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The scenario and efficiency of water transport by icy asteroids and cometsare still amongst the most important unresolved questions of planetary systems.A better understanding of cometary dynamics in extrasolar systems shall provideinformation about cometary reservoirs and give an insight into water transportespecially to planets in the habitable zone. The detection of ProximaCentauri-b (PCb), which moves in the habitable zone of this system, triggered adebate whether or not this planet can be habitable. In this work, we focus onthe stability of an additional planet in the system and on water transport byminor bodies. We perform numerous N-body simulations with PCb and an outerOort-cloud like reservoir of comets. We investigate close encounters andcollisions with the planet, which are important for the transport of water.Observers found hints for a second planet with a period longer than 60 days.Our dynamical studies show that two planets in this system are stable even fora more massive second planet (~12 Earth masses). Furthermore, we performsimulations including exocomets, a second planet, and the influence of thebinary Alpha Centauri. The studies on the dynamics of exocomets reveal that theouter limit for water transport is around 200 au. In addition we show thatwater transport would be possible from a close-in planetesimal cloud (1-4 au).From our simulations, based on typical M-star protoplanetary disks, we estimatethe water mass delivered to the planets up to 51 Earth oceans.

Exocomets in the Proxima Centauri system and their importance for water transport