Cluster Origin of Triple Star HD 188753 and its Planet

Astrophysics, abstract
astro-ph/0509490

From: Eric Pfahl [view email]

Date (v1): Fri, 16 Sep 2005 09:27:32 GMT   (151kb)

Date (revised v2): Wed, 26 Oct 2005 21:32:29 GMT   (152kb)

The recent discovery by M. Konacki of a “hot Jupiter” in the hierarchical
triple star system HD 188753 challenges established theories of giant-planet
formation. If the orbital geometry of the triple has not changed since the
birth of the planet, then a disk around the planetary host star would probably
have been too compact and too hot for a Jovian planet to form by the
core-accretion model or gravitational collapse. This paradox is resolved if the
star was initially either single or had a much more distant companion. It is
suggested here that a close multi-star dynamical encounter transformed this
initial state into the observed triple, an idea that follows naturally if HD
188753 formed in a moderately dense stellar system–perhaps an open
cluster–that has since dissolved. Three distinct types of encounters are
investigated. The most robust scenario involves an initially single planetary
host star that changes places with the outlying member of a pre-existing
hierarchical triple.

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