Search Publications
Magnetic field structure of Saturn's dayside magnetosphere and its mapping to the ionosphere: Results from ring current modeling
Dougherty, M. K.; Cowley, S. W. H.; Bunce, E. J. +1 more
Ring current modeling in Saturn's magnetosphere using Pioneer-11, Voyager, and Cassini data has shown that the size and strength of the current system grows with the extension of the magnetosphere, governed by the solar wind dynamic pressure. Here we show that the consequent middle magnetosphere field is quasi-dipolar in form when the magnetospher…
The qWR star HD 45166. II. Fundamental stellar parameters and evidence of a latitude-dependent wind
Oliveira, A. S.; Steiner, J. E.; Groh, J. H.
Context: The enigmatic object HD 45166 is a qWR star in a binary system with an orbital period of 1.596 day, and presents a rich emission-line spectrum in addition to absorption lines from the companion star (B7 V). As the system inclination is very small (i=0.77° ± 0.09°), HD 45166 is an ideal laboratory for wind-structure studies.
Aims: The …
The mass distribution of RX J1347-1145 from strong lensing
Schrabback, T.; Bradač, M.; Lombardi, M. +5 more
Aims:We determine the central mass distribution of galaxy cluster RX J1347-1145 using strong gravitational lensing.
Methods: High-resolution HST/ACS images of the galaxy cluster RX J1347-1145 have enabled us to identify several new multiple-image candidates in the cluster, including a 5-image system with a central image. The multiple-images al…
Surface-Focused Seismic Holography of Sunspots: I. Observations
Birch, A. C.; Braun, D. C.
We present a comprehensive set of observations of the interaction of p-mode oscillations with sunspots using surface-focused seismic holography. Maps of travel-time shifts, relative to quiet-Sun travel times, are shown for incoming and outgoing p modes as well as their mean and difference. We compare results using phase-speed filters with results …
Magnetic configurations of the tilted current sheets in magnetotail
Malova, H. V.; Lucek, E.; Carr, C. +5 more
In this research, the geometrical structures of tilted current sheet and tail flapping waves have been analysed based on multiple spacecraft measurements and some features of the tilted current sheets have been made clear for the first time. The geometrical features of the tilted current sheet revealed in this investigation are as follows: (1) The…
Surface brightness variations seen by VIRTIS on Venus Express and implications for the evolution of the Lada Terra region, Venus
Drossart, Pierre; Piccioni, Giuseppe; Helbert, Jörn +3 more
Venus Express is since April 11, 2006 in orbit around Venus. VIRTIS (Visible and Infrared Thermal Imaging Spectrometer) has started only hours after orbit insertion to collect an immense and unique data set. Of special interest is the wavelength range from 1-1.5 microns which includes the ``atmospheric windows''. By averaging several hundred multi…
Two new intermediate polars with a soft X-ray component
Mukai, K.; Gänsicke, B. T.; de Martino, D. +4 more
Aims: We analyze the first X-ray observations with XMM-Newton of 1RXS J070407.9+262501 and 1RXS 180340.0+401214, in order to characterize their broad-band temporal and spectral properties, also in the UV/optical domain, and to confirm them as intermediate polars.
Methods: For both objects, we performed a timing analysis of the X-ray and UV/opt…
Titan's winter polar vortex structure revealed by chemical tracers
Irwin, P. G. J.; Teanby, N. A.; Calcutt, S. B. +10 more
The winter polar vortex on Saturn's largest moon Titan has profound effects on atmospheric circulation and chemistry and for the current northern midwinter season is the major dynamical feature of Titan's stratosphere and mesosphere. We use 2 years of observations from Cassini's composite infrared spectrometer to determine cross sections of five i…
Mapping and interpretation of Sinlap crater on Titan using Cassini VIMS and RADAR data
Sotin, Christophe; Barnes, Jason W.; Le Mouélic, Stéphane +15 more
Only a few impact craters have been unambiguously detected on Titan by the Cassini-Huygens mission. Among these, Sinlap is the only one that has been observed both by the RADAR and VIMS instruments. This paper describes observations at centimeter and infrared wavelengths which provide complementary information about the composition, topography, an…
Transiting exoplanets from the CoRoT space mission. V. CoRoT-Exo-4b: stellar and planetary parameters
Mazeh, T.; Aigrain, S.; Alonso, R. +42 more
Aims: The CoRoT satellite has announced its fourth transiting planet (Aigrain et al. 2008, A&A, 488, L43) with space photometry. We describe and analyse complementary observations of this system performed to establish the planetary nature of the transiting body and to estimate the fundamental parameters of the planet and its parent star.
M…