A New Investigation Of Hydration In The M-Type Asteroids

Keywords

Asteroids, composition; Asteroids, surfaces; Infrared observations; Spectroscopy

Abstract

We obtained 2-4. μm spectra of six M-type asteroids using the SpeX spectrograph at NASA's Infrared Telescope Facility. We find evidence for hydrated minerals on all six asteroids, including two that were previously thought to be dry. One of our targets, (216) Kleopatra, shows rotational variability in the depth of its 3-μm feature. We also studied three of these asteroids in the 0.8-2.4. μm range using the NICS instrument at the Telescopio Nazionale Galileo (TNG) in La Palma, Spain. The discovery of spectral signatures of hydrated minerals on so many M-types is difficult to reconcile with a highly thermally evolved composition. It has been suggested that the hydrated minerals could have been delivered to M-types via impacts with primitive objects, or that the M-types may actually have primitive compositions that are not represented in meteorite collections. Understanding the origin and type of hydration on these asteroids will help determine which of these interpretations is correct.

Publication Date

5-5-2015

Publication Title

Icarus

Volume

252

Number of Pages

186-198

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.icarus.2015.01.021

Socpus ID

84922977547 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84922977547

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