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Titolo:
Microlensing planets in M 22: Free-floating or bound?
Autore:
Marcos, RD; Marcos, CD;
Indirizzi:
Univ Complutense Madrid, E-28040 Madrid, Spain Univ Complutense Madrid Madrid Spain E-28040 drid, E-28040 Madrid, Spain
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 379, anno: 2001,
pagine: 872 - 877
SICI:
1432-0746(200112)379:3<872:MPIM2F>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
MASSIVE DARK CLUSTERS; GLOBULAR-CLUSTERS; GALACTIC HALO; BINARIES; OBJECTS; ORBITS; EVENTS; YOUNG; M22;
Keywords:
celestial mechanics; stellar dynamics; dark matter; Galaxy : globular clusters : individual : NGC 6656; globular clusters : general; gravitational lensing; planetary systems;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Marcos, RD Univ Complutense Madrid, Ciudad Univ, E-28040 Madrid, Spain Univ Complutense Madrid Ciudad Univ Madrid Spain E-28040 Spain
Citazione:
R.D. Marcos e C.D. Marcos, "Microlensing planets in M 22: Free-floating or bound?", ASTRON ASTR, 379(3), 2001, pp. 872-877

Abstract

We use detailed numerical simulations and theoretical estimates to show that, if confirmed, the unusually brief microlensing events observed by Sahu et al. (2001) in the field of the globular cluster M 22 might be explained as a result of microlensing by a population of clustered MACHOs, a dark cluster or RAMBO, not associated with the globular cluster. If real, this darkcluster would be located between M 22 and the Galactic bulge and could include at least 10(6) substellar members with a typical size of 1-3 pc. Boundplanets in wide or/and eccentric orbits are also able to reproduce the observed microlensing behaviour, but only if multiplanet systems (including large Kuiper-belt-like objects) are abundant, although, our calculations argue against the latter scenario as the ionization rate in M 22 is very high. Dynamically ejected or lone planets are, in principle, incompatible with the observational findings as they either escape their parent cluster in a relatively short time-scale after ejection or segregate toward the outskirts of the cluster. We discuss additional implications of the dark cluster scenario, including the existence of a population of RAMBOs toward the Galacticbulge.

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Documento generato il 02/04/20 alle ore 13:02:09