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Physical and Dynamical Processes in Post-Main-Sequence Planetary Systems
Physical and Dynamical Processes in Post-Main-Sequence Planetary Systems
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151449
- ISBN
- 9798382842721
- DDC
- 523
- 서명/저자
- Physical and Dynamical Processes in Post-Main-Sequence Planetary Systems
- 발행사항
- [Sl] : Cornell University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 292 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
- 주기사항
- Advisor: Lai, Dong.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2024.
- 초록/해제
- 요약It has long been recognized that post-main-sequence stellar evolution and stellar death have dramatic effects on a planetary system, whether by swallowing and incinerating nearby planets or by provoking dynamical reorganization of orbital architectures. In recent years, direct observations of planetary systems around post-MS stars have demonstrated these processes in action. In this dissertation, I study several aspects of post-MS planetary evolution, using simplified physical models to address various puzzles posed by these observations and provide predictions for recent and forthcoming observations. Numerous topics within theoretical astrophysics intersect in this work, including celestial mechanics, fluid dynamics, planet formation, radiative processes, and stellar structure and evolution. Chapters 2, 3, and 4 pertain to phenomenon of white dwarf (WD) pollution, which provides indirect evidence for the existence of planets around the remnants of Sun-like and intermediate-mass stars. In Chapter 2, I study the orbital circularization of a planetesimal passing close to a WD on an eccentric orbit, in order to understand the history of two polluted WD systems containing surviving asteroids on short-period orbits. In Chapter 3, I consider a dynamical process known as secular chaos that may operate in WD systems, in order to explain the longstanding puzzle of how WD pollution is sustained on timescales of several Gyr. In Chapter 4, I examine the evolution of extrasolar Oort clouds (large-scale comet reservoirs) around WDs, to account for the curious absence of volatile-enriched polluted WDs. Chapters 5 and 6, meanwhile, are dedicated to the extraordinary object WD 1856+534 b, a Jupiter-sized planet orbiting a WD with a period of just 1.4 days, and the effort to understand its origin on both theoretical and observational bases. In Chapter 5, I demonstrate that the object could have undergone high-eccentricity tidal migration via the Lidov-Kozai effect, due to gravitational interactions with its known stellar companions. In Chapter 6, I explore an alternative scenario in which the object was engulfed by its red-giant host star and survived by facilitating the expulsion of the stellar envelope, a process known as common-envelope evolution, using the Modules for Experiments in Stellar Astrophysics software instrument. Because planet engulfment is a natural consequence of stellar evolution, in this chapter I also study the potential observational signatures of ongoing engulfment events in the Galaxy. In Chapter 7, I summarize my results and briefly describe ongoing and future work.
- 일반주제명
- Astrophysics
- 일반주제명
- Astronomy
- 일반주제명
- Planetology
- 키워드
- Exoplanets
- 키워드
- Red giants
- 키워드
- White dwarfs
- 기타저자
- Cornell University Astronomy and Space Sciences
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151449
■006m o d
■007cr#unu||||||||
■020 ▼a9798382842721
■035 ▼a(MiAaPQ)AAI31296617
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aO'Connor, Christopher Evan.▼0(orcid)0000-0003-3987-3776
■24510▼aPhysical and Dynamical Processes in Post-Main-Sequence Planetary Systems
■260 ▼a[Sl]▼bCornell University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a292 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-12, Section: B.
■500 ▼aAdvisor: Lai, Dong.
■5021 ▼aThesis (Ph.D.)--Cornell University, 2024.
■520 ▼aIt has long been recognized that post-main-sequence stellar evolution and stellar death have dramatic effects on a planetary system, whether by swallowing and incinerating nearby planets or by provoking dynamical reorganization of orbital architectures. In recent years, direct observations of planetary systems around post-MS stars have demonstrated these processes in action. In this dissertation, I study several aspects of post-MS planetary evolution, using simplified physical models to address various puzzles posed by these observations and provide predictions for recent and forthcoming observations. Numerous topics within theoretical astrophysics intersect in this work, including celestial mechanics, fluid dynamics, planet formation, radiative processes, and stellar structure and evolution. Chapters 2, 3, and 4 pertain to phenomenon of white dwarf (WD) pollution, which provides indirect evidence for the existence of planets around the remnants of Sun-like and intermediate-mass stars. In Chapter 2, I study the orbital circularization of a planetesimal passing close to a WD on an eccentric orbit, in order to understand the history of two polluted WD systems containing surviving asteroids on short-period orbits. In Chapter 3, I consider a dynamical process known as secular chaos that may operate in WD systems, in order to explain the longstanding puzzle of how WD pollution is sustained on timescales of several Gyr. In Chapter 4, I examine the evolution of extrasolar Oort clouds (large-scale comet reservoirs) around WDs, to account for the curious absence of volatile-enriched polluted WDs. Chapters 5 and 6, meanwhile, are dedicated to the extraordinary object WD 1856+534 b, a Jupiter-sized planet orbiting a WD with a period of just 1.4 days, and the effort to understand its origin on both theoretical and observational bases. In Chapter 5, I demonstrate that the object could have undergone high-eccentricity tidal migration via the Lidov-Kozai effect, due to gravitational interactions with its known stellar companions. In Chapter 6, I explore an alternative scenario in which the object was engulfed by its red-giant host star and survived by facilitating the expulsion of the stellar envelope, a process known as common-envelope evolution, using the Modules for Experiments in Stellar Astrophysics software instrument. Because planet engulfment is a natural consequence of stellar evolution, in this chapter I also study the potential observational signatures of ongoing engulfment events in the Galaxy. In Chapter 7, I summarize my results and briefly describe ongoing and future work.
■590 ▼aSchool code: 0058.
■650 4▼aAstrophysics
■650 4▼aAstronomy
■650 4▼aPlanetology
■653 ▼aCelestial mechanics
■653 ▼aExoplanets
■653 ▼aRed giants
■653 ▼aStar-planet interactions
■653 ▼aWhite dwarfs
■690 ▼a0596
■690 ▼a0606
■690 ▼a0590
■71020▼aCornell University▼bAstronomy and Space Sciences.
■7730 ▼tDissertations Abstracts International▼g85-12B.
■790 ▼a0058
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161814▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
