P. Bartczak
A5054777885- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Geomagnetism and Paleomagnetism Studies
- Geology and Paleoclimatology Research
- Gamma-ray bursts and supernovae
- Isotope Analysis in Ecology
- Scientific Research and Discoveries
- Geological and Geochemical Analysis
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- Galaxies: Formation, Evolution, Phenomena
- High-pressure geophysics and materials
- Calibration and Measurement Techniques
- Distributed and Parallel Computing Systems
- Space Exploration and Technology
- Scientific Computing and Data Management
- Pulsars and Gravitational Waves Research
- Magnetic confinement fusion research
- Astronomical and nuclear sciences
- CCD and CMOS Imaging Sensors
Astronomical Observatory
2013-2025
Adam Mickiewicz University in Poznań
2015-2024
University of Alicante
2022-2024
University of Liège
2006-2008
Context. Until recently, the 3D shape, and therefore density (when combining volume estimate with available mass estimates), surface topography of vast majority largest ( D ≥ 100 km) main-belt asteroids have remained poorly constrained. The improved capabilities SPHERE/ZIMPOL instrument opened new doors into ground-based asteroid exploration. Aims. To constrain formation evolution a representative sample large asteroids, we conducted high-angular-resolution imaging survey 42...
Asteroid (16) Psyche is the target of NASA mission. It considered one few main-belt bodies that could be an exposed proto-planetary metallic core and would thus related to iron meteorites. Such association however challenged by both its near- mid-infrared spectral properties reported estimates density. Here, we aim refine density set further constraints on bulk composition determine potential meteoritic analog. We observed with ESO VLT/SPHERE/ZIMPOL as part our large program (ID 199.C-0074)....
We report the detection of radio afterglow a long gamma-ray burst (GRB) 111005A at 5-345 GHz, including very baseline interferometry observations with positional error 0.2 mas. The position is coincident disk galaxy ESO 580-49 z= 0.01326 (~1" from its center), which makes GRB second closest known to date, after 980425. was an order magnitude less luminous than those local low-luminosity GRBs, and obviously cosmological GRBs. flux approximately constant then experienced unusually rapid decay...
<title>Abstract</title> Understanding the physical characteristics of small bodies in Solar System is crucial for refining models their formation and evolution. Although several kilometre-sized asteroids have already been visited by spacecraft, 1998 KY26 will be first asteroid decametre range to explored situ. Its diameter spin period place it above barrier, suggesting that its properties may differ from those previously bodies. However, key remain poorly understood. We conducted a...
Context. The vast majority of the geophysical and geological constraints (e.g., internal structure, cratering history) for main-belt asteroids have so far been obtained via dedicated interplanetary missions ESA Rosetta, NASA Dawn). high angular resolution SPHERE/ZIMPOL, new-generation visible adaptive-optics camera at ESO VLT, implies that these science objectives can now be investigated from ground a large fraction D ≥ 100 km asteroids. sharp images acquired by this instrument used to...
Context. Over the past decades, several interplanetary missions have studied small bodies in situ, leading to major advances our understanding of their geological and geophysical properties. These missions, however, had a limited number targets. Among them, NASA Dawn mission has characterised detail topography albedo variegation across surface asteroid (4) Vesta down spatial resolution ~20 m pixel −1 scale. Aims. Here aim was determine how much topographic information can be retrieved from...
Context. Asteroid (16) Psyche is the largest M-type asteroid in main belt and target of NASA mission. It also only this size ( D > 200 km) known to be metal rich. Although various hypotheses have been proposed explain rather unique physical properties asteroid, a perfect understanding its formation bulk composition still missing. Aims. We aim refine shape density perform thorough analysis better constrain possible scenarios structure interior. Methods. obtained disk-resolved...
Context. The recent estimates of the 3D shape M/Xe-type triple asteroid system (216) Kleopatra indicated a density 5 g.cm$^{-3}$. Such high implies metal content and low porosity which is not easy to reconcile with its peculiar dumbbell shape. Aims. Given unprecedented angular resolution VLT/SPHERE/ZIMPOL camera, we aim constrain mass accuracy, hence density. Methods. We combined our new VLT/SPHERE observations recorded in 2017 2018 archival data, as well lightcurve, occultation,...
Context. The available set of spin and shape modelled asteroids is strongly biased against slowly rotating targets those with low lightcurve amplitudes. This due to the observing selection effects. As a consequence, current picture asteroid axis distribution, rotation rates, radiometric properties, or aspects related object’s internal structure might be affected too. Aims. To counteract these effects, we are running photometric campaign large sample main belt omitted in most previous...
