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Dynamical and Biological Panspermia Constraints Within Multiplanet Exosystems

2018; Mary Ann Liebert, Inc.; Volume: 18; Issue: 9 Linguagem: Inglês

10.1089/ast.2017.1786

1531-1074

Dimitri Veras, D. J. Armstrong, James A. Blake, José F. Gutièrrez‐Marcos, Alan P. Jackson, Hendrik Schäefer,

Geology and Paleoclimatology Research

As discoveries of multiple planets in the habitable zone of their parent star mount, developing analytical techniques to quantify extrasolar intra-system panspermia will become increasingly important. Here, we provide user-friendly prescriptions that describe the asteroid impact characteristics which would be necessary to transport life both inwards and outwards within these systems within a single framework. Our focus is on projectile generation and delivery and our expressions are algebraic, eliminating the need for the solution of differential equations. We derive a probability distribution function for life-bearing debris to reach a planetary orbit, and describe the survival of micro-organisms during planetary ejection, their journey through interplanetary space, and atmospheric entry.