513 citations · 1.2k across the 19 of their papers we have counts for
19 papers
Capture of exocomets and the erosion of the Oort cloud due to stellar encounters in the Galaxy
Joris Hanse, Lucie Jilkova, Simon F. Portegies Zwart +1
The Oort cloud (OC) probably formed more than 4Gyr ago and has been moving with the Sun in the Galaxy since, exposed to external influences, most prominently to the Galactic ti…
The rate of stellar encounters along a migrating orbit of the Sun
C. A. Martínez-Barbosa, L. Jílková, S. Portegies Zwart +1
The frequency of Galactic stellar encounters the Solar system experienced depends on the local density and velocity dispersion along the orbit of the Sun in the Milky Way galaxy. W…
The Gaia-ESO Survey: Probes of the inner disk abundance gradient
H. R. Jacobson, E. D. Friel, L. Jilkova +41
The nature of the metallicity gradient inside the solar circle (R_GC < 8 kpc) is poorly understood, but studies of Cepheids and a small sample of open clusters suggest that it stee…
Mass transfer between debris discs during close stellar encounters
Lucie Jilkova, Adrian S. Hamers, Michael Hammer +1
We study mass transfers between debris discs during stellar encounters. We carried out numerical simulations of close flybys of two stars, one of which has a disc of planetesimals…
How Sedna and family were captured in a close encounter with a solar sibling
Lucie Jilkova, Simon Portegies Zwart, Tjibaria Pijloo +1
The discovery of 2012VP113 initiated the debate on the origin of the Sedna family of planetesimals in orbit around the Sun. Sednitos roam the outer regions of the Solar System betw…
The fragility of planetary systems
Simon Portegies Zwart, Lucie Jilkova
We specify the range to which perturbations penetrate a planetesimal system. Such perturbations can originate from massive planets or from encounters with other stars. The latter c…
A debris disk under the influence of a wide planetary mass companion: The system of HD106906
Lucie Jilkova, Simon Portegies Zwart
The 13 Myr old star HD106906 is orbited by a debris disk of at least 0.067 M_Moon with an inner and outer radius of 20 AU and 120 AU, respectively, and by a planet at a distance of…
Evidence of tidal distortions and mass loss from the old open cluster NGC 6791
E. Dalessandro, P. Miocchi, G. Carraro +2
We present the first evidence of clear signatures of tidal distortions in the density distribution of the fascinating open cluster NGC 6791. We used deep and wide-field data obtain…
A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA
S. F. Sanchez, F. F. Rosales-Ortega, J. Iglesias-Paramo +35
We present the largest and most homogeneous catalog of HII regions and associations compiled so far. The catalog comprises more than 7000 ionized regions, extracted from 306 galaxi…
Testing MOND gravity in the shell galaxy NGC 3923
Michal Bilek, Bruno Jungwiert, Lucie Jilkova +3
Context. The elliptical galaxy NGC 3923 is surrounded by numerous stellar shells that are concentric arcs centered on the galactic core. They are very likely a result of a minor me…
Space Velocities of Southern Globular Clusters VII. NGC 6397, NGC 6626 (M 28) and NGC 6656 (M 22)
Dana I. Casetti-Dinescu, Terrence M. Girard, Lucie Jilkova +3
We have measured the absolute proper motions of globular clusters NGC 6397, NGC 6626 (M 22) and NGC 6656 (M 28) as part of our ongoing Southern Proper-Motion Program. The reference…
Quadruple-peaked spectral line profiles as a tool to constrain gravitational potential of shell galaxies
Ivana Ebrova, Lucie Jilkova, Bruno Jungwiert +5
Stellar shells observed in many giant elliptical and lenticular as well as a few spiral and dwarf galaxies, presumably result from galaxy mergers. Line-of-sight velocity distributi…
The origin and orbit of the old, metal-rich, open cluster NGC 6791: Insights from kinematics
L. Jilkova, G. Carraro, B. Jungwiert +1
NGC 6791 is a unique stellar system among Galactic open clusters being at the same time one of the oldest open clusters and the most metal rich. Combination of its properties is pu…
A Fossil Bulge Globular Cluster revealed by VLT Multi-Conjugate Adaptive Optics
Sergio Ortolani, Beatriz Barbuy, Yazan Momany +5
The globular cluster HP1 is projected on the bulge, very close to the Galactic center. The Multi-Conjugate Adaptive Optics (MCAO) Demonstrator (MAD) at the Very Large Telescope (VL…
Comparing Various Approaches to Simulating the Formation of Shell Galaxies
Ivana Ebrova, Katerina Bartoskova, Bruno Jungwiert +2
The model of a radial minor merger proposed by Quinn (1984), which successfully reproduces the observed regular shell systems in shell galaxies, is ideal for a test-particle simula…
Quadruple-peaked Line-of-sight Velocity Distributions in Shell Galaxies
Ivana Ebrova, Lucie Jilkova, Bruno Jungwiert +4
We present an improved study of the expected shape of the line-of-sight velocity distribution in shell galaxies. We found a simple analytical expression connecting prominent and in…
Open clusters towards the Galactic center: chemistry and dynamics. A VLT spectroscopic study of NGC6192, NGC6404, NGC6583
Laura Magrini, Sofia Randich, Manuela Zoccali +5
In the framework of the study of the Galactic metallicity gradient and its time evolution, we present new high-resolution spectroscopic observations obtained with FLAMES and the fi…
Shell Galaxies, Dynamical Friction, and Dwarf Disruption
Ivana Ebrova, Bruno Jungwiert, Gabriela Canalizo +2
Using N-body simulations of shell galaxies created in nearly radial minor mergers, we investigate the error of collision dating, resulting from the neglect of dynamical friction an…
Shell Galaxies: Dynamical Friction, Gradual Satellite Decay and Merger Dating
Ivana Ebrova, Bruno Jungwiert, Gabriela Canalizo +2
With the goal to refine modelling of shell galaxies and the use of shells to probe the merger history, we develop a new method for implementing dynamical friction in test-particle…