous habitable planets today and in the future, we still expect mid G- to early K-dwarfs stars to be the most likely place for observers like ourselves. This suggests that observers with similar cognitive capabilities as us are most likely to be found at the present time and place, rather than in the future or around much smaller stars.