Explanipedia

SN 2023ixf in M101: Physical Parameters from Bolometric Light Curve Modeling Open

J. Vinkó, Zsofia R. Bodola, Ákos Gődény, Szelina Fruzsina Csák, Réka Könyves-Tóth , et al. · 2025

We present new photometric observations of the core-collapse supernova SN 2023ixf occurred in M101, taken with the RC 80 and BRC80 robotic telescopes in Hungary. The initial nickel mass from the late-phase bolometric light curve extending …

JWST occultation reveals unforeseen complexity in Chariklo's ring system Open

P. Santos-Sanz, A. R. Gomes-Júnior, B. E. Morgado, Y. Kılıç, Csilla Kalup , et al. · 2025

Ring systems have recently been discovered around several small bodies in the outer Solar System through stellar occultations. While such measurements provide key information on ring geometry and dynamical interactions, little is known abo…

Matching seismic masses for RR Lyrae-type and oscillating red horizontal branch stars in M4 Open

L. Molnár, H. Netzel, Madeline Howell, Csilla Kalup, Meridith Joyce · 2025

Globular clusters offer a powerful way to test the properties of stellar populations and the late stages of low-mass stellar evolution. For this paper we studied oscillating giant stars and overtone RR Lyrae-type pulsators in the nearest g…

SN 2023ixf in M101: physical parameters from bolometric light curve modeling Open

Zs. R. Bodola, R. Konyves-Toth, I. Csányi, B. Cseh, T. Hegedüs , et al. · 2025

We present new photometric observations of the core-collapse supernova SN 2023ixf occurred in M101, taken with the RC80 and BRC80 robotic telescopes in Hungary. The initial nickel mass from the late-phase bolometric light curve extending u…

Empirical Globular Cluster Ridgeline Construction on Gaia Data Open

Anett Simon-Zsók, L. Molnár, Csilla Kalup, Meridith Joyce · 2025

We present a new method and a corresponding code to compress the color–magnitude diagram (CMD) of a globular cluster into a representative curve, called a ridgeline, that can be more readily compared to isochrone models, among other applic…

Empirical Globular Cluster Ridgeline Construction on Gaia Data Open

Anett Simon-Zsók, L. Molnár, Csilla Kalup, Meridith Joyce · 2025

We present a new method and a corresponding code to compress the color magnitude diagram of a globular cluster into a representative curve, called a ridgeline, that can be more readily compared to isochrone models, among other applications…

Probing Internal Structure Through Extremes: The Fastest Rotators Among Hilda and Jovian Trojan Asteroids Open

Nóra Takács, Csaba Kiss, Róbert Szakáts, E. Plachy, Csilla Kalup , et al. · 2025

The rotational characteristics of small bodies in the Solar System serve as critical constraints on their internal structure, composition, and collisional evolution[1,2]. The break-up rotation rate of asteroids defines an upper bound on th…

ALMA submm measurements of the trans-Neptunian binary system satellites Ilmarë, Actaea, Hi’iaka and Namaka Open

Csaba Kiss, K. É. Gabányi, A. Moór, Thomas Müller, E. Fernández-Valenzuela , et al. · 2025

While a significant fraction of large Trans-Neptunian Objects (TNOs) possess satellites, our understanding of the mechanisms that could lead to their formation of these systems remains limited. The prevailing view is that giant impacts are…

Characterising Grains and Composition in Small-Body Ring Systems: A Case Study of Haumea's Ring Open

Csilla Kalup, Csaba Kiss · 2025

During the last decade, occultation measurements have revealed that not only giant planets can host a ring system: Centaur-type objects Chariklo and presumably Chiron, and the dwarf planets Haumea and Quaoar also harbor rings, either singl…

The 2023 Outburst of the Gaia Alerted EXor Gaia23bab Open

Z. Nagy, Á. Kóspál, P. Ábrahám, T. Giannini, M. Kun , et al. · 2025

Episodic accretion is a fundamental process in the build-up of the stellar mass. EX Lupi-type eruptive young stars (EXors) represent one of the main types of episodic accretion. We study the recently discovered EXor Gaia23bab during its 20…

