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SUMMARY:Dynamics in Extreme Environments: From Lava to Tatooine Planets
DTSTART:20260416T123000Z
DTEND:20260416T134500Z
DTSTAMP:20260417T163000Z
UID:indico-event-3026@indico.obspm.fr
CONTACT:Alain.Albouy@obspm.fr\;2126
DESCRIPTION:Speakers: Mohammat Farhat (Berkeley)\n\nPlanets in extreme ast
 rophysical regimes are valuable laboratories for building a self-consisten
 t picture of planet formation and evolution\, because their orbital\, geop
 hysical\, and thermodynamic conditions can reveal the governing physics mo
 st clearly. In this talk\, I focus on two such regimes.\nOrbiting at just 
 a few stellar radii\, ultra-short-period rocky planets experience intense 
 irradiation and strong tidal interactions. Time-domain observations are be
 ginning to resolve thermal emission patterns that encode coupled interior
 –surface–atmosphere processes. I will discuss how tidally driven lava 
 waves can excite a sloshing magma ocean\, depositing energy into the inter
 ior while reshaping surface temperature patterns and the planet’s therma
 l phase curve.\nIn the second regime\, I address the apparent scarcity of 
 circumbinary planets (CBPs). While early expectations suggested that CBPs 
 should be as common as planets around single stars\, only 14 transiting CB
 Ps have been identified to date by Kepler and TESS. This dearth becomes a 
 complete desert around the tightest binaries. I will propose a novel mecha
 nism to explain these observed features\, in which a non-linear secular re
 sonance encountered over a system’s evolution drives the CBP toward dyna
 mical instability\, ejection\, or engulfment by the binary.\n\nhttps://ind
 ico.obspm.fr/event/3026/
LOCATION:Salle Denisse (PARIS)
URL:https://indico.obspm.fr/event/3026/
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