Rotation periods of 53 small (diameters 2<D<40 km) Jupiter Trojans (JTs) were derived using the high-cadence light curves obtained by the FOSSIL phase I survey, a Subaru/Hyper Suprime-Cam intensive program. These are the first reported periods measured for JTs with D<10 km. We found a lower limit of the rotation period near 4 hr, instead of the previously published result of 5 hr (Ryan et al. 2017; Szabo et al. 2017, 2020) found for larger JTs. Assuming a rubble-pile structure for JTs, a bulk density of 0.9 gcm−3 is required to withstand this spin rate limit, consistent with the value 0.8−1.0 gcm−3 (Marchis et al. 2006; Mueller et al. 2010; Buie et al. 2015; Berthier et al. 2020) derived from the binary JT system, (617) Patroclus-Menoetius system.
@article{arxiv.2107.06685,
title = {FOSSIL: I. The Spin Rate Limit of Jupiter Trojans},
author = {Chan-Kao Chang and Ying-Tung Chen and Wesley C. Fraser and Fumi Yoshida and Matthew J. Lehner and Shiang-Yu Wang and JJ Kavelaars and Rosemary E. Pike and Mike Alexandersen and Takashi Ito and Young-Jun Choi and A. Paula Granados Contreras and Youngmin JeongAhn and Jianghui Ji and Myung-Jin Kim and Samantha M. Lawler and Jian Li and Zhong-Yi Lin and Patryk Sofia Lykawka and Hong-Kyu Moon and Surhud More and Marco Munoz-Gutierrez and Keiji Ohtsuki and Tsuyoshi Terai and Seitaro Urakawa and Hui Zhang and Hai-Bin Zhao and Ji-Lin Zhou. The FOSSIL Collaboration},
journal= {arXiv preprint arXiv:2107.06685},
year = {2021}
}
Comments
Accepted by PSJ on July 9th, 2021. 15 pages, 7 figures, and 3 tables