Search Publications
Quantifying the influence of bars on action-based dynamical modelling of disc galaxies
Green, Gregory M.; Trick, Wilma H.; Ghosh, Soumavo
Action-based dynamical modelling, using stars as dynamical tracers, is an excellent diagnostic to estimate the underlying axisymmetric matter distribution of the Milky Way. However, the Milky Way's bar causes non-axisymmetric resonance features in the stellar disc. Using RoadMapping (an action-based dynamical modelling framework to estimate the gr…
Uncovering new white dwarf–open cluster associations using Gaia DR3
Prišegen, M.; Faltová, N.
Context. Open clusters (OCs) provide homogeneous samples of white dwarfs (WDs) with known distances, extinctions, and total ages. The unprecedented astrometric precision of Gaia allows us to identify many novel OC–WD pairs. Studying WDs in the context of their parent OCs makes it possible to determine the properties of WD progenitors and study the…
Recent progress on magnetic reconnection by in situ measurements
Lu, Quanming; Wang, Rongsheng; Lu, San +2 more
In the last decades, a few spacecraft missions have been launched to investigate the process of magnetic reconnection in space, during which magnetic free energy is explosively released into plasma kinetic energy and heating. Due to the sophisticated in situ measurements of the spacecraft missions, a big progress has been achieved over the last de…
Spectral energy distributions of classical Cepheids in the Magellanic Clouds
Groenewegen, M. A. T.; Lub, J.
In this study, we constructed spectral energy distributions (SEDs) for a sample of 142 Large Magellanic Cloud (LMC) and 77 Small Magellanic Cloud (SMC) fundamental-mode classical Cepheids (CCs) using photometric data from the literature. When possible, the data were taken to be representative of mean light or averaged over the light curve. The sam…
Constraining dark matter substructure with Gaia wide binaries
Buckley, Matthew R.; Ramirez, Edward D.
We use a catalogue of stellar binaries with wide separations (up to 1 pc) identified by the Gaia satellite to constrain the presence of extended substructure within the Milky Way galaxy. Heating of the binaries through repeated encounters with substructure results in a characteristic distribution of binary separations, allowing constraints to be p…
New insight into the massive eccentric binary HD 165052: self-consistent orbital solution, apsidal motion, and fundamental parameters
Rauw, G.; Rosu, S.; Eenens, P. +1 more
HD 165052 is a short-period massive eccentric binary system that undergoes apsidal motion. As the rate of apsidal motion is directly related to the internal structure constants of the binary components, its study allows getting insight into the internal structure of the stars. We use medium- and high-resolution spectroscopic observations of HD 165…
Far beyond the Sun - II. Probing the stellar magnetism of the young Sun ι Horologii from the photosphere to its corona
Sanz-Forcada, J.; Redfield, S.; Drake, J. J. +14 more
A comprehensive multiwavelength campaign has been carried out to probe stellar activity and variability in the young Sun-like star ι-Horologii. We present the results from long-term spectropolarimetric monitoring of the system by using the ultra-stable spectropolarimeter/velocimeter HARPS at the ESO 3.6-m telescope. Additionally, we included high-…
The Z Camelopardalis-type Star AY Piscium: Stellar and Accretion Disk Parameters
Zharikov, Sergey; Merc, Jaroslav; Kára, Jan +5 more
We present a new study of the Z Cam-type eclipsing cataclysmic variable AY Piscium with the aim of determining the fundamental parameters of the system and the structure of the accretion flow therein. We use time-resolved photometric observations supplemented by spectroscopy in the standstill, to which we applied our light-curve modeling technique…
Understanding the Planetary Formation and Evolution in Star Clusters (UPiC). I. Evidence of Hot Giant Exoplanets Formation Timescales
Zhou, Ji-Lin; Dai, Yuan-Zhe; Liu, Hui-Gen +1 more
Planets in young star clusters could shed light on planet formation and evolution since star clusters can provide accurate age estimation. However, the number of transiting planets detected in clusters was only ~30, too small for statistical analysis. Thanks to the unprecedented high-precision astrometric data provided by Gaia DR2 and Gaia DR3, ma…
Full-wave modeling of EMIC wave packets: ducted propagation and reflected waves
Ma, Qianli; Shen, Xiao-Chen; Hanzelka, Miroslav +4 more
Electromagnetic ion cyclotron (EMIC) waves can scatter radiation belt electrons with energies of a few hundred keV and higher. To accurately predict this scattering and the resulting precipitation of these relativistic electrons on short time scales, we need detailed knowledge of the wave field's spatio-temporal evolution, which cannot be obtained…