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Boróka Hanga Pál (Szegedi Tudományegyetem)04/11/2026, 10:30
Massive stars can undergo substantial mass loss through several mechanisms, including nuclear flashes, pulsational pair instability (PPI), and convection waves depositing energy in the stellar envelope. Such mass-loss episodes are expected to create dense circumstellar environments that significantly affect the light curves of subsequent supernova explosions through ejecta–circumstellar...
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Dorottya Elekes (Eötvös University/Konkoly Observatory)04/11/2026, 10:45
We conducted photometric observations in multiple color bands (B , V, R) on selected target stars suspected of flare activity. The measurements were carried out using the 1 m RCC telescope of Konkoly Observatory. By comparing the light curves obtained through differential photometry in the three bands, we estimated the temperatures of the flares observed. Such temperature estimates derived...
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Zsófia Vig04/11/2026, 11:30
Supernova (SN) explosions are fundamental phenomena representing the final stages of stellar evolution, during which an enormous amount of energy is released over a short period of time. The radiation emitted during the explosion can interact with the circumstellar material (CSM), which can significantly affect the observed light curves (LCs) and spectra.
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A classic example of this... -
Zsuzsanna Dálya04/11/2026, 11:45
Stellar activity cycles are generally studied using observations spanning a decade or more. However, shorter time series may be sufficient to investigate activity-related variations in rapidly rotating F-type stars. The relationship between stellar rotation period and activity-cycle length is well established, but F-type stars occupy an intermediate position between the active and inactive...
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Marcell L. Kovács (HUN-REN CSFK Konkoly Observatory, Eötvös University Institute of Physics)04/11/2026, 12:00
The Transiting Exoplanet Survey Satellite (TESS) has accumulated an extensive photometric dataset for pulsating stars across the sky. Its scientific value for long-period pulsators depends strongly on the available time baseline. A single 27-day sector often covers only a fraction of a pulsation cycle, whereas stars in overlapping sectors may be monitored for several months, with coverage...
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Dániel Estók (ELTE, HUN-REN CSFK CSI)04/11/2026, 12:15
Young stellar objects (YSOs) show variability on very different time scales and with different amplitudes due to several physical mechanisms including changes in the mass accretion rate. Eruptive YSOs show variability on longer time scales (from several months to a year or from decades to a century) and with amplitudes up to 6 magnitudes. Studying these examples of episodic accretion is...
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Anna Császár (ELTE, HUN-REN CSFK CSI)04/11/2026, 14:00
The observed lifetimes of protoplanetary disks are well established, but the mechanisms responsible for their dispersal are still under investigation. In the classical α-viscous model angular momentum transport is assumed to be driven by the magnetorotational instability (MRI), which requires sufficient ionization. The ionization structure of a disk is spatially non-uniform: highly ionized...
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Botond Máté Marosi (Eötvös Loránd University)04/11/2026, 14:15
Protoplanetary discs are the birthplaces of planets and small bodies, where small dust grains grow into larger particles during the early stages of planet formation. Observations at millimeter and submillimeter wavelengths can trace this dust, study its distribution within the disc, and investigate the conditions under which dust grows. The Atacama Large Millimeter/submillimeter Array (ALMA)...
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János Pető (HUN-REN Research Centre For Astronomy and Earth Sciences)04/11/2026, 14:30
Studies of chondritic meteorites originating from the Solar System have revealed that chondrules - small, spherical silicate inclusions - can be formed by intense, rapid heating followed by rapid cooling. A viable explanation for their formation is that in the primordial stages of the protoplanetary disk electrical discharges or lightning can occur and cause melting of the different size dust...
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András Németh (Eötvös Loránd University)04/11/2026, 14:45
The migration of low-mass planets is governed by the interplay between gravitational torques from the gaseous and solid components of the protoplanetary disc. Performing 2D global hydrodynamic simulations in locally isothermal discs, we investigate the often-neglected back-reaction of solid material on gas dynamics across varying metallicities, Stokes numbers, and accretion efficiencies. Our...
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111. Time-Domain Complementary Science with Ariel: Young Stellar Objects, Debris Discs and ExocometsNóra Takács (HUN-REN CSFK Konkoly Observatory)04/11/2026, 15:00
Young stellar objects (YSOs) exhibit variability over a wide range of timescales and amplitudes, driven by stellar activity, variable extinction and disc accretion. Disentangling these processes remains challenging, yet their variability provides key insights into stellar mass assembly and the evolution of young planetary systems. The broad wavelength coverage and spectroscopic capabilities of...
