Moharana, Satyajeet; Hema, B. P; Pandey, Gajendra(American Astronomical Society, 2024-10-20)
Determining the He/H ratio in cool stars presents a fundamental astrophysical challenge. While this ratio is
established for hot O and B stars, its extrapolation to cool stars remains uncertain due to the absence of helium ...
Vinay Kumar, G; Devarapalli, Shanti Priya; Parthasarathy, M; Jagirdar, Rukmini; Stassun, K. G(Springer Nature B.V., 2024-10)
We present the first pulsation analysis of four totally eclipsing Algol systems S Cnc, SS Cet, TW And, and VW Cyg using the latest data available from Kepler (K2), and TESS databases. Based on the characteristics observed ...
Oza, Apurva V; Seidel, Julia V; Hoeijmakers, H. Jens; Unni, Athira; Kesseli, Aurora Y; Schmid, Carl A; Sivarani, T; Bello-Arufe, Aaron; Gebek, Andrea; Moritz Meyer zu, Westram; Sousa, S. G; Lopes, Rosaly M. C; Hu, Renyu; Kleer, Katherine de; Fisher, Chloe; Charnoz, Sebastien; Baker, Ashley D; Halverson, Sam; Schneider, Nick M; Psaridi, Angelica; Wyttenbach, Aurelien; Torres, Santiago; Bhatnagar, Ishita; Johnson, Robert E(American Astronomical Society, 2024-10-01)
Neutral sodium (Na i) is an alkali metal with a favorable absorption cross section such that tenuous gases are easily illuminated at select transiting exoplanet systems. We examine both the time-averaged and time-series ...
Kurian, K. S; Stalin, C. S; Wylezalek, D; Lyubenova, Mariya; Adhikari, T. P; Devaraj, A; Sagar, R; Kissler-Patig, Markus; Mondal, Santanu(American Astronomical Society, 2024-10-10)
Active galactic nuclei (AGN) feedback and its impact on their host galaxies are critical to our understanding of galaxy evolution. Here, we present a combined analysis of new high resolution ultraviolet (UV) data from the ...
Saleh, P. R; Singh, Tanveer; Hazarika, D; Rajkumari, Surabhi; Rajkumar, Saurabh; Das, Pritam; Parihar, P. S; Saikia, E(Elsevier B.V, 2024-10)
The astronomical data analysis consists of two crucial process; data reduction of the captured images and data
analysis of the derived magnitudes. We present the platform ASIVA, a data analysis platform which comes along ...
Sidharth, A. V; Shridharan, B; Mathew, B; Devaraj, A; Cysil, T. B; Stalin, C. S; Arun, R; Bhattacharyya, S; Kartha, S. S; Robin, T(EDP Sciences, 2024-10)
Aims. In this study, we demonstrate the efficacy of the Ultraviolet Imaging Telescope (UVIT) in identifying and characterizing white dwarfs (WDs) within the Milky Way Galaxy.
Methods. Leveraging the UVIT point-source ...
Teja, Rishabh Singh; Goldberg, Jared A; Sahu, D. K; Anupama, G. C; Singh, Avinash; Swain, Vishwajeet; Bhalerao, Varun(American Astronomical Society., 2024-10-10)
We present detailed multiband photometric and spectroscopic observations and analysis of a rare core-collapse supernova, SN 2021wvw, that includes photometric evolution up to 250 days and spectroscopic coverage up to 100 ...
The magnetic field strength and its topology play an important role in understanding the formation, evolution, and dynamics of the solar corona. Also, it plays a significant role in addressing long-standing mysteries such ...
This study investigates orbital parallax in gravitational microlensing events, focusing on OGLE-2017-BLG-0103 and OGLE-2017-BLG-0192. For events with timescales ≤60 days, a Jerk-Parallax degeneracy arises due to high Jerk ...
