Interaction of free-floating planets with a star–planet pair

Varvoglis, H.; Sgardeli, Vasiliki; Tsiganis, K.

doi:10.1007/s10569-012-9429-8

Cited by 38 publications

(16 citation statements)

References 16 publications

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“…The resulting capture probability is P = 48.57%. one presented by Varvoglis et al (2012), implying the consistency of the method. Additionally, a variety of b, φ B grid values with specific outcomes were selected from the map and tested individually to assure that the final energy values do not vary, and that the trajectories of the bodies agree with the outcomes.…”

Section: Resultsmentioning

confidence: 65%

Capture of free-floating planets by planetary systems

Ribak

2017

Monthly Notices of the Royal Astronomical Society

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Evidence of exoplanets with orbits that are misaligned with the spin of the host star may suggest that not all bound planets were born in the protoplanetary disk of their current planetary system. Observations have shown that free-floating Jupiter-mass objects can exceed the number of stars in our galaxy, implying that capture scenarios may not be so rare. To address this issue, we construct a three-dimensional simulation of a three-body scattering between a free-floating planet and a star accompanied by a Jupiter-mass bound planet. We distinguish between three different possible scattering outcomes, where the free-floating planet may get captured after the interaction with the binary, remain unbound, or "kick-out" the bound planet and replace it. The simulation was performed for different masses of the free-floating planets and stars, as well as different impact parameters, inclination angles and approach velocities. The outcome statistics are used to construct an analytical approximation of the cross section for capturing a free-floating planet by fitting their dependence on the tested variables. The analytically approximated cross section is used to predict the capture rate for these kinds of objects, and to estimate that about 1% of all stars are expected to experience a temporary capture of a free-floating planet during their lifetime. Finally, we propose additional physical processes that may increase the capture statistics and whose contribution should be considered in future simulations.

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Section: Resultsmentioning

confidence: 65%

Capture of free-floating planets by planetary systems

Ribak

2017

Monthly Notices of the Royal Astronomical Society

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“…Such close separations are unlikely to host objects in central configurations because any bodies so close to those stars would either be drawn in and destroyed due to tides, or blown away by winds. For particularly wide separations, comparable to where stellar flybys or planet-planet scattering might deposit planets or planetary debris into an exosystem (Perets & Kouwenhoven 2012;Varvoglis et al 2012), capture into a central configuration is a distinct possibility.…”

Section: Discussionmentioning

confidence: 99%

Relating binary-star planetary systems to central configurations

Veras

2016

Mon. Not. R. Astron. Soc.

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Binary-star exoplanetary systems are now known to be common, for both wide and close binaries. However, their orbital evolution is generally unsolvable. Special cases of the N -body problem which are in fact completely solvable include dynamical architectures known as central configurations. Here, I utilize recent advances in our knowledge of central configurations to assess the plausibility of linking them to coplanar exoplanetary binary systems. By simply restricting constituent masses to be within stellar or substellar ranges characteristic of planetary systems, I find that (i) this constraint reduces by over 90 per cent the phase space in which central configurations may occur, (ii) both equal-mass and unequal-mass binary stars admit central configurations, (iii) these configurations effectively represent different geometrical extensions of the SunJupiter-Trojan-like architecture, (iv) deviations from these geometries are no greater than ten degrees, and (v) the deviation increases as the substellar masses increase. This study may help restrict future stability analyses to architectures which resemble exoplanetary systems, and might hint at where observers may discover dust, asteroids and/or planets in binary star systems.

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“…Also, given the possible vast population of free‐floating giant planets (Sumi et al ), passing giant planets might be more common than passing stars. Then, the resulting binary–single interactions with a passing free‐floater and a planetary system could become important (Varvoglis, Sgardeli & Tsiganis ). If a giant free‐floating planet of mass M p were to pass by a system with a planet of mass M p orbiting a star of mass M s , then the critical velocity of this configuration is

\sqrt{(2 δ + 1) / (2 + δ)} \approx 71

per cent of the critical velocity of the traditional stellar fly‐by binary–single scattering configuration.…”

Section: Discussionmentioning

confidence: 99%

Disrupting primordial planet signatures: the close encounter of two single-planet exosystems in the Galactic disc

Veras

Moeckel

2012

Monthly Notices of the Royal Astronomical Society

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During their main‐sequence lifetimes, the majority of all Galactic disc field stars must endure at least one stellar intruder passing within a few hundred au. Mounting observations of planet–star separations near or beyond this distance suggest that these close encounters may fundamentally shape currently observed orbital architectures and hence obscure primordial orbital features. We consider the commonly occurring fast close encounters of two single‐planet systems in the Galactic disc, and investigate the resulting change in the planetary eccentricity and semimajor axis. We derive explicit four‐body analytical limits for these variations and present numerical cross‐sections which can be applied to localized regions of the Galaxy. We find that each wide‐orbit planet has a few per cent chance of escape and an eccentricity that will typically change by at least 0.1 due to these encounters. The orbital properties established at formation of millions of tight‐orbit Milky Way exoplanets are likely to be disrupted.

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Interaction of free-floating planets with a star–planet pair

Cited by 38 publications

References 16 publications

Capture of free-floating planets by planetary systems

Capture of free-floating planets by planetary systems

Relating binary-star planetary systems to central configurations

Disrupting primordial planet signatures: the close encounter of two single-planet exosystems in the Galactic disc

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