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Adrija Bhowmick (HUN-REN Atomki, Debrecen, Hungary)04/11/2026, 15:15
The development of sustainable lunar infrastructure requires construction materials that can withstand extreme temperature variations and persistent radiation exposure while reducing dependence on Earth-supplied resources. Materials intended for in situ resource utilisation (ISRU), including polymers, metallic composites, aerogels and lunar regolith analogues, must be evaluated under relevant...
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Duncan Mifsud (HUN-REN Atommagkutató Intézet)05/11/2026, 09:00
The cycling of sulphur on the surfaces of Jupiter’s Galilean moons (i.e., Io, Europa, Ganymede, and Callisto) is a key process that may be directly linked to the putative habitability of these moons. This process is largely driven by ionising radiation from Jupiter’s sulphur-rich magnetosphere. Despite the astrochemical and astrobiological importance of sulphur cycling and chemistry on the...
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Rodrigo Zamudio Ramírez (University of Debrecen / HUN-REN ATOMKI)05/11/2026, 09:15
Ices are observed across the universe, including on planetary bodies, comets, within the interstellar medium (ISM), and in protoplanetary disks [1]. In these environments are subjected to a flux of UV irradiation, electron bombardment, cosmic rays bombardment, solar wind and thermal chemistry, which drive structural modifications, induce the desorption of molecules and radicals from the...
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Sándor Kovács (HUN-REN ATOMKI)05/11/2026, 09:30
Nucleosynthesis above the iron region mainly proceeds via successive neutron capture processes, such as the s- and r-processes. However, in the case of neutrino-driven ejecta from a core-collapse supernova, nucleosynthesis runs relatively close to the valley of stability, hence it proceeds mainly via (α,n) and (p,n) reactions towards higher mass numbers [1]. Sensitivity studies have shown that...
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Riccardo Biasissi (Università degli Studi di Padova, ATOMKI)05/11/2026, 09:45
The energy production, chemical evolution and elemental abundances of stars are governed by thermonuclear reactions occurring at energies far below the Coulomb barrier. Measuring their cross sections is the central challenge of experimental nuclear astrophysics: at stellar energies the Coulomb repulsion suppresses the cross sections by many orders of magnitude, down to the picobarn-femtobarn...
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Gábor Bihari (HUN-REN ATOMKI)05/11/2026, 10:00
The CNO cycle plays a paramount role in the evolution of massive stars. Above 1.3 solar masses, the CNO cycle becomes the dominant energy-generation mechanism, overtaking the role of the proton-proton chain. In the CNO cycle, carbon and nitrogen isotopes act as catalysts, helping the fusion of hydrogen into helium.
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The reaction rate of the entire cycle is governed by its slowest reaction, the... -
Zsolt Mátyus (HUN-REN INSTITUTE FOR NUCLEAR RESEARCH)05/11/2026, 10:15
Classical nova explosions contribute to the chemical enrichment of the inter-
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stellar medium and are potential sources of presolar grains found in primitive
meteorites. The silicon isotopic ratios 29Si/28Si and 30Si/28Si provide im-
portant signatures for identifying the stellar origin of these grains [1, 2].
However, uncertainties in nuclear reaction rates limit our ability to... -
Zita Csapó (Wigner RCP, ELTE)05/11/2026, 11:00
This work studies the characteristic gluing problem in asymptotically flat spacetimes. In particular, it investigates the conditions under which initial data on different null hypersurfaces can be glued together to form a solution of the Einstein equations. The main focus is on the obstructions to such a gluing construction and their interpretation in terms of conserved quantities. Within the...
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Nefeli Chatz (University of Crete)05/11/2026, 11:15
This project investigates analytical and numerical black hole solutions in Anti-de-Sitter spacetimes. These geometries are of particular interest due to their holographic interpretation in gauge/gravity duality, representing states of a strongly coupled N=4 super Yang-Mills theory with a large number of colors, residing on a three-sphere. First, we derive the equations of motion from a...
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Richárd Tamás Varga (University of Szeged)05/11/2026, 11:30
We investigate the prospects for detecting nanohertz gravitational waves from individual supermassive black hole binaries (SMBHBs) using pulsar timing arrays (PTAs). We review the formation and gravitational radiation of SMBHBs, the principles of pulsar timing, and the current observational capabilities of PTAs, with particular emphasis on the expected sensitivity improvements offered by the...
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Dávid Szepessy (ELTE Fizika Doktori Iskola)05/11/2026, 11:45
Black holes can connect different regions of spacetime: in the Kerr solution, geodesics may pass through or around the ring singularity without destruction. Although perturbations are thought to destabilize such passages by generating additional singularities, their possible existence has direct observational consequences. We show that if Sgr A or M87 is described by the maximally extended...
