Search Publications
Properties of a Martian local dust storm in Atlantis Chaos from OMEGA/MEX data
Bellucci, G.; Oliva, F.; D'Aversa, E. +5 more
In this study we present the analysis of the dust properties of a local storm imaged in the Atlantis Chaos region on Mars by the OMEGA imaging spectrometer on March 2nd, 2005. We use the radiative transfer model MITRA to study the dust properties at solar wavelengths between 0.5 µm and 2.5 µm and infer the connection between the local …
The long-period massive binary HD 54662 revisited
Rauw, G.; Mahy, L.; Mossoux, E.
Context.
Aims: The goal of this study is to improve our knowledge of the orbital and stellar parameters of
Magnetic Structure of a Composite Solar Microwave Burst
Masuda, Satoshi; Liu, Chang; White, Stephen M. +2 more
A composite flare consisting of an impulsive flare SOL2015-06-21T01:42 (GOES class M2.0) and a more gradual, long-duration flare SOL2015-06-21T02:36 (M2.6) from NOAA Active Region 12371, is studied using observations with the Nobeyama Radioheliograph (NoRH) and the Solar Dynamics Observatory (SDO). While composite flares are defined by their chara…
Chromodynamical analysis of lenticular galaxies using globular clusters and planetary nebulae
Zanatta, Emilio J. B.; Cortesi, Arianna; Chies-Santos, Ana L. +7 more
Recovering the origins of lenticular galaxies can shed light on the understanding of galaxy and compare them with the kinematics of planetary nebulae (PNe). The PNe and GC data come from the Planetary Nebulae Spectrograph and the SLUGGS Surveys. Through photometric spheroid-disc decomposition and PNe kinematics. we find the probability for a given…
Modelling dust rings in early-type galaxies through a sequence of radiative transfer simulations and 2D image fitting
Fritz, J.; Bonfini, P.; González-Martín, O. +3 more
A large fraction of early-type galaxies (ETGs) hosts prominent dust features, and central dust rings are arguably the most interesting among them. We present here `Lord of the Rings', a new methodology which allows to integrate the extinction by dust rings in a 2D-fittingmodelling of the surface brightness distribution. Our pipeline acts in two st…
THROES: a caTalogue of HeRschel Observations of Evolved Stars. I. PACS range spectroscopy
García-Lario, P.; Solano, E.; Sánchez Contreras, C. +3 more
This is the first of a series of papers presenting the THROES (A caTalogue of HeRschel Observations of Evolved Stars) project, intended to provide a comprehensive overview of the spectroscopic results obtained in the far-infrared (55-670 µm) with the Herschel space observatory on low-to-intermediate mass evolved stars in our Galaxy. Here we …
Description, accessibility and usage of SOIR/Venus Express atmospheric profiles of Venus distributed in VESPA (Virtual European Solar and Planetary Access)
Vandaele, A. C.; Thomas, I. R.; Trompet, L. +9 more
Venus Express SOIR profiles of pressure, temperature and number densities of different constituents of the mesosphere and lower thermosphere of Venus are the only experimental data covering the 60 km to 220 km range of altitudes at the terminator of Venus. This unique dataset is now available in the open access VESPA infrastructure. This paper des…
Bayesian hierarchical modelling of initial-final mass relations acrossstar clusters
Si, Shijing; van Dyk, David A.; von Hippel, Ted +3 more
The initial-final mass relation (IFMR) of white dwarfs (WDs) plays an important role in stellar evolution. To derive precise estimates of IFMRs and explore how they may vary among star clusters, we propose a Bayesian hierarchical model that pools photometric data from multiple star clusters. After performing a simulation study to show the benefits…
Broadening of Ly α by neutral helium in DBA white dwarfs
Gänsicke, Boris T.; Toloza, Odette; Koester, Detlev +1 more
Traces of photospheric hydrogen are detected in at least half of all white dwarfs with helium-dominated atmospheres through the presence of H α in high-quality optical spectroscopy. Previous studies have noted significant discrepancies between the hydrogen abundances derived from H α and Ly α for a number of stars where ultraviolet spectroscopy is…
3D modelling of HCO+ and its isotopologues in the low-mass proto-star IRAS16293-2422
Caux, E.; Wakelam, V.; Bottinelli, S. +1 more
Ions and electrons play an important role in various stages of the star formation process. By following the magnetic field of their environment and interacting with neutral species, they slow down the gravitational collapse of the proto-star envelope. This process (known as ambipolar diffusion) depends on the ionization degree, which can be derive…