preprints.org > physical sciences > astronomy and astrophysics > doi: 10.3390/sci1020047

Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 28 June 2019 / Approved: 10 July 2019 / Online: 15 July 2019 (00:00:00 CEST)
Version 2 : Received: 28 June 2019 / Approved: 10 July 2019 / Online: 9 August 2019 (00:00:00 CEST)
Version 3 : Received: 28 June 2019 / Approved: 10 July 2019 / Online: 19 October 2019 (00:00:00 CEST)

Both macro and microprojectiles (e.g., interplanetary, interstellar and even intergalactic material)
are seen as important vehicles for the exchange of potential (bio)material within our solar system as well
as between stellar systems in our Galaxy. Accordingly, this requires estimates of the impact probabilities
for different source populations of projectiles, including for intergalactic meteor particles which have
received relatively little attention since considered as rare events (discrete occurrences that are statistically
improbable due to their very infrequent appearance). We employ the simple but yet comprehensive
model of intergalactic microprojectile capture by the gravity of exoplanets which enables us to estimate
the map of collisional probabilities for an available sample of exoplanets in habitable zones around host
stars. The model includes a dynamical description of the capture adopted from Mautner model of
interstellar exchange of microparticles and changed for our purposes. We use statistical and information
metrics to calculate probability map of intergalactic meteorite particle capture. Moreover, by calculating
the entropy index map we measure the concentration of these rare events. We further adopted a model
from immigration theory, to show that the transient distribution of birth/death/immigration of material
for the simplest case has a high value.

intergalactic meteor particle; extrasolar planets; astrobiology

Physical Sciences, Astronomy and Astrophysics

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