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Ashika Achuthankutty (University of Szeged and HUN-REN Wigner RCP)05/11/2026, 12:00
In this work, we model slowly rotating neutron stars in massive scalar-tensor gravity, focusing on the massive Damour-Esposito-Farese model. Scalar-tensor theories of gravity with a dynamical scalar field coupling non-minimally to matter via a conformal factor $A(\phi)$ pose computational challenges beyond standard general relativistic solvers. In this theory, matter is coupled to an...
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Domonkos Szabó (Konkoly Observatory)05/11/2026, 12:15
Tidal Disruption Events (TDEs) occur when a star gets too close to a black hole, and its gravitational pull tears the star apart. These events result in a bright burst of electromagnetic radiation and provide important information about the black hole’s environment. When the star is disrupted, approximately half of its material forms an accretion disk around the black hole. The event is mostly...
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Anna Horváth05/11/2026, 14:00
In the Kaluza–Klein theory, one extra spatial dimension is added to usual spacetime. On one hand, particles moving in it gain excitations leading to a mass spectrum, which can be associated with hadronic states. Neutron stars are modelled using the equation of state of an extra-dimensional interacting zero-temperature Fermi gas. Macroscopic observables are calculated, compared to astronomical...
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Anna Göblyös (Szegedi Tudományegyetem)05/11/2026, 14:15
Blazars are promising candidate sources of high-energy astrophysical neutrinos, but the location of neutrino production in blazars remains uncertain. In our study (Kun et al. 2026), we investigate the temporal connection between a suspected IceCube neutrino flare and the gamma-ray and radio emission of the blazar GB6 J1542+6129. We performed a likelihood analysis of 17 years of Fermi-LAT data...
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Máté Pszota (Wigner RCP, Eötvös University)05/11/2026, 14:30
The methods of nonequilibrium thermodynamics allow the proper handling of local specific gravitational energy of a self-gravitating fluid. The hydrodynamic framework allows various models to be integrated, for example the Ohanian form of gravitational energy density, which is thermodynamically distinguished. The resulting field equations also allow a thermodynamic coupling to exist, which...
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Balázs Pál (Wigner Research Centre for Physics)05/11/2026, 14:45
Almost every cosmological simulation of the past four decades has been run in a periodic cube. The choice is so universal that it is rarely stated as an assumption, yet it is one: it gives the simulated universe the topology of a $3$-torus. But what that assumption costs us and how to deal with the problems it introduces? A cube is not rotationally symmetric, so angular momentum is not...
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Enikő Pichler (University of Debrecen)05/11/2026, 15:00
Areas of massive star formation are heavily affected by stellar winds and supernovae, therefore we expect enhanced turbulent flows in such regions. I present kinematic properties in dwarf galaxy DDO 43 (d = 7.8 Mpc), revisiting the high-resolution HI 21-cm VLA spectra of the LITTLE THINGS survey. The line profiles are carefully analysed in the CLASS radioastronomical data reduction software,...
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Júlia Katona05/11/2026, 15:45
The cosmic web of galaxies carries information about the growth and expansion history of the universe. Mapping the large-scale structure of the universe is the main goal of several current galaxy surveys, while also providing insights about the nature of dark matter and dark energy, which make up 95% of the universe.
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Cosmic voids are huge underdense regions in the galaxy distribution that are... -
Agnes Bogdan (ELTE)05/11/2026, 16:00
The large-scale structure of the Universe has been primarily shaped by the gravitational collapse of dark matter. On the largest scales, galaxies are distributed across galaxy groups, galaxy clusters, and filaments which surround vast cosmic voids. My work focuses on systems with masses in the range of 1012 - 1014 M☉. Although less massive than galaxy clusters, these structures are much more...
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Wancheng Xu05/11/2026, 16:15
Dual active galactic nuclei (AGN) play a crucial role in understanding supermassive black hole growth and evolution in merger systems. The milliarcsecond resolution provided by Very Long Baseline Interferometry (VLBI) is indispensable for resolving these closely separated systems. In this talk, I will present the high-resolution VLBI imaging investigations of two sub-kiloparsec-scale dual AGN...
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Borbála Nagy (Eötvös Loránd Tudományegyetem)05/11/2026, 16:30
This work presents a methodology for computing stellar intensities using the Synspec software, providing the foundation for deriving more accurate limb-darkening coefficients (LDCs) for exoplanet-characterization space missions such as ESA's Ariel. Because exoplanetary transit light curves are sensitive to the center-to-limb intensity variation of the host star, precise LDCs are critical for...
