Search Publications
Multispacecraft observation of electron beam in reconnection region
Escoubet, C. P.; Lavraud, B.; Fazakerley, A. N. +6 more
On the 18th of August 2002, during a crossing of the near-Earth plasma sheet Cluster observed an ion flow burst, caused by a near-Earth reconnection event. Cluster observed a tailward bulk flow which reverse to earthward flow, indicating a close passage of the diffusion region. We show that reversals in BZ and BY are consiste…
Multi-wavelength observations of a nearby multi-phase interstellar cloud
Boulanger, F.; Falgarone, E.; Le Bourlot, J. +3 more
Aims: High-resolution spectroscopic observations (UV HST/STIS and optical) are used to characterize the physical state and velocity structure of the multiphase interstellar medium seen towards the nearby (170 pc) star HD 102065. The star is located behind the tail of a cometary-shaped, infrared cirrus-cloud, in the area of interaction between the …
Hubble Space Telescope Search for M Subdwarf Binaries
Gizis, John E.; Riaz, Basmah; Samaddar, Debasmita
We present HST ACS observations of 19 nearby M subdwarfs in a search for binary systems. Other than the wide common proper-motion pair LHS 2140/2139, none of our sdM and esdM targets are found to be binaries. Our survey is sensitive to equal-luminosity companions at close (2-8 AU) separations, while substellar secondaries could have been detected …
Stellar mass estimates in early-type galaxies from lensing+dynamical and photometric measurements
Grillo, C.; Rosati, P.; Lombardi, M. +1 more
Aims:Our purpose is to compare two different diagnostics for estimating stellar masses in early-type galaxies and to establish their level of reliability. In particular, we consider the well-studied sample of 15 field elliptical galaxies selected from the Sloan Lens ACS (SLACS) Survey (z = 0.06-0.33). We examine here the correlation between the st…
A Simulation of a Coronal Mass Ejection Propagation and Shock Evolution in the Lower Solar Corona
Gombosi, T. I.; Cohen, O.; Opher, M. +2 more
We present a detailed simulation of the evolution of a moderately slow coronal mass ejection (CME; 800 km s-1 at 5 R⊙, where R⊙ is solar radii) in the lower solar corona (2-5 R⊙). The configuration of the Sun's magnetic field is based on the MDI data for the solar surface during Carrington rotation 1922.…
Magnetosphere ionosphere coupling during the CME events of 07 12 November 2004
Reme, H.; Walker, S.; Alleyne, H. +3 more
The response of the magnetosphere and ionosphere to the coronal mass ejection (CME) events during the period 07-12 November 2004 is studied using Cluster and ground-based (ESR, EISCAT and Jicamarca radars and magnetometer) observations. The coordinated observations provide a good example of the magnetosphere-ionosphere coupling through prompt pene…
Changing Characteristics of Jupiter's Little Red SPOT
Baines, K. H.; Pantin, E.; Stern, S. A. +12 more
The Little Red Spot (LRS) in Jupiter's atmosphere was investigated in unprecedented detail by the New Horizons spacecraft together with the Hubble Space Telescope (HST) and the Very Large Telescope (VLT). The LRS and the larger Great Red Spot (GRS) of Jupiter are the largest known atmospheric storms in the solar system. Originally a white oval, th…
The X-Ray Properties of Moderate-Redshift Galaxy Groups Selected by Association with Gravitational Lenses
McKean, J. P.; Auger, M. W.; Mulchaey, J. S. +5 more
We present results from a systematic investigation of the X-ray properties of a sample of moderate-redshift (0.3 < z < 0.6) galaxy groups. These groups were selected not by traditional X-ray or optical search methods, but rather by an association, either physical or along the line of sight, with a strong gravitational lens. We calculate the …
New laboratory measurements of CH 4 in Titan's conditions and a reanalysis of the DISR near-surface spectra at the Huygens landing site
Lellouch, E.; Bézard, B.; Coustenis, A. +5 more
Laboratory spectra of methane-nitrogen mixtures have been recorded in the near-infrared range (1.0-1.65 µm) in conditions similar to Titan's near surface, to facilitate the interpretation of the DISR/DLIS (DISR - Descent Imager/Spectral Radiometer) spectra taken during the last phase of the descent of the Huygens Probe, when the surface was …
Improved estimates of the physical properties of the O-star binary V1007 Sco = HD 152248 and notes on several other binaries in the NGC 6231 cluster
Wolf, M.; Morrell, N.; Harmanec, P. +4 more
Context: In spite of the importance of massive O-type stars for astrophysics, their accurate masses and other fundamental properties are still a matter of debate. Determining them reliably is hampered by various factors (stellar winds and other forms of circumstellar matter), and the agreement of derived properties with the model predictions is fa…