Search Publications
Spectroscopic diagnostics of dust formation and evolution in classical nova ejecta
Shore, Steven N.; Mason, Elena; De Gennaro Aquino, Ivan +1 more
A fraction of classical novae form dust during the early stages of their outbursts. The classical CO nova V5668 Sgr (Nova Sgr. 2015b) underwent a deep photometric minimum about 100 days after outburst that was covered across the spectrum. A similar event was observed for an earlier CO nova, V705 Cas (Nova Cas 1993) and a less optically significant…
Properties of the inner penumbral boundary and temporal evolution of a decaying sunspot
Gömöry, P.; Jurčák, J.; Kuckein, C. +3 more
Context. It has been empirically determined that the umbra-penumbra boundaries of stable sunspots are characterized by a constant value of the vertical magnetic field.
Aims: We analyzed the evolution of the photospheric magnetic field properties of a decaying sunspot belonging to NOAA 11277 between August 28-September 3, 2011. The observation…
ALMA observations of RCW 120 Fragmentation at 0.01 pc scale&star
Zavagno, A.; Louvet, F.; Bronfman, L. +4 more
Context. Little is known about how high-mass stars form. Around 30% of the young high-mass stars in the Galaxy are observed at the edges of ionized (H II) regions. Therefore these are places of choice to study the earliest stages of high-mass star formation, especially toward the most massive condensations. High spatial resolution observations in …
Planetary Radio Interferometry and Doppler Experiment (PRIDE) technique: A test case of the Mars Express Phobos Flyby. II. Doppler tracking: Formulation of observed and computed values, and noise budget
Bocanegra-Bahamón, T. M.; Molera Calvés, G.; Gurvits, L. I. +5 more
Context. Closed-loop Doppler data obtained by deep space tracking networks, such as the NASA Deep Space Network (DSN) and the ESA tracking station network (Estrack), are routinely used for navigation and science applications. By shadow tracking the spacecraft signal, Earth-based radio telescopes involved in the Planetary Radio Interferometry and D…
Discovery of a jet-like structure with overionized plasma in the SNR IC 443
Greco, Emanuele; Miceli, Marco; Orlando, Salvatore +3 more
Context. IC 443 is a supernova remnant (SNR) located in a quite complex environment since it interacts with nearby clouds. Indications for the presence of overionized plasma have been found though the possible physical causes of overionization are still debated. Moreover, because of its peculiar position and proper motion, it is not clear if the p…
Short arc orbit determination and imminent impactors in the Gaia era
Mignard, F.; Tanga, P.; Carry, B. +6 more
Short-arc orbit determination is crucial when an asteroid is first discovered. In these cases usually the observations are so few that the differential correction procedure may not converge. We developed an initial orbit computation method, based on systematic ranging, which is an orbit determination technique that systematically explores a raster…
Prediction of astrometric microlensing events from Gaia DR2 proper motions
Demleitner, M.; Bastian, U.; Wambsganss, J. +1 more
Context. Astrometric gravitational microlensing is an excellent tool to determine the mass of stellar objects. Using precise astrometric measurements of the lensed position of a background source in combination with accurate predictions of the positions of the lens and the unlensed source it is possible to determine the mass of the lens with an ac…
The low-mass pre-main sequence population of Scorpius OB1
Damiani, Francesco
Context. The low-mass members of OB associations, expected to be a major component of their total population, are in most cases poorly studied because of the difficulty of selecting these faint stars in crowded sky regions. Our knowledge of many OB associations relies on only a relatively small number of massive members.
Aims: We study here t…
X-ray, UV, and optical observations of the accretion disk and boundary layer in the symbiotic star RT Crucis
Nuñez, N. E.; Nelson, T.; Mukai, K. +8 more
Compared to mass transfer in cataclysmic variables, the nature of accretion in symbiotic binaries in which red giants transfer material to white dwarfs (WDs) has been difficult to uncover. The accretion flows in a symbiotic binary are most clearly observable, however, when there is no quasi-steady shell burning on the WD to hide them. RT Cru is th…
Planck's dusty GEMS. V. Molecular wind and clump stability in a strongly lensed star-forming galaxy at z = 2.2
Kneissl, R.; Le Floc'h, E.; Dole, H. +6 more
We report the discovery of a molecular wind signature from a massive intensely star-forming clump of a few 109 M⊙, in the strongly gravitationally lensed submillimeter galaxy "the Emerald" (PLCK_G165.7+49.0) at z = 2.236. The Emerald is amongst the brightest high-redshift galaxies on the submillimeter sky, and was initially d…