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Mohamed OUKLILENE (Budapest University of Technology and Economics), Mr Yazdan Mostajabaldaveh (Budapest University of Technology and Economics)05/11/2026, 16:45
Through the investigation of radial-velocity measurements of standard stars, we study the stability of the ACE fiber-fed échelle spectrograph at Piszkéstető and how instrumental and environmental effects influence the measured radial velocities. Understanding these effects is important in stellar spectroscopy, since systematic shifts in the measured spectra can affect the velocities derived...
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Bendegúz Koncz (University of Debrecen, GTGM Kft.)05/11/2026, 17:20
We present the Phase B planning of the Transient High-Energy Sky and Early Universe Surveyor (THESEUS) Infrared Telescope’s Calibration Unit, carried out during Phase A, with emphasis on LED-based calibration concepts and optical design considerations. The work outlines a structured testing strategy that combines individual device characterization with batch-level validation to ensure...
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Abdul Rahuman Mohamed Nawrouse (University of Pecs, Pecs, Hungary), Dr Gabor Facsko (Wigner Research Centre for Physics, Department of Space Physics, Budapest, Hungary)05/11/2026, 17:35
After crossing the bow shock and entering the magnetosheath, the solar wind experiences substantial modifications: plasma
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temperature, magnetic field strength, and particle density increase significantly, while the flow velocity decreases and its
direction is deflected. Magnetohydrodynamic (MHD) theory provides quantitative predictions for the changes in these
plasma parameters across the... -
Mr András Péter Joó (ELTE / Konkoly-Thege Miklós Csillagászati Intézet)05/11/2026, 17:50
The InfraRed Telescope (IRT) aboard the proposed THESEUS mission requires a stable and well-characterised detector response to achieve its science objectives, particularly for the rapid localisation and redshift determination of high-energy transients. This is enabled by an internal Calibration Unit designed to provide spatially uniform and temporally stable near-infrared illumination...
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Veronika Napsugár Csillag (ELTE, HUN-REN CSFK CSI)06/11/2026, 09:00
Our project’s aim is to find out more information about the impact of UV-C radiation on multicellular organisms connected to space exploration and exoplanet habitability. It is an interdisciplinary collaboration between the fields of astronomy and biology. Through the examination of TESS and Kepler lightcurves of different flaring stars with exoplanets in their habitable zone, such as Proxima...
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Anna Bognár (Konkoly Observatory, HUN-REN CSFK / Eötvös Loránd University)06/11/2026, 09:15
This presentation introduces a theoretical model that explores the
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possibilities of how liquid water could persist on the surface of
Mars. Indeed, hygroscopic salt crystals found on the surface are
capable of binding atmospheric water vapor, thereby forming a liquid
solution. The main challenge is preserving these solutions in the
extremely dry daytime environment. The model is based on... -
Katalin Nagy06/11/2026, 09:30
The formation of Warm Jupiters (with a period about 30 days and highly eccentric orbit (e > 0.3)) is still an open question. I investigated their possible early origins, ie. still embedded in the protoplanetary disk using numerical hydrodynamical simulations with the code GFARGO2. Assuming that planets are orbiting in the inner cavity of the disk, I found that planets can reach highly...
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Péter Csernyik (University of Toronto)06/11/2026, 09:45
Recently, several rings were discovered around various minor planets and asteroids. The origin and history of these rings are not well understood yet. We specifically focus on the ring of the dwarf planet Haumea and its perturbed nature. In this project, we are using numerical simulations with a modified version of the REBOUND N-body code to study the dynamical effects occurring in this...
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Gergő Lakatos (HUN-REN Atommagkutató Intézet)06/11/2026, 10:00
Carbonate minerals are treated as important tracers of geochemical conditions for a variety of different astronomical objects. Although, the fact that they have been detected in a number of environments where the conditions necessary for hydrothermal formation – universally accepted in the past as the dominant patway – are missing, has fueled interest about their possible alternative formation...
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István Gergely Hegedüs (ELTE, CSFK)06/11/2026, 10:15
The formation and orbital evolution of giant planets are strongly influenced by the physical properties and dynamical evolution of their protoplanetary disks. In this work, we investigate giant planet formation and migration in protoplanetary disks evolving under the combined effects of viscous accretion and magnetically driven disk winds. We adopt an analytical disk model to describe the time...
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Viktória Fröhlich (Universität Bern)06/11/2026, 11:00
Stars shed a large fraction of their mass during their lifetimes through dense stellar winds and supernova explosions. Because the gravitational potential that changes as this mass is lost, the orbits of planets, moons, and stellar companions can widen, become eccentric, or unbind entirely. Here, I present a series of studies that examine these consequences using variable-mass N-body...
