Tidal Decay of Circumbinary Planetary Systems

Research output

1 Citation (Scopus)

Abstract

It is shown that circumbinary planetary systems are subject to universal tidal decay (shrinkage of orbits), caused by the forced orbital eccentricity inherent to them. Circumbinary planets (CBPs) are liberated from parent systems when, owing to the shrinkage, they enter the circumbinary chaotic zone. On shorter timescales (less than the current age of the universe), the effect may explain, at least partially, the observed lack of CBPs of close-enough (with periods <5 days) stellar binaries; on longer timescales (greater than the age of the universe but well within stellar lifetimes), it may provide massive liberation of chemically evolved CBPs. Observational signatures of the effect may comprise (1) a prevalence of large rocky planets (super-Earths) in the whole population of rogue planets (if this mechanism were the only source of rogue planets); (2) a mass-dependent paucity of CBPs in systems of low-mass binaries: the lower the stellar mass, the greater the paucity.

Original languageEnglish
Article number52
JournalAstronomical Journal
Volume156
Issue number2
DOIs
Publication statusPublished - 1 Aug 2018

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planetary systems
planets
planet
hypothetical planets
decay
shrinkage
universe
stellar mass
eccentricity
timescale
signatures
orbits
orbitals
life (durability)

Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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title = "Tidal Decay of Circumbinary Planetary Systems",
abstract = "It is shown that circumbinary planetary systems are subject to universal tidal decay (shrinkage of orbits), caused by the forced orbital eccentricity inherent to them. Circumbinary planets (CBPs) are liberated from parent systems when, owing to the shrinkage, they enter the circumbinary chaotic zone. On shorter timescales (less than the current age of the universe), the effect may explain, at least partially, the observed lack of CBPs of close-enough (with periods <5 days) stellar binaries; on longer timescales (greater than the age of the universe but well within stellar lifetimes), it may provide massive liberation of chemically evolved CBPs. Observational signatures of the effect may comprise (1) a prevalence of large rocky planets (super-Earths) in the whole population of rogue planets (if this mechanism were the only source of rogue planets); (2) a mass-dependent paucity of CBPs in systems of low-mass binaries: the lower the stellar mass, the greater the paucity.",
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Tidal Decay of Circumbinary Planetary Systems. / Shevchenko, Ivan I.

In: Astronomical Journal, Vol. 156, No. 2, 52, 01.08.2018.

Research output

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T1 - Tidal Decay of Circumbinary Planetary Systems

AU - Shevchenko, Ivan I.

PY - 2018/8/1

Y1 - 2018/8/1

N2 - It is shown that circumbinary planetary systems are subject to universal tidal decay (shrinkage of orbits), caused by the forced orbital eccentricity inherent to them. Circumbinary planets (CBPs) are liberated from parent systems when, owing to the shrinkage, they enter the circumbinary chaotic zone. On shorter timescales (less than the current age of the universe), the effect may explain, at least partially, the observed lack of CBPs of close-enough (with periods <5 days) stellar binaries; on longer timescales (greater than the age of the universe but well within stellar lifetimes), it may provide massive liberation of chemically evolved CBPs. Observational signatures of the effect may comprise (1) a prevalence of large rocky planets (super-Earths) in the whole population of rogue planets (if this mechanism were the only source of rogue planets); (2) a mass-dependent paucity of CBPs in systems of low-mass binaries: the lower the stellar mass, the greater the paucity.

AB - It is shown that circumbinary planetary systems are subject to universal tidal decay (shrinkage of orbits), caused by the forced orbital eccentricity inherent to them. Circumbinary planets (CBPs) are liberated from parent systems when, owing to the shrinkage, they enter the circumbinary chaotic zone. On shorter timescales (less than the current age of the universe), the effect may explain, at least partially, the observed lack of CBPs of close-enough (with periods <5 days) stellar binaries; on longer timescales (greater than the age of the universe but well within stellar lifetimes), it may provide massive liberation of chemically evolved CBPs. Observational signatures of the effect may comprise (1) a prevalence of large rocky planets (super-Earths) in the whole population of rogue planets (if this mechanism were the only source of rogue planets); (2) a mass-dependent paucity of CBPs in systems of low-mass binaries: the lower the stellar mass, the greater the paucity.

KW - astrobiology

KW - binaries: close

KW - planetary systems

KW - planets and satellites: general

KW - stars: individual (EZ Aqr)

KW - stars: low-mass

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