Search Publications
Dynamical history of a binary cluster: Abell 3653
Hudaverdi, Murat; Caglar, Turgay
We study the dynamical structure of a bimodal galaxy cluster Abell 3653 at z = 0.1089 using optical and X-ray data. Observations include archival data from the Anglo-Australian Telescope, X-ray observatories XMM-Newton and Chandra. We draw a global picture for A3653 using galaxy density, X-ray luminosity and temperature maps. The galaxy distributi…
Beaming of intense AKR seen from the Interball-2 spacecraft
Panchenko, M.; Mutel, R.; Christopher, I. +2 more
We present results of intense auroral kilometric radiation (AKR) sources direction finding based on single-spacecraft k→ vector source location performed in the frame of Interball-2 mission (POLRAD experiment on board Auroral Probe). With our swept frequency analyzer we are not able to work with single AKR bursts generated in small, elementary sou…
Measuring Velocities in the Early Stage of an Eruption: Using “Overlappogram” Data from Hinode EIS
Warren, Harry; Harra, Louise K.; Doschek, George A. +4 more
In order to understand the onset phase of a solar eruption, plasma parameter measurements in the early phases are key to constraining models. There are two current instrument types that allow us to make such measurements: narrow-band imagers and spectrometers. In the former case, even narrow-band filters contain multiple emission lines, creating s…
Aerosols optical properties in Titan's detached haze layer before the equinox
West, Robert A.; Seignovert, Benoît; Lavvas, Panayotis +2 more
UV observations with Cassini ISS Narrow Angle Camera of Titan's detached haze is an excellent tool to probe its aerosols content without being affected by the gas or the multiple scattering. Unfortunately, its low extent in altitude requires a high resolution calibration and limits the number of images available in the Cassini dataset. However, we…
The interplanetary magnetic field observed by Juno enroute to Jupiter
Connerney, John E. P.; Gruesbeck, Jacob R.; Gershman, Daniel J. +1 more
The Juno spacecraft was launched on 5 August 2011 and spent nearly 5 years traveling through the inner heliosphere on its way to Jupiter. The Magnetic Field Investigation was powered on shortly after launch and obtained vector measurements of the interplanetary magnetic field (IMF) at sample rates from 1 to 64 samples/second. The evolution of the …
Short time-scale variables in the Gaia era: detection and characterization by structure function analysis
Wevers, Thomas; Rimoldini, Lorenzo; Mowlavi, Nami +7 more
We investigate the capabilities of the ESA Gaia mission for detecting and characterizing short time-scale variability, from tens of seconds to a dozen hours. We assess the efficiency of the variogram analysis, for both detecting short time-scale variability and estimating the underlying characteristic time-scales from Gaia photometry, through exte…
The K2-ESPRINT project. VI. K2-105 b, a hot Neptune around a metal-rich G-dwarf
Tamura, Motohide; Hirano, Teruyuki; Sato, Bun'ei +17 more
We report on the confirmation that the candidate transits observed for the star EPIC 211525389 are due to a short-period Neptune-sized planet. The host star, located in K2 campaign field 5, is a metal-rich ([Fe/H] = 0.26 ± 0.05) G-dwarf (Teff = 5430 ± 70 K and log g = 4.48 ± 0.09), based on observations with the High Dispersion Spectrog…
On-Ground Performance and Calibration of the ExoMars Trace Gas Orbiter CaSSIS Imager
Cremonese, G.; Da Deppo, V.; Thomas, N. +22 more
The European Space Agency's ExoMars Trace Gas Orbiter (TGO) seeks to investigate the biological or geological origin of trace gases found on Mars. The TGO carries a payload of four instruments in order to reach its scientific goals, including the Colour and Stereo Surface Imaging System (CaSSIS). CaSSIS is a colour and stereo telescopic camera tha…
Relation of CME Speed and Magnetic Helicity in CME Source Regions on the Sun during the Early Phase of Solar Cycles 23 and 24
Cho, K. -S.; Jang, S.; Kim, R. -S. +2 more
To investigate the relations between coronal mass ejection (CME) speed and magnetic field properties measured in the photospheric surface of CME source regions, we selected 22 disk CMEs in the rising and early maximum phases of the current Solar Cycle 24. For the CME speed, we used two-dimensional (2D) projected speed observed by the Large Angle a…
Wide- and contact-binary formation in substructured young stellar clusters
Moraux, E.; Dorval, J.; Boily, C. M. +1 more
We explore with collisional gravitational N-body models the evolution of binary stars in initially fragmented and globally subvirial clusters of stars. Binaries are inserted in the (initially) clumpy configurations so as to match the observed distributions of the field-binary-stars' semimajor axes a and binary fraction versus primary mass. The dis…