An observational signature of evolved oceans on extra-solar terrestrial planets

Details An observational signature of evolved oceans on extra-solar terrestrial planets An observational signature of evolved oceans on extra-solar terrestrial planets

2004-02-25

arxiv.org/abs/astro-ph/0402584v1

Astrophys.J. 605 (2004) L65-L68

Astronomy and Astrophysics

Astrophysics

10 pages, 2 figures, accepted by ApJ Letters

Scientific paper

10.1086/386549

The increase in luminosity with time of a main sequence star eventually can lead to substantial evaporation of the oceans on an orbiting terrestrial planet. Subsequently, the gas phase water in the planet's upper atmosphere can be photodissociated by stellar ultraviolet and the resulting atomic hydrogen then may be lost in a wind. This gaseous envelope may pass in front of the host star and produce tansient, detectable ultraviolet absorption in the Lyman lines in systems older than 1 Gyr.

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