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Compact Object Binaries in the Multiwavelength and Time Domain Sky
Compact Object Binaries in the Multiwavelength and Time Domain Sky
Compact Object Binaries in the Multiwavelength and Time Domain Sky

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202104755
ISBN  
9798290655123
DDC  
534.2
저자명  
Rodriguez, Antonio C.
서명/저자  
Compact Object Binaries in the Multiwavelength and Time Domain Sky
발행사항  
[Sl] : California Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
401 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
주기사항  
Advisor: Kulkarni, Shrinivas R.
학위논문주기  
Thesis (Ph.D.)--California Institute of Technology, 2025.
초록/해제  
요약Compact objects are natural laboratories to study the most extreme physics under conditions unable to be replicated anywhere on Earth. White dwarfs (WDs) are the most abundant compact objects, and when located in binaries, it becomes possible to measure physical properties such as mass and density. Remarkable phenomena result from interacting WD binaries; for instance, Type Ia supernovae, which established the existence of dark energy, likely result from the coalescence of two WDs or the accretion of matter by a WD in a binary.This thesis focuses primarily on interacting WD binaries, in the form of cataclysmic variables (CVs) and their ultracompact cousins, AM CVns. The main product of this thesis is the deepest X-ray survey of CVs and AM CVns to date, assembled using a multiwavelength crossmatch of the SRG/eROSITA all-sky X-ray catalog, Gaia, and time-domain photometry from the Zwicky Transient Facility (ZTF). I present a rejuvenated version of a tool used for the discovery of such systems in the X-ray + optical sky that would be missed in purely optical surveys. I calculated CV and AM CVn space densities and luminosity functions, and showed that 1) observations indeed reveal a dearth of accreting WDs compared to population synthesis predictions, and 2) the mean X-ray luminosity of CVs was overestimated by a factor of 10-100 in the past.Along the way, several single-object papers shine a new light on the diverse physics of binary star evolution. I report the discovery of the second-nearest eclipsing AM CVn and, by constraining binary parameters, show that the "evolved CV" formation channel, which only involves one episode of common envelope evolution, is most likely. I include work on multiwavelength follow-up of the nearest black holes to Earth, Gaia BH1 and BH2, and show that the the lack of a detection confirms predictions of hot accretion flows in the extreme sub-Eddington regime. Later, I present a multi-year, multiwavelength campaign of an enigmatic accreting WD, and argue that it is a missing link between rapidly spinning WD pulsars and slowly rotating polars. This object serves as strong evidence for the dynamo theory of WD magnetism in CVs, where a WD must be spun up by accretion to generate a strong magnetic field. Finally, I report optical spectroscopy of a new radio source pulsing on a 2.9-hr timescale, the slowest at the time of publication. I show that this is a WD + M dwarf binary with a particularly massive (∼ 1\uD835\uDC40⊙) WD, likely representing a new subclass of long period radio transients.
일반주제명  
Doppler effect
일반주제명  
Supernovae
일반주제명  
Accretion disks
일반주제명  
Spectrum analysis
일반주제명  
Black holes
일반주제명  
Magnetic fields
일반주제명  
Orbits
일반주제명  
X-rays
일반주제명  
Astrophysics
일반주제명  
Astronomy
키워드  
White dwarfs
키워드  
Dark energy
기타저자  
California Institute of Technology Physics Mathematics and Astronomy
기본자료저록  
Dissertations Abstracts International. 87-03B.
전자적 위치 및 접속  
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MARC

 008260126s2025        us                              c    eng  d
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■00520260202104755
■006m          o    d                
■007cr#unu||||||||
■020    ▼a9798290655123
■035    ▼a(MiAaPQ)AAI32151376
■035    ▼a(MiAaPQ)Caltech17352
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a534.2
■1001  ▼aRodriguez,  Antonio  C.
■24510▼aCompact  Object  Binaries  in  the  Multiwavelength  and  Time  Domain  Sky
■260    ▼a[Sl]▼bCalifornia  Institute  of  Technology▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a401  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-03,  Section:  B.
■500    ▼aAdvisor:  Kulkarni,  Shrinivas  R.
