Bibcode
Morate, D.; Licandro, J.; Popescu, M.; de León, J.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 617, id.A72, 24 pp.
Fecha de publicación:
9
2018
Revista
Número de citas
8
Número de citas referidas
8
Descripción
The aim of this work is to study the compositional diversity of asteroid
families based on their near-infrared colors, using the data within the
MOVIS catalog. As of 2017, this catalog presents data for 53 436
asteroids observed in at least two near-infrared filters (Y, J, H, or
Ks). Among these asteroids, we find information for 6299 belonging to
collisional families with both Y -J and J-Ks colors defined. The work
presented here complements the data from SDSS and NEOWISE, and allows a
detailed description of the overall composition of asteroid families. We
derived a near-infrared parameter, the ML*, that allows us to
distinguish between four generic compositions: two different primitive
groups (P1 and P2), a rocky population, and basaltic asteroids. We
conducted statistical tests comparing the families in the MOVIS catalog
with the theoretical distributions derived from our ML* in
order to classify them according to the above-mentioned groups. We also
studied the background populations in order to check how similar they
are to their associated families. Finally, we used this parameter in
combination with NEOWISE and SDSS to check for possible bimodalities in
the data. We found 43 families with ML*err <
0.071 and with at least 8 asteroids observed: 5 classified as P1, 10
classified as P2, 19 families associated with the rocky population, and
9 families that were not linked to any of the previous populations. In
these cases, we compared our samples with different combinations of
these theoretical distributions to find the one that best fits the
family data. We also show, using the data from MOVIS and NEOWISE, that
the Bapistina family presents a two-cluster distribution in the
near-infrared albedo vs. ML* parameter space that might be
related to a common differentiated parent body. Finally, we show that
the backgrounds we defined seem to be linked to their associated
families.
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