S20B0128abst
S20B0128
Of the compositional medley feasting within a narrow annulus (2.1β4.2 au) surrounding the Sun, D- and T-type asteroids stand out in their reddest, featureless spectra in the visible and near-infrared wavelengths (VNIR). These very-red asteroids are thought to retain abundant primitive materials left from the nascent solar system. There are competing theories as to the origin of these objects (either if they are planetesimals migrated from well beyond Jupiter into the current sub-Jupiter orbits (<5 au) or if they are collisional fragments of parent bodies indigenous in the current orbits) that can be answered by constraining their surface composition. Overcoming the ambiguity in extant compositional studies of the featureless VNIR spectra, here we propose the first systematic L-band spectroscopic study of very-red asteroids using Subaru/IRCS. Detection and identification of the diagnostic absorption features in this wavelength offer key constraints on the source region of an asteroid where a specific type of ice existed and thus will enlighten the evolution of the specific region in the solar system.
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