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Dayside thermal structure of Venus' upper atmosphere characterized by a global model
Brecht, A. S.; Bougher, S. W.
Observations of Venus' dayside thermal structure are being conducted through ground based observatories. These temperature measurements, along with those from several instruments onboard the current Venus Express mission, are augmenting the previous thermal structure data from past missions (e.g., Veneras', Pioneer Venus Orbiter, Pioneer Venus Pro…
Iron mineralogy of the surface of Mars from the 1 µm band spectral properties
Bibring, J. -P.; Poulet, F.; Bellucci, G. +3 more
We study the 1 µm absorption from OMEGA/MEX spectra to map Martian iron mineralogy at a global scale. This band is covered on the left by the VNIR (visible and near infrared) OMEGA channel and on the right by the SWIR (short wavelengths infrared) one. We first perform a systematic spatial coregistration of the two channels after an improveme…
Upper ionosphere of Mars is not axially symmetrical
Gurnett, D. A.; Barabash, S.; Lundin, R. +6 more
The measurements carried out by the ASPERA-3 and MARSIS experiments on board the Mars Express (MEX) spacecraft show that the upper Martian ionosphere (h ≥ 400 km) is strongly azimuthally asymmetrical. There are several factors, e.g., the crustal magnetization on Mars and the orientation of the interplanetary magnetic field (IMF) which c…
HST/STIS spectroscopy of the magnetic Of?p star HD 108: the low state at ultraviolet wavelengths
Bouret, J. -C.; Howarth, I. D.; Hillier, D. J. +6 more
We present the first ultraviolet spectrum of the peculiar, magnetic Of?p star HD 108 obtained in its spectroscopic low state. The new data, obtained with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope, reveal significant changes compared to IUE spectra obtained in the high state: N Vλ1240, Si IVλ1400 and C IVλ1550 pr…
Asymmetric magnetosphere deformation driven by hot flow anomaly(ies)
Němeček, Z.; Šafránková, J.; Přech, L. +2 more
We present a case study of a large deformation of the magnetopause on November 26, 2008. The investigation is based on observations of five THEMIS spacecraft located at the dawn flank in the magnetosphere and magnetosheath, on Cluster measurements at the dusk magnetosheath, and is supported by ACE solar wind monitoring. The main revelation of our …
Refinements in the data analysis of VIRTIS-M-IR Venus nightside spectra
Drossart, Pierre; Piccioni, Giuseppe; Haus, Rainer +2 more
The successful long-duration radiation measurements performed by the VIRTIS instrument aboard ESA's Venus Express spacecraft have provided an excellent collection of atmospheric and surface data that stand out due to their high temporal and spatial coverage of the planet and due to a high diversity of measurement and environmental conditions. A de…
Sublimation-driven erosion on Hyperion: Topographic analysis and landform simulation model tests
Schenk, Paul M.; White, Oliver L.; Moore, Jeffrey M. +2 more
The unique appearance of Hyperion can be explained in part by the loss to space of ballistic ejecta during impact events, as was proposed by Thomas et al. (Thomas, P.C. et al. [2007a]. Icarus 190, 573-584). We conclude that such loss is a partial explanation, accounting for the lack of appreciable intercrater plains on a saturation-cratered surfac…
GALEX-selected Lyman Break Galaxies at z ~ 2: Comparison with Other Populations
Nesvadba, N.; Haberzettl, L.; Lehnert, M. D. +2 more
We present results of a search for bright Lyman break galaxies (LBGs) at 1.5 <= z <= 2.5 in the GOODS-S field using an NUV-dropout technique in combination with color selection. We derived a sample of 73 LBG candidates. We compare our selection efficiencies to BM/BX and BzK methods (techniques solely based on ground-based data sets), and fin…
Possible optical counterpart of PSR J1357-6429
Mennickent, R. E.; Zharikov, S.; Kirichenko, A. +4 more
Context. PSR J1357-6429 is a Vela-like radio pulsar that has been recently detected in X-rays and γ-rays. It powers a compact tail-like X-ray pulsar wind nebula and X-ray-radio plerion associated with an extended TeV source HESS J1356-645.
Aims: We present our deep optical observations with the Very Large Telescope to search for an optical co…
CO and H2 Absorption in the AA Tauri Circumstellar Disk
Herczeg, Gregory J.; Brown, Alexander; France, Kevin +7 more
The direct study of molecular gas in inner protoplanetary disks is complicated by uncertainties in the spatial distribution of the gas, the time variability of the source, and the comparison of observations across a wide range of wavelengths. Some of these challenges can be mitigated with far-ultraviolet spectroscopy. Using new observations obtain…