Chaotic exchange of solid material between planetary systems: implications for lithopanspermia.

Edward Belbruno, Amaya Moro-Martín, Renu Malhotra, Dmitry Savransky

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)754-774
Number of pages21
JournalAstrobiology
Volume12
Issue number8
StatePublished - Aug 2012
Externally publishedYes

Fingerprint

planetary systems
Solar System
solar system
Meteoroids
meteoroids
timescale
bombardment
orbits
energy
coagulation
Oort cloud
exobiology
Kuiper belt
asteroid belts
solar nebula
Exobiology
Earth crust
protoplanets
planetesimal
Minor Planets

ASJC Scopus subject areas

  • Space and Planetary Science
  • Agricultural and Biological Sciences (miscellaneous)

Cite this

Chaotic exchange of solid material between planetary systems : implications for lithopanspermia. / Belbruno, Edward; Moro-Martín, Amaya; Malhotra, Renu; Savransky, Dmitry.

In: Astrobiology, Vol. 12, No. 8, 08.2012, p. 754-774.

Research output: Contribution to journalArticle

Belbruno, E, Moro-Martín, A, Malhotra, R & Savransky, D 2012, 'Chaotic exchange of solid material between planetary systems: implications for lithopanspermia.', Astrobiology, vol. 12, no. 8, pp. 754-774.
Belbruno, Edward ; Moro-Martín, Amaya ; Malhotra, Renu ; Savransky, Dmitry. / Chaotic exchange of solid material between planetary systems : implications for lithopanspermia. In: Astrobiology. 2012 ; Vol. 12, No. 8. pp. 754-774.
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