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  Tidal disruptions of separated binaries in galactic nuclei

Amaro-Seoane, P., Miller, M. C., & Kennedy, G. F. (2012). Tidal disruptions of separated binaries in galactic nuclei. Monthly Notices of the Royal Astronomical Society, 425, 2401-2406. doi:10.1111/j.1365-2966.2012.21162.x.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-EADE-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-EADF-C
Genre: Journal Article

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1106.1429 (Preprint), 431KB
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Amaro-Seoane, Pau1, Author              
Miller, M. Coleman, Author
Kennedy, Gareth F., Author
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24013              

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Free keywords: Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO, Astrophysics, Galaxy Astrophysics, astro-ph.GA, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 Abstract: Several galaxies have exhibited X-ray flares that are consistent with the tidal disruption of a star by a central supermassive black hole. In theoretical treatments of this process it is usually assumed that the star was initially on a nearly parabolic orbit relative to the black hole. Such an assumption leads in the simplest approximation to a $t^{-5/3}$ decay of the bolometric luminosity and this is indeed consistent with the relatively poorly sampled light curves of such flares. We point out that there is another regime in which the decay would be different: if a binary is tidally separated and the star that remains close to the hole is eventually tidally disrupted from a moderate eccentricity orbit, the decay is slower, typically $\sim t^{-1.2}$. As a result, careful sampling of the light curves of such flares could distinguish between these processes and yield insight into the dynamics of binaries as well as single stars in galactic centres. We explore this process using three-body simulations and analytic treatments and discuss the consequences for present-day X-ray detections and future gravitational wave observations.

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 Dates: 2011-06-072012-04-252012
 Publication Status: Published in print
 Pages: Accepted for publications at MNRAS
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1106.1429
DOI: 10.1111/j.1365-2966.2012.21162.x
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Publ. Info: Oxford : Blackwell Science
Pages: - Volume / Issue: 425 Sequence Number: - Start / End Page: 2401 - 2406 Identifier: ISSN: 1365-8711
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/1000000000024150