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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…
Multiple and Precessing Collimated Outflows in the Planetary Nebula IC 4634
Guerrero, Martín A.; Chu, You-Hua; Miranda, Luis F. +6 more
With its remarkable double-S shape, IC 4634 is an archetype of point-symmetric planetary nebulae (PNe). In this paper, we present a detailed study of this PN using archival HST WFPC2 and ground-based narrowband images to investigate its morphology, and long-slit spectroscopic observations to determine its kinematics and to derive its physical cond…
AKARI/FIS Mapping of the ISM-Wind Bow Shock around α Orionis
Yamamura, Issei; Matsunaga, Noriyuki; Mito, Hiroyuki +7 more
We present 10' × 50'scan maps around an M supergiant αOri at 65, 90, 140, and 160µm obtained with the AKARI Infrared Astronomy Satellite. Higher spatial resolution data with the exact analytic solution permit us to fit the de-projected shape of the stellar-wind bow shock around αOri to have a stand-off distance of 4'.8, position angle of 55°…
L-Dwarf Binaries in the 20-Parsec Sample
Burgasser, Adam J.; Reid, I. Neill; Liu, Michael C. +1 more
We have used the NICMOS NIC1 camera on the Hubble Space Telescope to obtain high-resolution near-infrared images of 27 nearby ultracool dwarfs with formal distance estimates less than 20 parsecs. One target, 2MASS J22551861-5713056, is resolved as a binary system, with a 4:1 flux ratio in the F110W passband. The primary has spectral type L6, and t…