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Chasing Metamorphic Supernovae with Zwicky Transient Facility, SEDM-KP, and AI
Chasing Metamorphic Supernovae with Zwicky Transient Facility, SEDM-KP, and AI
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104749
- ISBN
- 9798290653709
- DDC
- 523.8
- 저자명
- Sharma, Yashvi.
- 서명/저자
- Chasing Metamorphic Supernovae with Zwicky Transient Facility, SEDM-KP, and AI
- 발행사항
- [Sl] : California Institute of Technology, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 230 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: Kulkarni, Shrinivas R.
- 학위논문주기
- Thesis (Ph.D.)--California Institute of Technology, 2025.
- 초록/해제
- 요약Modern time-domain astronomy has entered a data-rich era. Propelled by wide-field, high-cadence surveys like the Zwicky Transient Facility (ZTF) have vastly expanded our understanding of supernova (SN) diversity. However, the surge in discoveries has led to a classification bottleneck, particularly for spectroscopic follow-up, hindering the timely identification of rare or unusual transients. This thesis focuses on a class of unusually long-lived SNe with bumpy light curves, and also addresses the broader classification challenge through instrumentation and the application of artificial intelligence.Two rare SN classes are examined in depth through systematic samples: (i) SNe Ia-CSM, which initially have SNe Ia-like spectra but later transform into Type IIn-like SNe strongly interacting with circumstellar material (CSM), challenging our understanding of their progenitor systems; and (ii) double-peaked stripped-envelope supernovae (SESNe), where multiple light curve peaks suggest contributions from diverse energy sources including double-nickel distribution, CSM interaction, or magnetar engines. I derive constraints on the observed rates of SNe Ia-CSM with the systematic sample, and identify spectroscopic features that can differentiate between the strongly-interacting spectra of SNe Ia-CSM from SNe IIn. I discuss the diversity of double-peaked SESN light curves in the context of the plethora of suggested powering mechanisms and derive light curve properties that can help narrow down the possibilities.To enable more effective discovery and classification of such events, this thesis also presents instrumental and computational advances. I detail the commissioning of a new low-resolution robotic spectrograph, SEDM-KP, on the Kitt Peak 84-inch telescope, designed to extend spectroscopic classification to fainter transients. Additionally, I introduce a deep-learning-based tool, CCSNscore, which achieves high accuracy in automated core-collapse supernova classification from low-resolution spectra, significantly reducing human workload and latency in reporting.Together, these contributions advance our ability to identify, classify, and study the growing zoo of transient phenomena and lay the groundwork for managing the deluge of discoveries anticipated in the Rubin Observatory era.
- 일반주제명
- Supernovae
- 일반주제명
- Deep learning
- 일반주제명
- Spectrum analysis
- 일반주제명
- Open source software
- 일반주제명
- Explosions
- 기타저자
- California Institute of Technology Physics Mathematics and Astronomy
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202104749
■006m o d
■007cr#unu||||||||
■020 ▼a9798290653709
■035 ▼a(MiAaPQ)AAI32151324
■035 ▼a(MiAaPQ)Caltech17228
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523.8
■1001 ▼aSharma, Yashvi.
■24510▼aChasing Metamorphic Supernovae with Zwicky Transient Facility, SEDM-KP, and AI
■260 ▼a[Sl]▼bCalifornia Institute of Technology▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a230 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: Kulkarni, Shrinivas R.
■5021 ▼aThesis (Ph.D.)--California Institute of Technology, 2025.
■520 ▼aModern time-domain astronomy has entered a data-rich era. Propelled by wide-field, high-cadence surveys like the Zwicky Transient Facility (ZTF) have vastly expanded our understanding of supernova (SN) diversity. However, the surge in discoveries has led to a classification bottleneck, particularly for spectroscopic follow-up, hindering the timely identification of rare or unusual transients. This thesis focuses on a class of unusually long-lived SNe with bumpy light curves, and also addresses the broader classification challenge through instrumentation and the application of artificial intelligence.Two rare SN classes are examined in depth through systematic samples: (i) SNe Ia-CSM, which initially have SNe Ia-like spectra but later transform into Type IIn-like SNe strongly interacting with circumstellar material (CSM), challenging our understanding of their progenitor systems; and (ii) double-peaked stripped-envelope supernovae (SESNe), where multiple light curve peaks suggest contributions from diverse energy sources including double-nickel distribution, CSM interaction, or magnetar engines. I derive constraints on the observed rates of SNe Ia-CSM with the systematic sample, and identify spectroscopic features that can differentiate between the strongly-interacting spectra of SNe Ia-CSM from SNe IIn. I discuss the diversity of double-peaked SESN light curves in the context of the plethora of suggested powering mechanisms and derive light curve properties that can help narrow down the possibilities.To enable more effective discovery and classification of such events, this thesis also presents instrumental and computational advances. I detail the commissioning of a new low-resolution robotic spectrograph, SEDM-KP, on the Kitt Peak 84-inch telescope, designed to extend spectroscopic classification to fainter transients. Additionally, I introduce a deep-learning-based tool, CCSNscore, which achieves high accuracy in automated core-collapse supernova classification from low-resolution spectra, significantly reducing human workload and latency in reporting.Together, these contributions advance our ability to identify, classify, and study the growing zoo of transient phenomena and lay the groundwork for managing the deluge of discoveries anticipated in the Rubin Observatory era.
■590 ▼aSchool code: 0037.
■650 4▼aSupernovae
■650 4▼aDeep learning
■650 4▼aSpectrum analysis
■650 4▼aOpen source software
■650 4▼aExplosions
■690 ▼a0800
■71020▼aCalifornia Institute of Technology▼bPhysics, Mathematics and Astronomy.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0037
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358771▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


