2018MNRAS.480.3595S


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST08:12:10

2018MNRAS.480.3595S - Mon. Not. R. Astron. Soc., 480, 3595-3608 (2018/November-1)

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

SCHWARZ R., BAZSO A., GEORGAKARAKOS N., LOIBNEGGER B., MAINDL T.I., BANCELIN D., PILAT-LOHINGER E., KISLYAKOVA K.G., DVORAK R. and DOBBS-DIXON I.

Abstract (from CDS):

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 Earth masses). 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.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): methods: numerical - celestial mechanics - comets: general - binaries: general - planetary systems

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 10180 * 01 37 53.5773715933 -60 30 41.485438420   7.95 7.32     G1V 162 2
2 HD 21620 EB* 03 31 29.3397170443 +49 12 35.180260731 6.390 6.350 6.280     A0Vn 61 0
3 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1505 1
4 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1704 1
5 HD 42111 * 06 08 57.9039737933 +02 29 58.887793999 5.86 5.80 5.73     B9V 117 0
6 * rho Vir dS* 12 41 53.0567802922 +10 14 08.229084878 5.00 4.97 4.88 4.80 4.78 A0Va_lB 212 0
7 NAME Proxima Centauri Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1028 0
8 NAME Proxima Centauri b Pl 14 29 42.9451234609 -62 40 46.170818907           ~ 247 0
9 NAME Proxima Centauri c Pl? 14 29 42.9451234609 -62 40 46.170818907           ~ 9 0
10 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 850 0
11 HD 145964 * 16 14 28.8830612483 -21 06 27.490846733   6.407 6.405     B9V 74 0
12 HIP 85605 * 17 29 36.2779418268 +24 39 11.011474589   12.17 11.03 10.685   ~ 21 0
13 TRAPPIST-1 LM* 23 06 29.3684052886 -05 02 29.031690445     18.798 16.466 14.024 M7.5e 581 0

    Equat.    Gal    SGal    Ecl

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2021.04.15-08:12:10

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