The Creation of Haumea's Collisional Family
Hilke E. Schlichting (1), Re'em Sari (1,2) ((1) California, Institute of Technology, (2) Hebrew University)

TL;DR
This paper proposes a new formation scenario for Haumea's collisional family involving a moon's tidal evolution and collision, which better matches observed velocity dispersions and explains the family's origin in the primordial Kuiper belt.
Contribution
It introduces a novel formation model where the family forms from a moon's collision, aligning with observed velocity dispersions and the primordial Kuiper belt conditions.
Findings
Velocity dispersion of 190 m/s matches observations.
Formation scenario allows impact before Kuiper belt excitation.
Probability of initial impact is less than 10^{-3}.
Abstract
Recently, the first collisional family was discovered in the Kuiper belt. The parent body of this family, Haumea, is one of the largest objects in the Kuiper belt and is orbited by two satellites. It has been proposed that the Haumea family was created from dispersed fragments that resulted from a giant impact. This proposed origin of the Haumea family is however in conflict with the observed velocity dispersion between the family members (\sim 140 m/s) which is significantly less than the escape velocity from Haumea's surface (\sim 900 m/s). In this paper we propose a different formation scenario for Haumea's collisional family. In our scenario the family members are ejected while in orbit around Haumea. This scenario, therefore, gives naturally rise to a lower velocity dispersion among the family members than expected from direct ejection from Haumea's surface. In our scenario…
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