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

R. Schwarz, Bazsó, N. Georgakarakos, B. Loibnegger, T. I. Maindl, D. Bancelin, E. Pilat-Lohinger, K. G. Kislyakova, R. Dvorak, Ian Dobbs-Dixon

Research output: Contribution to journalArticle

Abstract

The scenario and efficiency of water transport by icy asteroids and comets are still amongst the most important unresolved questions of planetary systems. A better understanding of cometary dynamics in extrasolar systems shall provide information about cometary reservoirs and give an insight into water transport especially to planets in the habitable zone. The detection of Proxima Centauri b (PCb), which moves in the habitable zone of this system, triggered a debate whether or not this planet can be habitable. In this work, we focus on the stability of an additional planet in the system and on water transport by minor bodies. We perform numerous N-body simulations with PCb and an outer Oort cloud-like reservoir of comets. We investigate close encounters and collisions with the planet, which are important for the transport of water. Observers found hints for a second planet with a period longer than 60 d. Our dynamical studies show that two planets in this system are stable even for a more massive second planet (~12 Earthmasses). Furthermore, we perform simulations including exocomets, a second planet, and the influence of the binary Alpha Centauri. The studies on the dynamics of exocomets reveal that the outer limit for water transport is around 200 au. In addition, we show that water transport would be possible from a close-in planetesimal cloud (1-4 au). From our simulations, based on typical M-star protoplanetary discs, we estimate the water mass delivered to the planets to be between the extremes 0 and 51 Earth oceans.

Original languageEnglish (US)
Pages (from-to)3595-3608
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume480
Issue number3
DOIs
StatePublished - Jan 1 2018

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planets
planet
water
comets
comet
Oort cloud
simulation
M stars
protoplanetary disks
protoplanets
planetary systems
planetesimal
asteroids
encounters
asteroid
water mass
oceans
collision
collisions
ocean

Keywords

  • Binaries: general
  • Celestial mechanics
  • Comets: general
  • Methods: numerical
  • Planetary systems

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Exocomets in the Proxima Centauri system and their importance for water transport. / Schwarz, R.; Bazsó; Georgakarakos, N.; Loibnegger, B.; Maindl, T. I.; Bancelin, D.; Pilat-Lohinger, E.; Kislyakova, K. G.; Dvorak, R.; Dobbs-Dixon, Ian.

In: Monthly Notices of the Royal Astronomical Society, Vol. 480, No. 3, 01.01.2018, p. 3595-3608.

Research output: Contribution to journalArticle

Schwarz, R, Bazsó, Georgakarakos, N, Loibnegger, B, Maindl, TI, Bancelin, D, Pilat-Lohinger, E, Kislyakova, KG, Dvorak, R & Dobbs-Dixon, I 2018, 'Exocomets in the Proxima Centauri system and their importance for water transport', Monthly Notices of the Royal Astronomical Society, vol. 480, no. 3, pp. 3595-3608. https://doi.org/10.1093/MNRAS/STY2064
Schwarz R, Bazsó, Georgakarakos N, Loibnegger B, Maindl TI, Bancelin D et al. Exocomets in the Proxima Centauri system and their importance for water transport. Monthly Notices of the Royal Astronomical Society. 2018 Jan 1;480(3):3595-3608. https://doi.org/10.1093/MNRAS/STY2064
Schwarz, R. ; Bazsó ; Georgakarakos, N. ; Loibnegger, B. ; Maindl, T. I. ; Bancelin, D. ; Pilat-Lohinger, E. ; Kislyakova, K. G. ; Dvorak, R. ; Dobbs-Dixon, Ian. / Exocomets in the Proxima Centauri system and their importance for water transport. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 480, No. 3. pp. 3595-3608.
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