Search Publications
Titan's surface spectra at the Huygens landing site and Shangri-La
Le Mouélic, S.; Sotin, C.; D'Aversa, E. +6 more
Titan is an icy satellite of Saturn with a dense atmosphere and covered by a global photochemical organic haze. Ground based observations and the Huygens descent probe allowed to retrieve the main spectral signature of the water ice (Griffith, C.A. et al. [2003]. Science 300(5619), 628-630; Coustenis, A. et al. [2005]. Icarus 177, 89-105) at the s…
Extinction law at a distance up to 25 kpc toward the Galactic poles
Gontcharov, G. A.
Photometry from the Tycho-2, 2MASS, andWISE catalogues for clump and branch giants at a distance up to 25 kpc toward the Galactic poles has allowed the variations of various characteristics of the infrared interstellar extinction law with distance to be analyzed. The results obtained by the extinction law extrapolation method are consistent for di…
Masses of the components of SB2s observed with Gaia - II. Masses derived from PIONIER interferometric observations for Gaia validation
Mazeh, T.; Grellmann, R.; Tal-Or, L. +15 more
In anticipation of the Gaia astrometric mission, a sample of spectroscopic binaries is being observed since 2010 with the Spectrograph pour l'Observation des PHénomènes des Intérieurs stellaires et des Exoplanètes (SOPHIE) spectrograph at the Haute-Provence Observatory. Our aim is to derive the orbital elements of double-lined spectroscopic binari…
Radial Distribution of ISM Gas-phase Metallicity in CLASH Clusters at z ~ 0.35: A New Outlook on Environmental Impact on Galaxy Evolution
Kewley, Lisa J.; Tran, Kim-Vy H.; Gupta, Anshu +3 more
We present the first observation of cluster-scale radial metallicity gradients from star-forming galaxies. We use DEIMOS on the Keck II telescope to observe two CLASH clusters at z ∼ 0.35: MACS J1115+0129 and RX J1532+3021. Based on our measured interstellar medium properties of star-forming galaxies out to a radius of 2.5 Mpc from the cluster cen…
IR excesses around nearby Lambda Boo stars are caused by debris discs rather than ISM bow waves
Wyatt, M. C.; Venn, K. A.; Matthews, B. C. +3 more
Lambda Boo stars are predominately A-type stars with solar abundant C, N, O, and S, but up to 2 dex underabundances of refractory elements. The stars' unusual surface abundances could be due to a selective accretion of volatile gas over dust. It has been proposed that there is a correlation between the Lambda Boo phenomenon and IR excesses which a…
Challenges associated with near-Earth nightside current
Liemohn, Michael W.; Welling, Daniel T.; Ilie, Raluca +1 more
Every magnetic field of solar and planetary space environments is associated with a current of differentially flowing charged particles. Electric potential patterns in geospace and near other planets are also closely linked with currents. Close to the Earth, particularly in the near-Earth nightside magnetosphere, several current systems wax and wa…
Suzaku observations of a shock front tracing the western edge of the giant radio halo in the Coma Cluster
Allen, Steven W.; Takahashi, Tadayuki; Ichinohe, Yuto +5 more
We present the results of new Suzaku observations of the Coma Cluster, the X-ray brightest, nearby, merging system hosting a well-studied, typical giant radio halo. It has been previously shown that, on the western side of the cluster, the radio brightness shows a much steeper gradient compared to other azimuths. XMM-Newton and Planck revealed a s…
The Storm of Decameter Spikes During the Event of 14 June 2012
Rucker, H. O.; Poedts, S.; Zarka, P. +8 more
An event on 14 June 2012, observed with the radio telescopes UTR-2 (Kharkov, Ukraine), URAN-2 (Poltava, Ukraine), and NDA (Nançay, France) during a joint Summer campaign, is analyzed and discussed. The high solar activity resulted in a storm of spikes, and a storm of Type III bursts, Type IIIb bursts, and a Type IV burst observed in the decameter …
Red, Straight, no bends: primordial power spectrum reconstruction from CMB and large-scale structure
Verde, Licia; Cuesta, Antonio J.; Ravenni, Andrea
We present a minimally parametric, model independent reconstruction of the shape of the primordial power spectrum. Our smoothing spline technique is well-suited to search for smooth features such as deviations from scale invariance, and deviations from a power law such as running of the spectral index or small-scale power suppression. We use a com…
Numerical predictions for planets in the debris discs of HD 202628 and HD 207129
Maddison, S. T.; Thilliez, E.
Resolved debris disc images can exhibit a range of radial and azimuthal structures, including gaps and rings, which can result from planetary companions shaping the disc by their gravitational influence. Currently, there are no tools available to determine the architecture of potential companions from disc observations. Recent work by Rodigas, Mal…