2021A&A...647A.136P


Query : 2021A&A...647A.136P

2021A&A...647A.136P - Astronomy and Astrophysics, volume 647A, 136-136 (2021/3-1)

Oort cloud Ecology. I. Extra-solar Oort clouds and the origin of asteroidal interlopers.

PORTEGIES ZWART S.

Abstract (from CDS):

We simulate the formation and evolution of Oort clouds around the 200 nearest stars (within ∼16 pc according to the Gaia DR2) database. This study is performed by numerically integrating the planets and minor bodies in orbit around the parent star and in the Galactic potential. The calculations start 1Gyr ago and continue for 100 Myr into the future. In this time frame, we simulate how asteroids (and planets) are ejected from the vicinity of the stars and settle in an Oort cloud and how they escape the local stellar gravity to form tidal streams. A fraction of 0.0098 to 0.026 of the asteroids remain bound to their parent star. The orbits of these asteroids isotropize and circularize because of the influence of the Galactic tidal field and eventually form an Oort cloud between ∼104 and ∼2x105au. We estimate that ≤6% of the nearby stars may have a planet in their Oort cloud. The majority of asteroids (and some of the planets) become unbound from their parent star to become free floating in the Galactic potential. These interstellar asteroids remain in a similar orbit around the Galactic center to their host star, forming dense streams of rogue interstellar asteroids and planets. The Solar System occasionally passes through such tidal streams, potentially giving rise to occasional close encounters with objects in this stream. Two recently discovered sources, 1I/(2017 Q3) 'Oumuamua and 2I/(2019 Q4) Borisov, may be such objects. Although the direction from which an individual object originated cannot easily be traced back to the original host, multiple such objects coming from the same source might help to identify their origin. Currently, the Solar System is in the bow or wake of the tidal stream of approximately ten of the nearby stars, which might contribute considerably to the interaction rate. Overall, we estimate that the local density of such leftovers from the planet-formation process contributes to a local density of 1.2x1014 per pc–3, or ≥0.1 of the interstellar visitors originate from the obliterated debris disks of such nearby stars.

Abstract Copyright: © ESO 2021

Journal keyword(s): Oort Cloud - stars: general - galaxies: ISM - methods: numerical

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* GX And Er* 00 18 22.8849799680 +44 01 22.637951588   10.120   7.3   M2V 511 0
2 * e Eri PM* 03 19 55.6509122226 -43 04 11.215188426 5.20 4.98 4.27 3.65 3.25 G6V 428 1
3 HD 21749 PM* 03 26 59.2226447548 -63 29 56.762928961 10.446 9.302 8.143 7.43 6.865 K4.5V 99 1
4 * eps Eri BY* 03 32 55.8444911587 -09 27 29.739493865 5.19 4.61 3.73 3.00 2.54 K2V 1837 1
5 V* SZ UMa Er* 11 20 04.8264516310 +65 50 47.349400374 13.24 12.16   8.4   M2V 168 0
6 HD 103095 Pe* 11 52 58.7673387755 +37 43 07.254113125 7.38 7.20 6.45 5.80 5.35 K1V_Fe-1.5 776 1
7 * p Cen * 12 50 41.1633885768 -33 59 57.652650456   4.863 4.894     B9V 48 0
8 BD+11 2576 PM* 13 29 59.7858994351 +10 22 37.784532575 11.728 10.524 9.029 8.07 7.013 M1.0V 235 0
9 NAME Serpens Dwarf GlC 15 16 05.30 -00 06 41.0   15.1       ~ 701 1
10 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13437 0
11 NAME Barnard's star BY* 17 57 48.4984700685 +04 41 36.113879676 12.497 11.24 9.511 8.298 6.741 M4V 764 2
12 HD 172051 ** 18 38 53.4010594968 -21 03 06.750986472   6.518 5.860     G6V 191 1
13 HD 180617 PM* 19 16 55.2565688720 +05 10 08.040554168 11.768 10.63 9.115 8.076 6.782 M3-V 396 0
14 HD 346704 * 20 31 40.3045397642 +24 28 23.067919293   11.09 10.59     G0 4 0
15 * eta Cep PM* 20 45 17.3755540 +61 50 19.616737 4.960 4.320 3.410 2.76 2.27 K0IV 432 0
16 * 61 Cyg A BY* 21 06 53.9395895022 +38 44 57.902349973 7.50 6.39 5.21 4.19 3.54 K5V 1005 0
17 * 61 Cyg ** 21 06 53.95 +38 44 57.9           ~ 172 0
18 * 61 Cyg B Er* 21 06 55.2638444466 +38 44 31.358519864 8.63 7.40 6.03 4.86 3.55 K7V 702 1
19 BD-15 6290 BY* 22 53 16.7325836486 -14 15 49.304052185 12.928 11.749 10.192 9.013 7.462 M3.5V 955 1

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2023.02.01-06:47:54

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