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|Title:||On the structure of tidally disrupted stellar debris streams|
|Authors:||Coughlin, Eric R.|
Nixon, Chris J.
Begelman, Mitchell C.
Armitage, Philip J.
|Publisher:||Oxford University Press (OUP) on behalf of the Royal Astronomical Society|
|Citation:||Monthly Notices of the Royal Astronomical Society, 2016, 459 (3), pp. 3089-3103|
|Abstract:||A tidal disruption event (TDE) – when a star is destroyed by the immense gravitational field of a supermassive black hole – transforms a star into a stream of tidally shredded debris. The properties of this debris ultimately determine the observable signatures of tidal disruption events (TDEs). Here we derive a simple, self-similar solution for the velocity profile of the debris streams produced from TDEs, and show that this solution agrees extremely well with numerical results. Using this self-similar solution, we calculate an analytic, approximate expression for the radial density profile of the stream. We show that there is a critical adiabatic index that varies as a function of position along the stream above (below) which the stream is unstable (stable) to gravitational fragmentation. We also calculate the impact of heating and cooling on this stability criterion.|
|Rights:||This article has been accepted for publication in MNRAS. Copyright © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.|
|Description:||Deposited with reference to the publisher’s open access archiving policy.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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|MNRAS-2016-Coughlin-3089-103.pdf||Published (publisher PDF)||1.46 MB||Adobe PDF||View/Open|
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