서브메뉴
검색
Exploring the Early-Time Evolution of Rare and Extreme Supernovae with Las Cumbres Observatory- [electronic resource]
Exploring the Early-Time Evolution of Rare and Extreme Supernovae with Las Cumbres Observatory- [electronic resource]
상세정보
- 자료유형
- 학위논문파일 국외
- 최종처리일시
- 20240214101220
- ISBN
- 9798380157773
- DDC
- 523
- 서명/저자
- Exploring the Early-Time Evolution of Rare and Extreme Supernovae with Las Cumbres Observatory - [electronic resource]
- 발행사항
- [S.l.]: : University of California, Santa Barbara., 2023
- 발행사항
- Ann Arbor : : ProQuest Dissertations & Theses,, 2023
- 형태사항
- 1 online resource(207 p.)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-02, Section: B.
- 주기사항
- Advisor: Howell, D. Andrew;Bildsten, Lars.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Santa Barbara, 2023.
- 사용제한주기
- This item must not be sold to any third party vendors.
- 초록/해제
- 요약The advent of wide-field surveys has led to an exponential increase in the number of supernovae discovered each year. As the sample sizes of these objects have grown, we have discovered supernovae that show greater diversity within their spectroscopic classes than expected, as well as objects that do not fit into traditional classification schemes altogether. Studying these ``extreme" supernovae in greater detail is crucial to understanding the poorly-understood end stages of stars' lives; early-time observations within hours of the supernova explosion probe the progenitor star's stellar structure as well as its circumstellar environment, which can be used to test current theories of stellar evolution. Here I present studies utilizing photometric and spectroscopic observations, primarily taken by Las Cumbres Observatory, of supernovae that occupy poorly-understood or unpopulated regions of parameter space. First, I examine an object with extreme ejecta velocities. Observations of this Type Ia supernova, SN 2019ein, within days of explosion show some of the fastest-moving ejecta of any supernova. The potential sources of this high-velocity ejecta in the context of the poorly-understood progenitor channels and explosion mechanisms of Type Ia supernovae are explored. Next, I investigate the powering mechanisms and progenitor systems of supernovae with rapidly-evolving luminosities. High-cadence observations of objects within this region of supernova phase space reveal significant diversity in their circumstellar environments and powering mechanisms. In particular, I show evidence connecting luminous, rapidly-evolving unclassified transients with supernovae powered by interaction with circumstellar material. I also present the first sample study of a new class of supernovae, Type Icn supernovae, with rapidly-evolving light curves powered by interaction with circumstellar material that is both hydrogen- and helium-poor. Studying these unique and rare objects reveals that some are likely the explosions of stars less massive than expected from our current understanding of mass-loss in massive stars. Finally, I present evidence of diversity in the powering mechanisms and progenitors of the well-understood class of Type IIb supernovae. Each of these major findings challenges our understanding of supernova physics as well as theories of mass loss during the final stages of stellar evolution.
- 일반주제명
- Astrophysics.
- 일반주제명
- Physics.
- 일반주제명
- Astronomy.
- 키워드
- Supernovae
- 기타저자
- University of California, Santa Barbara Physics
- 기본자료저록
- Dissertations Abstracts International. 85-02B.
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008240612s2023 us |||||||||||||||c||eng d■001000016933225
■00520240214101220
■006m o d
■007cr#unu||||||||
■020 ▼a9798380157773
■035 ▼a(MiAaPQ)AAI30526269
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aPellegrino, Craig M.
■24510▼aExploring the Early-Time Evolution of Rare and Extreme Supernovae with Las Cumbres Observatory▼h[electronic resource]
■260 ▼a[S.l.]:▼bUniversity of California, Santa Barbara. ▼c2023
■260 1▼aAnn Arbor :▼bProQuest Dissertations & Theses, ▼c2023
■300 ▼a1 online resource(207 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-02, Section: B.
■500 ▼aAdvisor: Howell, D. Andrew;Bildsten, Lars.
■5021 ▼aThesis (Ph.D.)--University of California, Santa Barbara, 2023.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aThe advent of wide-field surveys has led to an exponential increase in the number of supernovae discovered each year. As the sample sizes of these objects have grown, we have discovered supernovae that show greater diversity within their spectroscopic classes than expected, as well as objects that do not fit into traditional classification schemes altogether. Studying these ``extreme" supernovae in greater detail is crucial to understanding the poorly-understood end stages of stars' lives; early-time observations within hours of the supernova explosion probe the progenitor star's stellar structure as well as its circumstellar environment, which can be used to test current theories of stellar evolution. Here I present studies utilizing photometric and spectroscopic observations, primarily taken by Las Cumbres Observatory, of supernovae that occupy poorly-understood or unpopulated regions of parameter space. First, I examine an object with extreme ejecta velocities. Observations of this Type Ia supernova, SN 2019ein, within days of explosion show some of the fastest-moving ejecta of any supernova. The potential sources of this high-velocity ejecta in the context of the poorly-understood progenitor channels and explosion mechanisms of Type Ia supernovae are explored. Next, I investigate the powering mechanisms and progenitor systems of supernovae with rapidly-evolving luminosities. High-cadence observations of objects within this region of supernova phase space reveal significant diversity in their circumstellar environments and powering mechanisms. In particular, I show evidence connecting luminous, rapidly-evolving unclassified transients with supernovae powered by interaction with circumstellar material. I also present the first sample study of a new class of supernovae, Type Icn supernovae, with rapidly-evolving light curves powered by interaction with circumstellar material that is both hydrogen- and helium-poor. Studying these unique and rare objects reveals that some are likely the explosions of stars less massive than expected from our current understanding of mass-loss in massive stars. Finally, I present evidence of diversity in the powering mechanisms and progenitors of the well-understood class of Type IIb supernovae. Each of these major findings challenges our understanding of supernova physics as well as theories of mass loss during the final stages of stellar evolution.
■590 ▼aSchool code: 0035.
■650 4▼aAstrophysics.
■650 4▼aPhysics.
■650 4▼aAstronomy.
■653 ▼aSupernovae
■653 ▼aLas Cumbres Observatory
■653 ▼aEjecta velocities
■653 ▼aType Ia supernovae
■690 ▼a0596
■690 ▼a0605
■690 ▼a0606
■71020▼aUniversity of California, Santa Barbara▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g85-02B.
■773 ▼tDissertation Abstract International
■790 ▼a0035
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16933225▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
