The mean energy transfer rate to comets in the Oort cloud and implications for cometary origins

Interstellar comet
DOI: 10.1093/mnras/218.1.1 Publication Date: 2014-07-20T16:13:17Z
ABSTRACT
The mean energy transfer rate to comets in the Oort Cloud is calculated including both stellar and giant molecular cloud perturbations. For representative values of parameters clouds dominate evolution for semi-major axes |$\text{a}\gtrsim2\times{10}^{4}$|AU, while stars if |$\text{a}\lesssim2\times{10}^{4}$|AU. resulting unbinding time-scales half-lives are compared with results Bahcall et al. Hut & Tremaine. Good agreement their formulae obtained although there slight differences detailed parameters. Taking together we estimates critical axis a1/2, beyond which majority primordial removed during age solar system, order 104AU. implications this work existence hypothetical companion star Nemesis suggests that its present form idea should be rejected. Finally origins considered. A solution equation a massive inner core every comet now outer |$(\text{a}\gtrsim2\times{10}^{4}$|AU) roughly 100 would required initially Uranus–Neptune zone proto-planetary disc. This indicates long-period may not have originated part Solar Nebula, it argued instead Nebula models more readily generate sufficiently investigated. disruption by cumulative effects perturbations over System consistent interstellar capture hypothesis, but places tight constraints on models.
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