21 citations · 70 across the 13 of their papers we have counts for
14 papers
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…
Dynamic Photometric Variability in Three Young Brown Dwarfs in Taurus: Detection of Optical Flares with TESS data
Samrat Ghosh, Soumen Mondal, Somnath Dutta +4
We present -band time-series photometric variability studies of three known nearby ( 140 pc) and young ( 1 Myr) brown dwarfs (BD) in the Taurus star-forming region…
Starspot distribution and flare events in two young low-mass stars using TESS data
Rajib Kumbhakar, Soumen Mondal, Samrat Ghosh +1
Wide-field high-precision photometric observations such as \textit{Transiting Exoplanet Survey Satellite (TESS)} allowed the investigation of the stellar magnetic activity of cool…
Probing properties of nearly two-hundred new active galactic nuclei
Samrat Ghosh, Samir Mandal, Sudip Bhattacharyya +1
We present a comprehensive analysis of the X-ray spectral properties of 198 newly identified active galactic nuclei (AGNs), leveraging archival data from the {\it Chandra} X-ray Ob…
Photometric Variability of Low Mass Stars and Brown Dwarfs in IC~348 and Taurus Star-Forming Regions
Samrat Ghosh, Soumen Mondal, Santosh Joshi +2
Low-mass stars belonging to the M spectral type are the most numerous stars in our Galaxy, amounting to about two-thirds in number, and are found at the bottom of the main sequence…
Rotational Variability and Detection of Superflares in a Young Brown Dwarf by TESS
Rajib Kumbhakar, Soumen Mondal, Samrat Ghosh +2
We present a comprehensive analysis of a Transiting Exoplanet Survey Satellite (TESS) high-quality light curve for a young brown dwarf, MHO~4 having spectral type M7.0, in the Taur…
Baryonic Tully-Fisher test of Grumiller's modified gravity model
Samrat Ghosh, Arunava Bhadra, Amitabha Mukhopadhyay +1
We test the Grumiller's quantum motivated modified gravity model, which at large distances modifies the Newtonian potential and describes the galactic rotation curves of disk galax…
Fast Photometric Variability of Very Low Mass Stars in IC 348: Detection of Superflare in an M-dwarf
Samrat Ghosh, Soumen Mondal, Somnath Dutta +5
We present here optical I-band photometric variability study down to 19 mag of a young (2-3 Myr) star-forming region IC 348 in the Perseus molecular cloud. We aim to…
Morphology and ionization characteristics of planetary nebulae PB 1 and PC 19
Rahul Bandyopadhyay, Ramkrishna Das, Soumen Mondal +1
We present results of our study of two planetary nebulae (PNe), PB1 and PC 19. We use the optical spectra of these two PNe observed at 2 m Himalayan Chandra Telescope and also arch…
Understanding Physical Properties of Young M-dwarfs: NIR spectroscopic studies
Dhrimadri Khata, Soumen Mondal, Ramkrishna Das +2
We present here medium resolution (λ/Δλ\sim1200) H- and K-band spectra of M type dwarf stars covering the wavelength range 1.50 - 1.80 μm and 1.95 - 2.45 μm. The sample includes 53…
Probing dark matter and dark energy through Gravitational Time Advancement
Samrat Ghosh, Arunava Bhadra, Amitabha Mukhopadhyay
The expression of gravitational time advancement (negative time delay) for particles with non-zero mass in Schwarzschild geometry has been obtained. The influences of the gravitati…
Gravitational lensing study of cold dark matter led galactic halo
Samrat Ghosh, Arunava Bhadra, Amitabha Mukhopadhyay
In this work the space-time geometry of the halo region in spiral galaxies is obtained considering the observed flat galactic rotation curve feature, invoking the Tully-Fisher rela…
The young cluster NGC 2282 : a multi-wavelength perspective
Somnath Dutta, S. Mondal, J. Jose +3
We present the analysis of the stellar content of NGC~2282, a young cluster in the Monoceros constellation, using deep optical and IPHAS photometry along with infrared (IR) d…
Influences of Dark Energy and dark matter on Gravitational Time Advancement
Samrat Ghosh, Arunava Bhadra
The effect of dark matter/energy on gravitational time advancement (negative effective time delay) has been investigated considering few dark energy/matter models including cosmolo…