Karthik Iyer (MScCompleted) : Eur. Phys. J. C 86, XXX (2026) Orbital dynamics and precession in magnetized Kerr spacetime: An exact analytical study of orbital dynamics and precession in magnetized Kerr spacetime is presented. Magnetic fields are shown to significantly modify orbital and epicyclic frequencies,
introduce an outermost stable circular orbit, and induce retrograde periastron precession, leading to distinct deviations from standard Kerr behavior with potential implications for QPO observations.
Sariga C M : New Astronomy, 127, 2026 A comparative study of occurrence rates and nature of Ultraluminous X-ray sources in spiral and elliptical galaxies: The paper presents a comparative study of Ultraluminous X-ray Sources (ULXs) occurring at a rate of one per galaxy and those occurring at higher rates in spiral and elliptical galaxies.
A clean dataset representing these two extremes has been generated, with its credibility ensured through an effective approach. Further, the host galaxy and source properties are investigated using these generated samples, leading to the identification of few differences in properties among these categories.
Adarsha H A : European Physical Journal C, 86, 278 (2026) Magnetically arrested transmutation of a compact star: A new mechanism called Magnetically Arrested Transmutation (MAT) is proposed, in which strong magnetic fields halt the growth of dark-matter-induced endoparasitic black holes inside compact stars. The MAT framework explains the possible survival of highly magnetized white dwarfs and magnetars, including PSR J1745–2900, in dark-matter-rich regions such as the Galactic centre, unlike their non-magnetic counterparts.
Muskan : RSC advances,16,16069 (2026) Conformational chirality in buckled molecular silicenes: a precursor for chiral magnets: “Conformational chirality” in molecular silicene rings induced by structural distortion is reported through computational investigations. Silicene-based chiral diradicals are designed by coupling silicene frameworks with organic radical, through which both chirality and magnetism are achieved. The developed systems are identified as promising candidates for applications in spintronics, quantum information science,and light-induced spin manipulation.
Arya Sudhakaran : Galaxies, 14 (1), 3 (2026) Probing the Dusty Torus of Seyfert Galaxy NGC 4151: A Multi-Band Study: Despite several efforts to investigate the accretion disk and torus, near-simultaneous broadband studies of the nuclear regions of radio-quiet AGNs remain lacking. NGC 4151, one of the closest and brightest Seyfert galaxies, provides an excellent laboratory for probing the circum-nuclear regions of AGNs. A detailed, near-simultaneous broadband spectral study of NGC 4151 is carried out during one of its historic minimum activity states,using archival data from the Ultraviolet (UV) to the Infrared (IR) regions. The radiative transfer code SKIRT was used to model the source and to constrain the properties of the torus. It was found that the observed broadband spectral energy distribution is best explained by a two-torus geometry with a polar conical shell structure.
Muskan : Computational and Theoretical Chemistry,1256,115631 (2026)
Computational and Theoretical Chemistry,1256,115631 (2026): A computational study of diarylmethyl diradicals connected through cumulene couplers is presented to investigate the variation of magnetic exchange coupling with cumulene length. Consistent ferromagnetic interactions are obtained using different DFT functionals, while bond length alternation and molecular orbital analysis reveal changes in electronic distribution.
Nilanjana Dey Choudhury (MSc completed): New Astronomy, 123, 102485 (2026)
Modelling the scattering by porous aggregate dust grains in the Far-Ultraviolet halos of Spica and Achernar: In this work, the FUV halos of Spica and Achernar are modelled using porous dust aggregates of different sizes and compositions distributed in a double-layered plane-parallel sheet, varying the cloud distance and optical depth to obtain the best fit. It is found that the halos are dominated by scattering from 0.05 μm porous aggregates, with amorphous silicate grains for Spica and carbonaceous grains for Achernar, and that Achernar’s foreground medium has a lower optical depth (0.032) than Spica (0.1), close to the local ISM value.
Adarsha H A : Physical Review D, 111, 103033 (2025) Accretion inside astrophysical objects: Effects of rotation and viscosity: A framework for accretion inside rotating astrophysical objects is developed by incorporating the effects of rotation and viscosity on endoparasitic black holes formed through dark matter collapse. It is shown that accretion can be stalled in rapidly rotating white dwarfs, leading to conical polar openings and preventing complete transmutation in some cases, whereas neutron stars undergo complete transmutation.despite rotational effects.
Bannanje Ananthamoorthy : PASA, 42, e154 (2025) Positive AGN feedback in the outskirts of nearby barred spiral galaxies?: A spatially resolved study of star formation in the outskirts of nearby barred spiral galaxies was carried out using high-angular-resolution ultraviolet imaging from the AstroSat Ultraviolet Imaging Telescope (UVIT), complemented by observations from the Galaxy Evolution Explorer. Star-forming knots in AGN-host galaxies exhibit higher star formation rate densities and UV attenuation and decline less rapidly with radius than in non-AGN galaxies.Findings in the study indicate that winds/radiation pressure from the central regions of active galaxies can promote star formation in the galaxy outskirts.
Vishnu Shreekara Bhat K : Journal of Threatened Taxa, 17(11), 27797-27805 (2025) Ecology and conservation concerns of Indianthus virgatus (Marantaceae): an endemic species of the Western Ghats–Sri Lanka Biodiversity Hotspot: The ecology, distribution, and threats to Indianthus virgatus, a rare monotypic endemic of the Western Ghats–Sri Lanka hotspot, were documented based on field surveys and compiled occurrence data.The populations were found to be small, fragmented, and restricted to wet forest habitats, with major threats posed by habitat loss, plantations, and invasive species. The findings highlight the high vulnerability of the species and emphasize the urgent need for conservation action and a global IUCN Red List assessment.
