Search Publications
A ground-to-exosphere Martian general circulation model: 2. Atmosphere during solstice conditions—Thermospheric polar warming
Forget, F.; López-Valverde, M. A.; González-Galindo, F. +1 more
A ground-to-exosphere Martian general circulation model is applied to study the thermal and dynamical structure of the upper Martian atmosphere during solstitial conditions. Special attention is paid to the reproduction of the thermospheric polar warming observed by Mars Odyssey during southern hemisphere (SH) summer solstice. The intensity and la…
Photometric changes on Saturn's Titan: Evidence for active cryovolcanism
Drossart, Pierre; Sotin, Christophe; Sicardy, Bruno +30 more
We report infrared spectrophotometric variability on the surface of Saturn's moon Titan detected in images returned by the Visual and Infrared Mapping Spectrometer (VIMS) onboard the Cassini Saturn Orbiter. The changes were observed at 7°S, 138°W and occurred between October 27, 2005 and January 15, 2006. After that date the surface was unchanged …
The orbital velocity anisotropy of cluster galaxies: evolution
Poggianti, B. M.; Biviano, A.
Context: In nearby clusters early-type galaxies follow isotropic orbits. The orbits of late-type galaxies are instead characterized by slightly radial anisotropy. Little is known about the orbits of the different populations of cluster galaxies at redshift z > 0.3.
Aims: We investigate the redshift evolution of the orbits of cluster galaxie…
Constraining the Spin-Down of the Nearby Isolated Neutron Star RX J2143.0+0654
van Kerkwijk, M. H.; Kaplan, D. L.
Magnetic field estimates for nearby isolated neutron stars (INS) help to constrain both the characteristics of the population and the nature of their peculiar X-ray spectra. From a series of XMM -Newton observations of RX J2143.0+0654, we measure a spin-down rate of \dot{ν}= {(-4.6± 2.0) × 10^{-16}} Hz s^{-1}. While this does not allow a definitiv…
An analysis of the transit times of CoRoT-1b
Bean, J. L.
The CoRoT satellite is expected to discover tens of new transiting exoplanets during its mission. For each of these planets there will be a resulting long, continuous sequence of transit times that can be used to search for perturbations arising from an additional planet in the system. I report the results from a study of the transit times for CoR…
A forming, dust-enshrouded disk at z = 0.43: the first example of a massive, late-type spiral rebuilt after a major merger?
Flores, H.; Hammer, F.; Puech, M. +4 more
By combining Ultra Deep Field imagery from HST/ACS with kinematics from VLT/GIRAFFE, we derive a physical model of distant galaxies in a way similar to that achievable for nearby galaxies. A significant part of the evolution in the density of cosmic star formation is related to the rapid evolution of both luminous IR galaxies (LIRGs) and Luminous …
An HST/ACS view of the inhomogeneous outer halo of M31
Mackey, A. D.; Chapman, S. C.; Tanvir, N. R. +6 more
We present a high precision photometric view of the stellar populations in the outer halo of M31, using data taken with the Hubble Space Telescope/Advanced Camera for Surveys. We analyse the field populations adjacent to 11 luminous globular clusters which sample the galactocentric radial range 18 <~ R <~ 100kpc and reach a photometric depth…
Elliptical polarization of Saturn Kilometric Radiation observed from high latitudes
Gurnett, D. A.; Kurth, W. S.; Cecconi, B. +6 more
The high-inclination orbits of the Cassini spacecraft from autumn 2006 until spring 2007 allowed the Cassini/RPWS (Radio and Plasma Wave Science) instrument to observe Saturn Kilometric Radiation (SKR) from latitudes up to 60° for the first time. This has revealed a surprising new property of SKR: above ∼30° in observational latitude, a significan…
The Mean Type Ia Supernova Spectrum Over the Past Nine Gigayears
Gal-Yam, A.; Sullivan, M.; Nugent, P. E. +3 more
We examine the possibility of evolution with redshift in the mean rest-frame ultraviolet (UV; λ lsim 4500 Å) spectrum of Type Ia Supernovae (SNe Ia) sampling the redshift range 0 < z < 1.3. We find new evidence for a decrease with redshift in the strength of intermediate-mass element (IME) features, particularly Si II and to a lesser extent …
HD 100453: A Link Between Gas-Rich Protoplanetary Disks and Gas-Poor Debris Disks
Carmona, A.; Hamaguchi, K.; Henning, Th. +15 more
HD 100453 has an IR spectral energy distribution (SED) which can be fit with a power law plus a blackbody. Previous analysis of the SED suggests that the system is a young Herbig Ae star with a gas-rich, flared disk. We reexamine the evolutionary state of the HD 100453 system by refining its age (based on a candidate low-mass companion) and by exa…