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SUMMARY:Hydrocarbon-rich Mantles in Super-Earths and Mini-Neptunes: Natura
 l Ingredients for Haze Production
DTSTART;VALUE=DATE-TIME:20220909T131500Z
DTEND;VALUE=DATE-TIME:20220909T133000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115924Z
UID:indico-contribution-114@meetings.aip.de
DESCRIPTION:Speakers: Edwin Bergin (University of Michigan)\nThe most comm
 on type of exoplanet discovered to date has a size that falls between Eart
 h-sized and Neptune-sized\, and orbits its star with a period less than 10
 0 days. Atmospheric characterization of these planets often finds featurel
 ess transmission spectra\, which is taken as evidence for the presence in 
 the of clouds or hazes in the upper atmosphere that obscure the presence o
 f deeper lying atmospheric constituents. We will present the results of a 
 new model that suggests hazy atmospheres are innate byproducts of planet f
 ormation\, where volatile ingredients are outgassed from the mantle and tr
 ansformed in the upper atmosphere after exposure to stellar photons.  Our 
 model relates the initial mantle composition of the planet to its formatio
 n zone around its star\, factoring in the relative contributions of refrac
 tories (metals and silicates) and volatile components (solid state organic
 s\, water vapor/ice\, and hydrogen-dominated nebular gas). We predict that
  a population of super-Earths will form in particular locations in their p
 rotoplanetary disks such that they receive significant inventories of orga
 nics\, but very low amounts of water. These hydrocarbon-rich planets are n
 ot carbon worlds\, but rather carbon-rich planets whose subsequent evoluti
 on would differ from typically assumed for terrestrial planets. We will sh
 ow models that encompass the geochemical equilibrium of the mantle and atm
 osphere\, compute the resulting atmospheric chemical equilibrium\, haze pr
 oduction\, and predicted spectra.\n\nhttps://meetings.aip.de/event/16/cont
 ributions/114/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/16/contributions/114/
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