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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
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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■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.

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