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[ref id: 299] Topic: Type Iax SUPERNOVAE: A new sub-class of type 1a Supernovae

Speaker: Pankaj Sanwal
Affiliation: ARIES Auditorium
Date (yyyy-mm-dd): 2017-12-14
Time: 11:30hr
Venue: ARIES Auditorium

Abstract: Type Iax supernovae (SNe Iax) are proposed as one new sub-class of SNe Ia since they present observational properties that are sufficiently distinct from the bulk of SNe Ia. SNe Iax are the most common of all types of peculiar SNe by both number and rate, with an estimated rate of occurrence of about 5%–30% of the total SN Ia rate. The progenitor system and explosion model that best fits all of the data is a binary system of a C/O WD that accretes matter from a He star and has a deflagration. At least some of the time, this explosion will not disrupt the WD. However, the progenitor systems of SNe Iax are still uncertain.

About Speaker: SRF at ARIES

[ref id: 298] Topic: Study of Magnetized Accretion Flow With Relativistic Equation of State

Speaker: Kuldeep Singh
Affiliation: ARIES
Date (yyyy-mm-dd): 2017-12-14
Time: 15:30hr
Venue: Aries Auditorium

Abstract: We study magnetized accretion shock flows using the relativistic equation of state having variable adiabatic index (Γ). We include bremsstrahlung and cyclotron cooling for the neutron star which has very strong dipole-like magnetic field and is aligned with the rotation axis of the star. We find all possible accretion solutions. All accretion solutions terminate with a shock very near to the star surface and the height of this primary shock does not vary considerably either with the spin period or the Bernoulli parameter of the flow, although the strength of the shock may vary with the period. For moderately rotating central star there is a possible formation of multiple sonic points in the flow and there a second shock far away from the surface of the star. We find that if the rotation period is less than a certain value, then multiple critical points or internal shocks are not possible, but this value depends upon the composition of the flow. We also find that cooling effect dominates after the shock and for consistent accretion solutions cyclotron cooling should be present along with the bremsstrahlung cooling.

About Speaker: SRF at ARIES