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Faculté des Sciences
Faculté des Sciences
MASTER THESIS
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Heat Effect of Meteorite Impacts on the Degassing of Methane Trapped in Mars' Icy Soil

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Joiret, Sarah ULiège
Promotor(s) : Dehant, Véronique
Date of defense : 29-Jun-2020/30-Jun-2020 • Permalink : http://hdl.handle.net/2268.2/9346
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Title : Heat Effect of Meteorite Impacts on the Degassing of Methane Trapped in Mars' Icy Soil
Author : Joiret, Sarah ULiège
Date of defense  : 29-Jun-2020/30-Jun-2020
Advisor(s) : Dehant, Véronique 
Committee's member(s) : Gloesener, Elodie 
Jehin, Emmanuel ULiège
Grodent, Denis ULiège
Karatekin, Ozgur 
Language : English
Keywords : [en] Mars
[en] Impacts
[en] Methane`
Discipline(s) : Physical, chemical, mathematical & earth Sciences > Space science, astronomy & astrophysics
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en sciences spatiales, à finalité approfondie
Faculty: Master thesis of the Faculté des Sciences

Abstract

[en] This master's thesis is devoted to assess whether a small impactor can lead to destabilization of clathrates and degassing of methane. Therefore, the increase of temperature as a result of impact energy is theoretically and numerically investigated. First, a discussion on the theoretical model, which is used to calculate the temperature increase following the impact event as a function of the impactor radius, velocity and impact angle, is presented. A comparison study of the two theoretical models considered in this study, Gault-Heitowit and Murnaghan equation of state, is then proposed. The Martian subsurface temperatures are also calculated from the heat equation using the Crank-Nicholson method. The sensitivity of temperature predictions on the thermal conductivity is investigated. The impact-induced temperatures are then added to the initial subsurface temperatures for different case studies. The final step consists of verifying if the temperature at a certain depth allows the destabilization of methane clathrates, and thus degassing of methane, both for equatorial and polar regions, for different thermal conductivities of the subsurface (ranging from 0.039 W/mK to 2.5 W/mK), radii (0.06 m, 0.12 m and 0.20 m) and velocities (8 km/s, 10 km/s and 12 km/s) of the impactor.


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Author

  • Joiret, Sarah ULiège Université de Liège > Master sc. spatiales, à fin.

Promotor(s)

Committee's member(s)

  • Gloesener, Elodie ORB
  • Jehin, Emmanuel ULiège Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
    ORBi View his publications on ORBi
  • Grodent, Denis ULiège Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
    ORBi View his publications on ORBi
  • Karatekin, Ozgur ORB
  • Total number of views 81
  • Total number of downloads 4










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