H. Kučáková
A5005012770- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Planetary Science and Exploration
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Isotope Analysis in Ecology
- High-pressure geophysics and materials
- Cosmology and Gravitation Theories
- History and Developments in Astronomy
- X-ray Spectroscopy and Fluorescence Analysis
- Black Holes and Theoretical Physics
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Relativity and Gravitational Theory
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Superconducting Materials and Applications
Czech Academy of Sciences, Astronomical Institute
2016-2025
Astronomical Institute of the Slovak Academy of Sciences
2019-2025
Charles University
2016-2025
Silesian University in Opava
2012-2025
Centre for Theoretical Physics and Astrophysics
2025
Czech Academy of Sciences, Institute of Physics
2011-2024
Royal Astronomical Society
2016-2020
Slovak Academy of Sciences
2019
VSB - Technical University of Ostrava
2009-2012
Abstract We systematically surveyed period variations of superhumps in SU UMa-type dwarf novae based on newly obtained data and past publications. In many systems, the evolution superhump is found to be composed three distinct stages: an early evolutionary stage with a longer period, middle varying periods, final shorter, stable period. During stage, systems periods less than 0.08 d show positive derivatives. present observational characteristics these stages give greatly improved...
Abstract The physical and orbital parameters of trans-Neptunian objects provide valuable information about the solar system’s formation evolution. In particular, characterization binaries provides insights into mechanisms that may be playing a role at such large distances from Sun. Studies show two distinct populations, (38628) Huya occupies an intermediate position between unequal-sized those with components roughly equal sizes. this work, we predicted observed three stellar occultation...
Abstract On 2022 September 26, the Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, satellite of binary near-Earth asteroid (65803) Didymos. This demonstrated efficacy a kinetic impactor for planetary defense by changing orbital period Dimorphos 33 minutes. Measuring change relied heavily on coordinated campaign lightcurve photometry designed to detect mutual events (occultations and eclipses) as direct probe satellite’s period. A total 28 telescopes contributed 224...
ABSTRACT The Andromeda Galaxy recurrent nova M31N 2008-12a had been observed in eruption 10 times, including yearly eruptions from 2008 to 2014. With a measured recurrence period of <?CDATA ${P}_{\mathrm{rec}}=351\pm 13$?> days (we believe the true value be half this) and white dwarf very close Chandrasekhar limit, has become leading pre-explosion supernova type Ia progenitor candidate. Following multi-wavelength follow-up observations 2013 2014 eruptions, we initiated campaign ensure early...
The recent close approach of the NEA (3200) Phaethon offered a rare opportunity to obtain high-quality observational data. We used newly obtained optical light curves improve spin and shape model determine its surface physical properties derived by thermophysical modeling. also available astrometric observations Phaethon, including those Arecibo radar Gaia spacecraft, constrain secular drift orbital semimajor axis. This constraint allowed us estimate bulk density assuming that is dominated...
The first transiting planetesimal orbiting a white dwarf was recently detected in K2 data of WD1145+017 and has been followed up intensively. multiple, long, variable transits suggest the objects are dust clouds, probably produced by disintegrating asteroid. In addition, system contains circumstellar gas, evident broad absorption lines, mostly u'-band, disc, indicated an infrared excess. Here we present detection change colour during transits, using simultaneous multi-band fast-photometry...
Identifying black holes is essential for our understanding of the development stars and can reveal novel principles physics. Gravitational microlensing provides an exceptional opportunity to examine undetectable population in Milky Way. In particular, long-lasting events are likely be associated with massive lenses, including holes. We present analysis Gaia18ajz event reported by Gaia Science Alerts system. a long-timescale exhibiting features indicative annual parallax effect. Our objective...
The physical and orbital parameters of Trans-Neptunian Objects (TNOs) provide valuable information about the Solar System's formation evolution. In particular, characterization binaries provides insights into mechanisms that may be playing a role at such large distances from Sun. Studies show two distinct populations, (38628) Huya occupies an intermediate position between unequal-size those with components roughly equal sizes. this work, we predicted observed three stellar occultation events...
