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Fresh Eyes for an Old Moon: ALMA & JWST Perspectives of Callisto
Fresh Eyes for an Old Moon: ALMA & JWST Perspectives of Callisto
Fresh Eyes for an Old Moon: ALMA & JWST Perspectives of Callisto

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202104751
ISBN  
9798290653594
DDC  
523.45
저자명  
Camarca, Maria Noel.
서명/저자  
Fresh Eyes for an Old Moon: ALMA & JWST Perspectives of Callisto
발행사항  
[Sl] : California Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
140 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
주기사항  
Advisor: de Kleer, Katherine.
학위논문주기  
Thesis (Ph.D.)--California Institute of Technology, 2025.
초록/해제  
요약As though its surface were frozen in time, Jupiter's moon Callisto has seemingly done little more than collect and degrade impact features since its formation some ∼4.5 billion years ago. One outcome of Callisto's quiescence is that its geologic map retains only a few units, with large-scale landforms consisting of either enormous multi-ring impact basins or crater-laden plains. Despite this geologic simplicity, our knowledgebase of Callisto's material surface properties and volatile ice distributions is limited compared to the other icy Galilean moons. Understanding how Callisto localizes its thermal properties and delicate volatile ices is essential to understanding how long-term particle bombardment, solar insolation, and extended impact damage has sculpted its aged surface. While Callisto's much more active sibling satellites have scrubbed some or all of their surfaces free of the most ancient records, the oldest surface processes in the Galilean system remain visible today on Callisto. And with large telescope facilities such as the Atacama Large Millimeter/submillimeter Array (ALMA) and the James Web Space Telescope, these surface properties are now accessible to Earth-based observers.In Chapters 2 and 3 of my dissertation, I complete the icy Galilean satellite ALMA catalog with the full Callisto dataset which includes leading and trailing hemisphere images at ALMA Bands 7, 6, and 3, corresponding to 343, 223, and 97 GHz, respectively. At these frequencies, we sample the subsurface depths of order a few centimeters down to about half a meter. From these data, I demonstrate that Callisto's' subsurface thermal emission is much less susceptible to diurnal variation compared to the other icy satellites and that while Callisto's largest craters are thermally consistent with much smaller ones, the warm surface anomalies tell a story of impact bombardment not recorded in current geologic maps. Moreover, I identify several cold anomalies associated with large impacts, as well as one that might be relevant to Callisto's tenuous and patchy CO2 atmosphere.In Chapter 4 of my dissertation, I present the results from a JWST NIRSpec 2.85-5.35 µm observing campaign that allowed us to inspect many of Callisto's volatile surface materials for the first time since the end of the Galileo mission in the early 2000s. In this work, I identify the Lofn/Heimdall impact region as Callisto's largest source of non-radiolytic CO2. This particular crater suite may represent one of the best locations on Callisto to look for deep subsurface materials brought to the surface by the impact. Additionally, I propose Callisto's well-known radiolytic CO2 trailing hemisphere bullseye is accompanied by a second bullseye in water ice exposure that may share a common origin.Lastly, in Chapter 5, I offer a brief synthesis of the icy moon ALMA survey, an endeavor that fulfills scientific promises that pre-date the array itself.Altogether, this dissertation offers the community two of the key Callisto datasets of the 2020s era of research. Now that ESA's JUICE mission and NASA's Europa Clipper are en-route to the Jovian system, this research offers a timely complement to what is a blossoming era for Callisto and broader icy satellite exploration.
일반주제명  
Jupiter
일반주제명  
Space telescopes
일반주제명  
Spectrum analysis
일반주제명  
Astrophysics
키워드  
Callisto
기타저자  
California Institute of Technology Geological and Planetary Sciences
기본자료저록  
Dissertations Abstracts International. 87-03B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798290653594
■035    ▼a(MiAaPQ)AAI32151346
■035    ▼a(MiAaPQ)Caltech17281
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a523.45
■1001  ▼aCamarca,  Maria  Noel.
■24510▼aFresh  Eyes  for  an  Old  Moon:  ALMA  &  JWST  Perspectives  of  Callisto
■260    ▼a[Sl]▼bCalifornia  Institute  of  Technology▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a140  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-03,  Section:  B.
■500    ▼aAdvisor:  de  Kleer,  Katherine.
■5021  ▼aThesis  (Ph.D.)--California  Institute  of  Technology,  2025.
