TY - JOUR
T1 - A taxonomic study of asteroid families from KMTNet-SAAO multiband photometry
AU - Erasmus, N.
AU - McNeill, A.
AU - Mommert, M.
AU - Trilling, D. E.
AU - Sickafoose, A. A.
AU - Paterson, K.
N1 - Funding Information:
This research has made use of the KMTNet system operated by the Korea Astronomy and Space Science Institute (KASI), and the data were obtained by observations made at the South African Astronomical Observatory (SAAO). This work is partially supported by the South African National Research Foundation (NRF). This work is supported in part by the National Aeronautics and Space Administration (NASA) under grant No. NNX15AE90G issued through the SSO Near-Earth Object Observations Program and in part by a grant from NASA?s Office of the Chief Technologist.
Publisher Copyright:
© 2019. The American Astronomical Society. All rights reserved.
PY - 2019
Y1 - 2019
N2 - We present here multiband photometry for over 2000 Main-Belt asteroids. For each target, we report the probabilistic taxonomy using the measured V – R and V – I colors in combination with a machine-learning-generated decision surface in color–color space. Through this method, we classify >85% of our targets as one the four main Bus–DeMeo complexes: S-, C-, X-, or D-type. Roughly one-third of our targets have a known associated dynamic family, with 69 families represented in our data. Within uncertainties, our results show no discernible difference in taxonomic distribution between family members and non-family members. Nine of the sixty-nine families represented in our observed sample had 20 or more members present, and therefore, we investigate the taxonomy of these families in more detail and find excellent agreement with the literature. Out of these nine well-sampled families, our data show that the Themis, Koronis, Hygiea, Massalia, and Eunomia families display a high degree of taxonomic homogeneity and that the Vesta, Flora, Nysa–Polana, and Eos families show a significant level of mixture in taxonomies. Using the taxonomic purity and the degree of dispersion in observed colors for each of the nine well-sampled collisional families, we also speculate which of these families potentially originated from a differentiated parent body and/or is a family with a possible undetermined nested family. In addition, we obtained sufficient photometric data for 433 of our targets to extract reliable rotation periods and observe no obvious correlation between rotation properties and family membership.
AB - We present here multiband photometry for over 2000 Main-Belt asteroids. For each target, we report the probabilistic taxonomy using the measured V – R and V – I colors in combination with a machine-learning-generated decision surface in color–color space. Through this method, we classify >85% of our targets as one the four main Bus–DeMeo complexes: S-, C-, X-, or D-type. Roughly one-third of our targets have a known associated dynamic family, with 69 families represented in our data. Within uncertainties, our results show no discernible difference in taxonomic distribution between family members and non-family members. Nine of the sixty-nine families represented in our observed sample had 20 or more members present, and therefore, we investigate the taxonomy of these families in more detail and find excellent agreement with the literature. Out of these nine well-sampled families, our data show that the Themis, Koronis, Hygiea, Massalia, and Eunomia families display a high degree of taxonomic homogeneity and that the Vesta, Flora, Nysa–Polana, and Eos families show a significant level of mixture in taxonomies. Using the taxonomic purity and the degree of dispersion in observed colors for each of the nine well-sampled collisional families, we also speculate which of these families potentially originated from a differentiated parent body and/or is a family with a possible undetermined nested family. In addition, we obtained sufficient photometric data for 433 of our targets to extract reliable rotation periods and observe no obvious correlation between rotation properties and family membership.
KW - Minor planets, asteroids: individual (Main-Belt asteroids)
KW - Surveys
KW - Techniques: photometric Supporting material: figure set, machine-readable table
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U2 - 10.3847/1538-4365/ab1344
DO - 10.3847/1538-4365/ab1344
M3 - Article
AN - SCOPUS:85069957350
VL - 242
JO - Astrophysical Journal, Supplement Series
JF - Astrophysical Journal, Supplement Series
SN - 0067-0049
IS - 2
M1 - 15
ER -