Sampoorna, M; Paletou, F; Bommier, V; Lagache, T(EDP Sciences, 2024-10)
In the present paper we consider the full nonlocal thermodynamic equilibrium (non-LTE) radiation transfer problem. This formalism allows us to account for deviation from equilibrium distribution of both the radiation field ...
George, K; Poggianti, B. M; Omizzolo, A; Vulcani, B; Cote, P; Postma, J; Smith, R; Jaffe, Y. L; Gullieuszik, M; Moretti, A; Subramaniam, A; Sreekumar, P; Ghosh, S. K; Tandon, S. N; Hutchings, J. B(EDP Sciences, 2024-10)
The assembly of galaxy clusters is understood to be a hierarchical process with a continuous accretion of galaxies over time, which increases the cluster size and mass. Late-type galaxies that fall into clusters can undergo ...
Mondal, Santanu; Chatterjee, Rwitika; Agrawal, Vivek K; Nandi, Anuj(Published by Cambridge University Press on behalf of Astronomical Society of Australia, 2024-10)
We conducted a study on the X-ray polarisation properties of MCG-5-23-16 by analysing long-term monitoring data from NuSTAR jointly with IXPE observations made in May and November 2022. The re-analysis of IXPE data gives ...
Zhang, C; Liu, Tie; Ren, Z. Y; Zhu, Feng Yao; Liu, Hongli; Wang, Ke; Wu, J, W; Li, D; Jiao, Sihan; Tatematsu, Kenichi; Juvela, Mika; Lee, C. W; Jiao, Wenyu; Bronfman, Leonardo; Zhou, Jianwen; Xu, Feng Wei; Tej, A; Hwang, Jihye; Archana Soam; Das, Swagat; Chibueze, J. O(Oxford University Press on behalf of Royal Astronomical Society, 2024-10)
It has been suggested that the line width of ions in molecular clouds is narrower than that of the co-existing neutral particles, which has been interpreted as an indication of the decoupling of neutral turbulence from ...
We present a UV, optical, and near-IR study of the star-forming complexes in the nearby peculiar galaxy NGC 3718, using Ultraviolet Imaging telescope, Galaxy Evolution Explorer, Spitzer, and DECam Legacy Survey imaging ...
Dust polarisation observations of starlight at multi-wavelengths helps us to find maximum polari6 sation, Pmax and the corresponding wavelength, λmax. This λmax is approximately proportional to 7 average grain size, thereby ...
Rawat, Vineet; Samal, M. R; Ojha, D. K; Brajesh, Kumar; Sharma, Saurabh; Jose, J; Sagar, R; Yadav, R. K(American Astronomical Society, 2024-09)
We present a detailed near-infrared study of an embedded cluster located in the hub of the giant molecular cloud G148.24+00.41 of mass ∼105 Me, with the TANSPEC instrument mounted on the 3.6 m Devasthal Optical Telescope. ...
Nandi, Payel; Stalin, C. S; Dam, Poulomi; Saikia, D. J(The American Astronomical Society, 2024-09-20)
Circumnuclear star formation (SF) is generally seen in galaxies hosting active galactic nuclei (AGN); however, the connection between the AGN activity and SF in them is less well understood. To explore this connection on ...
Solar spicules are plasma jets observed in the interface region between the visible solar surface and the corona. At any given time, there is a forest of spicules originating in the chromosphere of the Sun. While various ...
Paswan, Abhishek; Das, Mousumi; Rubinur, K(The American Astronomical Society, 2024-09-10)
In the last decade, there have been several discoveries of active galactic nuclei (AGN) in dwarf galaxies including an AGN in an ultracompact dwarf galaxy with a black hole mass >106 Me. However, finding a supermassive ...
Chatterjee, Debjit; Jana, A; Chang, Hsiang-Kuang(The American Astronomical Society, 2024-09-01)
Soft X-ray transients (SXTs) are a subclass of the low-mass X-ray binaries that occasionally show a sudden rise in their soft X-ray luminosity; otherwise, they remain in an extremely faint state. We investigate the accretion ...