Bibcode
Arredondo, Anicia; Pinilla-Alonso, Noemi; Campins, Humberto; Malfavon, Andrew; Lorenzi, Vania; de Leon, Julia; Morate, David
Referencia bibliográfica
American Astronomical Society, DPS meeting #50, id.310.06
Advertised on:
10
2018
Número de citas
0
Número de citas referidas
0
Descripción
The PRIMitive Asteroid Spectroscopic Survey (PRIMASS) is a visible and
near-infrared study of primitive asteroids throughout the asteroid belt.
Nesvorny et al. 2015 defined 6 primitive families in the inner asteroid
belt: Polana-Eulalia, Erigone, Sulamitis, Clarissa, Chaldaea, and Klio.
PRIMASS has already characterized Polana in visible and NIR, and
Erigone, Sulamitis, and Clarissa in the visible (de Leon et al. 2016;
Pinilla-Alsonso et al. 2016; Morate et al. 2016, 2018). Our published
results show that inner-belt primitive asteroids fall into at least two
distinct compositional groups: Polana-like (spectrally homogenous and no
0.7-micron absorption) or Erigone-like (hydrated and spectrally
diverse). Objects in the Sulamitis family are Erigone-like in the
visible (Morate et al. 2018). No work has been published on the Klio
family in the visible, but there are multiple published spectra of the
parent body (84) Klio. In this work, we present near-infrared spectra of
15 objects in the Kilo family and 5 objects in the Sulamitis family,
obtained with NASA's InfraRed Telescope Facility (IRTF) and the
Telescopio Nazionale Galileo (TNG) between August 2017 and June 2018.
Our initial results show clear differences between the Klio and
Sulamitis families in the NIR, evident even in a small sample size.
Within the uncertainties, Kilo objects are identical to each other and
show essentially flat spectra with no slope and no features. In
contrast, Sulamitis objects are more spectrally diverse which agrees
with what is seen in the visible. Asteroid (84) Kilo shows a clear
0.7-micron feature, associated with hydrated material (Fornasier et al.
2014), which suggests that there is a third compositional group of inner
belt families that are Klio-like (hydrated and spectrally homogeneous).
These three spectral groups occur at three different inclinations:
Polana-like are at low inclination (i<3°), Erigone-like are at
mid inclination (3°8°); i.e., there are similar compositions among
three groups with distinct inclinations.