• Application of coherent structure tracking to solar Doppler maps to determine horizontal velocity fields at the sun's surface 

  Sampoorna, M; Roudier, T; Paletou, F (EDP Sciences, 2026-09)

  Context. Coherent structure tracking (CST) is a technique for determining solar surface horizontal flows at high spatial and temporal resolution by tracking the proper motion of granules. This technique has traditionally ...
• Discovery of an unbound flyby companion of UBC 63: In the immediate aftermath of a close encounter 

  Biswas, Samrat; Medhi, B. J; Messina, S; Zhu, Zhanpeng; Qin, Songmei; Deb, Sukanta; Sheikh, A. H; Das, H. S; Tamura, Motohide; Maheswar, G; Sagar, R (American Astronomical Society, 2026-09)

  We reinvestigate the open cluster UBC 63 using the Gaia Data Release 3 and show that, rather than being a single cluster as previously classified, it is a compelling candidate for a double cluster undergoing an unbound ...
• Understanding the travel-time asymmetry of acoustic waves in sunspots with time─distance helioseismology 

  Li, Haiyu; Felipe, T; Khomenko, E; Tian, H; Rajaguru, S. P; Gao, Yuhang (American Astronomical Society, 2026-09-01)

  Mapping the subsurface structure and flow field of sunspots has been a challenging task for helioseismology. In this work, we investigate the propagation of acoustic waves in a sunspot in NOAA active region 11312 using ...
• Solar spicule rotation driven by plasma curtain-vortex interactions 

  Dey, Sahel; Chatterjee, Piyali; Erdelyi, Robertus (American Astronomical Society, 2026-09-01)

  Rotational and transverse motions are frequently observed in solar spicules, yet the physical origin of these motions remains debated. We investigate how apparent spicule rotation arises in a stratified, magnetized solar ...
• Comparative 3D asymmetric expansion and angular-width evolution of fast and slow coronal mass ejections 

  Agarwal, Anjali; Mishra, Wageesh; Zhang, Jie; Khuntia, Soumyaranjan; Temmer, Manuela (American Astronomical Society, 2026-09-01)

  The radial and lateral dimensions of coronal mass ejections (CMEs) influence their duration and probability of encounter at Earth. These properties are linked to the expansion speeds of CMEs in different radial and lateral ...
• Complex energy-dependent behaviour of quasiperiodic oscillations observed in GRS 1915+105 

  Sharma, Vaibhav; Misra, R; Jithesh, V; Chaudhary, Shivani; Jirawala, Khushi; Yadav, J. S; Jain, Pankaj; Juris, N. J (American Astronomical Society, 2026-09-10)

  We present complex energy-resolved properties of quasiperiodic oscillations (QPOs) in the black hole X-ray binary GRS 1915+105 using an observation from the LAXPC instrument onboard AstroSat. Power density spectra (PDSs) ...
• Cosmic chance superpositions: Largest catalog of quasar-galaxy pairs at a projected separation of D ≲ 20 kpc 

  Guha, Labanya Kumar; Srianand, R; Dutta, Rajeshwari (American Astronomical Society, 2026-09-10)

  We present the largest catalogue to date of Galaxies On Top Of Quasars (GOTOQs)---systems where the sight line to a background quasar passes directly through or very close to a foreground galaxy. Using ~1.1 million quasar ...
• Local patch analysis of ACT DR6 convergence map using morphological statistics 

  Bashir, Masroor; Nidharssan, S; Pravabati, C; Fazlu, Rahman; Goyal, Priya; Appleby, S; Park, C (American Physical Society, 2026-09-15)

  We perform a comprehensive hierarchical, multiscale morphological analysis to search for anomalous behavior in the large-scale matter distribution, using the convergence map from the Atacama Cosmology Telescope Data Release ...
• Radiation-driven evolution and gas kinematics of the bright-rimmed cloud SFO 25 

  Porel, Puja; Archana Soam; Vacca, William D; Karoly, Janik (Oxford University Press on behalf of Royal Astronomical Society, 2026-09)

  Bright-rimmed clouds (BRCs) are valuable laboratories for investigating how ionizing radiation from massive stars reshapes molecular clouds and influences star formation. We present a kinematic and dynamical study of the ...
• UOCS XX: Ultraviolet signatures of binary evolution in the open cluster Berkeley 21 

  Panthi, Anju; Deshmukh, Sanmesh; Chand, Komal; Vaidya, Kaushar (Oxford University Press on behalf of Royal Astronomical Society, 2026-09)

  We present a multiwavelength study of the intermediate-age (∼2.1 Gyr) open cluster Berkeley 21 using ultraviolet observations from AstroSat/UVIT together with archival optical and infrared data. A machine learning-based ...
• Spatial correlations of PAH, UV, Hα emission and IMF─PAH variations in the star-forming complexes of NGC 628 

