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CATEGORIES:Class/Seminar
DESCRIPTION:An emerging population of irradiated\, low-mass exoplanets fall
 s close to rocky bulk densities but are underdense relative to Earth-like c
 omposition. In this talk\, I will first discuss my previous work\, where Pr
 of. Diana Valencia and I proposed puffy Venuses\, magma ocean worlds with t
 hick carbon-rich atmospheres\, as a potential explanation. To this end\, we
  constructed a coupled magma-ocean atmosphere model that accounted for carb
 on and hydrogen partitioning between the atmosphere and molten mantle\, as 
 well as the C-H-O thermochemistry in a dual-gray radiative-convective atmos
 phere. We demonstrated that moderate\, chondritic C abundance can generate 
 observable underdensity in puffy Venuses\, and highlighted exoplanet candid
 ates for this interpretation. I will then discuss recent theoretical and ob
 servational works in relation to puffy Venuses. Finally\, I will present my
  ongoing work with Prof. Laura Schaefer on C precipitation in rocky planets
 . C precipitation\, in both the atmosphere and the interior\, can facilitat
 e the long-term survival of an outgassed atmosphere by enhancing their C st
 orage capacity. This is because C precipitation can both limit the atmosphe
 re’s mass and form a mantle C reservoir independent from dissolved atmosphe
 ric species. We adapt the puffy Venus atmosphere model to probe the irradia
 tion and redox conditions that lead to C precipitation-limited atmospheres\
 , and their observational consequences. We also discuss the phases and dist
 ribution of atomic C in the primordial magma oceans of C-rich super-Earths 
 by calculating their buoyancy in molten MgSiO3 across wide P-T ranges. \n\n
 Speaker-suggested reading: Piette\, A. A. A.\, Gao\, P.\, Brugman\, K.\, Sh
 ahar\, A.\, Lichtenberg\, T.\, Miozzi\, F.\, and Driscoll\, P.\, 2023\, Roc
 ky planet or water world? Observability of low-density lava world atmospher
 es: The Astrophysical Journal\, v. 954\, p. 29\, doi:10.3847/1538-4357/acde
 f2.\n\nDr. Bo Peng is a postdoctoral fellow investigating magma ocean world
 s both beyond and within our Solar System\, in the Earth & Planetary Scienc
 es department under the mentorship of Prof. Laura Schaefer. He recently com
 pleted his PhD in Astronomy & Astrophysics at the University of Toronto\, w
 here he worked on volatile delivery during planet formation\, chondritic pa
 rent body evolution\, giant impact-induced magma oceans and lava world exop
 lanets. Bo completed his bachelor’s degree in physics and astronomy at the 
 University of Rochester. In his free time\, Bo enjoys cooking and recently 
 started birdwatching.
DTEND:20260408T202000Z
DTSTAMP:20260412T085153Z
DTSTART:20260408T193000Z
GEO:37.426402;-122.172635
LOCATION:Mitchell Earth Sciences\, 350/372
SEQUENCE:0
SUMMARY:Planetary Science and Exploration Seminar\, Bo Peng\, "Puffy Venuse
 s and their others: the puzzles of irradiated\, underdense rocky worlds"
UID:tag:localist.com\,2008:EventInstance_52506153399428
URL:https://events.stanford.edu/event/planetary-science-and-exploration-sem
 inar-bo-peng-puffy-venuses-and-their-others-the-puzzles-of-irradiated-under
 dense-rocky-worlds
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