Dhanush, S. R; Subramaniam, A; Subramanian, S(American Astronomical Society, 2025-02-10)
We model the kinematics of the Small Magellanic Cloud (SMC) by analyzing the proper motions (PMs) from Gaia DR3 of nine different stellar populations, including young main-sequence (MS) stars (<2 Gyr), red giant branch ...
Swain, Subhashree; Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S(American Astronomical Society, 2025-02-01)
The γ-ray detection from an astrophysical object indicates the presence of an extreme environment where highenergy radiation is produced. With the continuous monitoring of the γ-ray sky by the Fermi Large Area Telescope ...
Bhatnagar, Aditi; Avijeet Prasad; Rouppe van der Voort, L; Nobrega-Siverio, Daniel; Joshi, Jayant(EDP Sciences, 2025-01)
Context. Quiet-Sun Ellerman bombs (QSEBs) are small-scale magnetic reconnection events in the lower atmosphere of the quiet Sun. Recent work has shown that a small percentage of them can occur co-spatially and co-temporally ...
A fine abundance analysis of a recently discovered hydrogen-deficient carbon (HdC) star, A980, is presented.
Based on the observed high-resolution optical spectrum, we ascertain that A980 is a cool extreme helium (EHe) ...
Murthy, Jayant; Shull, J. Michael; Postman, Marc; Parker, Joel Wm; Redfield, Seth; Cunningham, Nathaniel; Gladstone, G. Randall; Pineau, Jon P; Brandt, Pontus; Verbiscer, Anne J.; Singer, Kelsi N; Weaver, H. A; Henry, R. C; Stern, S. Alan(American Astronomical Society, 2025-02)
We present new observations of the cosmic ultraviolet background (CUVB) at high Galactic latitudes (|b| > 40o ), made using the Alice UV spectrograph on board the New Horizons spacecraft. These observations were taken at ...
Ningombam, Shantikumar S; Mukhopadhyay, Swagata; Madhavan, B. L; Srivastava, A. K(Elsevier B.V, 2025-03-01)
The study examined sensitivity analysis of aerosol optical and radiative properties due to different versions
of SKYRAD.pack module (i.e. versions 4.2 and 5.0) along with stability and performance of sky radiometer
instruments ...
Ezhikode, Savithri H; Anilkumar, Hema; Arun, R; Mathew, Blesson; Jithesh, V; Bhattacharyya, Suman; Nedhath, Sneha; Cysil, T. B; Muneer, S; Kartha, Sreeja S; Kumar, S. P(Cambridge University Press on behalf of Astronomical Society of Australia, 2025-01)
Weak-line T Tauri stars (WTTS) exhibit X-ray flares, likely resulting from magnetic reconnection that heats the stellar plasma to very high temperatures. These flares are difficult to identify through targeted observations. ...
This study analyzes twelve years of wind speed and direction data collected at the proposed National Large Solar Telescope (NLST) site near Pangong Tso, Merak village, Leh-Ladakh. A weather station from Campbell Scientifc ...
Warwick, B; Lyman, J; Pursiainen, M; Coppejans, D. L; Galbany, L; Jones, G. T; Killestein, T. L; Kumar, A; Oates, S. R; Ackley, K; Anderson, Joseph P; Aryan, A; Breton, R. P; Chen, T. W; Clark, P; Dhillon, V. S; Dyer, Martin J; Gal-Yam, A; Galloway, D. K; Gutierrez, Claudia P; Gromadzki, Mariusz; Inserra, Cosimo; Jimenez-Ibarra, F; Kelsey, L; Kotak, R; Kravtsov, T; Kuncarayakti, H; Magee, M. R; Matilainen, K; Mattila, S; Muller-Bravo, T. E; Nicholl, M; Noysena, K; O'Brien, P; O'Neill, D; Palle, E; Pessi, T; Petrushevska, T; Pignata, G; Pollacco, D; Ragosta, Fabio; Ramsay, G; Sahu, A; Sahu, D. K; Singh, A; Sollerman, Jesper; Stanway, E; Starling, R; Steeghs, D; Teja, Rishabh Singh; Ulaczyk, K(Oxford University Press on behalf of Royal Astronomical Society, 2025-02)
SN 2023tsz is a Type Ibn supernova (SN Ibn), an uncommon subtype of stripped-envelope core-collapse supernovae (SNe), discovered in an extremely low-mass host. SNe Ibn are characterized by narrow helium emission lines in ...
Molecular clouds fragment under the action of supersonic turbulence and gravity, which results in a scale-free hierarchical distribution of star formation within galaxies. Recent studies suggest that the hierarchical ...
Polarimetry of stars at optical and near-infrared wavelengths is an invaluable tool for tracing interstellar dust and magnetic fields. Recent studies have demonstrated the power of combining stellar polarimetry with distances ...
The physical mechanisms responsible for bar formation and destruction in galaxies remain a subject of debate. While we have gained valuable insight into how bars form and evolve from isolated idealized simulations, in the ...
Contributions from the Indian gravity community have played a significant role in shaping several branches of astronomy and astrophysics. This document reviews some of the most important contributions and presents a vision ...
Abraham, Linn; Abraham, Sheelu; Kembhavi, A. K; Philip, N. S; Aniyan, A. K; Barway, Sudhanshu; Kumar, Harish(American Astronomical Society, 2025-01-10)
Morphological features in galaxies—like spiral arms, bars, rings, and tidal tails, etc.—carry information about their structure, origin, and evolution. It is therefore important to catalog and study such features and to ...
Although the star-formation process has been studied for decades, many important aspects of the physics involved remain unsolved. Recent advancements in instrumentation in the infrared, far-infrared, and sub-millimeter-wavelength ...
Swain, Subhashree; Stalin, C. S; Paliya, Vaidehi S; Saikia, D. J(Oxford University Press on behalf of Royal Astronomical Society, 2025-02)
Compact Symmetric Objects (CSOs) are a distinct category of jetted active galactic nuclei whose high-energy emission is not well understood. We examined the X-ray characteristics of 17 bona fide CSOs using observations ...
The habitability of a planet is influenced by both its parent star and the properties of its local stellar neighborhood. Potential threats to habitability from the local stellar environment mainly arise from two factors: ...
As part of the B-fields In Star-forming Region Observations survey, we present James Clerk Maxwell Telescope
(JCMT) 850 μm polarimetric observations toward the Orion integral-shaped filament (ISF) that covers three portions ...
An analysis of Gaia DR3 data of 67 R stars is presented and 57 of them are at high galactic latitudes. Three new variable stars are found. The long period luminous variable R stars and R8 stars may be variable carbon stars ...
Ca II K observations of the Sun have a great potential for probing the Sun’s magnetism and activity, as well as for reconstructing solar irradiance. The Kodaikanal Solar Observatory (KoSO) in India, houses one of the most ...