Fast litho-panspermia in the habitable zone of the TRAPPIST-1 system
With several short-period, Earth-mass planets in the habitable zone, the TRAPPIST-1 system potentially allows litho-panspermia to take place on very short timescales. We investigate the efficiency and speed of inter-planetary material transfer resulting from impacts onto the habitable zone planets....
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| creator | Krijt, Sebastiaan Bowling, Timothy J Lyons, Richard J Ciesla, Fred J |
| description | With several short-period, Earth-mass planets in the habitable zone, the TRAPPIST-1 system potentially allows litho-panspermia to take place on very short timescales. We investigate the efficiency and speed of inter-planetary material transfer resulting from impacts onto the habitable zone planets. By simulating trajectories of impact ejecta from their moment of ejection until (re-)accretion, we find that transport between the habitable zone planets is fastest for ejection velocities around and just above planetary escape velocity. At these ejection velocities, \({\sim}10\%\) of the ejected material reaches another habitable zone planet within \(10^2\mathrm{~yr}\), indicating litho-panspermia can be 4 to 5 orders of magnitude faster in TRAPPIST-1 than in the Solar System. |
| doi_str_mv | 10.48550/arxiv.1704.01411 |
| format | Article |
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| subjects | Circumstellar habitable zone Deposition Ejecta Escape velocity Extrasolar planets Panspermia Physics - Earth and Planetary Astrophysics Solar system |
| title | Fast litho-panspermia in the habitable zone of the TRAPPIST-1 system |
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