■520    ▼aAs  though  its  surface  were  frozen  in  time,  Jupiter's  moon  Callisto  has  seemingly  done  little  more  than  collect  and  degrade  impact  features  since  its  formation  some  ∼4.5  billion  years  ago.  One  outcome  of  Callisto's  quiescence  is  that  its  geologic  map  retains  only  a  few  units,  with  large-scale  landforms  consisting  of  either  enormous  multi-ring  impact  basins  or  crater-laden  plains.  Despite  this  geologic  simplicity,  our  knowledgebase  of  Callisto's  material  surface  properties  and  volatile  ice  distributions  is  limited  compared  to  the  other  icy  Galilean  moons.  Understanding  how  Callisto  localizes  its  thermal  properties  and  delicate  volatile  ices  is  essential  to  understanding  how  long-term  particle  bombardment,  solar  insolation,  and  extended  impact  damage  has  sculpted  its  aged  surface.  While  Callisto's  much  more  active  sibling  satellites  have  scrubbed  some  or  all  of  their  surfaces  free  of  the  most  ancient  records,  the  oldest  surface  processes  in  the  Galilean  system  remain  visible  today  on  Callisto.  And  with  large  telescope  facilities  such  as  the  Atacama  Large  Millimeter/submillimeter  Array  (ALMA)  and  the  James  Web  Space  Telescope,  these  surface  properties  are  now  accessible  to  Earth-based  observers.In  Chapters  2  and  3  of  my  dissertation,  I  complete  the  icy  Galilean  satellite  ALMA  catalog  with  the  full  Callisto  dataset  which  includes  leading  and  trailing  hemisphere  images  at  ALMA  Bands  7,  6,  and  3,  corresponding  to  343,  223,  and  97  GHz,  respectively.  At  these  frequencies,  we  sample  the  subsurface  depths  of  order  a  few  centimeters  down  to  about  half  a  meter.  From  these  data,  I  demonstrate  that  Callisto's'  subsurface  thermal  emission  is  much  less  susceptible  to  diurnal  variation  compared  to  the  other  icy  satellites  and  that  while  Callisto's  largest  craters  are  thermally  consistent  with  much  smaller  ones,  the  warm  surface  anomalies  tell  a  story  of  impact  bombardment  not  recorded  in  current  geologic  maps.  Moreover,  I  identify  several  cold  anomalies  associated  with  large  impacts,  as  well  as  one  that  might  be  relevant  to  Callisto's  tenuous  and  patchy  CO2  atmosphere.In  Chapter  4  of  my  dissertation,  I  present  the  results  from  a  JWST  NIRSpec  2.85-5.35  µm  observing  campaign  that  allowed  us  to  inspect  many  of  Callisto's  volatile  surface  materials  for  the  first  time  since  the  end  of  the  Galileo  mission  in  the  early  2000s.  In  this  work,  I  identify  the  Lofn/Heimdall  impact  region  as  Callisto's  largest  source  of  non-radiolytic  CO2.  This  particular  crater  suite  may  represent  one  of  the  best  locations  on  Callisto  to  look  for  deep  subsurface  materials  brought  to  the  surface  by  the  impact.  Additionally,  I  propose  Callisto's  well-known  radiolytic  CO2  trailing  hemisphere  bullseye  is  accompanied  by  a  second  bullseye  in  water  ice  exposure  that  may  share  a  common  origin.Lastly,  in  Chapter  5,  I  offer  a  brief  synthesis  of  the  icy  moon  ALMA  survey,  an  endeavor  that  fulfills  scientific  promises  that  pre-date  the  array  itself.Altogether,  this  dissertation  offers  the  community  two  of  the  key  Callisto  datasets  of  the  2020s  era  of  research.  Now  that  ESA's  JUICE  mission  and  NASA's  Europa  Clipper  are  en-route  to  the  Jovian  system,  this  research  offers  a  timely  complement  to  what  is  a  blossoming  era  for  Callisto  and  broader  icy  satellite  exploration.
■590    ▼aSchool  code:  0037.
■650  4▼aJupiter
■650  4▼aSpace  telescopes
■650  4▼aSpectrum  analysis
■650  4▼aAstrophysics
■653    ▼aCallisto
■690    ▼a0596
■71020▼aCalifornia  Institute  of  Technology▼bGeological  and  Planetary  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g87-03B.
■790    ▼a0037
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358786▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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