The formation of Haumea and its family via binary merging

TL;DR

This paper proposes that the Haumea asteroid family was formed through the merging of a binary object during Neptune's orbital migration, providing a comprehensive explanation for its unique characteristics.

Contribution

It introduces a novel binary merging model during planetary migration to explain the formation of the Haumea family, resolving previous inconsistencies.

Findings

Binary merging explains Haumea's orbital and physical features

Unique binary signatures are erased during Neptune's migration

Model offers a new formation scenario consistent with observations

Abstract

Dozens of families of asteroids in the asteroid belt have similar orbits and compositions because they formed through a collision. However, the icy debris beyond the orbit of Neptune, called the Kuiper Belt, contains only one known family, the Haumea family. So far, no self-consistent explanation for the formation of the Haumea family can match all geophysical and orbital characteristics of the family without invoking extremely improbable events. Here, we show that the family is adequately explained as the product of a merging binary near the end of Neptune's orbital migration. The unique orbital signature of a merging binary, which was not found in extensive searches, is effectively erased during the final stages of migration, providing an explanation for all aspects of the Haumea family. By placing the formation of the Haumea family in the broader context of solar system formation, we demonstrate a proof-of-concept model for the formation of Haumea.