Meeting of Young Astronomers and Astrophysicists - FIKUT NEXTGEN

Session

Astronomical Instrumentation, Observational Techniques, and Space Plasma Physics

5 Nov 2026, 16:30

HUN-REN Wigner Research Centre for Physics

88. Stellar Intensity Profiles with Synspec for Ariel Transit Modeling

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...

117. Tracing Radial-Velocity Drift in the ACE Spectrograph: Instrumental Stability and Environmental Effects at Piszkéstető

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...

92. LED testing strategy and optical optimisation of the THESEUS Infrared Telescope’s Calibration Unit

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...

109. Testing shock jump predictions using THEMIS observations

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
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...

138. Mechanical Design Concept Challenges for the THESEUS InfraRed Telescope’s Calibration Unit

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...