2011A&A...532A.120L


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.20CEST08:16:25

2011A&A...532A.120L - Astronomy and Astrophysics, volume 532A, 120-120 (2011/8-1)

Stripping a debris disk by close stellar encounters in an open stellar cluster.

LESTRADE J.-F., MOREY E., LASSUS A. and PHOU N.

Abstract (from CDS):

A debris disk is a constituent of any planetary system surrounding a main sequence star. We study whether close stellar encounters can disrupt and strip a debris disk of its planetesimals in the expanding open cluster of its birth with a decreasing star number density over 100Myr. Such stripping would affect the dust production and hence detectability of the disk. We tabulated the fractions of planetesimals stripped off during stellar flybys of miss distances between 100 and 1000AU and for several mass ratios of the central to passing stars. We then estimated the numbers of close stellar encounters over the lifetime of several expanding open clusters characterized by their initial star densities. We found that a standard disk, with inner and outer radii of 40 and 100AU, suffers no loss of planetesimals over 100 Myr around a star born in a common embedded cluster with star density ≤1000/pc3. In contrast, we found that such a disk is severely depleted of its planetesimals around a star born in an Orion-type cluster where the star density is >20000/pc3. In this environment, a disk loses >97% of its planetesimals around an M-dwarf, >63% around a solar-type star, and >42% around an A-dwarf, over 100Myr. We roughly estimate that two-thirds of the stars may be born in such high star density clusters. This might explain in part why fewer debris disks are observed around lower mass stars.

Abstract Copyright:

Journal keyword(s): circumstellar matter - Kuiper belt: general

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2884 0
2 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1885 1
3 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1422 1
4 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1585 1
5 NGC 2632 OpC 08 40 24 +19 40.0   3.46 3.1     ~ 1161 0
6 NAME Upper Sco Association As* 16 12 -23.4           ~ 935 1
7 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 10856 0
8 V* AU Mic BY* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 860 0

    Equat.    Gal    SGal    Ecl

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2019.07.20-08:16:25

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