Search Publications
Stagnant Shells in the Vicinity of the Dusty Wolf-Rayet-OB Binary WR 112
Moffat, A. F. J.; Schödel, R.; Ressler, M. E. +3 more
We present high spatial resolution mid-infrared images of the nebula around the late-type carbon-rich Wolf-Rayet (WC)-OB binary system WR 112 taken by the recently upgraded VLT spectrometer and imager for the mid-infrared (VISIR) with the PAH1, Ne ii_2, and Q3 filters. The observations reveal a morphology resembling a series of arc-like filaments …
XMM-Newton observation of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.326
Ghisellini, G.; Fan, Xiaohui; Fabian, A. C. +7 more
A brief Chandra observation of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.326 showed it to be a relatively bright, soft X-ray source with a count rate of about 1 count ks-1. In this article, we present results for the quasar from a 65-ks XMM-Newton observation, which constrains its spectral shape well. The quasar is…
Tangential deflection and formation of counterstreaming flows at the impact of a plasma jet on a tangential discontinuity
Echim, M.; Voitcu, G.
In this letter we report three-dimensional particle-in-cell simulations of the interaction between a nonpenetrable magnetosheath jet and the magnetopause, for northward interplanetary magnetic field. The magnetopause is modeled as a tangential discontinuity with no magnetic shear. We investigate the deflection of the plasma jet in the direction ta…
Roche tomography of cataclysmic variables - VIII. The irradiated and spotted dwarf nova, SS Cygni
Szkody, P.; Hebb, L.; Hill, C. A. +1 more
We present the results of our spectroscopic study of the dwarf nova SS Cyg, using Roche tomography to map the stellar surface and derive the system parameters. Given that this technique takes into account the inhomogeneous brightness distribution on the surface of the secondary star, our derived parameters are (in principle) the most robust yet fo…
Transit-timing variations in the system Kepler-410Ab
Gajdoš, Pavol; Vaňko, Martin; Parimucha, Štefan +1 more
We present a new analysis of the transit timing variations displayed by the extrasolar planet Kepler-410Ab. We obtained and improved the orbital and physical parameters for the planet and analysed 70 transit times obtained by the Kepler satellite. In our analysis of the O-C diagram (observed minus calculated), we assumed that the observed changes …
Connecting HL Tau to the observed exoplanet sample
Tamayo, Daniel; Murray, Norman; Petrovich, Cristobal +2 more
The Atacama Large Millimeter/submilimeter Array (ALMA) recently revealed a set of nearly concentric gaps in the protoplanetary disc surrounding the young star HL Tauri (HL Tau). If these are carved by forming gas giants, this provides the first set of orbital initial conditions for planets as they emerge from their birth discs. Using N-body integr…
Scenarios for the dynamics of comet 67P/Churyumov-Gerasimenko over the past 500 kyr
Guzzo, Massimiliano; Lega, Elena
The complex dynamics of 67P has the typical uncertainties of the Jupiter-family comets. The Rosetta mission provided a unique opportunity to dissipate them with fresh experimental data. We aim to constrain the residence time of the comet in a dynamics dominated by Jupiter and Saturn by comparing statistics of large sets of numerical integrations w…
The cooling, mass and radius of the neutron star in EXO 0748-676 in quiescence with XMM-Newton
Costantini, Elisa; Méndez, Mariano; Cheng, Zheng +1 more
We analyse four XMM-Newton observations of the neutron-star low-mass X-ray binary EXO 0748-676 in quiescence. We fit the spectra with an absorbed neutron-star atmosphere model, without the need for a high-energy (power-law) component; with a 95 per cent confidence the power law contributes less than 1 per cent to the total flux of the source in 0.…
Mapping diffuse interstellar bands in the local ISM on small scales via MUSE 3D spectroscopy. A pilot study based on globular cluster NGC 6397
Richter, Philipp; Brinchmann, Jarle; Weilbacher, Peter M. +6 more
Context. We map the interstellar medium (ISM) including the diffuse interstellar bands (DIBs) in absorption toward the globular cluster NGC 6397 using VLT/MUSE. Assuming the absorbers are located at the rim of the Local Bubble we trace structures on the order of mpc (milliparsec, a few thousand AU).
Aims: We aimed to demonstrate the feasibili…
Adaptive PSF fitting - a highly performing photometric method and light curves of the GLS H1413+117: time delays and micro-lensing effects
Surdej, J.; Nuritdinov, S. N.; Elyiv, A. +12 more
We present new photometric observations of H1413+117 acquired during seasons between 2001 and 2008 in order to estimate the time delays between the lensed quasar images and to characterize at best the on-going micro-lensing events. We propose a highly performing photometric method called the adaptive point spread function fitting and have successf…