An ALMA search for high albedo objects among the mid-sized Jupiter Trojan population

Autor:	Simpson, Anna M., Brown, Michael E., Schemel, Madeline J., Butler, Bryan J.
Rok vydání:	2022
Předmět:	Astrophysics - Earth and Planetary Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.3847/1538-3881/ac559e
Popis:	We use ALMA measurements of 870 $\mu$m thermal emission from a sample of mid-sized (15-40 km diameter) Jupiter Trojan asteroids to search for high albedo objects in this population. We calculate the diameters and albedos of each object using a thermal model which also incorporates {contemporaneous} Zwicky Transient Facility photometry to accurately measure the absolute magnitude at the time of the ALMA observation. We find that while many albedos are lower than reported from WISE, several small Trojans have high albedos independently measured both from ALMA and from WISE. The number of these high albedo objects is approximately consistent with expectations of the number of objects that recently have undergone large-scale impacts, suggesting that the interiors of freshly-crated Jupiter Trojans could contain high albedo materials such as ices. Comment: AJ, in press
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2202.07066 Zobrazit plný text záznamu View this record from Arxiv