"In-System" Fission-Events: An Insight into Puzzles of Exoplanets and Stars?

TL;DR

This paper proposes that in-system fission events, caused by stellar-object encounters, could explain peculiar features in stars and exoplanetary systems, suggesting a universal mechanism influencing planetary system evolution.

Contribution

It introduces a novel framework linking stellar encounters and fission events to observed anomalies in stars and exoplanets, expanding understanding of planetary system formation.

Findings

Potential explanation for chemical peculiarities in stars

Correlation between high planet densities and fission events

Classification scheme for stellar systems based on impact history

Abstract

In expansion of our recent proposal (Physics, 2020, 2, 213-276) that the solar system's evolution occurred in two stages -- during the first stage, the gaseous giants formed (via disk instability), and, during the second stage (caused by an encounter with a particular stellar-object leading to "in-system" fission-driven nucleogenesis), the terrestrial planets formed (via accretion) -- we emphasize here that the mechanism of formation of such stellar-objects is generally universal and therefore encounters of such objects with stellar-systems may have occurred elsewhere across galaxies. If so, their aftereffects may perhaps be observed as puzzling features in the spectra of individual stars (such as idiosyncratic chemical enrichments) and/or in the structures of exoplanetary systems (such as unusually high planet densities or short orbital periods). This paper reviews and reinterprets astronomical data within the "fission-events framework." Classification of stellar systems as "pristine" or "impacted" is offered.