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Geophysical Evolution of Sputnik Basin on Pluto
Geophysical Evolution of Sputnik Basin on Pluto
Geophysical Evolution of Sputnik Basin on Pluto

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202105123
ISBN  
9798293813209
DDC  
523.4
저자명  
Moruzzi, Samantha Anne.
서명/저자  
Geophysical Evolution of Sputnik Basin on Pluto
발행사항  
[Sl] : The University of Arizona, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
192 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
주기사항  
Advisor: Andrews-Hanna, Jeff.
학위논문주기  
Thesis (Ph.D.)--The University of Arizona, 2025.
초록/해제  
요약The past and present subsurface structure of icy outer Solar System worlds, such as Pluto, provides insight into their formation and interior evolution. Placing constraints on the structure of planetary interiors has been one of the primary challenges in the field of Solar System science. NASA's New Horizons mission flyby of Pluto in 2015 revealed its surface in high resolution for the first time but did not gather any spatially resolved gravitational data. Consequently, Pluto's interior is still mostly unknown. Sputnik basin, an ~2000 x 1000 km elongated impact basin in Pluto's equatorial region observed on the encounter hemisphere, has played an integral role in shedding light on Pluto's interior. In this thesis, I present new interpretations of Sputnik basin's structure and support, proposing an evolutionary pathway for the basin with implications for Pluto's past and present interior structure.This dissertation analyzes Sputnik basin through a set of multi-faceted techniques, including structural characterization of the basin, geoid and thermal modeling, to present a seamless story of the basin's evolution. My investigations in Chapter 2 revealed that Sputnik basin is consistent with peak-/multiring basins in the inner Solar System, implying a decrease in any subsurface uplift by ~ 40%. A proposed peak-ring structure redefines the impactor diameter, impact angle, and subsequent impact basin evolution. In Chapter 3, I use a novel approach assuming the low-viscosity deposit within the basin conforms to Pluto's geoid and calculate the gravity field over the basin considering both giant impact and peak-ring structures. Sputnik basin is most likely uncompensated and a mass deficit today. Here, I first propose that Sputnik basin may have transitioned from a past mass excess or overcompensated state to a present-day mass deficit through refreezing of the uplifted subsurface ocean beneath the basin. In Chapter 4, I utilize thermal modeling to show that this process can result in transitioning the basin's mass anomaly to a current mass deficit. Inclusion of insulating layers and properties does not affect our results despite their influence on the refreezing timescale of the Pluto's ice shell. These findings contribute to our understanding of Sputnik basin's geophysical evolution, demonstrating the importance of large impact basin studies on data-limited icy outer Solar System worlds like Pluto.
일반주제명  
Planetology
일반주제명  
Geophysics
일반주제명  
Computational physics
키워드  
Pluto
키워드  
Sputnik basin
키워드  
Solar System
기타저자  
The University of Arizona Planetary Sciences
기본자료저록  
Dissertations Abstracts International. 87-03B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■1001  ▼aMoruzzi,  Samantha  Anne.▼0(orcid)0000-0002-7271-4921
■24510▼aGeophysical  Evolution  of  Sputnik  Basin  on  Pluto
■260    ▼a[Sl]▼bThe  University  of  Arizona▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a192  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-03,  Section:  B.
■500    ▼aAdvisor:  Andrews-Hanna,  Jeff.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Arizona,  2025.
■520    ▼aThe  past  and  present  subsurface  structure  of  icy  outer  Solar  System  worlds,  such  as  Pluto,  provides  insight  into  their  formation  and  interior  evolution.  Placing  constraints  on  the  structure  of  planetary  interiors  has  been  one  of  the  primary  challenges  in  the  field  of  Solar  System  science.  NASA's  New  Horizons  mission  flyby  of  Pluto  in  2015  revealed  its  surface  in  high  resolution  for  the  first  time  but  did  not  gather  any  spatially  resolved  gravitational  data.  Consequently,  Pluto's  interior  is  still  mostly  unknown.  Sputnik  basin,  an  ~2000  x  1000  km  elongated  impact  basin  in  Pluto's  equatorial  region  observed  on  the  encounter  hemisphere,  has  played  an  integral  role  in  shedding  light  on  Pluto's  interior.  In  this  thesis,  I  present  new  interpretations  of  Sputnik  basin's  structure  and  support,  proposing  an  evolutionary  pathway  for  the  basin  with  implications  for  Pluto's  past  and  present  interior  structure.This  dissertation  analyzes  Sputnik  basin  through  a  set  of  multi-faceted  techniques,  including  structural  characterization  of  the  basin,  geoid  and  thermal  modeling,  to  present  a  seamless  story  of  the  basin's  evolution.  My  investigations  in  Chapter  2  revealed  that  Sputnik  basin  is  consistent  with  peak-/multiring  basins  in  the  inner  Solar  System,  implying  a  decrease  in  any  subsurface  uplift  by  ~  40%.  A  proposed  peak-ring  structure  redefines  the  impactor  diameter,  impact  angle,  and  subsequent  impact  basin  evolution.  In  Chapter  3,  I  use  a  novel  approach  assuming  the  low-viscosity  deposit  within  the  basin  conforms  to  Pluto's  geoid  and  calculate  the  gravity  field  over  the  basin  considering  both  giant  impact  and  peak-ring  structures.  Sputnik  basin  is  most  likely  uncompensated  and  a  mass  deficit  today.  Here,  I  first  propose  that  Sputnik  basin  may  have  transitioned  from  a  past  mass  excess  or  overcompensated  state  to  a  present-day  mass  deficit  through  refreezing  of  the  uplifted  subsurface  ocean  beneath  the  basin.  In  Chapter  4,  I  utilize  thermal  modeling  to  show  that  this  process  can  result  in  transitioning  the  basin's  mass  anomaly  to  a  current  mass  deficit.  Inclusion  of  insulating  layers  and  properties  does  not  affect  our  results  despite  their  influence  on  the  refreezing  timescale  of  the  Pluto's  ice  shell.  These  findings  contribute  to  our  understanding  of  Sputnik  basin's  geophysical  evolution,  demonstrating  the  importance  of  large  impact  basin  studies  on  data-limited  icy  outer  Solar  System  worlds  like  Pluto.
■590    ▼aSchool  code:  0009.
■650  4▼aPlanetology
■650  4▼aGeophysics
■650  4▼aComputational  physics
■653    ▼aPluto
■653    ▼aSputnik  basin
■653    ▼aSolar  System
■690    ▼a0590
■690    ▼a0373
■690    ▼a0216
■690    ▼a0467
■71020▼aThe  University  of  Arizona▼bPlanetary  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g87-03B.
■790    ▼a0009
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359468▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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