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Prompt emission from tidal disruptions of white dwarfs by intermediate mass black holes

Shcherbakov, R. V. and Pe'er, A. and Reynolds, C. S. and Haas, R. and Bode, T. and Laguna, P. (2012) Prompt emission from tidal disruptions of white dwarfs by intermediate mass black holes. EPJ Web of Conferences, 39 . Art. No. 02007. ISSN 2100-014X. http://resolver.caltech.edu/CaltechAUTHORS:20130307-144400385

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1051/epjconf/20123902007DOIArticle
https://arxiv.org/abs/1212.5267arXivDiscussion Paper
Additional Information:© 2012 Owned by the authors, published by EDP Sciences. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Published online 18 December 2012. The work is partially supported by NASA Hubble Fellowship grant HST-HF-51298.01.
Group:TAPIR
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Funding AgencyGrant Number
NASA Hubble FellowshipHST-HF-51298.01
Record Number:CaltechAUTHORS:20130307-144400385
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130307-144400385
Official Citation:Prompt emission from tidal disruptions of white dwarfs by intermediate mass black holes. R.V. Shcherbakov, A. Pe’er, C.S. Reynolds, R. Haas, T. Bode and P. Laguna. EPJ Web of Conferences, 39 (2012) 02007. DOI: https://doi.org/10.1051/epjconf/20123902007
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37389
Collection:CaltechAUTHORS
Deposited By: JoAnn Boyd
Deposited On:27 Mar 2013 18:36
Last Modified:12 Dec 2018 17:41

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