자료유형  

 학위논문

Control Number  

0016932497

International Standard Book Number  

9798380314817

Dewey Decimal Classification Number  

520

Main Entry-Personal Name  

Li, Jiaru.

Publication, Distribution, etc. (Imprint  

[S.l.] : Cornell University., 2023

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2023

Physical Description  

1 online resource(298 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-03, Section: B.

General Note  

Advisor: Lai, Dong.

Dissertation Note  

Thesis (Ph.D.)--Cornell University, 2023.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약Systems 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.

Subject Added Entry-Topical Term  

Astronomy.

Subject Added Entry-Topical Term  

Astrophysics.

Subject Added Entry-Topical Term  

Planetology.

Index Term-Uncontrolled  

Black holes

Index Term-Uncontrolled  

Exoplanets

Index Term-Uncontrolled  

Gravitational wave sources

Index Term-Uncontrolled  

Hydrodynamics

Index Term-Uncontrolled  

Protoplanetary disks

Added Entry-Corporate Name  

Cornell University Astronomy and Space Sciences

Host Item Entry  

Dissertations Abstracts International. 85-03B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:642972