Asteroid families in the first order resonances with Jupiter
Miroslav Bro\v{z}, David Vokrouhlick\'y

TL;DR
This study revises asteroid populations in Jupiter's first-order resonances, characterizes asteroid families, and uses numerical simulations to understand their evolution, ages, and stability during planetary resonance crossings.
Contribution
It provides new insights into the composition, age, and dynamical behavior of asteroid families in Jupiter's resonances, including the first characterization of a collisionally-born family in J3/2.
Findings
Identified asteroid families in J2/1, J3/2, and J4/3 resonances.
Estimated ages of asteroid families, e.g., 1.7 Gyr for Schubart.
Demonstrated Yarkovsky effect causes eccentricity drift in resonant asteroids.
Abstract
Asteroids residing in the first-order mean motion resonances with Jupiter hold important information about the processes that set the final architecture of giant planets. Here we revise current populations of objects in the J2/1 (Hecuba-gap group), J3/2 (Hilda group) and J4/3 (Thule group) resonances. The number of multi-opposition asteroids found is 274 for J2/1, 1197 for J3/2 and 3 for J4/3. Using both hierarchical clustering technique and colour identification we characterise a collisionally-born asteroid family around the object (1911) Schubart in the J3/2 resonance. There is also a looser cluster around the largest asteroid (153) Hilda. Using N-body numerical simulations we prove that the Yarkovsky effect (infrared thermal emission from the surface of asteroids) causes a systematic drift in eccentricity for resonant asteroids, while their semimajor axis is almost fixed due to the…
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