Exo-Earths: Earth-mass planets in exoplanetary systems

Jones, Barrie W. (2003). Exo-Earths: Earth-mass planets in exoplanetary systems. Astronomy & Geophysics, 44(2) 2.10-2.14.

DOI: https://doi.org/10.1046/j.1468-4004.2003.44210.x

Abstract

So far, all the known exoplanets are considerably more massive than the Earth. The absence of Earth-mass planets could be due largely to observational selection effects that discriminate against low mass. Orbital studies of putative Earth-mass planets in the habitable zones of known exoplanetary systems have shown that in a reasonable proportion of these systems there are stable orbits with semimajor axes that remain confined to the habitable zone. Whether the Earth-mass planets could have formed in these habitable zones is a question that needs further study.

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