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On the potentially dramatic history of the super-Earth {rho} 55 Cancri e (2015)

Hansen, B. M. S., Zink, J.

Oxford University Press

In: Monthly Notices of the Royal Astronomical Society

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Publication Date: 2015-05-24

Description: We demonstrate that tidal evolution of the inner planet (‘e’) of the system orbiting the star 55 Cancri could have led to passage through two secular resonances with other planets in the system. The consequence of this evolution is excitation of both the planetary eccentricity and inclination relative to the original orbital plane. The large mass ratio between the innermost planet and the others means that these excitations can be of substantial amplitude and can have dramatic consequences for the system organization. Such evolution can potentially explain the large observed mutual inclination between the innermost and outermost planets in the system, and implies that tidal heating could have substantially modified the structure of planet e, and possibly reduced its mass by Roche lobe overflow. Similar inner secular resonances may be found in many multiple planet systems and suggest that many of the innermost planets in these systems could have suffered similar evolutions.

Print ISSN: 0035-8711

Electronic ISSN: 1365-2966

Topics: Physics

Published by Oxford University Press

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The runaway instability in general relativistic accretion discs (2013)

Korobkin, O., Abdikamalov, E., Stergioulas, N., Schnetter, E., Zink, B., Rosswog, S., Ott, C. D.

Oxford University Press

In: Monthly Notices of the Royal Astronomical Society

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Publication Date: 2013-04-03

Description: When an accretion disc falls prey to the runaway instability, a large portion of its mass is devoured by the black hole within a few dynamical times. Despite decades of effort, it is still unclear under what conditions such an instability can occur. The technically most advanced relativistic simulations to date were unable to find a clear sign for the onset of the instability. In this work, we present three-dimensional relativistic hydrodynamics simulations of accretion discs around black holes in dynamical space–time. We focus on the configurations that are expected to be particularly prone to the development of this instability. We demonstrate, for the first time, that the fully self-consistent general relativistic evolution does indeed produce a runaway instability.

Print ISSN: 0035-8711

Electronic ISSN: 1365-2966

Topics: Physics