The discovery rate of near-Earth asteroids (NEAs) has steadily increased over the past three decades, yet physical characterization these objects not kept pace. In an effort to help address this gap, we combined targeted photometric observations, archival data, and sparse data from Asteroid Terrestrial-impact Last Alert System (ATLAS) survey extract as much information possible about NEAs' rotation rates, spin-axis orientations, shapes. We selected 17 NEAs with a potential for shape...
Abstract Contact binaries are found throughout the solar system. The recent discovery of Selam, satellite MBA (152830) Dinkinesh, by NASA LUCY mission has made it clear that term ‘contact binary’ covers a variety different types bi-modal mass distributions and formation mechanisms. Only modelling more contact can this population be properly understood. We determined spin state shape model for Apollo group binary asteroid (388188) 2006 DP14using ground-based optical radar observations...
Abstract Since its discovery in 2008, the Andromeda galaxy nova M31N 2008-12a has been observed eruption every single year. This unprecedented frequency indicates an extreme object, with a massive white dwarf and high accretion rate, which is most promising candidate for single-degenerate progenitor of Type Ia supernova known to date. The previous three eruptions have displayed remarkably homogeneous multiwavelength properties: (i) from faint peak, optical light curve declined rapidly by two...
Abstract The existence of asteroid pairs, two bodies on similar heliocentric orbits, reveals an ongoing process rotational fission among asteroids. This newly found class objects has not been studied in detail yet. Here we choose asteroids (6070) Rheinland and (54827) 2001 NQ8, the most suitable pair for in-depth analysis. First, use available optical photometry to determine their state convex shapes. Rotational pole is very near south ecliptic with a latitude uncertainty about 10°. There...
The Andromeda Galaxy recurrent nova M31N 2008-12a had been caught in eruption eight times. inter-eruption period of is ~1 yr, making it the most rapidly recurring system known, and a strong single-degenerate Type Ia supernova progenitor candidate. Following 2013 eruption, campaign was initiated to detect predicted 2014 then perform high cadence optical photometric spectroscopic monitoring using ground-based telescopes, along with rapid UV X-ray follow-up Swift satellite. Here we report...
Aims: Our goal was to increase number of known doubly eclipsing systems such that the resulting dataset would allow study them via statistical means, as well prove they constitute gravitationally bound 2+2 quadruple system. Methods: We analysed photometric data for binaries provided by OGLE survey in LMC fields. found a large new (our discoveries are 3x more numerous than previous studies). With typical orbital period days binaries, we sought eclipse time variations (ETVs) on timescale...
Influence of cosmological constant on toroidal fluid configurations around charged spherically symmetric black holes and naked singularities is demostrated by study perfect-fluid tori with uniform distribution specific angular momentum orbiting in the Reissner-Nordström-(anti-)de Sitter spacetimes. Toroidal are allowed only spacetimes admitting existence stable circular geodesics. Configurations marginally closed equipotential (equipressure) surfaces crossing itself a cusp allow accretion...
This paper presents 1463 times of minima for 455 objects acquired by 46 members and cooperating observers the Variable Star Exoplanet Section Czech Astronomical Society (B.R.N.O. Observing project). Observations were carried out between October 2013 - September 2014. Some neglected southern eclipsing binaries newly discovered stars project B.R.N.O. are included in list.
<i>Context. <i/>The study of apsidal motion in detached eclipsing binary systems is known to be an important source information about stellar internal structure as well the possibility verifying General Relativity outside Solar System.<i>Aims. <i/>As part long-term Ondřejov and Ostrava observational projects, we aim measure precise times minima for eccentric binaries, needed accurate determination motion, providing a suitable test effects Relativity.<i>Methods. <i/>About seventy new minimum...
Aims. As part of our long-term observational project we aim to measure very precise mid-eclipse times for low-mass eclipsing binaries, which are needed accurately determine their period changes. Over two hundred new minimum light recorded with CCD were obtained three binaries short orbital periods: NSVS 01286630 (), 02502726 and 07453183 ().
The nova M31N 2023-11f (2023yoa) has been recently identified as the second eruption of a previously recognized nova, 2013-10c, establishing latter object 21st recurrent system thus far in M31. Here we present well sampled $R$-band lightcurves both 2013 and 2023 eruptions this system. photometric evolution each was quite similar expected for same progenitor reached peak magnitudes just brighter than $R\sim16$, with fits to declining branches yielding times decline by two $t_2(R)=5.5\pm1.7$...