NOAO >   Observing Info >   Approved Programs >   2018A-0392

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Program Information for 2018A-0392


PI: Cristina Thomas, Northern Arizona U., cristina.thomas@nau.edu
Address: Physics Department, PO Box 6010, Flagstaff, AZ 86011 USA

CoI: Joshua P Emery, U. of Tennessee
CoI: Andrew Rivkin, Johns Hopkins U.
CoI: Lauren McGraw, U. of Tennessee

Title: Visible Spectroscopy of Nominally Anhydrous Near-Earth and Main Belt Asteroids

Abstract: Recent studies have shown that several airless bodies previously thought to be devoid of OH/H$_2$O, such as the Moon and Vesta, show indications of these materials on their surfaces. There are three proposed hypotheses for the presence of a 3-$mu$m feature on airless bodies: Solar wind implantation, the native presence of silicates, and the delivery of carbonaceous material. Previous observations of nominally anhydrous NEOs and MBAs have shown that spectra of these objects can contain the 3-$mu$m feature normally associated with hydration. The effectiveness of these processes and retention of the products on the surface is dependent on several parameters. Observations of the Moon and laboratory experiments indicate that formation of OH/H$_2$O by solar wind is at least partly controlled by surface composition. We propose to obtain visible wavelength spectra of our target near-Earth and Main Belt asteroids using the SOAR Goodman spectrograph. We will use these spectra with near-infrared data obtained at the NASA IRTF to determine the composition of our targets and assess the dependence of OH/H$_2$O formation processes on composition.

Program Type: Standard/Solar System

Scheduled Nights:
Run 1 (2018A):  SOAR/Goodman -- 0.5n on Mar 07 2018
Run 2 (2018A):  SOAR/Goodman -- 1n on Jun 20 2018


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NOAO >   Observing Info >   Approved Programs >   2018A-0392

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