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The Landscape of Stellar Mergers with Time-Domain Surveys
The Landscape of Stellar Mergers with Time-Domain Surveys
The Landscape of Stellar Mergers with Time-Domain Surveys

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자료유형  
 학위논문 서양
최종처리일시  
20260202104749
ISBN  
9798290651477
DDC  
523.80223
저자명  
Karambelkar, Viraj.
서명/저자  
The Landscape of Stellar Mergers with Time-Domain Surveys
발행사항  
[Sl] : California Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
348 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
주기사항  
Advisor: Kasliwal, Mansi M.
학위논문주기  
Thesis (Ph.D.)--California Institute of Technology, 2025.
초록/해제  
요약Stellar mergers result in a wide range of outcomes, from luminous cosmic transients to peculiar variable stars. Mergers provide valuable insights into a broad range of astrophysical phenomena, from stellar evolution to gravitational waves to the origins of the universe's heaviest elements. In this thesis, I systematically explore the outcomes of merging white dwarfs, merging neutron stars, and merging massive stars, using robotic survey telescopes to fill gaps in our understanding of the diverse merger landscape.In Part I of this thesis, I present the first infrared census of dusty variable stars formed from low-mass white dwarf mergers. This population offers new insights into the binary white dwarfs that will be detected by the upcoming Laser Interferometer Space Antenna (LISA). I also present the least luminous thermonuclear supernova discovered to date, which possibly originated in the merger of two massive white dwarfs.In Part II of this thesis, I present the data processing pipeline of the novel Wide-field Infrared Transient Explorer (WINTER) surveyor at Palomar Observatory, designed for infrared followup of gravitational wave events from neutron star mergers. I present results from WINTER's first search for an infrared counterpart to a neutron star merger recently detected by the International Gravitational Wave Network.In Part III of this thesis, I present the first systematic study of extragalactic transient eruptions from massive stellar mergers and estimate their volumetric rate and luminosity function. I also present the first infrared observations of such mergers with the James Webb Space Telescope, which suggest that stellar mergers could be significant contributors to the cosmic dust budget. Additionally, I present a slow-evolving infrared transient identified by WINTER that originated in a merger involving a giant star primary, revealing a new class of events that have been overlooked by previous optical surveys.Together, these studies set the stage for more comprehensive explorations of the merger landscape in the future, with i) the Vera Rubin Observatory to study large populations of low luminosity transients from massive stellar mergers and white-dwarf mergers, and ii) the upcoming suite of ground and space-based infrared surveys to discover the dustiest stellar mergers and quantify their contributions to the cosmic dust budget.
일반주제명  
Stars & galaxies
일반주제명  
Supernovae
일반주제명  
Gravitational waves
일반주제명  
Neutrons
일반주제명  
Neutron stars
일반주제명  
Astronomy
기타저자  
California Institute of Technology Physics Mathematics and Astronomy
기본자료저록  
Dissertations Abstracts International. 87-04B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798290651477
■035    ▼a(MiAaPQ)AAI32151323
■035    ▼a(MiAaPQ)Caltech17227
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a523.80223
■1001  ▼aKarambelkar,  Viraj.
■24510▼aThe  Landscape  of  Stellar  Mergers  with  Time-Domain  Surveys
■260    ▼a[Sl]▼bCalifornia  Institute  of  Technology▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a348  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-04,  Section:  B.
■500    ▼aAdvisor:  Kasliwal,  Mansi  M.
■5021  ▼aThesis  (Ph.D.)--California  Institute  of  Technology,  2025.
■520    ▼aStellar  mergers  result  in  a  wide  range  of  outcomes,  from  luminous  cosmic  transients  to  peculiar  variable  stars.  Mergers  provide  valuable  insights  into  a  broad  range  of  astrophysical  phenomena,  from  stellar  evolution  to  gravitational  waves  to  the  origins  of  the  universe's  heaviest  elements.  In  this  thesis,  I  systematically  explore  the  outcomes  of  merging  white  dwarfs,  merging  neutron  stars,  and  merging  massive  stars,  using  robotic  survey  telescopes  to  fill  gaps  in  our  understanding  of  the  diverse  merger  landscape.In  Part  I  of  this  thesis,  I  present  the  first  infrared  census  of  dusty  variable  stars  formed  from  low-mass  white  dwarf  mergers.  This  population  offers  new  insights  into  the  binary  white  dwarfs  that  will  be  detected  by  the  upcoming  Laser  Interferometer  Space  Antenna  (LISA).  I  also  present  the  least  luminous  thermonuclear  supernova  discovered  to  date,  which  possibly  originated  in  the  merger  of  two  massive  white  dwarfs.In  Part  II  of  this  thesis,  I  present  the  data  processing  pipeline  of  the  novel  Wide-field  Infrared  Transient  Explorer  (WINTER)  surveyor  at  Palomar  Observatory,  designed  for  infrared  followup  of  gravitational  wave  events  from  neutron  star  mergers.  I  present  results  from  WINTER's  first  search  for  an  infrared  counterpart  to  a  neutron  star  merger  recently  detected  by  the  International  Gravitational  Wave  Network.In  Part  III  of  this  thesis,  I  present  the  first  systematic  study  of  extragalactic  transient  eruptions  from  massive  stellar  mergers  and  estimate  their  volumetric  rate  and  luminosity  function.  I  also  present  the  first  infrared  observations  of  such  mergers  with  the  James  Webb  Space  Telescope,  which  suggest  that  stellar  mergers  could  be  significant  contributors  to  the  cosmic  dust  budget.  Additionally,  I  present  a  slow-evolving  infrared  transient  identified  by  WINTER  that  originated  in  a  merger  involving  a  giant  star  primary,  revealing  a  new  class  of  events  that  have  been  overlooked  by  previous  optical  surveys.Together,  these  studies  set  the  stage  for  more  comprehensive  explorations  of  the  merger  landscape  in  the  future,  with  i)  the  Vera  Rubin  Observatory  to  study  large  populations  of  low  luminosity  transients  from  massive  stellar  mergers  and  white-dwarf  mergers,  and  ii)  the  upcoming  suite  of  ground  and  space-based  infrared  surveys  to  discover  the  dustiest  stellar  mergers  and  quantify  their  contributions  to  the  cosmic  dust  budget.
■590    ▼aSchool  code:  0037.
■650  4▼aStars  &  galaxies
■650  4▼aSupernovae
■650  4▼aGravitational  waves
■650  4▼aNeutrons
■650  4▼aNeutron  stars
■650  4▼aAstronomy
■690    ▼a0606
■71020▼aCalifornia  Institute  of  Technology▼bPhysics,  Mathematics  and  Astronomy.
■7730  ▼tDissertations  Abstracts  International▼g87-04B.
■790    ▼a0037
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358770▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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