Sicardy, B; Tej, A; Gomes-Júnior, A. R; Romanov, F. D; Bertrand, T; Ashok, N. M; Lellouch, E; Morgado, B. E; Assafin, M; Desmars, J; Camargo, J. I. B; Kilic, Y; Ortiz, J. L; Vieira-Martins, R; Braga-Ribas, F; Ninan, J. P; Bhatt, B. C; Pramod Kumar, S; Swain, V; Sharma, S; Saha, A; Ojha, D. K; Pawar, G; Deshmukh, S; Deshpande, A; Ganesh, S; Jain, J. K; Mathew, S. K; Kumar, H; Bhalerao, V; Anupama, G. C; Barway, Sudhanshu; Brandeker, A; Floren, H. G; Olofsson, G; Bruno, G; Mao, Y. M; Ye, R. H; Zou, Q. Y; Sun, Y. K; Shen, Y. Y; Zhao, J. Y; Grishin, D. N; Romanova, L. V; Marchis, F; Fukui, K; Kukita, R; Benedetti-Rossi, G; Santos-Sanz, P; Dhyani, N; Gokhale, A; Kate, A(EDP Sciences, 2024-02)
Context. In about 2000, the south pole of Triton experienced an extreme summer solstice that occurs every ∼650 years, when the subsolar latitude reached about 50°S. Bracketing this epoch, a few occultations probed the ...
Solar flares are known to leave imprints on the magnetic field in the photosphere, often manifested as an abrupt and
permanent change in the downward-directed Lorentz force in localized areas inside the active region. Our ...
We report superluminal jet motion with an apparent speed of βapp = 1.65 ± 0.57 in the radio-quiet (RQ) lowionization nuclear emission-line region (LINER) galaxy KISSR 872. This result comes from two-epoch phasereferenced ...
We report 850 μm continuum polarization observations toward the filamentary high-mass star-forming region
NGC 2264, taken as part of the B-fields In STar forming Regions Observations large program on the James Clerk Maxwell ...
Coronal magnetic fields evolve quasi-statically over long timescales and dynamically over short timescales. As of
now there exist no regular measurements of coronal magnetic fields, and therefore generating the coronal ...
Dhanush, S. R; Subramaniam, A; Nayak, Prasanta K; Subramanian, S(Oxford University Press on behalf of Royal Astronomical Society, 2024-02)
We present a detailed view of cluster formation (CF) to trace the evolution and interaction history of the Magellanic Clouds
(MCs) in the last 3.5 Gyr. Using the Gaia DR3 data, we parametrized 1710 and 280 star clusters ...
Bhargava, Yash; Dewangan, Gulab Chand; Anupama, G. C; Kamath, U. S; Sonith, L. S; Singh, Kulinder Pal; Drake, J. J; Beardmore, A; Luna, G. J. M; Orio, M; Page, K. L(Published by Oxford University Press on behalf of Royal Astronomical Society, 2024-02)
Nova Her 2021 or V1674 Her was one of the fastest novae to be observed so far. We report here the results from our timing and
spectral studies of the source observed at multiple epochs with AstroSat. We report the detection ...
Rajput, Bhoomika; Mandal, Amit Kumar; Pandey, Ashwani; Stalin, C. S; Max-Moerbeck, Walter; Mathew, Blesson(Published by Oxford University Press on behalf of Royal Astronomical Society, 2024-02)
The correlation between optical and γ-ray flux variations in blazars reveals a complex behaviour. In this study, we
present our analysis of the connection between changes in optical and γ-ray emissions in the blazar Ton ...
Yadav, R. K. S; Dattatrey, Arvind K; Rangwal, Geeta; Subramaniam, A; Bisht, D; Sagar, R(American Astronomical Society, 2024-02-01)
We present the study of four far-ultraviolet (FUV) bright stars in the field of the open cluster NGC 2420 using the
Ultra Violet Imaging Telescope mounted on AstroSat. The three stars 525, 527, and 560 are members, while ...
Using multi-instrument and multiwavelength observations, we studied a coronal mass ejection (CME) that led to an
intense geomagnetic storm on 2023 April 23. The eruption occurred on April 21 in solar active region (AR) ...
Since the start of science operations in 1993, the twin 10-m W. M. Keck Observatory (WMKO) telescopes have continued to maximize their scientific impact and to produce transformative discoveries that keep the observing ...
Gondhalekar, Y; Safonova, M; Saha, S(Elsevier B.V., 2023-07)
Image restoration in astronomy has been considered a vital step in many ground-based observational
programs that often suffer from sub-optimal seeing due to atmospheric turbulence, distortion of stellar
shapes due to ...
The use of innovative ideas and the latest technology have undoubtedly brought down telescope costs substantially. However, there are still ways to further reduce the cost of optical ground-based telescopes and make them ...
Understanding the statistical properties of synchrotron emission from our Galaxy is valuable from the perspective of observations targeting signals of cosmological origin, as well as for understanding physical processes ...
Divakar, Devika K; Saraf, Pallavi; Sivarani, T; Doddamani, Vijayakumar H(Indian Academy of Sciences, 2024-06)
A detailed study of stellar populations in Milky Way (MW) satellite galaxies remains an observational challenge due to their faintness and fewer spectroscopically confirmed member stars. We use unsupervised machine learning ...
Chromospheric differential rotation is a key component in comprehending the atmospheric coupling between the chromosphere and the photosphere at different phases of the solar cycle. In this study, we therefore utilize the ...
We report observations of the optical counterpart of the long gamma-ray burst (GRB) GRB 230812B and its associated supernova (SN) SN 2023pel. The proximity (z = 0.36) and high energy (Eγ,iso ∼ 1053 erg) make it an important ...
We present results from the analysis of 88 carbon stars selected from Hamburg/ESO (HES) survey using low-resolution spectra (R ∼1330 & 2190). The spectra were obtained with the Himalayan Faint Object Spectrograph Camera ...
We investigated the ionosphere response to the two severe geomagnetic storms in the ascending phase of solar cycle 25 which
occurred during the 23-24 March 2023 (SYM-Hmin = −169 nT) and 23-24 April 2023 (SYM-Hmin = −233 ...
Pandey, Ashwani; Kushwaha, Pankaj; Wiita, Paul J; Prince, Raj; Czerny, Bożena; Stalin, C. S(EDP Sciences, 2024-01)
Context. Transition blazars exhibit a shift from one subclass to the next during different flux states. It is therefore crucial to study them to understand the underlying physics of blazars. Aims. We probe the origin of ...