Science Archives Publication System

Global-scale surface spectral variations on Titan seen from Cassini/VIMS

DOI: 10.1016/j.icarus.2006.08.021 Bibcode: 2007Icar..186..242B

Sotin, Christophe; Barnes, Jason W.; Rodriguez, Sebastien +7 more

We present global-scale maps of Titan from the Visual and Infrared Mapping Spectrometer (VIMS) instrument on Cassini. We map at 64 near-infrared wavelengths simultaneously, covering the atmospheric windows at 0.94, 1.08, 1.28, 1.6, 2.0, 2.8, and 5 µm with a typical resolution of 50 km/pixel or a typical total integration time of 1 s. Our map…

2007 • Icarus

Cassini 117

Are ``EIT Waves'' Fast-Mode MHD Waves?

DOI: 10.1086/519013 Bibcode: 2007ApJ...664..556W

DeForest, C. E.; Stenflo, J. O.; Wills-Davey, M. J.

We examine the nature of large-scale, coronal, propagating wave fronts (``EIT waves'') and find they are incongruous with solutions using fast-mode MHD plane-wave theory. Specifically, we consider the following properties: nondispersive single pulse manifestations, observed velocities below the local Alfvén speed, and different pulses which travel…

2007 • The Astrophysical Journal

SOHO 116

The peculiar horizontal branch morphology of the Galactic globular clusters NGC 6388 and NGC 6441: new insights from UV observations

DOI: 10.1051/0004-6361:20077806 Bibcode: 2007A&A...474..105B

Djorgovski, S. G.; Zoccali, M.; Busso, G. +9 more

Context: In this paper we present multiband optical and UV Hubble Space Telescope photometry of the two Galactic globular clusters NGC 6388 and NGC 6441.
Aims: We investigate the properties of their anomalous horizontal branches in different photometric planes in order to shed light on the nature of the ph…

2007 • Astronomy and Astrophysics

eHST 116

A New View of the Coupling of the Sun and the Heliosphere

DOI: 10.1146/annurev.astro.45.010807.154030 Bibcode: 2007ARA&A..45..297Z

Zurbuchen, Thomas H.

The structure of the global heliospheric field reflects the physical properties of the low corona. The implied connections between solar and heliospheric evolution have been analyzed by a powerful multisatellite solar and heliospheric observatory that includes the Ulysses and the Solar and Heliospheric Observatory (SOHO) spacecraft. This coordinat…

2007 • Annual Review of Astronomy and Astrophysics

Ulysses 116

Vertical profiles of HCN, HC ₃N, and C ₂H ₂ in Titan's atmosphere derived from Cassini/CIRS data

DOI: 10.1016/j.icarus.2006.09.024 Bibcode: 2007Icar..186..364T

Fletcher, L.; Irwin, P. G. J.; Teanby, N. A. +9 more

Mid-infrared limb spectra in the range 600-1400 cm^-1 taken with the Composite InfraRed Spectrometer (CIRS) on-board the Cassini spacecraft were used to determine vertical profiles of HCN, HC₃N, C₂H₂, and temperature in Titan's atmosphere. Both high (0.5 cm^-1) and low (13.5 cm^-1) spe…

2007 • Icarus

Cassini 116

Visual Binaries in the Orion Nebula Cluster

DOI: 10.1086/523596 Bibcode: 2007AJ....134.2272R

Bally, John; Reipurth, Bo; Connelley, Michael S. +1 more

We have carried out a major survey for visual binaries toward the Orion Nebula Cluster, using images obtained with the Advanced Camera for Surveys on the Hubble Space Telescope through an Hα filter. From 1051 stars more than 60″ from θ¹ Ori C, we have selected 781 that fulfill the criteria for membership in the Orion Nebula Cluster. Amo…

2007 • The Astronomical Journal

eHST 115

Deep FORS1 Observations of the Double Main Sequence of ω Centauri

DOI: 10.1086/509711 Bibcode: 2007ApJ...654..915S

Pancino, E.; Bellazzini, M.; Origlia, L. +3 more

We present the results of a deep photometric survey performed with the VLT FORS1 aimed at investigating the complex main-sequence structure of the stellar system ω Centauri. We confirm the presence of a double main sequence and identify its blue component (bMS) over a large field of view up to 26' from the cluster center. We found that bMS stars a…

2007 • The Astrophysical Journal

eHST 115

Io Volcanism Seen by New Horizons: A Major Eruption of the Tvashtar Volcano

DOI: 10.1126/science.1147621 Bibcode: 2007Sci...318..240S

Stern, S. A.; Weaver, H. A.; Spencer, J. R. +14 more

Jupiter’s moon Io is known to host active volcanoes. In February and March 2007, the New Horizons spacecraft obtained a global snapshot of Io’s volcanism. A 350-kilometer-high volcanic plume was seen to emanate from the Tvashtar volcano (62°N, 122°W), and its motion was observed. The plume’s morphology and dynamics support nonballistic models of l…

2007 • Science

eHST 114

Saturn’s Small Inner Satellites: Clues to Their Origins

DOI: 10.1126/science.1143977 Bibcode: 2007Sci...318.1602P

Porco, C. C.; Thomas, P. C.; Weiss, J. W. +1 more

Cassini images of Saturn’s small inner satellites (radii of less than ~100 kilometers) have yielded their sizes, shapes, and in some cases, topographies and mean densities. This information and numerical N-body simulations of accretionary growth have provided clues to their internal structures and origins. The innermost ring-region satellites have…

2007 • Science

Cassini 113

Pressurized oceans and the eruption of liquid water on Europa and Enceladus

DOI: 10.1029/2007GL029297 Bibcode: 2007GeoRL..34.7202M

Manga, M.; Wang, C. -Y.

It is difficult for liquid water to erupt onto the surface of icy satellites, such as Europa and Enceladus, because liquid water is more dense than ice. If the ice shell thickens, the volume expansion of ice upon freezing increases pressure in the subsurface ocean. The excess pressure is determined by a balance between compression of ocean water a…

2007 • Geophysical Research Letters

Cassini 113