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Nóra Varga (Eötvös Loránd University)06/11/2026, 11:15
The Transient High-Energy Sky and Early Universe Surveyor (THESEUS) will provide new opportunities for time-domain studies of young stellar objects through its soft X-ray, hard X-ray/γ-ray, and near-infrared capabilities. We investigate the potential of coordinated multi-wavelength observations of Galactic star-forming regions, with emphasis on X-ray flares, ultraviolet followup, and the most...
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Lívia Blanka Bárány (ELTE, HUN-REN CSFK CSI)06/11/2026, 11:30
Strange modes are unusual, non-classical pulsation behaviors that arise when the outer envelope of a Cepheid decouples from the interior. Mapping their expected instability regions based on stellar models is essential for the future observational identification of these objects. While prior research successfully established the theoretical instability strip of strange mode Cepheids on the...
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Erika Mochnács (University of Szeged)06/11/2026, 11:45
Type Ia supernovae are one of the most significant stellar explosions since they can be used for distance measurements in the universe. Among their subclasses, Type Iax supernovae show the highest diversity while being the lowest energy explosions of all Type Ia. Our aim is to study their origins and the possibility of expanding the distance ladder with them. One of the key steps of my work...
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Anna Görgei (HUN-REN CSFK, Konkoly Observatory)06/11/2026, 12:00
Magnetic activity in cool stars is closely linked to stellar rotation and dynamo processes. Open clusters offer a controlled environment for investigating stellar activity because their members share ages, distances, and chemical compositions. We investigate how stellar age and effective temperature influence flare activity in cool stars, and search for signatures of coronal mass ejections...
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Zsófia Bora (Hun-Ren CSFK KTM CSI)06/11/2026, 12:15
Type Ia supernovae (SNe Ia) are thermonuclear explosions of white dwarfs in binary systems, and have been widely used for astronomical distance measurements for decades. Despite their long history of observation however, there are many unknowns about the physical parameters of the progenitor star and the explosion mechanism itself. One of these unknowns is the presence of so-called...
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Márton Truszek (University of Szeged)06/11/2026, 14:00
Molecular astrophysics in supernova is gaining momentum in recent years, especially since the start of the science mission of James Webb Space Telescope (JWST). Applying radiative transfer theory is a key to connect these two fields of research: we can take into account molecular abundances and generate model spectra, which could allow us to deduce molecular components in the supernova...
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Barbara Keresztes (ELTE Eötvös Loránd University, Budapest)06/11/2026, 14:15
Dust grains are important components of the interstellar medium (ISM). Their surfaces are typically covered by icy mantles formed through the condensation of gas-phase species of the ISM. Upon exposure to external irradiation, such as cosmic rays, chemical reactions can be initiated within these ice layers. [1] These reactions lead to the formation of new chemical species, some of which can...
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Gábor G. Balázs (Konkoly Observatory, HUN-REN CSFK)06/11/2026, 14:30
Massive stars end their hydrostatic evolution in energetic explosions known as core-collapse supernovae (CCSNe), synthesizing and ejecting intermediate-mass and iron-peak isotopes into the interstellar medium. Following the initial explosion, CCSNe can be observed for several hundred days, powered primarily by the radioactive decay of newly synthesized radioactive isotopes, mainly associated...
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Réka Somogyfoki06/11/2026, 14:45
Thermodynamic volume and extensivity in black hole thermodynamics
Black holes lack a coordinate-independent notion of volume, so their thermodynamics is non-extensive. In extended AdS thermodynamics, the mass is treated as enthalpy and the cosmological constant as pressure, but for Schwarzschild-AdS black holes, the resulting volume is fixed by the entropy, leaving the state space...
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Kata Karácsonyi (University of Szeged & HUN-REN Wigner RCP)06/11/2026, 15:00
Higher harmonics from asymmetric compact binaries may enter the Einstein Telescope’s observing band before the dominant quadrupole signal. This ext the interval over which Earth’s rotation changes the detector response. We examine how much noise-weighted signal accumulates during this earlier interval, comparing a triangular detector in the Euregio Meuse–Rhine region with two pairs of...
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Zétény Lőkös-Birdal (Konkoly Observatory / ELTE)06/11/2026, 15:15
In the standard $\Lambda$CDM model of cosmology, the equation-of-state for dark energy is $w = p_{DE}/\rho_{DE} = -1$, which implies a constant energy density throughout the evolution of the Universe. However, recent observations of cosmic expansion and gravitational lensing increasingly favour a dynamic, time-varying dark energy. In the literature, the Chevallier–Polarski–Linder (CPL)...
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