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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 225849.0, MPI für Astronomie / Publikationen_mpia
A new VLT surface map of Titan at 1.575 microns
Authors:Hartung, M.; Herbst, T. M.; Close, L. M.; Lenzen, R.; Brandner, W.; Marco, O.; Lidman, C.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Astronomy and Astrophysics
Start Page:L17
End Page:L20
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present a first high contrast 1.575 micron
surface map of Titan, that is haze corrected by
simultaneously imaging the stratospheric layer.
At visible and most near-infrared wavelengths,
the methane rich atmosphere completely obscures
the surface; only in a few narrow wavelength
windows does the atmosphere become optically
thin. One of the most convenient windows
\citep{griffith03} lies at 1.58 ‚‚mu;m, adjacent
to the methane absorption feature at 1.62
‚‚mu;m. Our data span seven consecutive nights,
resulting in phase coverage of 275‚‚deg; in
longitude. The images were taken with
NAOS-CONICA adaptive optics system at the VLT,
using the recently commissioned Simultaneous
Differential Imager mode (SDI). The combination
of adaptive optics and simultaneous imaging
through three filters sampling the methane
absorption at 1.6 micron reveals extraordinary
details of Titan's surface. Providing views of
Titan's surface at high resolution (60 mas) is
of particular topical importance, since the
Cassini-Huygens mission is currently approaching
the Saturn system and the Huygens probe will
enter Titan's atmosphere in early 2005.
Free Keywords:planets and satellites: individual: Titan;
; infrared: solar system; instrumentation:
; adaptive optics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Cordova 3107, Santiago 19, Chile),
AB(Max-Planck-Institut f‚‚uuml;r Astronomie,
K‚‚ouml;nigstuhl 17, 69117 Heidelberg, Germany),
AC(Steward Observatory, University of Arizona,
933 N. Cherry Ave., Tucson, AZ 85721-0065, USA),
AD(Max-Planck-Institut f‚‚uuml;r Astronomie,
K‚‚ouml;nigstuhl 17, 69117 Heidelberg, Germany),
AE(Max-Planck-Institut f‚‚uuml;r Astronomie,
K‚‚ouml;nigstuhl 17, 69117 Heidelberg, Germany),
AF(European Southern Observatory, Alonso de
Cordova 3107, Santiago 19, Chile), AG(European
Southern Observatory, Alonso de Cordova 3107,
Santiago 19, Chile)
Identifiers:URL: [ID No:1]
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