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Electric properties and related physical characteristics of the atmosphere and surface of Titan
Lara, L. M.; Rodrigo, R.; López-Moreno, J. J. +17 more
The permittivity, waves and altimetry (PWA) instrument was designed for the investigation of the electric properties and other related physical characteristics of the atmosphere of Titan, from an altitude around 140 km down to the surface. PWA carried sensors to measure the atmospheric conductivity, and record electromagnetic and acoustic waves up…
HST NICMOS Imaging of the Planetary-mass Companion to the Young Brown Dwarf 2MASSW J1207334-393254
Zuckerman, B.; Song, Inseok; Schneider, G. +5 more
Multiband (0.9-1.6 µm) images of the TW Hydrae association (TWA) brown dwarf 2MASSW J1207334-393254 (also known as 2M 1207) and its candidate planetary-mass companion (2M 1207b) were obtained on 2004 August 28 and 2005 April 26 with HST NICMOS. The images from these two epochs unequivocally confirm the two objects as a common proper motion p…
Observations of a soft X-ray rising loop associated with a type II burst and a coronal mass ejection in the 03 November 2003 X-ray flare
Krucker, S.; Vilmer, N.; Dauphin, C.
Context: .We report observations of a type II burst - the signature of a shock wave - starting at the unusual high frequency of 650 MHz during the 03 November 2003 flare. This flare is associated with the propagation of a soft X-ray coronal loop and with a coronal mass ejection (CME).
Aims: .We study in this paper the origin of the shock wave …
An XMM-Newton observation of the young open cluster NGC 2547: coronal activity at 30 Myr
Briggs, K. R.; Jeffries, R. D.; Evans, P. A. +1 more
We report on XMM-Newton observations of the young open cluster NGC 2547 which allow us to characterize coronal activity in solar-type stars, and stars of lower mass, at an age of 30 Myr. X-ray emission is seen from stars at all spectral types, peaking among G stars at luminosities (0.3-3 keV) of Lx≃ 1030.5 erg s-1 …
Electric fields within the martian magnetosphere and ion extraction: ASPERA-3 observations
Kallio, E.; Fedorov, A.; Säles, T. +37 more
Observations made by the ASPERA-3 experiment onboard the Mars Express spacecraft found within the martian magnetosphere beams of planetary ions. In the energy ( E/q)-time spectrograms these beams are often displayed as dispersive-like, ascending or descending (whether the spacecraft moves away or approach the planet) structures. A linear dependenc…
First results from the ionospheric radio occultations of Saturn by the Cassini spacecraft
Anabtawi, Aseel; Barbinis, Elias; Fleischman, Don +9 more
The first set of near-equatorial occultations of the Saturn ionosphere was obtained by the Cassini spacecraft between May and September of 2005. The occultations occurred at near-equatorial latitudes, between 10°N and 10°S, at solar zenith angles from about 84° to 96°. The entry observations correspond to dusk conditions and the exit ones to dawn.…
From Radio to X-Ray: The Quiescent Atmosphere of the dMe Flare Star EV Lacertae
Hawley, Suzanne L.; Harper, Graham M.; Brown, Alexander +3 more
We report on multiwavelength observations spanning radio to X-ray wavelengths of the M dwarf flare star EV Lacertae and probing the characteristics of the outer atmospheric plasma from the upper chromosphere to the corona. We detect the star at a wavelength of 2 cm (15 GHz) for the first time. UV and FUV line profiles show evidence of nonthermal b…
Permitted Oxygen Abundances and the Temperature Scale of Metal-poor Turnoff Stars
Meléndez, Jorge; Shchukina, Nataliya G.; Vasiljeva, Irina E. +1 more
We use high-quality VLT/UVES published data of the permitted O I triplet and Fe II lines to determine oxygen and iron abundances in unevolved (dwarfs, turnoff, subgiants) metal-poor halo stars. The calculations have been performed both in LTE and non-LTE (NLTE), employing effective temperatures obtained with the new infrared flux method (IRFM) tem…
Large-Scale Zonal Flows Near the Solar Surface
Thompson, M. J.; Howe, R.; Komm, R. +5 more
Migrating bands of weak, zonal flow, associated with the activity bands in the solar cycle, have been observed at the solar surface for some time. More recently, these flows have been probed deep within the convection zone using global helioseismology and examined in more detail close to the surface with the techniques of local helioseismology. We…
Masses of Astrometrically Discovered and Imaged Binaries: G78-28AB and GJ 231.1BC
Ireland, Michael J.; Martinache, Frantz; Lloyd, James P. +5 more
The Stellar Planet Survey (STEPS) is an ongoing astrometric search for giant planets and brown dwarfs around a sample of ~30 M dwarfs. We have discovered several low-mass companions by measuring the motion of our target stars relative to their reference frames. The highest mass discovery thus far is G78-28B, a companion to the M dwarf G78-28A. The…