S19B0078abst
S19B0078
Jupiter and Neptune have so-called Trojan asteroids that share the same orbit with the planet but are distributed around the L4 and L5 Lagrangian points 60 degrees ahead and behind the planet. Since these Trojans were likely captured from the trans-Neptunian disk as a result of migration of giant planets, they would provide unique constraints on radial mixing of small icy bodies during planetary migration. Jupiter Trojans are known to have a size distribution similar to dynamically excited trans-Neptunian objects (TNOs), which supports the above model for the origin of the Trojans. However, the color distribution of Jupiter Trojans is distinct from that of TNOs. For a comprehensive understanding of the origin of the Trojan asteroids, Neptune Trojans (NTs) are expected to play a key role. Despite their importance, however, only 22 NTs have been discovered so far due to their faintness, and their distributions of size and color have been poorly constrained. Here we propose to detect NTs with HSC and measure their size and color. Using these results, we will derive new constrains on the origin of NTs, migration of giant planets, radial mixing of small bodies in the outer Solar System, and planetesimal formation.
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