Revisiting the Planet Mass and Stellar Metallicity Relation for Low-Mass Exoplanets Orbiting GKM Class Stars

TL;DR

This study investigates the relationship between planet mass and stellar metallicity for low-mass exoplanets orbiting GKM stars, revealing an exponential correlation that extends our understanding of planet formation processes.

Contribution

It provides new evidence of an exponential correlation between planet mass and stellar metallicity for low-mass exoplanets, challenging existing explanations based solely on observational biases.

Findings

Exponential law relationship between planet mass and stellar metallicity.

Correlation not fully explained by observational biases.

Insights into different formation processes for small planets.

Abstract

The growing database of exoplanets have shown us the statistical characteristics of various exoplanet populations, providing insight towards their origins. Observational evidence suggests that the process by which gas giants are conceived in the stellar disk may be disparate from that of smaller planets. Using NASA's Exoplanet Archive, we analyzed a correlation between the planet mass and stellar metallicity of low-mass exoplanets (MP < 0.13 MJ) orbiting spectral class G, K, and M stars. The correlation suggests an exponential law relationship between the two that is not fully explained by observation biases alone.