Three Fast-spinning Medium-sized Hilda Asteroids Uncovered by TESS Open

Nóra Takács, Csaba Kiss, Róbert Szakáts, E. Plachy, Csilla Kalup , et al. · 2025

Hilda asteroids, which orbit in a 3:2 resonance with Jupiter, serve as key indicators of dynamical processes in the early solar system. Their spin rates, an important probe of these mechanisms, can constrain their density and collisional e…

Short- and long-term variations of the high mass accretion rate classical T Tauri star DR Tau Open

Gabriella Zsidi, Á. Kóspál, P. Ábrahám, E. Alécian, Silvia H. P. Alencar , et al. · 2025

Context. Classical T Tauri stars are newly formed, low-mass stars, which may display both periodic and random variations in their brightness. These systems are surrounded by a circumstellar disk, from which material falls onto the stellar …

Three fast-spinning medium-sized Hilda asteroids uncovered by TESS Open

Nóra Takács, Csaba Kiss, Róbert Szakáts, E. Plachy, Csilla Kalup , et al. · 2025

Hilda asteroids, which orbit in a 3:2 resonance with Jupiter, serve as key indicators of dynamical processes in the early solar system. Their spin rates, an important probe of these mechanisms, can constrain their density and collisional e…

Asteroid sizes determined with thermophysical model and stellar occultations Open

Antoine Choukroun, A. Marciniak, Josef Ďurech, Julia Perła, W. Ogłoza , et al. · 2025

Context . The sizes of many asteroids, especially slowly rotating, low-amplitude targets, remain poorly constrained due to selection effects. These biases limit the availability of high-quality data, leaving size estimates reliant on spher…

The 2023 outburst of the Gaia alerted EXor Gaia23bab Open

Z. Nagy, Á. Kóspál, P. Ábrahám, T. Giannini, M. Kun , et al. · 2025

Episodic accretion is a fundamental process in the build-up of the stellar mass. EX Lupi-type eruptive young stars (EXors) represent one of the main types of episodic accretion. We study the recently discovered EXor Gaia23bab during its 20…

Gaia20bdk – New FU Ori-type star in the Sh 2-301 star-forming region Open

M. Siwak, Á. Kóspál, P. Ábrahám, G. Marton, Paweł Zieliński , et al. · 2025

Context. We analyse multi-colour photometric and spectroscopic observations of the young stellar object (YSO) Gaia20bdk. Aims. We aim to investigate the exact nature of the eruptive phenomenon that the star has been undergoing since 2018. …

Three fast-rotating Jovian Trojans identified by TESS set new population density limits Open

Csaba Kiss, Nóra Takács, Csilla Kalup, Róbert Szakáts, L. Molnár , et al. · 2025

Here we report on the identification of the three fastest rotating Jovian Trojans with reliable population assignment, using light curve data from the Transiting Exoplanet Satellite Survey mission, also confirmed by Zwicky Transient Facili…

Gaia20bdk -- a new FUor in Sh 2-301 Star Forming Region Open

M. Siwak, Á. Kóspál, P. Ábrahám, G. Marton, Paweł Zieliński , et al. · 2024

Context. We analyse multi-colour photometric and spectroscopic observations of a Young Stellar Object Gaia20bdk. Aims. We aim to investigate the exact nature of the eruptive phenomenon that the star has been experiencing since 2018. Method…

Radiative transfer modeling of Haumea's dust ring Open

Csilla Kalup, L. Molnár, Csaba Kiss · 2024

Among the growing number of small body rings in the solar system, the ring of Haumea has a special status as it is likely suitable for direct imaging in the visible and submillimeter wavelengths. In this paper, we highlight its sole detect…

Asteroseismic masses of red giants in the Galactic Globular Clusters M9 and M19 Open

Madeline Howell, S. W. Campbell, Csilla Kalup, Dennis Stello, Gayandhi M De Silva · 2024

Asteroseismic masses of globular cluster (GC) stars are invaluable to investigate stellar evolution. Previously, only two GCs have been seismically studied. We present new detections of solar-like oscillations in the clusters M9 and M19, f…

Asteroseismic Masses of Red Giants in the Galactic Globular Clusters M9 & M19 Open

