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CHARA Array Measurements of the Angular Diameters of Exoplanet Host Stars
Goldfinger, P. J.; McAlister, Harold A.; ten Brummelaar, Theo A. +5 more
We have measured the angular diameters for a sample of 24 exoplanet host stars using Georgia State University's CHARA Array interferometer. We use these improved angular diameters together with Hipparcos parallax measurements to derive linear radii and to estimate the stars' evolutionary states.
Solar forcing and planetary ion escape from Mars
Fedorov, A.; Barabash, S.; Lundin, R. +4 more
The variability of planetary ion escape from Mars is studied using data from the Ion Mass Analyzer, IMA, on Mars Express (MEX). 42 orbits were selected during 17 months for different solar wind conditions, focusing on the low energy (~30 - 800 eV) heavy ion (e.g. O+, O2 + and CO2 +) outflow. A…
UV Io footprint leading spot: A key feature for understanding the UV Io footprint multiplicity?
Saur, J.; Bonfond, B.; Gérard, J. -C. +3 more
The electromagnetic interaction between Io and the Jovian magnetosphere generates a UV auroral footprint in both Jovian hemispheres. Multiple spots were observed in the northern Jovian hemisphere when Io was in the northern part of the plasma torus and vice-versa for the South. Based on recent Hubble Space Telescope (HST) measurements, we report h…
Cool X-ray emitting gas in the core of the Centaurus cluster of galaxies
Fabian, A. C.; Allen, S. W.; Sanders, J. S. +3 more
We use a deep XMM-Newton Reflection Grating Spectrometer observation to examine the X-ray emission from the core of the Centaurus cluster of galaxies. We clearly detect FeXVII emission at four separate wavelengths, indicating the presence of cool X-ray emitting gas in the core of the cluster. Fe ions from FeXVII toXXIV are observed. The ratio of t…
Dust devil speeds, directions of motion and general characteristics observed by the Mars Express High Resolution Stereo Camera
HRSC Co-Investigator Team; Greeley, Ronald; Whelley, Patrick L. +4 more
A total of 205 dust devils were detected in 23 High Resolution Stereo Camera (HRSC) images taken between January 2004 and July 2006 with the ESA Mars Express orbiter, in which average dust devil heights were ∼660 m and average diameters were ∼230 m. For the first time, dust devil velocities were directly measured from orbit, and range from 1 to 59…
The Energy Flux of Internal Gravity Waves in the Lower Solar Atmosphere
McIntosh, Scott W.; Straus, Thomas; Fleck, Bernhard +5 more
Stably stratified fluids, such as stellar and planetary atmospheres, can support and propagate gravity waves. On Earth these waves, which can transport energy and momentum over large distances and can trigger convection, contribute to the formation of our weather and global climate. Gravity waves also play a pivotal role in planetary sciences and …
Direct evidence of a sub-stellar companion around CT Chamaeleontis
Neuhäuser, R.; Schmidt, T. O. B.; Hauschildt, P. H. +5 more
Aims: In our ongoing search for close and faint companions around T Tauri stars in the Chamaeleon star-forming region, we here present observations of a new common proper motion companion to the young T-Tauri star and Chamaeleon member CT Cha and discuss its properties in comparison to other young, low-mass objects and to synthetic model spectra f…
Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71. III. Rapid and correlated flux density variability from radio to sub-mm bands
Grewing, M.; Britzen, S.; Wagner, S. J. +22 more
Aims: The BL Lac object S5 0716+71 was observed in a global multi-frequency campaign to search for rapid and correlated flux density variability and signatures of an inverse-Compton (IC) catastrophe during the states of extreme apparent brightness temperatures.
Methods: The observing campaign involved simultaneous ground-based monitoring at ra…
Oscillation of Saturn's southern auroral oval
Nichols, J. D.; Clarke, J. T.; Cowley, S. W. H. +5 more
Near-planetary-period oscillations in the Cassini plasma and magnetic field data have been observed throughout Saturn's magnetosphere despite the fact that Saturn's internal magnetic field is apparently highly axisymmetric. In addition, the period of the Saturn kilometric radiation has been shown to vary over time. In this paper we present results…
Horizontal structures and dynamics of Titan's thermosphere
Waite, J. H.; Yelle, R. V.; Cui, J. +1 more
The Cassini Ion Neutral Mass Spectrometer (INMS) measures densities of gases including N2 and CH4 in situ in Titan's upper atmosphere. We have used data from 13 targeted flybys of Titan (T5-T32) to construct an empirical model that describes the mean state of the thermosphere in the northern hemisphere, giving the N2