Abstract
Recent radial velocity and transit data discovered ∼100 planets in binary or triple stellar systems out of the entire population of a few thousand known planets. Stellar companions are expected to strongly influence both the formation and the dynamical evolution of planets in multiple star systems. Here, we explore the possibility that planets in triples are formed as a consequence of the dynamical interactions of binaries in star clusters. Our simulations show that the probability of forming a planet-hosting triple as a consequence of a single binary-binary scattering is in the range 0.5−3 per cent, when one of the binaries hosts a planet. Along with other formation scenarios, binary-binary encounters are a viable way of creating planet-hosting triple systems. The recently launched TESS satellite is expected to find a larger sample of planets in triple systems, and to shed light on their origin.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 648-653 |
| Number of pages | 6 |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Volume | 483 |
| Issue number | 1 |
| DOIs | |
| State | Published - Feb 11 2019 |
Funding
This research was supported in part by an ISF and an iCore grant, as well as a grant from the Breakthrough Foundation. GF is supported by the Foreign Postdoctoral Fellowship Program of the Israel Academy of Sciences and Humanities. GF also acknowledges support from an Arskin postdoctoral fellowship and Lady Davis Fellowship Trust at the Hebrew University of Jerusalem. GF acknowledges hospitality by the Institute for Theory and Computation at the Harvard-Smithsonian Center for Astrophysics, where the early plan for this work was conceived. Simulations were performed on the Astric cluster at the Hebrew University of Jerusalem.
Keywords
- Galaxies: star clusters: general
- Galaxy: kinematics and dynamics
- Planets and satellites: detection
- Planets and satellites: general
- Stars: kinematics and dynamics
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science