A5031274825- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Computational Physics and Python Applications
- History and Developments in Astronomy
- Modeling and Simulation Systems
- Spacecraft and Cryogenic Technologies
- Scientific Research and Discoveries
- Mathematics, Computing, and Information Processing
- Distributed and Parallel Computing Systems
- Simulation Techniques and Applications
- Astrophysical Phenomena and Observations
- Scientific Computing and Data Management
University of Pavol Jozef Šafárik
2017-2024
Institute of Physics of the Slovak Academy of Sciences
2017-2024
Czech Academy of Sciences, Astronomical Institute
2024
Czech Academy of Sciences, Institute of Physics
2017
Abstract The ExoClock project has been created to increase the efficiency of Ariel mission. It will achieve this by continuously monitoring and updating ephemerides candidates, in order produce a consistent catalog reliable precise ephemerides. This work presents homogenous updated for 450 planets, generated integration ∼18,000 data points from multiple sources. These sources include observations ground-based telescopes (the network Exoplanet Transit Database), midtime values literature,...
We present a new analysis of the transit timing variations displayed by extrasolar planet Kepler-410Ab. obtained and improved orbital physical parameters for analysed 70 times Kepler satellite. In our O-C diagram (Observed-Calculated), we assumed that observed changes in are probably caused gravitational influence another body system. To determine mass perturbing body, have considered light-time effect an analytical approximation perturbation model. The solutions resulting from both methods...
We present and analyze 58 transit light curves of TrES-3b 98 Qatar-1b observed by Transiting Exoplanet Survey Satellite (TESS), plus two us using a ground-based 1.23\,m telescope. These are combined with the best-quality taken from Transit Database (ETD) literature. The precisely determined mid-transit times these enable to obtain refined orbital ephemerides improved precision for both hot Jupiters. From timing analysis, we find an indication presence variations (TTVs) in systems. Since TTVs...
We determine new linear ephemerides of transiting exoplanets using long-cadence de-trended data from quarters Q1 to Q17 the Kepler mission. analysed transit-timing variation (TTV) diagrams 2098 extrasolar planets. The TTVs 121 objects were excluded (because insufficient datapoints, influence stellar activity, etc.). Finally, 1977 archive are presented. A significant trend was observed on TTV approximately 35% studied. Knowing correct ephemeris is key for successful follow-up observations...
We studied three exoplanetary systems with transiting planets: WASP-92, WASP-93 and WASP-118. Using ground-based photometric observations of WASP-92 Kepler-K2 WASP-118, we redetermined the orbital physical parameters these planets. The precise times all transits were determined. constructed O-C diagrams analysed possible transit timing variations. did not observe any significant deviation from a linear ephemeris for selected exoplanets. put upper-mass limits other hypothetical planets in...
Here we present an initial look at the dynamics and stability of 178 multiplanetary systems which are already confirmed listed in NASA Exoplanet Archive. To distinguish between chaotic regular nature a system, value MEGNO indicator for each system was determined. Almost three-quarters them could be labelled as long-term stable. Only 45 studied show behaviour. We consequently investigated effects number planets their parameters on stability. A comparison results obtained using...
Eclipsing binary KIC 7023917 is one of nearly three thousand other binaries in the well-known Kepler Binary Catalog.However, it has some uncommon features.We focused on this system because we detected fast anti-correlated changes O-C diagram which could suggest presence apsidal motion.However, these are very for motion and orbit circular.Detailed analysis TESS light curves reveals deformation curve by short-periodic pulsations O'Connell effect caused stellar spot(s).Here, present our initial...
We present a deep-learning model for the classification of eclipsing binaries.Our classifier provides tool categorization light curves binaries into four classes: detached systems with and without spots, over-contact spots.The was trained on 200 000 synthetic created using ELISa code.We randomly selected 100 from GAIA catalogue, which were fitted evaluation purposes, their morphologies determined.We tested several classifiers found that best-performing combined Long Short-Term Memory (LSTM)...
