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DYNAMICAL EVOLUTION OF MULTI-ORBITER SYSTEMS: APPLICATIONS TO PLANETS, PROTOPLANETARY DISKS, AND BLACK HOLES

dc.contributor.authorLi, Jiaru
dc.contributor.chairLai, Dongen_US
dc.contributor.committeeMemberBattaglia, Nicholasen_US
dc.contributor.committeeMemberNicholson, Philipen_US
dc.contributor.committeeMemberStacey, Gordonen_US
dc.date.accessioned2024-04-05T18:47:05Z
dc.date.available2024-04-05T18:47:05Z
dc.date.issued2023-08
dc.description297 pagesen_US
dc.description.abstractSystems with massive central objects and multiple smaller orbiters appear in many astrophysical contexts. Their dynamical evolution cannot be described by analytic solutions with finite numbers of terms except for some special cases. In this dissertation, I use semi-analytical methods, N-body simulations, and hydrodynamics simulations to study the dynamical evolution in different kinds of multi-orbiter scenarios: (i) I investigate the outcomes of dynamical instability in planetary systems. I incorporate hydrodynamics effects during planet-planet close encounters into long-term numerical integration, and present the resulting distributions of planetary orbital eccentricities, spins, and obliquities. (ii) I show that, under certain conditions, self-gravitating protoplanetary disks around stars may be prone to a new hydrodynamical instability called eccentric mode instability (EMI). This instability causes disks to develop coherent eccentric patterns spontaneously. I then examine a new way to form rings in disks via EMI, and find a new mechanism to produce highly eccentric exoplanets through a secular resonance between planets and eccentric disks. (iii) I explore the dynamics of stellar-mass black holes (BHs) embedded in gaseous accretion disks around supermassive BHs. I show that these embedded BHs may form long-lived binaries through close encounters due to either gravitational wave emission or gas drag.en_US
dc.identifier.doihttps://doi.org/10.7298/ph95-5t12
dc.identifier.otherLi_cornellgrad_0058F_13693
dc.identifier.otherhttp://dissertations.umi.com/cornellgrad:13693
dc.identifier.urihttps://hdl.handle.net/1813/114679
dc.language.isoen
dc.rightsAttribution 4.0 International*
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/*
dc.subjectastrophysicsen_US
dc.subjectblack holesen_US
dc.subjectexoplanetsen_US
dc.subjectgravitational wave sourcesen_US
dc.subjecthydrodynamicsen_US
dc.subjectprotoplanetary disksen_US
dc.titleDYNAMICAL EVOLUTION OF MULTI-ORBITER SYSTEMS: APPLICATIONS TO PLANETS, PROTOPLANETARY DISKS, AND BLACK HOLESen_US
dc.typedissertation or thesisen_US
dcterms.licensehttps://hdl.handle.net/1813/59810.2
thesis.degree.disciplineAstronomy and Space Sciences
thesis.degree.grantorCornell University
thesis.degree.levelDoctor of Philosophy
thesis.degree.namePh. D., Astronomy and Space Sciences

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