Bannanje Ananthamoorthy:MNRAS, 544, 3394 (2025) Enhanced UV emission knot in the giant radio galaxy NGC 315: hint of patchy star formation?: Using high-resolution ultraviolet (UV) observations from the AstroSat-Ultraviolet Imaging Telescope (UVIT), a compact UV-emitting knot was discovered in the giant radio galaxy NGC 315 at a projected distance of nearly 1.7 kpc from the center. The UV emission was attributed to ongoing star formation and was found to be spatially associated with dusty filaments observed in Hubble Space Telescope observations,indicating the presence of cold gas. The results suggest that the localized star formation may be linked to AGN jet-driven processes, with the gas supplied either through a minor merger or uplifted by the AGN jet.
Mahim B : Data in Brief, 63, 112225 (2025) Leaf functional trait dataset of 93 dominant woody species from the central Western Ghats, India: A comprehensive dataset of qualitative and quantitative leaf functional traits for 93 dominant woody species representing two distinct leafing phenologies and three growth forms from the central
Western Ghats of India. Quantitative assessments were conducted for nine key traits: leaf area (LA), mean thickness (LTH), specific leaf area (SLA), leaf dry matter content (LDMC), leaf tissue density (LTD), leaf nitrogen concentration (Leaf N), carbon-to-nitrogen ratio (C/N), and phytolith yield. Qualitative traits includes leaf shape, margin, surface, texture, apex, base, type, and latex presence.
Chumuiria Debbarma : Journal of Computational Chemistry, 46, e70230 (2025) Magnetic Exchange Interactions: Mechanistic Insights and Understanding Orbital Influences in Organic Diradicals: In this study, the underlying mechanism influencing the need for orbital planarity and the role of frontier orbital overlap in magnetic exchange interactions was studied by designing a series of
12 polyacene-coupled triarylmethyl diradicals, systematically increasing in length of polyacene and nine different DFT functionals were used for the calculation of the magnetic exchange coupling constant (J).The GGA functionals defined a more accurate spin state, hence more correct magnetic behavior than the meta-GGA and hybrid functionals. The planarity and overlap of the frontier molecular orbitals were foundto be the key factors in influencing the strength and behavior of the magnetic exchange interactions in diradicals, specifically, the overlap between SOMOs and LUMO.
Gayathri Rajendiran : Palaeogeography, Palaeoclimatology, Palaeoecology, 678,113254, (2025) Surface soil phytolith assemblages in different vegetational zones of the Nilgiri Biogeographical Region, Western Ghats, India: implications for palaeoclimatic interpretation: Surface soil phytolith assemblages from 70 sites across an elevational gradient (300-2400 m) in the Nilgiri Biogeographic Region, Western Ghats, were investigated. A total of 29 morphotypeswere identified, reflecting vegetation patterns ranging from C4-dominated lowland forests to mixed C3-C4 mid-elevations and grass-influenced montane systems, with elevation and precipitation recognised as the primary environmental controls. A modern phytolith reference framework for paleoenvironmental reconstruction was established, while limitations in vegetation specificity were also identified.
Karthik Iyer (MSc completed) : Phys. Rev. D 112, 024075 (2025) Spin precession in magnetized Kerr spacetime: An exact analytical study of gyroscopic spin precession in magnetized Kerr spacetime is presented. Magnetic fields are shown to induce a slower long-range decay of Lense–Thirring precession in magnetized Kerr spacetime, while significantly enhancing geodetic precession in magnetized Schwarzschild spacetime compared to the standard falloff behavior.
Muskan : The Journal of Physical Chemistry A,129,4426-4437 (2025) Strong Ferromagnetic Coupling between Co and Co2+ with Odd Electron (Anti)aromatic Radicals via Noncovalent Interaction: A computational investigation of magnetic interactions in odd-electron aromatic and antiaromatic radical–Co/Co²⁺ complexes is presented. Strong ferromagnetic exchange coupling is shown to arise in the absence of covalent bonding between the radicals and metal centers. Aromaticity analyses reveal a multidimensional aromatic character and a strong correlation between structural aromaticity and magnetic interaction.
Vishnu Shreekara Bhat K : Ecology and Evolution, 14(10): e70489 (2024) Modeling the Current and Future Distribution of Indianthus virgatus (Roxb.) Suksathan & Borchs.: A Monotypic Plant Endemic to the Western Ghats-Sri Lanka Biodiversity Hotspot: Species distribution modeling (MaxEnt and Wallace) was employed to predict the current and future habitat suitability of Indianthus virgatus, a monotypic endemic species of the Western Ghats–Sri Lanka hotspot. Key environmental drivers, including temperature seasonality and precipitation, were found to significantly influence its distribution, with both models demonstrating high predictive performance. Future climate
scenarios (2050 and 2070) indicate substantial habitat loss, underscoring the urgent need to conserve this critically endangered species.
Bannanje Ananthamoorthy : AJ, 168, 22 (2024) Detection of Faint Sources by the UltraViolet Imaging Telescope Onboard AstroSat Using Poisson Distribution of Background: An improved method for detecting faint ultraviolet (UV) sources was developed using observations from the AstroSat-Ultraviolet Imaging Telescope (UVIT) by accounting for the Poisson nature of the low UV background. The approach significantly enhanced source-detection sensitivity, revealing a large population of faint sources missed by conventional methods, most of which were found to have counterparts at other wavelengths. The results demonstrate that a more accurate treatment of the background can substantially improve UV source catalogs and enable the discovery of previously unexplored faint UV populations.
