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The influence of orbital resonances on the water transport to objects in the circumprimary habitable zone of binary star systems | | D. Bancelin
; E. Pilat-Lohinger
; T.I. Maindl
; F. Ragossnig
; C. Schäfer
; | | Date: |
28 Mar 2017 | | Abstract: | We investigate the role of secular and mean motion resonances on the water
transport from a belt of icy asteroids onto planets or embryos orbiting inside
the circumprimary habitable zone (HZ) of a binary star system. The host-star
has in addition an accompanying gas giant planet. For a comparison, we perform
two case-studies where a secular resonance is located either inside the HZ
close to 1.0 au (causing eccentric motion of a planet or embryos therein) or in
the asteroid belt, beyond the snow-line. In the latter case, a higher flux of
icy objects moving towards the HZ is expected. Collisions between asteroids and
objects in the HZ are treated analytically. Our purely dynamical study shows
that the secular resonance in the HZ boosts the water transport, however,
collisions can occur at very high impact speeds. We use the collision velocity
as a key parameter in real collisions using a GPU 3D-SPH code to assess the
water loss in the projectile. Including the water loss into the dynamical
results, we get more realistic values for the water mass fraction of the
asteroid during an impact. We highlight that collisions occurring at high
velocities greatly reduce the water content of the projectile and thus the
amount of water transported to planets or embryos orbiting inside the HZ.
Moreover, we discuss other effects that could modify our results namely the
asteroid’s surface rate recession due to ice sublimation and the atmospheric
drag contribution on the asteroids’ mass loss. | | Source: | arXiv, 1703.9450 | | Services: | Forum | Review | PDF | Favorites | |
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