  Amrutha, S; Rigopoulou, Dimitra; Mousumi Das; Yadav, Jyoti (Oxford University Press on behalf of Royal Astronomical Society, 2026-09)

  We examine the spatial correlation of emission from polycyclic aromatic hydrocarbons (PAH) (3.3, 7.7, and 11.3 µm) with the far-ultraviolet(FUV), near-ultraviolet(NUV), and Hα emission from star-forming complexes(SFCs)in ...
• Installation and commissioning of an in-house developed table-top Fabry-Perot interferometer and the quality of data recorded from it - a system that is made in India 

  Mahavarkar, Prasanna; Sriram, S; Remya, B. S; Joshi, Bhagyashree; Gurubaran, S (Springer Nature, 2026-09)

  We present the design, indigenous development, and commissioning of a compact table-top Fabry-Perot interferometer (FPI) for high-resolution airglow observations. The system was initially tested at the Centre for Research ...
• Caught in the act: Interaction-driven evolution in the nearby compact galaxy group Robert's Quartet (SCG0018-4854) 

  Keshri, Saili; Barway, Sudhanshu; Mousumi Das; Paswan, Abhishek (EDP Sciences, 2026-08)

  We present a spatially resolved multiwavelength study of the compact galaxy group Robert's Quartet (RQ; SCG0018-4854), aimed at understanding interaction-driven galaxy evolution in dense environments. The system comprises ...
• Unveiling the nature of barium stars: I. Asteroseismic masses and the evolutionary link between Ba dwarfs and giants 

  Sarmah, Lupamudra; Bharat Kumar, Y; Campbell, S. W; Maben, Sunayana; Reddy, B. E (EDP Sciences, 2026-08)

  Context. Barium star systems are excellent sites for studying asymptotic giant branch (AGB) nucleosynthesis, binary evolution, and mass transfer processes. However, an accurate estimation of their fundamental stellar ...
• Feeding and feedback in dwarf galaxies (FeeD) I. Evidence of nuclear ultra-fast and galaxy-scale outflows in the dwarf galaxy Arp 151 

  Mondal, Santanu; Patel, Ankit; Mezcua, M; Joshi, Ravi; Xu, Y; Aditya, K; Subramanian, S; Rodriguez Morales, V (EDP Sciences, 2026-08)

  Feeding and feedback regulated by supermassive black holes play a central role in galaxy growth and evolution, yet these processes remain poorly understood in low-mass galaxies. In particular, the presence, properties, and ...
• Formation and eruption of filament channel in solar active region 12975: insights from observations and simulations of magnetic field evolution 

  Mishra, Dinesh; Vemareddy, P; Kumar, Brajesh (American Astronomical Society, 2026-08-20)

  We studied the magnetic field evolution of active region (AR) 12975 using a time-dependent magnetofrictional model. This AR produced two consecutive coronal mass ejections associated with M-class flares on 2022 March 28. ...
• Properties of faint X-ray activity of XTE J1908+094 in 2019 

  Chatterjee, Debjit; Jana, Arghajit; Chatterjee, Kaushik; Bhowmick, Riya; Nath, Sujoy Kumar; Chakrabarti, S. K; Mangalam, A; Debnath, Dipak (Multidisciplinary Digital Publishing Institute, 2021-06)

  We study the properties of the faint X-ray activity of Galactic transient black hole candidate XTE J1908+094 during its 2019 outburst. Here, we report the results of detailed spectral and temporal analysis during this ...
• Photometric metallicity of galactic RR lyrae stars in the gaia DR3 era 

  Prakash, Mahiguhappriya; Das, Susmita; Singh, H. P; Kumar, Nitesh (Multidisciplinary Digital Publishing Institute, 2026-06)

  RR Lyrae stars are pulsating variables crucial for distance determination and galactic structure studies. Metallicities of fundamental-mode (RRab) RR Lyrae stars are commonly derived from photometry using empirical relations ...
• Constraining neutron-capture nucleosynthesis from surface chemical composition of chemically peculiar stars: The puzzling case of HE 1005-1439 

  Goswami, A; Choplin, Arthur; Goswami, P. P; Siess, L; Goriely, S (Multidisciplinary Digital Publishing Institute, 2026-06)

  The chemical composition of stellar atmospheres provides a valuable window into the complex processes of stellar nucleosynthesis. Among chemically peculiar cool stars, many objects are the products of mass transfer in ...
• Bar-driven gas redistribution suppresses star formation in spiral galaxies: Evidence from dust lanes in NGC 3351 

  George, K; Subramanian, S (EDP Sciences, 2026-06)

  We present observational evidence, based on high-resolution imaging from HST, ALMA, and AstroSat/UVIT, that the redistribution of gas driven by the bar in the face-on spiral galaxy NGC 3351 results in suppressed star ...

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