A5014040962- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Space Exploration and Technology
- History and Developments in Astronomy
- Nuclear Physics and Applications
- Mechanics and Biomechanics Studies
- Space Satellite Systems and Control
- Adaptive optics and wavefront sensing
- Planetary Science and Exploration
- Relativity and Gravitational Theory
- Calibration and Measurement Techniques
- Historical and Architectural Studies
- Magnetic confinement fusion research
- Atomic and Molecular Physics
Polish Academy of Sciences
2017-2024
Nicolaus Copernicus Astronomical Center
2015-2024
Isaac Newton Group
2017-2018
Jagiellonian University
2013-2017
Traditionally, the effects of interstellar extinction on binary star light curves have been treated as a uniform reduction in observed brightness system that is independent orbital phase. However, unless plane coincides with sky, or if two stars are completely identical and present minimal mutual irradiation tidal/rotational distortions, then this unlikely to be an accurate representation effect extinction. Here, we updated treatment incorporated PHOEBE 2.2 release (publicly available from...
We searched for extrasolar planets around pulsating stars by examining $\textit{Kepler}$ data transit-like events hidden in the intrinsic variability. All Short Cadence observations targets with 6000 K $< T_{\rm eff} <$ 8500 were visually inspected following removal of pulsational signals sinusoidal fits. Clear detected KIC 5613330 and 8197761. is a confirmed exoplanet host (Kepler-635b), where transit period determined here consistent literature value. 8197761 $\gamma$ Doradus - $\delta$...
ABSTRACT We present the first asteroseismic results for δ Scuti and γ Doradus stars observed in Sectors 1 2 of TESS mission. utilize 2-min cadence data a sample 117 to classify their behaviour regarding variability place them Hertzsprung–Russell diagram using Gaia DR2 data. Included within our are eponymous members two pulsator classes, SX Phoenicis. Our pulsating intermediate-mass by also allows us confront theoretical models pulsation driving classical instability strip time show that...
We present the discovery of a 3h5m orbital-period binary star at heart planetary nebula M 3-1 - shortest period photometrically-variable central known and second only to V458 Vul, in general. Combined modelling light radial velocity curves reveals both components be close Roche-lobe-filling, strongly indicating that will rapidly evolve become cataclysmic variable, perhaps experiencing similar evolution Vul resulting nova eruption before has fully dissipated. While short orbital near...
We present a detailed analysis of IC 4776, planetary nebula displaying morphology believed to be typical central star binarity. The is shown comprise compact hourglass-shaped region and pair precessing jet-like structures. Time-resolved spectroscopy its reveals periodic radial velocity variability consistent with binary system. While the data are insufficient accurately determine parameters binary, most likely solutions indicate that secondary probably low-mass main sequence star. An...
Abstract Continuing the project undertaken by Kato et al. (2009), we collected times of superhump maxima for 56 SU UMa-type dwarf novae mainly observed during 2013–2014 season and characterized these objects. We detected negative superhumps in VW Hyi indicated that low number normal outbursts some supercycles can be interpreted as a result disk tilt. This finding, combined with Kepler observation V1504 Cyg V344 Lyr, suggests tilt is responsible modulating outburst pattern novae. also studied...
We present a detailed study of the binary central star planetary nebula ETHOS 1 (PN G068.1+11.0). Simultaneous modelling light and radial velocity curves reveals to comprise hot massive pre-white-dwarf with an M-type main-sequence companion. A good fit observations was found companion that follows expected mass-temperature-radius relationships for low-mass stars, indicating despite being highly irradiated it is consistent not significantly hotter or larger than typical same mass. Previous...
Abstract We present the results of new time-series photometric observations 29 pre–white dwarf stars PG 1159 spectral type, carried out in years 2014–2022. For majority stars, a median noise level Fourier amplitude spectra 0.5–1.0 mmag was achieved. This allowed detection pulsations central star planetary nebula A72 (Abell 72), consistent with g modes excited GW Vir and variability RX J0122.9–7521 that could be due to pulsations, binarity, or rotation. remaining from sample were not observed...
Context. Significant advances have been achieved through the latest improvements in photometric observations accomplished by recent space missions, which substantially boost study of pulsating stars via asteroseismology. The TESS mission has already proven to be particular relevance for white dwarf and pre-white stars. Aims. We report a detailed asteroseismic analysis PG 1159 star NGC 246 (TIC 3905338), is central planetary nebula 246, based on high-precision data gathered mission. Methods....
We present the discovery and characterisation of post-common-envelope central star system in planetary nebula PN G283.7−05.1. Deep images taken as part POPIPlaN survey indicate that may possess a bipolar morphology similar to other nebulae. Simultaneous light radial velocity curve modelling reveals newly discovered binary comprises highly irradiated M -type main-sequence 5.9-hour orbit with hot pre-white dwarf. The nebular progenitor is found have particularly low mass around 0.4 ⊙ , making...
