Document Detail

Chaotic exchange of solid material between planetary systems: implications for lithopanspermia.
MedLine Citation:
PMID:  22897115     Owner:  NLM     Status:  MEDLINE    
We examined a low-energy mechanism for the transfer of meteoroids between two planetary systems embedded in a star cluster using quasi-parabolic orbits of minimal energy. Using Monte Carlo simulations, we found that the exchange of meteoroids could have been significantly more efficient than previously estimated. Our study is relevant to astrobiology, as it addresses whether life on Earth could have been transferred to other planetary systems in the Solar System's birth cluster and whether life on Earth could have been transferred from beyond the Solar System. In the Solar System, the timescale over which solid material was delivered to the region from where it could be transferred via this mechanism likely extended to several hundred million years (as indicated by the 3.8-4.0 Ga epoch of the Late Heavy Bombardment). This timescale could have overlapped with the lifetime of the Solar birth cluster (∼100-500 Myr). Therefore, we conclude that lithopanspermia is an open possibility if life had an early start. Adopting parameters from the minimum mass solar nebula, considering a range of planetesimal size distributions derived from observations of asteroids and Kuiper Belt objects and theoretical coagulation models, and taking into account Oort Cloud formation models, we discerned that the expected number of bodies with mass>10 kg that could have been transferred between the Sun and its nearest cluster neighbor could be of the order of 10(14) to 3·10(16), with transfer timescales of tens of millions of years. We estimate that of the order of 3·10(8)·l (km) could potentially be life-bearing, where l is the depth of Earth's crust in kilometers that was ejected as the result of the early bombardment.
Edward Belbruno; Amaya Moro-Martín; Renu Malhotra; Dmitry Savransky
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Publication Detail:
Type:  Journal Article     Date:  2012-08-16
Journal Detail:
Title:  Astrobiology     Volume:  12     ISSN:  1557-8070     ISO Abbreviation:  Astrobiology     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-09-13     Completed Date:  2013-01-24     Revised Date:  2013-08-12    
Medline Journal Info:
Nlm Unique ID:  101088083     Medline TA:  Astrobiology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  754-74     Citation Subset:  IM    
Courant Institute of Mathematical Sciences, New York University, New York, New York, USA.
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MeSH Terms
Astronomical Phenomena
Exobiology / methods*
Extraterrestrial Environment
Models, Theoretical*
Monte Carlo Method
Solar System

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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