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CATEGORIES:Class/Seminar
DESCRIPTION:How small can a planet be and still maintain an atmosphere? Whi
 le the upper size boundary of where a terrestrial planet becomes a gaseous 
 planet has been studied in detail\, there are few studies that examine the 
 lower planet mass and radius limit of habitability. At what point is a plan
 et too small to maintain an atmosphere? To explore this question\, we devel
 oped the Smaller Than Earth Habitability Model (STEHM)\, a model that coupl
 es the thermal evolution of the planet interior with atmospheric escape dri
 ven by stellar flux of a Sun-like star. Starting with an Earth-sized planet
  that orbits in the habitable zone of a sun-like star\, we step down in siz
 e to 0.5 Earth radii to determine at what point the planet can no longer ma
 intain an atmosphere. We test variations of the initial conditions of carbo
 n abundance\, heat producing elements (HPE)\, mantle temperature\, planet d
 ensity and position in the habitable zone. Join us to discover the results 
 of our study\, and what parameters were the most influential in determining
  atmospheric retention.\n\n \n\n \n\nDr. Michelle Hill is a postdoctoral re
 searcher and Stanford Science Fellow investigating exoplanet habitability i
 n the Earth and Planetary Sciences Department under the mentorship of Laura
  Schaefer. She recently completed her PhD in Earth and Planetary Sciences a
 t the University of California\, Riverside\, where her work centered on exo
 planet habitability\, planet detection using transit\, radial-velocity and 
 astrometry methods\, mass measurements and orbital refinement\, planet popu
 lation studies\, and exomoons. Originally from Australia\, Michelle complet
 ed her bachelor’s degree in astrophysics at the University of Southern Quee
 nsland.
DTEND:20260114T212000Z
DTSTAMP:20260307T124151Z
DTSTART:20260114T203000Z
GEO:37.426402;-122.172635
LOCATION:Mitchell Earth Sciences\, 350/372
SEQUENCE:0
SUMMARY:Planetary Science and Exploration Seminar\, Michelle Hill: "STEHM: 
 The Smaller Than Earth Habitability Model - Exploring the lower planet size
  of atmosphere retention."
UID:tag:localist.com\,2008:EventInstance_51774846283301
URL:https://events.stanford.edu/event/planetary-science-and-exploration-sem
 inar-michelle-hill-stehm-the-smaller-than-earth-habitability-model-explorin
 g-the-lower-planet-size-of-atmosphere-retention-6403
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