8 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Aryabhatta Research Institute of Observational SciencesIN15 papers
- Indian Institute of AstrophysicsIN4 papers
- Goddard Space Flight CenterUS3 papers
- Kyambogo UniversityUG3 papers
- Mbarara University of Science and TechnologyUG3 papers
- Millennium Institute of AstrophysicsCL3 papers
- Center for Astrophysics Harvard & SmithsonianUS2 papers
- Christ UniversityIN2 papers
- Hiroshima UniversityJP2 papers
- Institute of AstronomyRU2 papers
- Instituto de Astrofísica de AndalucíaES2 papers
- Instituto de Astrofísica de CanariasES2 papers
20 papers
High-precision K2/TESS Photometry and HERMES Spectroscopy of Four Bright Field Stars
Otto Trust, Santosh Joshi, Benard Nsamba +13
Space-based photometry from K2 and TESS, coupled with high-resolution spectroscopy, provides a unique opportunity to re-examine the variability and chemical nature of four bright s…
X-Ray Spectral Variability of the TeV HBL Blazar PG 1553+113 with XMM-Newton
P. U. Devanand, Alok C. Gupta, Paul J. Wiita +2
We present an extensive X-ray spectral variability study of the TeV photon-emitting high-energy-peaked BL Lacertae object PG 1553+113, using the data from EPIC-PN camera of XMM-New…
V515 And: An Intermediate Polar in the Period Gap Exhibiting Outbursts
Srinivas M Rao, Jeewan C Pandey, Nikita Rawat +4
Using long-term observations from the Transiting Exoplanet Survey Satellite (TESS) along with spectroscopic observations from the 3.6 m Devasthal Optical Telescope (DOT), we presen…
Stroke Lesions as a Rosetta Stone for Language Model Interpretability
Julius Fridriksson, Roger D. Newman-Norlund, Saeed Ahmadi +10
Large language models (LLMs) have achieved remarkable capabilities, yet methods to verify which model components are truly necessary for language function remain limited. Current i…
HALO I: Photometric continuum reverberation mapping of Fairall 9
Amit Kumar Mandal, Francisco Pozo Nuñez, Vikram Kumar Jaiswal +23
We investigate the origin of inter-band continuum time delays in active galactic nuclei (AGNs) to study the structure and properties of their accretion disks. We aim to measure the…
SN 2021tsz: A luminous, short photospheric phase Type II supernova in a low-metallicity host
R. Dastidar, G. Pignata, N. Dukiya +14
We present the analysis of the luminous Type II Supernova (SN) 2021tsz, which exploded in a low-luminosity galaxy. It reached a peak magnitude of -18.88 0.13 mag in the b…
Chemical abundances and doppler imaging of the Ap Si/He-wk star HD 100357
Athul Dileep, Santosh Joshi, Sofya Alexeeva +11
We present the results of time-resolved photometry, abundance analysis and Doppler imaging of an Ap star, HD 100357. The {\it TESS} photometry revealed rotational modulation with a…
Unveiling the Variability and Chemical Composition of AL Col
Surath C. Ghosh, Santosh Joshi, Samrat Ghosh +9
Using \tess\ short-cadence (120\,s) SAP flux, we identified a rotational frequency of 0.09655\, (\,d). Wavelet analysis reveals that while…
Spectrum of five-times ionized krypton: Kr VI
Aftab Alam, Abid Husain, K. Haris +2
This work describes the spectral analysis of five-times ionized krypton ion (Kr VI) using a high-resolution spectrogram recorded on a 3 m normal incidence vacuum spectrograph in th…
Long-term investigation of an open cluster Berkeley 65
Tarak Chand, Saurabh Sharma, Koshvendra Singh +7
We present a decade-long investigation of a poorly studied cluster, Berkeley 65 (Be 65), using deep optical data from the telescopes of ARIES, Nainital Observatory. We estimate its…
X-Ray Spectral Variability of Thirteen TeV High Energy Peaked Blazars with XMM-Newton
P. U. Devanand, Alok C. Gupta, V. Jithesh +2
We present a comprehensive study of the X-ray spectral variability observed in 13 TeV photon emitting high energy peaked BL Lacs(HBLs). These data come from 54 XMM-Newton EPIC-PN p…
Exploring vector dark matter via effective interactions
Hrishabh Bharadwaj
We explore the properties of self-conjugate dark matter (DM) particles that predominantly interact with Standard Model electroweak gauge bosons, using an effective field theory app…
An Intermediate Luminosity GRB 210210A: The early onset of the external forward shock in the X-ray?
Rahul Gupta, A. K. Ror, S. B. Pandey +5
We have analyzed the prompt and afterglow characteristics of the intermediate luminosity burst ``GRB 210210A". Our prompt emission analysis indicates that GRB 210210A is among the…
mass and Muon in Inert 2HDM Extended by Singlet Complex Scalar
Hrishabh Bharadwaj, Mamta Dahiya, Sukanta Dutta +1
The deviations of the recent measurements of the muon magnetic moment and the boson mass from their SM predictions hint to new physics beyond the SM. In this article, we addres…
Testing particle acceleration in blazar jets with continuous high-cadence optical polarization observations
Ioannis Liodakis, Sebastian Kiehlmann, Alan P. Marscher +44
Variability can be the pathway to understanding the physical processes in astrophysical jets, however, the high-cadence observations required to test particle acceleration models a…
Exploring new physics via effective interactions
Ekata Singh, Hrishabh Bharadwaj, Devisharan
We investigate self-conjugate Dark Matter (DM) particles that primarily interact with standard model electroweak gauge bosons within an effective field theoretical framework. Our a…
SN 2019nyk: A rapidly declining Type II supernova with early interaction signatures
Raya Dastidar, Giuliano Pignata, Naveen Dukiya +9
We present an optical photometric and spectroscopic analysis of the fast-declining hydrogen-rich Type II supernova (SN) 2019nyk. The light curve properties of SN 2019nyk align well…
Global Coronal Magnetic Field Estimation Using Bayesian Inference
Upasna Baweja, Vaibhav Pant, Iñigo Arregui
Estimating the magnetic field strength in the solar corona is crucial for understanding different physical processes happening over diverse spatio-temporal scales. However, the hig…
Differential Rotation of the Solar Chromosphere using multidecadal Ca II K Spectroheliograms
Dibya Kirti Mishra, Srinjana Routh, Bibhuti Kumar Jha +2
The study of the differential rotation in the chromosphere of the Sun is of significant importance as it provides valuable insights into the rotational behaviour of the solar atmos…
Recent observations of peculiar Gamma-ray bursts using 3.6 m Devasthal Optical Telescope (DOT)
Rahul Gupta, S. B. Pandey, Amit K. Ror +2
India has been actively involved in the follow-up observations of optical afterglows of gamma-ray bursts (GRBs) for more than two decades, using the country's meter-class facilitie…