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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 226053.0, MPI für Astronomie / Publikationen_mpia
Aqueous altered silicates at the surface of two Plutinos?
Authors:de Bergh, C.; Boehnhardt, H.; Barucci, M. A.; Lazzarin, M.; Fornasier, S.; Romon-Martin, J.; Tozzi, G. P.; Doressoundiram, A.; Dotto, E.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Astronomy and Astrophysics
Volume:416
Start Page:791
End Page:798
Review Status:not specified
Audience:Not Specified
Abstract / Description:In April 2001 we obtained visible and
near-infrared spectra, as well as photometric
data, for two Trans-Neptunian Objects (TNOs),
2000 GN171 (now numbered 47932) and
2000 EB173 (now designated 38628
Huya), which belong to the dynamical class of
Plutinos. These observations were made with the
FORS1 and ISAAC instruments at the European
Southern Observatory-Very Large Telescope
(ESO-VLT). The detection of weak absorption
features in the visible spectra of these two
Trans-Neptunians has been reported elsewhere
(Lazzarin et al. \cite{Lazzarin03}). In this
paper, we discuss the interpretation of the
features, which are different for the two
objects, and we present some complementary
observations in the near-infrared, as well as
more recent (May 2002) visible spectra in which
the features are absent. Although the visible
colors of the two objects are comparable, the
near-infrared spectra are different: (47932)
2000 GN171 shows a nearly flat
spectrum, except in the H band where a broad
absorption appears, whereas the spectrum of
(38628) Huya (2000 EB173) has a red
slope in the J band and some absorption beyond 2
micron. The features detected in the visible
spectra of the two objects are tentatively
attributed to the presence of iron oxides or
phyllosilicates at the surfaces of the two
objects. The differences between the April 2001
and May 2002 visible spectra are attributed to
spatial variations at the surfaces of the
objects. We briefly discuss possibilities for
aqueous alteration in TNOs, after reviewing what
we know about the presence of aqueously altered
minerals in other small bodies of the solar
system. Further studies monitoring the rotation
of these two objects are highly desirable.
Free Keywords:minor planets; asteroids
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Cedex, France), AB(Max-Planck Institute for
Astronomy, 69117 Heidelberg, Germany), AC(LESIA,
Observatoire de Paris, 92195 Meudon Cedex,
France), AD(Astronomical Department of Padova,
35122 Padova, Italy), AE(Astronomical Department
of Padova, 35122 Padova, Italy), AF(LESIA,
Observatoire de Paris, 92195 Meudon Cedex,
France), AG(INAF-Osservatorio Astrofisico di
Arcetri, 50125 Firenze, Italy), AH(LESIA,
Observatoire de Paris, 92195 Meudon Cedex,
France), AI(INAF-Osservatorio Astronomico di
Roma, 00040 Monteporzio Catone, Italy)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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