Search Publications
The X-ray dust-scattered rings of the black hole low-mass binary V404 Cyg
Vasilopoulos, G.; Petropoulou, M.
We report on the first detection of X-ray dust-scattered rings from the Galactic low-mass X-ray binary V404 Cyg. The observation of the system with Swift/XRT on 2015 June 30 revealed the presence of five concentric ring-like structures centred at the position of V404 Cyg. Follow-up Swift/XRT observations allowed a time-dependent study of the X-ray…
ν generation: Present and future constraints on neutrino masses from global analysis of cosmology and laboratory experiments
Melchiorri, Alessandro; Gerbino, Martina; Lattanzi, Massimiliano
We perform a joint analysis of current data from cosmology and laboratory experiments to constrain the neutrino mass parameters in the framework of Bayesian statistics, also accounting for uncertainties in nuclear modeling, relevant for neutrinoless double β decay (0 ν 2 β ) searches. We find that a combination of current oscillation, cosmological…
The SOPHIE search for northern extrasolar planets. VIII. Follow-up of ELODIE candidates: long-period brown-dwarf companions
Bouchy, F.; Moutou, C.; Queloz, D. +29 more
Long-period brown dwarf companions detected in radial velocity surveys are important targets for direct imaging and astrometry to calibrate the mass-luminosity relation of substellar objects. Through a 20-yr radial velocity monitoring of solar-type stars that began with ELODIE and was extended with SOPHIE spectrographs, giant exoplanets and brown …
The extinction and dust-to-gas structure of the planetary nebula NGC 7009 observed with MUSE
Walsh, J. R.; Barlow, M. J.; Monreal-Ibero, A. +3 more
Context. Dust plays a significant role in planetary nebulae. Dust ejected with the gas in the asymptotic giant branch (AGB) phase is subject to the harsh environment of the planetary nebula (PN) while the star is evolving towards a white dwarf. Dust surviving the PN phase contributes to the dust content of the interstellar medium.
Aims: The m…
Concurrent Formation of Carbon and Silicate Dust in Nova V1280 Sco
Onaka, Takashi; Usui, Fumihiko; Koo, Bon-Chul +12 more
We present infrared multi-epoch observations of the dust-forming nova V1280 Sco over ∼2000 days from the outburst. The temporal evolution of the infrared spectral energy distributions at 1272, 1616, and 1947 days can be explained by the emissions produced by amorphous carbon dust of mass (6.6-8.7) × 10-8 M⊙ with a representat…
Geomorphological mapping of comet 67P/Churyumov-Gerasimenko's Southern hemisphere
Bertaux, Jean-Loup; Da Deppo, Vania; Naletto, Giampiero +49 more
In 2015 May, the Southern hemisphere of comet 67P/Churyumov-Gerasimenko became visible by the OSIRIS cameras on-board the Rosetta spacecraft. The resolution was high enough to carry out a detailed analysis of the surface morphology, which is quite different from the Northern hemisphere. Previous works show that fine particle deposits are the most …
The perihelion activity of comet 67P/Churyumov-Gerasimenko as seen by robotic telescopes
Meech, Karen J.; Snodgrass, Colin; Lister, Tim +13 more
Around the time of its perihelion passage, the observability of 67P/Churyumov-Gerasimenko from Earth was limited to very short windows each morning from any given site, due to the low solar elongation of the comet. The peak in the comet's activity was therefore difficult to observe with conventionally scheduled telescopes, but was possible where s…
The tectonics of Titan: Global structural mapping from Cassini RADAR
Kirk, Randolph L.; Lorenz, Ralph D.; Neish, Catherine D. +5 more
The Cassini RADAR mapper has imaged elevated mountain ridge belts on Titan with a linear-to-arcuate morphology indicative of a tectonic origin. Systematic geomorphologic mapping of the ridges in Synthetic Aperture RADAR (SAR) images reveals that the orientation of ridges is globally E-W and the ridges are more common near the equator than the pole…
The Molecular Clouds Fueling A 1/5 Solar Metallicity Starburst
Leroy, Adam K.; Johnson, Kelsey E.; Sandstrom, Karin +2 more
Using the Atacama Large Millimeter/submillimeter Array, we have made the first high spatial and spectral resolution observations of the molecular gas and dust in the prototypical blue compact dwarf galaxy II Zw 40. The {}12{CO}(2-1) and {}12{CO}(3-2) emission is clumpy and distributed throughout the central star-forming regio…
An HST/COS legacy survey of intervening Si III absorption in the extended gaseous halos of low-redshift galaxies
Wakker, B. P.; Fechner, C.; Richter, P. +3 more
Aims: Doubly ionized silicon (Si III) is a powerful tracer of diffuse ionized gas inside and outside of galaxies. It can be observed in the local Universe in ultraviolet (UV) absorption against bright extragalactic background sources. We here present an extensive study of intervening Si III-selected absorbers and study the properties of the w…