Cluster Head

Prof. Ranjeet Kumar Brajpuriya

Program Lead

Prof. Santosh Dubey

• Laboratory Astrophysics: Experiments related to planetary and space physics.
• Solar Physics: Collaboration with ARIES on the Coronal heating problem.

• "On the Formation Height of Low-corona and Chromospheric Channels of the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO)", The Astrophysical Journal, 2024. DOI: 10.3847/1538-4357/ad7d8c
• "Height-Dependent Slow Magnetoacoustic Wave Amplitude and Energy Flux in Sunspot Atmospheres", Monthly Notices of the Royal Astronomical Society, 2025. DOI: 10.48550/arXiv.2504.15030

• Black Hole Physics: Study of black hole shadow, thermodynamic properties, and quasinormal modes.
• Solar Physics: Solar flares and Coronal Mass Ejection.

• "Black hole evaporation process and Tangherlini–Reissner–Nordström black holes shadow", Annals of Physics, 2024. DOI: 10.1016/j.aop.2024.169803
• "Effect of higher dimensions on rotating black holes shadow", New Astronomy, 2023. DOI: 10.1016/j.newast.2022.101945
• "Shadows of quintessential dark energy black holes in the domain of outer communication", Physics of the Dark Universe, 2023. DOI: 10.1016/j.dark.2023.101279

• Stellar Astrophysics: Study of stellar structure, evolution, and modeling.
• Galactic Globular Clusters: Observational and theoretical studies of globular clusters.
• Variable Stars: Analysis of light curves and variability mechanisms.
• RR Lyrae Stars: Multiwavelength photometry and pulsation modeling.
• Stellar Evolution and Modeling: Computational approaches to stellar interiors and evolution.

• "Physical parameters of stars in NGC 6397 using ANN-based interpolation and full spectrum fitting", New Astronomy, 2025. DOI: 10.1016/j.newast.2025.102416
• "Multiwavelength photometric study of RR Lyrae variables in the globular cluster NGC 5272 (Messier 3)", Monthly Notices of the Royal Astronomical Society, May 2024. DOI: 10.1093/mnras/stae1334
• "Predicting light curves of RR Lyrae variables using artificial neural network-based interpolation of a grid of pulsation models", Monthly Notices of the Royal Astronomical Society, March 2023. DOI: 10.1093/mnras/stad937

• Compact Object Astrophysics: Studying neutron stars and black holes in X-ray binary systems.
• X-ray Spectroscopy: Analyzing high-energy spectra to understand accretion and emission processes.
• Timing Analysis: Investigating variability and pulsations to probe spin and accretion dynamics.
• Cyclotron Line Studies: Using spectral features to measure magnetic fields in neutron stars.
• Broadband X-ray Observations: Combining data from multiple missions to study accreting systems.

• Timing analysis of Be/X-ray transient 4U 0115+63 during Type II outburst of 2023 using NuSTAR observations, Advances in Space Research, 2024. DOI: 10.1016/j.asr.2024.10.021
• Torque reversal and cyclotron absorption feature in HMXB 4U 1538-522, Monthly Notices of the Royal Astronomical Society, 2023. DOI: 10.1093/mnras/stad1285
• Discovery of cyclotron and narrow Fe Kα lines in HMXB GRO J1750-27, Monthly Notices of the Royal Astronomical Society: Letters, 2022. DOI: 10.1093/mnrasl/slac041
• Broad-band spectral analysis of LMXB 2S 0921-63 with Suzaku, Monthly Notices of the Royal Astronomical Society, 2022. DOI: 10.1093/mnras/stac2698

• X-ray Images of Black Holes.
• Timing Analysis of Black Hole Accretion.
• Active Galactic Nuclei.

• "Images and spectral properties of two-component advective flows around black holes: effects of photon bending", Monthly Notices of the Royal Astronomical Society, 2017. DOI: 10.1093/mnras/stw2975
• "Time-domain variability properties of XTE J1650-500 during its 2001 outburst: Evidence of disc-jet connection", Monthly Notices of the Royal Astronomical Society, 2020. DOI: 10.1093/mnras/staa2263

• Extremal Black Holes and Attractor Mechanism.
• Gauge/Gravity Correspondence.
• Gravitino and Cosmology.

• Journal of High Energy Physics (JHEP).
• General Relativity and Gravitation (GRG).
• International Journal of Modern Physics A (IJMPA).