2021/02/18 by Csilla Kalup, Csilla E. Kalup, L. Molnár +14 · 23 citations
Physics and Astronomy · #Amplitude #Asteroid #Astro and Planetary Science #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Jovian #Photometry (optics) #Physics #Planet #Population #Rotation period #Saturn #Solar System #Stars #Stellar, planetary, and galactic studies #Trojan #astro-ph.EP
paper · pdf · doi:10.3847/1538-4365/abe76a
published in The Astrophysical Journal Supplement Series 254(1), 7 (Institute of Physics) · 25 pages, 19 figures, accepted for publication in ApJS
arxiv created 2021/02/18 · openalex publication_date 2021/04/23 · arxiv updated 2021/05/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract Various properties of Jovian Trojan asteroids such as composition, rotation periods, and photometric amplitudes, or the rate of binarity in the population, can provide information and constraints on the evolution of the group and of the solar system itself. Here we present new photometric properties of 45 Jovian Trojans from the K2 mission of the Kepler space telescope, and present phase-folded light curves for 44 targets, including (11351) Leucus, one of the targets of the Lucy mission. We extend our sample to 101 asteroids with previous K2 Trojan measurements, then compare their combined amplitude and frequency distributions to other ground-based and space data. We show that there is a dichotomy in the periods of Trojans with a separation at ∼100 hr. We find that 25% of the sample are slow rotators ( P ≥ 30 hr), an excess that can be attributed to binary objects. We also show that 32 systems can be classified as potential detached binary systems. Finally, we calculate density and rotation constraints for the asteroids. Both the spin barrier and fits to strengthless ellipsoid models indicate low densities and thus compositions similar to populations of comets and trans-Neptunian objects throughout the sample. This supports the scenario of outer solar system origin for Jovian Trojans.