Search Publications
Morphological and mechanical characterization of gullies in a periglacial environment: The case of the Russell crater dune (Mars)
Lucas, Antoine; Schmidt, Frédéric; Costard, François +4 more
Gullies on terrestrial sand dunes are rare, and their presence on Mars, as well as their mechanical properties, and the quantity of fluid required for their formations currently remain poorly understood. This study focuses on gully morphologies on the Russell megadune (54.5°S; 12.7°E) using High Resolution Imaging Science Experiment (HiRISE) image…
Polar bulges and polar nuclear discs: the case of NGC 4698
Morelli, L.; Beifiori, A.; Dalla Bontà, E. +5 more
The early-type spiral NGC 4698 is known to host a nuclear disc of gas and stars which is rotating perpendicularly with respect to the galaxy main disc. In addition, the bulge and main disc are characterized by a remarkable geometrical decoupling. Indeed, they appear elongated orthogonally to each other. In this work, the complex structure of the g…
Rotational motion of Phobos
Rosenblatt, P.; Le Maistre, S.; Rambaux, N. +1 more
Context. Phobos is in synchronous spin-orbit resonance around Mars, like our Moon around the Earth. As a consequence, the rotational period of Phobos is equal in average to its orbital period. The variations of its rotational motion are described by oscillations, called physical librations, which yield information of its interior structure. The la…
Water emission from the chemically rich outflow L1157
Liseau, R.; Codella, C.; van Dishoeck, E. F. +7 more
Context. In the framework of the Herschel-WISH key program, several ortho-H2O and para-H2O emission lines, in the frequency range from 500 to 1700 GHz, were observed with the HIFI instrument in two bow-shock regions (B2 and R) of the L1157 cloud, which hosts what is considered to be the prototypical chemically-rich outflow. <…
Asymptotic Giant Branch variables in the Galaxy and the Local Group
Whitelock, Patricia A.
AGB variables, particularly the large amplitude Mira type, are a vital step on the distance scale ladder. They will prove particularly important in the era of space telescopes and extremely large ground-based telescopes with adaptive optics, which will be optimized for infrared observing. Our current understanding of the distances to these stars i…
Modeling specular reflections from hydrocarbon lakes on Titan
Nicholson, Philip D.; Sotin, Christophe; Barnes, Jason W. +9 more
During the 58th close flyby of Titan (T58), the Cassini Visual and Infrared Mapping Spectrometer (VIMS) observed a specular reflection of sunlight from Titan's Jingpo Lacus through the 5-µm methane window (Stephan, K. et al. [2010]. Geophys. Res. Lett. 37, L07104). The maximum intensity of this reflection is controlled by three basic factors…
Gas Density Profile in Dark Matter Halo in Chameleon Cosmology
Terukina, Ayumu; Yamamoto, Kazuhiro
We investigate the gas density, temperature, and pressure profiles in a dark matter halo under the influence of the chameleon force. We solve the hydrostatic equilibrium equation for the gas coupled with the chameleon field in an analytic manner, using an approximate solution for the chameleon field equation with the source term, with a generalize…
The Y SZ-YX Scaling Relation as Determined from Planck and Chandra
Vikhlinin, Alexey; More, Surhud; Rozo, Eduardo
Sunyaev-Zeldovich (SZ) clusters surveys, such as Planck, the South Pole Telescope, and the Atacama Cosmology Telescope, will soon be publishing several hundred SZ-selected systems. The key ingredient required to transport the mass calibration from current X-ray-selected cluster samples to these SZ systems is the Y SZ-YX scali…
Thermal and shape properties of asteroid (21) Lutetia from Herschel observations around the Rosetta flyby
Altieri, B.; Valtchanov, I.; Jorda, L. +22 more
Prior to and around the Rosetta flyby of (21) Lutetia, the Herschel Space Observatory performed a collaborative observation campaign with its two photometers observing the asteroid in the far infrared, at wavelengths not covered by Rosetta's instruments. The Herschel observations, fed into a thermophysical model (TPM) using as input a shape model …
The detection of globular clusters in galaxies as a data mining problem
Paolillo, Maurizio; Puzia, Thomas; Brescia, Massimo +2 more
We present an application of self-adaptive supervised learning classifiers derived from the machine learning paradigm to the identification of candidate globular clusters in deep, wide-field, single-band Hubble Space Telescope (HST) images. Several methods provided by the DAta Mining and Exploration (DAME) web application were tested and compared …