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Nucleosynthesis in the outflows associated with accretion disks of Type II collapsars
Indrani Banerjee, Banibrata Mukhopadhyay
We investigate nucleosynthesis inside the outflows from gamma-ray burst (GRB) accretion disks formed by the Type II collapsars. In these collapsars, massive stars undergo core coll…
Establishing a relation between mass and spin of stellar mass black holes
Indrani Banerjee, Banibrata Mukhopadhyay
Stellar mass black holes (SMBHs), forming by the core collapse of very massive, rapidly rotating stars, are expected to exhibit a high density accretion disk around them developed…
Magnetohydrodynamic stability of stochastically driven accretion flows
Sujit K. Nath, Banibrata Mukhopadhyay, Amit K. Chattopadhyay
We investigate the evolution of magnetohydrodynamic/hydromagnetic perturbations in the presence of stochastic noise in rotating shear flows. The particular emphasis is the flows wh…
Nucleosynthesis in the accretion disks of Type II collapsars
Indrani Banerjee, Banibrata Mukhopadhyay
We investigate nucleosynthesis inside the gamma-ray burst (GRB) accretion disks formed by the Type II collapsars. In these collapsars, the core collapse of massive stars first lead…
New mass limit of white dwarfs
Upasana Das, Banibrata Mukhopadhyay
Is the Chandrasekhar mass limit for white dwarfs (WDs) set in stone? Not anymore -- recent observations of over-luminous, peculiar type Ia supernovae can be explained if significan…
Revisiting some physics issues related to the new mass limit for magnetized white dwarfs
Upasana Das, Banibrata Mukhopadhyay
We clarify important physics issues related to the recently established new mass limit for magnetized white dwarfs which is significantly super-Chandrasekhar. The issues include, j…
A possible evolutionary scenario of highly magnetized super-Chandrasekhar white dwarfs: progenitors of peculiar type Ia supernovae
Upasana Das, Banibrata Mukhopadhyay, A. R. Rao
Several recently discovered peculiar type Ia supernovae seem to demand an altogether new formation theory that might help explain the puzzling dissimilarities between them and the…
Strongly magnetized electron degenerate gas: Highly super-Chandrasekhar white dwarfs
Upasana Das, Banibrata Mukhopadhyay
We consider a relativistic, degenerate, electron gas under the influence of a strong magnetic field, which describes magnetized white dwarfs. Landau quantization changes the densit…
Constraining the central magnetic field of magnetars
Banibrata Mukhopadhyay, Monika Sinha
The magnetars are believed to be highly magnetized neutron stars having surface magnetic field 10^{14} - 10^{15} G. It is believed that at the center, the magnetic field may be hig…
Model of a disk-outflow coupled system: disk-outflow symbiosis
Banibrata Mukhopadhyay
Several observational evidences and deeper theoretical insights reveal that accretion and outflow/jet are strongly correlated. We model an advective disk-outflow coupled dynamics.…
Does black hole spin play a key role in the FSRQ/BL Lac dichotomy?
Banibrata Mukhopadhyay
It is believed that jets emerging from blazars (Flat Spectrum Radio Quasars (FSRQs) and BL Lacs) are almost aligned to the line-of-sight. BL Lacs usually exhibit lower luminosity a…
Nucleosynthesis in the gamma-ray burst accretion disks and associated outflows
Indrani Banerjee, Banibrata Mukhopadhyay
We investigate nucleosynthesis inside the gamma-ray burst (GRB) accretion disks formed by the Type II collapsars and outflows launched from these disks. We deal with accretion disk…
New mass limit for white dwarfs: super-Chandrasekhar type Ia supernova as a new standard candle
Upasana Das, Banibrata Mukhopadhyay
Type Ia supernovae, sparked off by exploding white dwarfs of mass close to Chandrasekhar limit, play the key role to understand the expansion rate of universe. However, recent obse…