Prompt Emission from Tidal Disruptions of White Dwarfs by Intermediate Mass Black Holes
arXiv:1212.5267 · doi:10.1051/epjconf/20123902007
Abstract
We present a qualitative picture of prompt emission from tidal disruptions of white dwarfs (WD) by intermediate mass black holes (IMBH). The smaller size of an IMBH compared to a supermassive black hole and a smaller tidal radius of a WD disruption lead to a very fast event with high peak luminosity. Magnetic field is generated in situ following the tidal disruption, which leads to effective accretion. Since large-scale magnetic field is also produced, geometrically thick super-Eddington inflow leads to a relativistic jet. The dense jet possesses a photosphere, which emits quasi-thermal radiation in soft X-rays. The source can be classified as a long low-luminosity gamma-ray burst (ll-GRB). Tidal compression of a WD causes nuclear ignition, which is observable as an accompanying supernova. We suggest that GRB060218 and SN2006aj is such a pair of ll-GRB and supernova. We argue that in a flux-limited sample the disruptions of WDs by IMBHs are more frequent then the disruptions of other stars by IMBHs.
5 pages, 1 figure, proceedings for ESA Workshop on Tidal Disruption Events and AGN Outbursts, Madrid, June 25-27, 2012
References in corpus (11)
- X-ray Properties of Black-Hole Binaries
- Formation of Supermassive Black Holes by Direct Collapse in Pregalactic Halos
- Stability of Relativistic Jets from Rotating, Accreting Black Holes via Fully Three-Dimensional Magnetohydrodynamic Simulations
- A neutron-star-driven X-ray flash associated with supernova SN 2006aj
- A new method of determining the initial size and Lorentz factor of gamma-ray burst fireballs using a thermal emission component
- A New Paradigm for Gamma Ray Bursts: Long Term Accretion Rate Modulation by an External Accretion Disk
- SN 2006aj Associated with XRF 060218 At Late Phases: Nucleosynthesis-Signature of A Neutron Star-Driven Explosion
- The photospheric radiation model for the prompt emission of Gamma-ray Bursts: Interpreting four observed correlations
- SDSS J160531.84+174826.1: A Dwarf Disk Galaxy With An Intermediate-Mass Black Hole
- The Interpretation and Implication of the Afterglow of GRB 060218
- On the Early Time X-ray Spectra of Swift Afterglows I: Evidence for Anomalous Soft X-ray Emission