Search Publications
Cluster as current sheet surveyor in the magnetotail
Nakamura, R.; Baumjohann, W.; Narita, Y.
A novel analysis technique is presented to estimate the current sheet thickness unambiguously and directly, without associating time series data with spatial structure. The technique is a combination of eigenvalue analysis and minimum variance estimator adapted to Harris current sheet geometry, and needs one-time, four-point magnetic field data as…
Jupiter's Great Red Spot: Fine-scale matches of model vorticity patterns to prevailing cloud patterns
Dowling, Timothy E.; Morales-Juberías, Raúl
We report on a set of six new matches between fine-scale features in the vorticity field of a three-dimensional (3D), primitive-equation, finite-difference model of Jupiter's Great Red Spot that includes no clouds or cloud physics, and quasi-permanent structures in reflected visible-band images of the clouds. These add to similar success by Cho et…
Companions to nearby Stars with Astrometric Acceleration. II
Tokovinin, Andrei; Hayward, Thomas L.; Hartung, Markus
Hipparcos astrometric binaries were observed with the NICI adaptive optics system at Gemini-S, completing the work of Paper I. Among the 65 F, G, and K dwarfs within 67 pc of the Sun studied here, we resolve 18 new subarcsecond companions, remeasure 7 known astrometric pairs, and establish the physical nature of yet another 3 wider companions. The…
Implications of the Planck bispectrum constraints for the primordial trispectrum
Byrnes, Christian T.; Nurmi, Sami; Tasinato, Gianmassimo +1 more
The new Planck constraints on the local bispectrum parameter f_NL are about 105 times tighter than the current constraints on the trispectrum parameter g_NL , which means that the allowed numerical values of the second-and third-order terms in the perturbative expansion of the curvature perturbation are comparable. We show that a conseq…
The production of craters on the mid-sized Saturnian satellites by Centaur objects
Di Sisto, R. P.; Zanardi, M.
Context. The Saturnian satellite system has been observed in detail by the Cassini-Huygens mission. These satellites present different surface features, including impact craters caused by small objects probably coming from the trans-Neptunian region.
Aims: In this paper we calculate the production of craters on the mid-sized Saturnian satelli…
Radio emission at the centre of the galaxy cluster Abell 3560: evidence for core sloshing?
Rossetti, M.; Giacintucci, S.; Venturi, T. +4 more
Context. We study the interplay between the radio emission associated with the dominant galaxy in clusters and the properties of the surrounding intracluster medium on the basis of its X-ray emission.
Aims: Previous radio observations of the galaxy cluster A 3560, located in the Shapley Concentration core, revealed complex radio emission asso…
Multiwavelength Observations of the Black Hole Transient XTE J1752-223 during Its 2010 Outburst Decay
Tomsick, J. A.; Corbel, S.; Kalemci, E. +6 more
Galactic black hole transients show many interesting phenomena during outburst decays. We present simultaneous X-ray (RXTE, Swift, and INTEGRAL), and optical/near-infrared (O/NIR) observations (SMARTS) of the X-ray transient XTE J1752-223 during its outburst decay in 2010. The multiwavelength observations over 150 days in 2010 cover the transition…
The HIPPARCOS parallax for Polaris
van Leeuwen, F.
This Letter follows a recent claim that the Hipparcos parallax for Polaris could be too small by 2.5 mas. It examines in detail the Hipparcos epoch astrometric data for Polaris, as well as the viability of other observations that were put forward to support a larger parallax. The Hipparcos determination of the Polaris parallax is shown to be suffi…
A geological characterization of Ligeia Mare in the northern polar region of Titan
Chevrier, V. F.; Wasiak, F. C.; Androes, D. +3 more
Ligeia Mare, the second largest sea on Titan, resides in an endorheic basin dominated by seas in the northeastern polar region. Ligeia's shoreline morphology resembles terrestrial man-made reservoirs where water is dammed and valleys are flooded. Here we describe the mare and surrounding geologically diverse terrain including rugged highlands and …
The interplanetary magnetic field: Radial and latitudinal dependences
Khabarova, O. V.
Results of the analysis of spacecraft measurements at 1-5.4 AU are presented within the scope of the large-scale interplanetary magnetic field (IMF) structure investigation. The work is focused on revealing of the radial IMF component ( B r ) variations with heliocentric distance and latitude as seen by Ulysses. It was found out that |…