How Common are Extrasolar, Late Heavy Bombardments?

Details How Common are Extrasolar, Late Heavy Bombardments? How Common are Extrasolar, Late Heavy Bombardments?

2009-11-17

arxiv.org/abs/0911.3271v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

2 pages, 1 figure. Contribution to the conference proceedings for 'Pathways towards habitable planets'

Scientific paper

The habitability of planets is strongly affected by impacts from comets and asteroids. Indications from the ages of Moon rocks suggest that the inner Solar System experienced an increased rate of impacts roughly 3.8 Gya known as the Late Heavy Bombardment (LHB). Here we develop a model of how the Solar System would have appeared to a distant observer during its history based on the Nice model of Gomes et al. (2005). We compare our results with observed debris discs. We show that the Solar System would have been amongst the brightest of these systems before the LHB. Comparison with the statistics of debris disc evolution shows that such heavy bombardment events must be rare occurring around less than 12% of Sun-like stars.

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