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Perturbation of the Oort Cloud by Close Stellar Encounter with Gliese 710

Tesink, R. Perturbation of the Oort Cloud by Close Stellar Encounter with Gliese 710. Bachelor's Thesis, Astronomy.


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Context: Our Sun is thought to have an Oort cloud, a spherically symmetric shell of roughly 10^11 comets orbiting with semi major axes between ∼ 5 × 10^3 AU and 1 × 10^5 AU. It is thought to be possible that other stars also possess comet clouds. Gliese 710 is a star expected to have a close encounter with the Sun in 1.35 Myrs. Aims: To simulate the comet clouds around the Sun and Gliese 710 and investigate the effect of the close encounter. Method: Two REBOUND N-body simulations were used with the help of Gaia DR2 data. Simulation 1 had a total integration time of 4 Myr, a time-step of 1 yr, and 10,000 comets in each comet cloud. And Simulation 2 had a total integration time of 80,000 yr, a time-step of 0.01 yr, and 100,000 comets in each comet cloud. Results: Simulation 2 revealed a 1.7% increase in the semi-major axis at time of closest approach and a population loss of 0.019% - 0.117% for the Oort cloud. There was no statistically significant net change of the inclination of the comets during this encounter and a 0.14% increase in the eccentricity at the time of closest approach

Item Type: Thesis (Bachelor's Thesis)
Supervisor name: Frantseva, K. and Oberg, N.O.
Degree programme: Astronomy
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 08 Aug 2019 10:38
Last Modified: 08 Aug 2019 10:38

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