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

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

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..713..227j&link_type=abstract

THE SEARCH FOR OTHER WORLDS: Fourteenth Astrophysics Conference. AIP Conference Proceedings, Volume 713, pp. 227-231 (2004).

Astronomy and Astrophysics

Astrophysics

1

Substellar Companions, Planets

Scientific paper

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.

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