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Use of Light Coherence for Exoplanet Detection and Characterization
Use of Light Coherence for Exoplanet Detection and Characterization
Use of Light Coherence for Exoplanet Detection and Characterization

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105057
ISBN  
9798288817403
DDC  
522.29
저자명  
Xin, Yeyuan Yinzi.
서명/저자  
Use of Light Coherence for Exoplanet Detection and Characterization
발행사항  
[Sl] : California Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
186 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
주기사항  
Advisor: Mawet, Dimitri.
학위논문주기  
Thesis (Ph.D.)--California Institute of Technology, 2025.
초록/해제  
요약Since the first detection of an exoplanet in 1992, over 5,000 exoplanets have now been found through a variety of methods, both indirect (such as the radial velocity or transit method) and direct (such as with imaging, coronagraphy, and interferometry). The direct imaging and spectroscopy of exoplanets in particular plays a key role in characterizing their atmospheres, which can help distinguish between different models of planet formation and detect molecular signatures associated with life. However, directly observing exoplanets is extremely difficult: the small angular separations between the star and the planet require large telescopes to resolve, and the flux ratios between a planet and its star range from 10⁻⁴ in the infrared for hot, young, massive planets to 10⁻¹⁰ in the optical for mature Earth-like planets. Photon noise from the star drowns out the planet signal in conventional imagers or spectrographs, so dedicated instruments are needed to remove the majority of the starlight before it reaches the detector. Additional wavefront sensing and control methods are also needed to compensate for aberrations in the system --- from fast varying atmospheric fluctuations to slower quasi-static drifts in the instrument and telescope.This thesis presents advances in instrumentation for directly characterizing exoplanets, focusing on exploiting the coherence properties of light to increase sensitivity. It presents the invention of the Photonic Lantern Nuller, which uses a multimode-to-single-mode demultiplexing waveguide to cancel out starlight while maintaining planet light, allowing for the direct characterization of planets at a telescope's diffraction limit. The PLN was experimentally characterized in the lab, enhanced using common-path wavefront sensing control techniques, and demonstrated on sky at the Subaru Telescope. This thesis also presents work on the Keck Planet Imager and Characterizer, a fiber-fed high-resolution spectrograph --- namely, the on-sky demonstration of the speckle nulling technique to destructively interfere residual starlight. Future directions in optimal stellar suppression and instrument-informed data analysis techniques are also discussed.The advances in instrumentation and methodology from this work have applications to giant planets on existing ten-meter class ground-based telescopes, Earth-like exoplanets on the planned Habitable Worlds Observatory space telescope, and many planets of interest on future thirty-meter class telescopes.
일반주제명  
Space telescopes
일반주제명  
Interferometry
일반주제명  
Fourier transforms
일반주제명  
Stars & galaxies
일반주제명  
Photonics
일반주제명  
Optics
일반주제명  
Astronomy
기타저자  
California Institute of Technology Physics Mathematics and Astronomy
기본자료저록  
Dissertations Abstracts International. 87-01B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aXin,  Yeyuan  Yinzi.▼0(orcid)0000-0002-6171-9081
■24510▼aUse  of  Light  Coherence  for  Exoplanet  Detection  and  Characterization
■260    ▼a[Sl]▼bCalifornia  Institute  of  Technology▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a186  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-01,  Section:  B.
■500    ▼aAdvisor:  Mawet,  Dimitri.
■5021  ▼aThesis  (Ph.D.)--California  Institute  of  Technology,  2025.
■520    ▼aSince  the  first  detection  of  an  exoplanet  in  1992,  over  5,000  exoplanets  have  now  been  found  through  a  variety  of  methods,  both  indirect  (such  as  the  radial  velocity  or  transit  method)  and  direct  (such  as  with  imaging,  coronagraphy,  and  interferometry).  The  direct  imaging  and  spectroscopy  of  exoplanets  in  particular  plays  a  key  role  in  characterizing  their  atmospheres,  which  can  help  distinguish  between  different  models  of  planet  formation  and  detect  molecular  signatures  associated  with  life.  However,  directly  observing  exoplanets  is  extremely  difficult:  the  small  angular  separations  between  the  star  and  the  planet  require  large  telescopes  to  resolve,  and  the  flux  ratios  between  a  planet  and  its  star  range  from  10⁻⁴  in  the  infrared  for  hot,  young,  massive  planets  to  10⁻¹⁰  in  the  optical  for  mature  Earth-like  planets.  Photon  noise  from  the  star  drowns  out  the  planet  signal  in  conventional  imagers  or  spectrographs,  so  dedicated  instruments  are  needed  to  remove  the  majority  of  the  starlight  before  it  reaches  the  detector.  Additional  wavefront  sensing  and  control  methods  are  also  needed  to  compensate  for  aberrations  in  the  system  ---  from  fast  varying  atmospheric  fluctuations  to  slower  quasi-static  drifts  in  the  instrument  and  telescope.This  thesis  presents  advances  in  instrumentation  for  directly  characterizing  exoplanets,  focusing  on  exploiting  the  coherence  properties  of  light  to  increase  sensitivity.  It  presents  the  invention  of  the  Photonic  Lantern  Nuller,  which  uses  a  multimode-to-single-mode  demultiplexing  waveguide  to  cancel  out  starlight  while  maintaining  planet  light,  allowing  for  the  direct  characterization  of  planets  at  a  telescope's  diffraction  limit.  The  PLN  was  experimentally  characterized  in  the  lab,  enhanced  using  common-path  wavefront  sensing  control  techniques,  and  demonstrated  on  sky  at  the  Subaru  Telescope.  This  thesis  also  presents  work  on  the  Keck  Planet  Imager  and  Characterizer,  a  fiber-fed  high-resolution  spectrograph  ---  namely,  the  on-sky  demonstration  of  the  speckle  nulling  technique  to  destructively  interfere  residual  starlight.  Future  directions  in  optimal  stellar  suppression  and  instrument-informed  data  analysis  techniques  are  also  discussed.The  advances  in  instrumentation  and  methodology  from  this  work  have  applications  to  giant  planets  on  existing  ten-meter  class  ground-based  telescopes,  Earth-like  exoplanets  on  the  planned  Habitable  Worlds  Observatory  space  telescope,  and  many  planets  of  interest  on  future  thirty-meter  class  telescopes.
■590    ▼aSchool  code:  0037.
■650  4▼aSpace  telescopes
■650  4▼aInterferometry
■650  4▼aFourier  transforms
■650  4▼aStars  &  galaxies
■650  4▼aPhotonics
■650  4▼aOptics
■650  4▼aAstronomy
■690    ▼a0752
■690    ▼a0606
■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=T17359295▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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