Planets in triple star systems--the case of HD188753

Abstract

We consider the formation of the recently discovered ``hot Jupiter'' planet orbiting the primary component of the triple star system HD188753. Although the current outer orbit of the triple is too tight for a Jupiter-like planet to have formed and migrated to its current location, the binary may have been much wider in the past. We assume here that the planetary system formed in an open star cluster, the dynamical evolution of which subsequently led to changes in the system's orbital parameters and binary configuration. We calculate cross sections for various scenarios that could have led to the multiple system currently observed, and conclude that component A of HD188753 with its planet were most likely formed in isolation to be swapped in a triple star system by a dynamical encounter in an open star cluster. We estimate that within 500pc of the Sun there are about 1200 planetary systems which, like Hd188753, have orbital parameters unfavorable for forming planets but still having a planet, making it quite possible that the HD188753 system was indeed formed by a dynamical encounter in an open star cluster.

arXiv commentApJ Letters in press

References in corpus (14)

• Models of Giant Planet formation with migration and disc evolution
• Astrophysical parameters of Galactic open clusters
• SB9: The Ninth Catalogue of Spectroscopic Binary Orbits
• Star cluster ecology IVa: Dissection of an open star cluster---photometry
• Stellar Collisions During Binary-Binary and Binary-Single Star Interactions
• On the Snow Line in Dusty Protoplanetary Disks
• Circumstellar and Circumbinary Disks in Eccentric Stellar Binaries
• The Primordial Binary Population - I: A near-infrared adaptive optics search for close visual companions to A star members of Scorpius OB2
• Secular Evolution of Hierarchical Planetary Systems
• Planet formation is unlikely in equal mass binary systems with a ~ 50 AU
• 109 new Galactic open clusters
• The Effect of Encounters on the Eccentricity of Binaries in Clusters
• Binary--single-star scattering VI. Automatic Determination of Interaction Cross Sections
• An alternative look at the snowline in protoplanetary disks

Cited by in corpus (23)

• Origins of Eccentric Extrasolar Planets: Testing the Planet-Planet Scattering Model
• Close encounters in young stellar clusters: implications for planetary systems in the solar neighbourhood
• Dynamical Interactions of Planetary Systems in Dense Stellar Environments
• Planet Formation in Binary Stars: The case of Gamma Cephei
• Impact of Stellar Dynamics on the Frequency of Giant Planets in Close Binaries
• The instability of planetary systems in binaries: how the Kozai mechanism leads to strong planet-planet interactions
• Disk Truncation and Planet Formation in gamma Cephei
• The dynamical fate of planetary systems in young star clusters
• Cluster Origin of Triple Star HD 188753 and its Planet
• Constraints on the Formation of the Planet Around HD188753A
• Detection and Characterization of Planets in Binary and Multiple Systems
• No evidence of a hot Jupiter around HD 188753 A
• Precise radial velocities of giant stars IX. HD 59686 Ab: a massive circumstellar planet orbiting a giant star in a ~13.6 au eccentric binary system
• A debris disk under the influence of a wide planetary mass companion: The system of HD106906
• Limits to Tertiary Astrometric Companions in Binary Systems
• The conjectured S-type retrograde planet in nu Octantis: more evidence including four years of iodine-cell radial velocities
• The Stability and Dynamics of Planets in Tight Binary Systems
• Stellar scattering and the origin of the planet around gamma-cephei-A
• Astrophysics in 2006
• An Early Catalog of Planet Hosting Multiple Star Systems of Order Three and Higher
• A dynamical origin for planets in triple star systems
• Probing the Impact of Stellar Duplicity on Planet Occurrence with Spectroscopic and Imaging Observations
• Is our Sun a Singleton?