A5079419825- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Superconducting Materials and Applications
- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Ocean Waves and Remote Sensing
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Neutrino Physics Research
- Nuclear Physics and Applications
- Fluid Dynamics and Turbulent Flows
- Coastal and Marine Dynamics
- Fluid Dynamics and Vibration Analysis
- Wave and Wind Energy Systems
- Nanofluid Flow and Heat Transfer
- Particle Accelerators and Free-Electron Lasers
- Fractional Differential Equations Solutions
- Crystal Structures and Properties
- Calibration and Measurement Techniques
- Catalysis and Oxidation Reactions
University of Calcutta
2009-2021
Grove City College
2014-2017
The Ohio State University
2014-2017
Calcutta Research Group
1936-1966
Medical College and Hospital, Kolkata
1930
After the All-Sky Automated Survey for SuperNovae (ASAS-SN) discovered a significant brightening of inner region NGC 2617, we began ~70 day photometric and spectroscopic monitoring campaign from X-ray through near-infrared (NIR) wavelengths. We report that 2617 went dramatic outburst, during which its flux increased by over an order magnitude followed increase optical/ultraviolet (UV) continuum almost magnitude. classified as Seyfert 1.8 galaxy in 2003, is now 1 due to appearance broad...
We present ground-based and Swift photometric spectroscopic observations of the candidate tidal disruption event (TDE) ASASSN-14li, found at center PGC 043234 ($d\simeq90$ Mpc) by All-Sky Automated Survey for SuperNovae (ASAS-SN). The source had a peak bolometric luminosity $L\simeq10^{44}$ ergs s$^{-1}$ total integrated energy $E\simeq7\times10^{50}$ radiated over $\sim6$ months presented. UV/optical emission is well-fit blackbody with roughly constant temperature $T\sim35,000$ K, while...
ASASSN-14ae is a candidate tidal disruption event (TDE) found at the center of SDSS J110840.11+340552.2 ($d\simeq200$~Mpc) by All-Sky Automated Survey for Supernovae (ASAS-SN). We present ground-based and Swift follow-up photometric spectroscopic observations source, finding that transient had peak luminosity $L\simeq8\times10^{43}$~erg~s$^{-1}$ total integrated energy $E\simeq1.7\times10^{50}$ ergs radiated over $\sim5$ months presented. The blackbody temperature remains roughly constant...
We report the discovery of ASASSN-15lh (SN 2015L), which we interpret as most luminous supernova yet found. At redshift z = 0.2326, reached an absolute magnitude M_{u,AB} -23.5+/-0.1 and bolometric luminosity L_bol (2.2+/-0.2)x 10^45 ergs s^-1, is more than twice any previously known supernova. It has several major features characteristic hydrogen-poor super-luminous supernovae (SLSNe-I), whose energy sources progenitors are currently poorly understood. In contrast to SLSNe-I that reside in...
We present ground-based and Swift photometric spectroscopic observations of the tidal disruption event (TDE) ASASSN-15oi, discovered at centre 2MASX J20390918−3045201 (d ≃ 216 Mpc) by All-Sky Automated Survey for SuperNovae. The source peaked a bolometric luminosity L 1.3 × 1044 erg s−1 radiated total energy E 6.6 1050 over first ∼3.5 months observations. early optical/UV emission can be fit blackbody with temperature increasing from T ∼ 2 104 K to 4 while declines 2.3 1043 s−1, requiring...
We present basic statistics for all supernovae discovered by the All-Sky Automated Survey SuperNovae (ASAS-SN) during its first year-and-a-half of operations, spanning 2013 and 2014. also same information other bright ($m_V\leq17$), spectroscopically confirmed from 2014 May 1 through end 2014, providing a comparison to ASAS-SN sample starting point where became operational in both hemispheres. In addition, we collected redshifts near-UV IR magnitudes, available, host galaxies samples. This...
This manuscript presents information for all supernovae discovered by the All-Sky Automated Survey SuperNovae (ASAS-SN) during 2015, its second full year of operations. The same is presented bright (mV ≤ 17), spectroscopically confirmed other sources in 2015. As with first ASAS-SN supernova catalogue, we also present redshifts and near-ultraviolet through infrared magnitudes host galaxies both samples. Combined our previous this work comprises a complete catalogue 455 from multiple...
On 2014 Dec. 9.61, the All-Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin") discovered ASASSN-14lp just $\sim2$ days after first light using a global array of 14-cm diameter telescopes. went on to become bright supernova ($V = 11.94$ mag), second only SN 2014J year. We present prediscovery photometry (with detection less than day light) and ultraviolet through near-infrared photometric spectroscopic data covering rise fall more 100 days. find that had broad curve ($\Delta...
We discuss ASASSN-13db, an EX Lupi-type ("EXor") accretion event on the young stellar object (YSO) SDSS J051011.01$-$032826.2 (hereafter SDSSJ0510) discovered by All-Sky Automated Survey for SuperNovae (ASAS-SN). Using archival photometric data of SDSSJ0510 we construct a pre-outburst spectral energy distribution (SED) and find that it is consistent with low-mass class II YSO near Orion star forming region ($d \sim 420$ pc). present follow-up spectroscopic observations source after $\Delta V...
We analyze a ΔV ∼ −9 magnitude flare on the newly identified M8 dwarf SDSS J022116.84+194020.4 (hereafter SDSSJ0221) detected as part of All-Sky Automated Survey for Supernovae. Using infrared and optical spectra, we confirm that SDSSJ0221 is relatively nearby (d 76 pc) with strong quiescent Hα emission. Based kinematics absence features consistent low-gravity (young) ultracool dwarfs, place lower limit 200 Myr age SDSSJ0221. When modeled simple, classical light curve, this total U-band...
We present the results of spectroscopic and photometric monitoring campaign ASASSN-15ed. The transient was discovered quite young by All Sky Automated Survey for SuperNovae (ASAS-SN). Amateur astronomers allowed us to sample SN evolution around maximum light, which we estimate have occurred on JD = 2457087.4 +- 0.6 in r-band. Its apparent r-band magnitude at r 16.91 0.10, providing an absolute M(r) ~ -20.04 0.20, is slightly more luminous than typical magnitudes estimated Type Ibn SNe....
Abstract A straightforward analysis involving the complex function‐theoretic method is employed to determine closed‐form solution of a special hypersingular integral equation second kind, and its known recovered.
This article examines the problem of wave propagation in a rotating random micropolar generalized thermoelastic medium. The entire frame reference is assumed to be with uniform angular velocity Ω→=Ωn→ where n→ unit vector representing direction axis rotation. smooth perturbation technique amenable stochastic differential equations has been employed. dispersion equation derived and analyzed. effects due variations elastic thermal parameters have observed. effect rotation on discussed. Change...
We present photometric and spectroscopic observations of ASASSN-13co, an unusually luminous Type II supernova the first core-collapse discovered by All-Sky Automated Survey for SuperNovae (ASAS-SN). First detection was on UT 2013 August 29 data presented span roughly 3.5 months after discovery. use recently developed model from Pejcha & Prieto (2015) to multi-band light curves ASASSN-13co derive bolometric luminosity curve. compare other supernovae show that it a exhibited atypical curve...
In this paper an attempt has been made to study the unsteady incompressible flow of a generalized Oldroyd-B fluid between two oscillating parallel plates in presence transverse magnetic field. An exact solution for velocity field obtained by means Laplace and finite Fourier sine transformations series form terms Mittage-Leffler function. The dependence on fractional as well material parameters illustrated graphically. fields classical Newtonian, Maxwell, second grade ordinary fluids are...