We present a detailed study of the stellar and orbital parameters post-common envelope binary central star planetary nebula Ou~5. Low-resolution spectra obtained during primary eclipse -- to our knowledge first isolated companion post-common-envelope were compared catalogue spectra, indicating that is late K- or early M-type dwarf. Simultaneous modelling multi-band photometry time-resolved radial velocity measurements was then used independently determine both stars as well period...
One-opposition near-Earth asteroids (NEAs) are growing in number, and they must be recovered to prevent loss mismatch risk, improve their orbits, as likely too faint for detection shallow surveys at future apparitions. We aimed recover more than half of the one-opposition NEAs recommended observations by Minor Planet Center (MPC) using Isaac Newton Telescope (INT) soft-override mode some fractions available D-nights. During about 130 hours total between 2013 2016, we targeted 368 NEAs, among...
Context . There are more than 3000 known Galactic planetary nebulae, but only 492 central stars of nebulae (CSPN) have spectral types. It is vital to increase this number in order reliable statistics, which will lead an our understanding these amazing objects. Aims We aim contribute the knowledge and stellar evolution. Methods This observational study based on Gemini Multi-Object Spectrographs (GMOS) with Intermediate Dispersion Spectrograph (IDS) at Isaac Newton Telescope spectra 78 CSPN....
Several studies have shown that a number of stars pulsating in p modes lie between the $\beta$ Cep and $\delta$ Sct instability strips Hertzsprung-Russell (HR) Diagram. At present, there is no certain understanding how p~modes can be excited this $T_{\rm eff}$ range. The goal work to disprove conjecture all lying range are result incorrect measurements eff}$, contamination, or presence unseen cooler companions strip (given high binary fraction region HR Diagram). Using TESS data, we show...
Up to 98% of all single stars will eventually become white dwarfs - that link the history and future evolution Galaxy, whose previous is engraved in their interiors. Those interiors can be studied using asteroseismology, utilizing stellar pulsations as seismic waves. The pulsational instability strips DA DB dwarf are pure, allowing important generalization interior structure represents dwarfs. This not case for hottest pulsating dwarfs, GW Vir stars: only about 50% this domain pulsate....
ABSTRACT The quest for quiet or dormant black holes has been ongoing since several decades. Ellipsoidal variables possibly indicate the existence of a very high-mass invisible companion and are thought to be one best ways find such holes. This, however, is not panacea as we show here with example. We indeed report discovery new semidetached interacting binary, V1315 Cas, discovered an ellipsoidal variable. Using data from photometric surveys (ASAS-SN, TESS) high-resolution spectroscopy,...
We report new observations of the central star planetary nebula VV 47 carried out to verify earlier assertions that short-period pulsation modes detected in are driven by ε-mechanism. In our data, was not variable up a limit 0.52 mmag Fourier amplitude spectrum Nyquist frequency 21.7 mHz. Given this null result we re-analysed data set which oscillations were claimed. After careful reduction, photometry, extinction correction, and analysis with conservative criterion S/N ≥ 4 spectrum, found...
Significant advances have been achieved through the latest improvements in photometric observations accomplished by recent space missions, substantially boosting study of pulsating stars via asteroseismology. The TESS mission has already proven to be relevance for white dwarf and pre-white stars. We report a detailed asteroseismic analysis PG 1159 star NGC 246 (TIC3905338), central planetary nebula 246, based on high-precision data gathered mission. reduced performed using fully evolutionary...
Abstract The study of variable stars in open clusters via asteroseismology is a powerful tool for the stellar evolution and general. That because can be assumed to originate from same interstellar cloud, so they share similar properties such as age overall metallicity. We performed search field young star cluster Roslund 2, with photoelectric CCD photometry acquired at two different telescopes. Within resulting light curves we have found 12 stars. Our measurements confirm three previously...
There are 18 known pulsating subdwarf B stars in the field of view Kepler spacecraft during phase one. The majority them were observed short cadence mode and have been successfully investigated via asteroseismic methods. Since these important for stellar evolution theory, we performed a search blue vicinity open cluster NGC 6791, which was by long so-called super apertures. We used Q1-Q17 LC data pixel analysis using PyKE our customized scripts. preliminary tagged 23 objects calculated...
The quest for quiet or dormant black holes has been ongoing since several decades. Ellipsoidal variables possibly indicate the existence of a very high-mass invisible companion and are thought to be one best ways find such holes. This, however, is not panacea as we show here with example. We indeed report discovery new semi-detached interacting binary, V1315 Cas, discovered an ellipsoidal variable. Using data from photometric surveys (ASAS-SN, TESS) high-resolution spectroscopy, derived...
We present the results of new time series photometric observations 29 pre-white dwarf stars PG 1159 spectral type, carried out in years 2014-2022. For majority stars, a median noise level Fourier amplitude spectra 0.5-1.0 mmag was achieved. This allowed detection pulsations central star planetary nebula Abell 72, consistent with g-modes excited GW Vir and variability RX J0122.9-7521 that could be due to pulsations, binarity or rotation. remaining from sample were not observed vary, we placed...