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Prospects for 'Earths' in the Habitable Zones of Known Exoplanetary Systems

Jones, Barrie W.; Underwood, David R. and Sleep, P. Nick (2004). Prospects for 'Earths' in the Habitable Zones of Known Exoplanetary Systems. In: 14th Annual Astrophysics Conference, 13-14 October 2003, University of Maryland, MD, USA, p. 227.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1063/1.1774529
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Abstract

We have shown that Earth-mass planets could survive in variously restricted regions of the habitable zones (HZs) of most of a sample of nine of the 104 main-sequence exoplanetary systems confirmed by mid-November 2003. In a preliminary extrapolation of our results to the other systems, we estimate that roughly a half of these systems could have had an Earth-mass planet confined to the HZ for at least the most recent 1000 Ma. The HZ migrates outwards during the main-sequence lifetime, and so this proportion varies with stellar age — about two thirds of the systems could have such a planet confined to the HZ for at least 1000 Ma at sometime during the main-sequence lifetime. Clearly, these systems should be targeted for exploration for terrestrial planets. We have reached this conclusion by launching putative Earth-mass planets in various orbits and following their fate with mixed-variable symplectic and hybrid integrators. Whether the Earth-mass planets could form in the HZs of the exoplanetary systems is an urgent question that needs further study.

Item Type: Conference Item
Copyright Holders: 2004 American Institute of Physics
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 18947
Depositing User: Colin Smith
Date Deposited: 19 Nov 2009 15:08
Last Modified: 02 Dec 2010 20:41
URI: http://oro.open.ac.uk/id/eprint/18947
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