Times of minima eclipsing binary KIC 7023917 show quasiperiodic anti-symmetric deviations from the calculated one with an amplitude up to 10 minutes and a period 200 - 300 days. These changes correlate observed variations light-curve maxima (amplitude phase separation). We used photometric data obtained by Kepler TESS missions analyse times determine system parameters. The phases amplitudes were measured study O'Connell effect. As additional source information, we performed ground-based...
Transit timing variations of Kepler-410Ab were already reported in a few papers. Their semi-amplitude is about 14.5 minutes. In our previous paper, we found that the transit could be caused by presence stellar companion this system. Our main motivation for paper was to investigate variation radial-velocity curve generated additional star We performed spectroscopic observation Kepler-410 using three telescopes Slovakia and Czech Republic. Using cross-correlation function, measured radial...
We present the photometric analysis of BVR and TESS light curves three eclipsing binaries, together with their period changes considering archival data new minima times from our observations. For first time we detected wave-like variations low-amplitude in O − C residua RU UMi, which can be interpreted as a consequence light-time effect caused by 3rd component 7370 days. The increase VY UMi system corresponds to mass transfer secondary primary component. GSC 04364-00648 binary find quadratic...
Abstract KIC 4851217 is a short period eclipsing binary ( P = 2.47 days) in the field of Kepler K1 mission. As well as variability caused by eclipses, low-amplitude pulsations are also present data. A frequency analysis residual light-curve revealed δ Sct range from 15–21 d −1 with amplitudes up to 3.5 mmag. Strong linear coupling f i p + kf orb ) orbital was found, indicating tidally locked modes. From an 5 selected groups frequencies we identified radial mode on secondary component, 3...
We present new analyses of variations in O – C diagrams three Algol-type eclipsing binary stars: AD And, TW Cas and IV Cas. have used all published minima times (including visual photographic) as well newly determined ones from our SuperWasp observations. orbital parameters 3rd bodies the systems with statistically significant errors, using code based on genetic algorithms Markov chain Monte Carlo simulations. confirmed multiple nature And triple-star model Cas, we proposed a quadruple-star
Abstract There is a small group of peculiar early-type stars on the main sequence that show different rotation velocities from spectral lines. This inconsistency might be due to binary nature these objects. We aim verify this hypothesis by more detailed spectroscopic and photometric investigation one such object: HD 183986. obtained 151 high- medium-resolution spectra covered an anticipated long orbital period. clear evidence motion primary component. uncovered very faint broad spectrum...
We revise parameters of four transiting hot Jupiter planets discovered by ground-based surveys.We use follow-up observations carried TESS mission together with PyTransit software.Space telescopes like provide better coverage and photometry precision than telescopes.PyTransit is fast user-friendly exoplanet transit light curve modelling package, implementing optimised versions the Gimenéz Mandel & Agol models.After applying to data, our results show an improvement in exoplanets estimation.
We present the photometric analysis of \textit{BVR} and \textit{TESS} light curves three eclipsing binaries (RU~UMi purely studied VY~UMi, GSC 04364-00648), together with their period changes considering archival data new minima times from our observations. For first time we detected wave-like variations low-amplitude in $O-C$ residua RU UMi, which can be interpreted as a consequence light-time effect caused by 3rd invisible component 7370 days. Period increase rate...
Software OCFit is designed for fitting O-C diagrams of eclipsing binaries and transiting exoplanets by standard analytical models (e.g. light-time effect or apsidal motion). The program written in the modern language Python. A very intuitive graphic user interface also a part this software. Moreover, could be used as Python package your own code. Its development started 2015. GUI was published three years later. Here, we present changes newly implemented features software since its...
Abstract Our poster presented a new analysis of the transit-time variations displayed by extrasolar planet Kepler-410Ab. We assumed that observed changes in transit times are caused gravitational influence another body system. To determine mass perturbing body, we considered light-time effect and an analytical approximation perturbation model. The solutions resulting from both methods gave comparable results, with orbital period 970 days slightly eccentric orbit for third body. proposed two...