Madeline Howell, S. W. Campbell, Csilla Kalup, Dennis Stello, Gayandhi M De Silva · 2024

Asteroseismic masses of globular cluster (GC) stars are invaluable to investigate stellar evolution. Previously, only two GCs have been seismically studied. We present new detections of solar-like oscillations in the clusters M9 and M19, f…

Radiative Transfer Modeling of Haumea’s Dust Ring Open

Csilla Kalup, L. Molnár, Csaba Kiss · 2024

Among the growing number of small body rings in the solar system, the ring of Haumea has a special status as it is likely suitable for direct imaging in the visible and submillimeter wavelengths. In this paper, we highlight its sole detect…

Prominent Mid-infrared Excess of the Dwarf Planet (136472) Makemake Discovered by JWST/MIRI Indicates Ongoing Activity Open

Csaba Kiss, Thomas Müller, Anikó Farkas-Takács, A. Moór, Silvia Protopapa , et al. · 2024

We report on the discovery of a very prominent mid-infrared (18–25 μ m) excess associated with the trans-Neptunian dwarf planet (136472) Makemake. The excess, detected by the Mid-Infrared Instrument of the James Webb Space Telescope, along…

Prominent mid-infrared excess of the dwarf planet (136472) Makemake discovered by JWST/MIRI indicates ongoing activity Open

Csaba Kiss, Thomas Müller, Anikó Farkas-Takács, A. Moór, Silvia Protopapa , et al. · 2024

We report on the discovery of a very prominent mid-infrared (18-25 μm) excess associated with the trans-Neptunian dwarf planet (136472) Makemake. The excess, detected by the MIRI instrument of the James Webb Space Telescope, along with pre…

Matching seismic masses for RR Lyrae-type and oscillating red horizontal-branch stars in M4 Open

L. Molnár, H. Netzel, Madeline Howell, Csilla Kalup, Meridith Joyce · 2024

Globular clusters offer a powerful way to test the properties of stellar populations and the late stages of low-mass stellar evolution. In this paper we study oscillating giant stars and overtone RR Lyrae-type pulsators in the nearest glob…

Ejecta Masses in Type Ia Supernovae—Implications for the Progenitor and the Explosion Scenario* Open

Zsófia Bora, Réka Könyves-Tóth, J. Vinkó, D. Bánhidi, I Bíró , et al. · 2024

The progenitor system(s) as well as the explosion mechanism(s) of thermonuclear (Type Ia) supernovae are long-standing issues in astrophysics. Here we present ejecta masses and other physical parameters for 28 recent Type Ia supernovae inf…

Ejecta masses in Type Ia Supernovae -- Implications for the Progenitor and the Explosion Scenario Open

Zsófia Bora, Réka Könyves-Tóth, J. Vinkó, D. Bánhidi, I Bíró , et al. · 2024

The progenitor system(s) as well as the explosion mechanism(s) of thermonuclear (Type Ia) supernovae are long-standing issues in astrophysics. Here we present ejecta masses and other physical parameters for 28 recent Type Ia supernovae inf…

CHEOPS in-flight performance Open

A. Fortier, A. E. Simon, C. Broeg, G. Olofsson, A. Deline , et al. · 2024

Context . Since the discovery of the first exoplanet almost three decades ago, the number of known exoplanets has increased dramatically. By beginning of the 2000s it was clear that dedicated facilities to advance our studies in this field…

CHEOPS in-flight performance: A comprehensive look at the first 3.5 years of operations Open

A. Fortier, A. E. Simon, C. Broeg, G. Olofsson, A. Deline , et al. · 2024

CHEOPS is a space telescope specifically designed to monitor transiting exoplanets orbiting bright stars. In September 2023, CHEOPS completed its nominal mission and remains in excellent operational conditions. The mission has been extende…

The enigma of Gaia18cjb: A possible rare hybrid of FUor and EXor properties Open

Eleonora Fiorellino, P. Ábrahám, Á. Kóspál, M. Kun, J. M. Alcalá , et al. · 2024

Context. Gaia18cjb is one of the Gaia -alerted eruptive young star candidates that has been experiencing a slow and strong brightening during the last 13 years, similarly to some FU Orionis-type objects. Aims. The aim of this work is to de…

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