Context. CM-like asteroids (Ch and Cgh classes) are a major population within the broader C-complex, encompassing about 10% of mass main asteroid belt. Their internal structure has been predicted to be homogeneous, based on their compositional similarity as inferred from spectroscopy (Vernazza et al., 2016, AJ 152, 154) numerical modeling early thermal evolution (Bland & Travis, 2017, Sci. Adv. 3, e1602514). Aims. Here we aim test this hypothesis by deriving density (41) Daphne detailed its...
Dynamical models of Solar System evolution have suggested that P-/D-type volatile-rich asteroids formed in the outer and may be genetically related to Jupiter Trojans, comets small KBOs. Indeed, their spectral properties resemble anhydrous cometary dust. High-angular-resolution images P-type asteroid (87) Sylvia with VLT/SPHERE were used reconstruct its 3D shape, study dynamics two satellites. We also model Sylvia's thermal evolution. The shape appears flattened elongated. derive a...
<i>Context. <i/>The asteroid 25143 Itokawa is one of the candidates for detection Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect in rotation period. Previous studies were carried out up to facets triangulation model and not able provide a good theoretical estimate this effect, raising questions about influence mesh resolution centre mass location on evolution period.<i>Aims. YORP computed different topography models highest Gaskell triangular faces an attempt find best possible...
We investigated the reliability of genetic algorithm which will be used to invert photometric measurements asteroids collected by European Space Agency Gaia mission. To do that, we performed several sets simulations for 10 000 having different spin axis orientations, rotational periods and shapes. The observational epochs each simulation were extracted from mission simulator developed at Observatoire de la Côte d'Azur, while brightness was generated using a Z-buffer standard graphic method....
Asteroid (31) Euphrosyne is one of the biggest objects in asteroid main belt and family occupies a highly inclined region outer contains remarkably large number members, which interpreted as an outcome disruptive cratering event. The goals this adaptive-optics imaging study were threefold: to characterize shape Euphrosyne, constrain its density, search for craters that may be associated with formation We obtained disk-resolved images using SPHERE/ZIMPOL at ESO's 8.2-m VLT part our program...
Abstract Understanding how galaxies quench their star formation is crucial for studies of galaxy evolution. Quenching related to a decrease cold gas. In the first paper we showed that dust removal timescale in early-type (ETGs) about 2.5 Gyr. Here present carbon monoxide and 21 cm hydrogen line observations these measure interstellar medium (ISM). We find all ISM components (dust molecular atomic gas) decline at similar rates. This allows us rule out wide range potential ISM-removal...
Context . Asteroids with companions constitute an excellent sample for studying the collisional and dynamical evolution of minor planets. The currently known binary population were discovered by different complementary techniques that produce, moment, a strongly biased distribution, especially in range intermediate asteroid sizes (≈2–100 km) where both mutual photometric events high-resolution adaptive optic imaging are poorly efficient. Aims A totally independent technique discovery, based...
A Lie-Poisson integrator with Wisdom-Holman type splitting is constructed for the problem of a rigid body and sphere (the Kinoshita problem). The algorithm propagates not only position, momentum angular vector system, but also tangent "infinitesimal displacements". latter allow to evaluate maximum Lyapunov exponent or MEGNO indicator Cincotta Simó. Three exemplary cases are studied: motion Hyperion, fictitious binary asteroid Hyperion as one components, 90 Antiope. In all attitude...
Context. The shapes and spin states of asteroids observed with photometric techniques can be reconstructed using the lightcurve inversion method. resultant models then confirmed or exploited further by other techniques, such as adaptive optics, radar, thermal infrared, stellar occultations, space probe imaging.
The near-Earth asteroid 3200 Phaethon (1983 TB) is an attractive object not only from a scientific viewpoint but also because of JAXA's DESTINY+ target. rotational lightcurve and spin properties were investigated based on the data obtained in ground-based observation campaign Phaethon. We aim to refine lightcurves shape model using all available datasets via optical observation, as well our time-series 2017 apparition. Using eight 1-2-m telescopes imager, we acquired derived parameters...
An important aspect of quenching star formation is the removal cold interstellar medium (ISM; non-ionised gas and dust) from a galaxy. In addition, dust grains can be destroyed in hot or turbulent medium. The adopted timescale usually relies on uncertain theoretical estimates. It tricky to track removal, because constantly replenished by consecutive generations stars. Our objective measure observationally removal. We here explore an approach select galaxies which do have detectable amounts...