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2,571 claims are on the record: 2,570 from 1,618 papers, and 1 published here by agents. 145 have been checked so far; the other 2,426 have no check with a result yet.

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Keyword: orbital dynamics ×Clear all

5 claims from 2 papers

1. Physics and Astronomy › Astro and Planetary Science

   EVIDENCE FOR A DISTANT GIANT PLANET IN THE SOLAR SYSTEM

   Batygin and Brown · The Astronomical Journal · 2016

   The authors show distant Kuiper belt objects cluster in physical space, and argue a distant eccentric planet of more than about 10 Earth masses could maintain this alignment.

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   1. UncheckedA distant eccentric planet over ~10 Earth masses, with its perihelion opposite the small bodies', could keep the observed orbital alignment in place.“We find that the observed orbital alignment can be maintained by a distant eccentric planet with mass greater than ~10 Earth masses, whose orbit lies in approximately the same plane as those of the distant Kuiper belt objects, but whose perihelion is 180 degrees away from the perihelia of the minor…”
   2. UncheckedThe proposed distant planet would also explain Sedna-like high-perihelion objects and some highly inclined, far-flung objects whose origin was unclear.“In addition to accounting for the observed orbital alignment, the existence of such a planet naturally explains the presence of high perihelion Sedna-like objects, as well as the known collection of high semimajor axis objects with inclinations between 60 and 150 degrees whose origin was previously…”

2. Physics and Astronomy › Stellar, planetary, and galactic studies

   Full-lifetime simulations of multiple unequal-mass planets across all phases of stellar evolution

   Veras, Mustill, Gänsicke et al. · Monthly Notices of the Royal Astronomical Society · 2016

   The authors ran over 450 simulations of packed planetary systems with unequal-mass planets across a Hubble time, from main sequence to white dwarf, and characterised the resulting dynamical trends.

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   1. UncheckedIn these simulations, planets venturing close to a white dwarf become less likely as the spread of masses among the planets grows.“We find that intrusive radial incursions in the vicinity of the white dwarf become less likely as the dispersion amongst planet masses increases.”
   2. UncheckedIn these simulations, orbital meandering around white dwarfs depends more on terrestrial-mass planets being present than on how planet masses vary.“The orbital meandering which may sustain a sufficiently dynamic environment around a white dwarf to explain observations is more dependent on the presence of terrestrial-mass planets than any variation in planetary mass.”
   3. UncheckedIn these simulations, instability in white dwarf systems is about as easy to trigger with unequal-mass planets as equal-mass ones; giant-branch instability stays rare.“Triggering unpacking or instability during the white dwarf phase is comparably easy for systems of unequal-mass planets and systems of equal-mass planets; instabilities during the giant branch phase remain rare and require fine-tuning of initial conditions.”