■5021  ▼aThesis  (Ph.D.)--California  Institute  of  Technology,  2025.
■520    ▼aCompact  objects  are  natural  laboratories  to  study  the  most  extreme  physics  under  conditions  unable  to  be  replicated  anywhere  on  Earth.  White  dwarfs  (WDs)  are  the  most  abundant  compact  objects,  and  when  located  in  binaries,  it  becomes  possible  to  measure  physical  properties  such  as  mass  and  density.  Remarkable  phenomena  result  from  interacting  WD  binaries;  for  instance,  Type  Ia  supernovae,  which  established  the  existence  of  dark  energy,  likely  result  from  the  coalescence  of  two  WDs  or  the  accretion  of  matter  by  a  WD  in  a  binary.This  thesis  focuses  primarily  on  interacting  WD  binaries,  in  the  form  of  cataclysmic  variables  (CVs)  and  their  ultracompact  cousins,  AM  CVns.  The  main  product  of  this  thesis  is  the  deepest  X-ray  survey  of  CVs  and  AM  CVns  to  date,  assembled  using  a  multiwavelength  crossmatch  of  the  SRG/eROSITA  all-sky  X-ray  catalog,  Gaia,  and  time-domain  photometry  from  the  Zwicky  Transient  Facility  (ZTF).  I  present  a  rejuvenated  version  of  a  tool  used  for  the  discovery  of  such  systems  in  the  X-ray  +  optical  sky  that  would  be  missed  in  purely  optical  surveys.  I  calculated  CV  and  AM  CVn  space  densities  and  luminosity  functions,  and  showed  that  1)  observations  indeed  reveal  a  dearth  of  accreting  WDs  compared  to  population  synthesis  predictions,  and  2)  the  mean  X-ray  luminosity  of  CVs  was  overestimated  by  a  factor  of  10-100  in  the  past.Along  the  way,  several  single-object  papers  shine  a  new  light  on  the  diverse  physics  of  binary  star  evolution.  I  report  the  discovery  of  the  second-nearest  eclipsing  AM  CVn  and,  by  constraining  binary  parameters,  show  that  the  "evolved  CV"  formation  channel,  which  only  involves  one  episode  of  common  envelope  evolution,  is  most  likely.  I  include  work  on  multiwavelength  follow-up  of  the  nearest  black  holes  to  Earth,  Gaia  BH1  and  BH2,  and  show  that  the  the  lack  of  a  detection  confirms  predictions  of  hot  accretion  flows  in  the  extreme  sub-Eddington  regime.  Later,  I  present  a  multi-year,  multiwavelength  campaign  of  an  enigmatic  accreting  WD,  and  argue  that  it  is  a  missing  link  between  rapidly  spinning  WD  pulsars  and  slowly  rotating  polars.  This  object  serves  as  strong  evidence  for  the  dynamo  theory  of  WD  magnetism  in  CVs,  where  a  WD  must  be  spun  up  by  accretion  to  generate  a  strong  magnetic  field.  Finally,  I  report  optical  spectroscopy  of  a  new  radio  source  pulsing  on  a  2.9-hr  timescale,  the  slowest  at  the  time  of  publication.  I  show  that  this  is  a  WD  +  M  dwarf  binary  with  a  particularly  massive  (∼  1\uD835\uDC40⊙)  WD,  likely  representing  a  new  subclass  of  long  period  radio  transients.
■590    ▼aSchool  code:  0037.
■650  4▼aDoppler  effect
■650  4▼aSupernovae
■650  4▼aAccretion  disks
■650  4▼aSpectrum  analysis
■650  4▼aBlack  holes
■650  4▼aMagnetic  fields
■650  4▼aOrbits
■650  4▼aX-rays
■650  4▼aAstrophysics
■650  4▼aAstronomy
■653    ▼aWhite  dwarfs
■653    ▼aDark  energy
■690    ▼a0596
■690    ▼a0606
■71020▼aCalifornia  Institute  of  Technology▼bPhysics,  Mathematics  and  Astronomy.
■7730  ▼tDissertations  Abstracts  International▼g87-03B.
■790    ▼a0037
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358809▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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