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CATEGORIES:DAMTP Astrophysics Seminars
SUMMARY:Tidal Sculpting of Short-Period Exoplanets - Sarah
  Millholland - Princeton University
DTSTART;TZID=Europe/London:20210524T140000
DTEND;TZID=Europe/London:20210524T150000
UID:TALK157984AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/157984
DESCRIPTION:Multiple-planet systems composed of close-in super
 -Earth/sub-Neptune-sized planets are ubiquitous\, 
 representing a dominant outcome of planet formatio
 n. This population exhibits predictable hallmarks 
 of architectural regularity and uniformity\, such 
 as low eccentricities and inclinations\, similar o
 rbital spacings\, and intra-system correlations in
  planetary masses and radii. On top of this first-
 order structure\, however\, these systems also exh
 ibit surprising anomalies that require explanation
 . Examples include (1) ultra-short period planets\
 , whose extremely-irradiated orbits have been sepa
 rated off from the rest of their systems\; (2) pla
 nets piled up wide of mean-motion resonances\; and
  (3) a subset of Neptune-sized planets that show s
 igns of radius inflation. In this talk\, I will pr
 opose that tidal dynamics can account for these sp
 ecific anomalies and more. Specifically\, I will d
 iscuss the critical role of enhanced tidal dissipa
 tion due to non-zero planetary axial tilts (obliqu
 ities)\, which arise by way of prevalent dynamical
  resonances. I will highlight strategies for testi
 ng these tidal theories and observing obliquities 
 directly in the future.
LOCATION:Online
CONTACT:Cleo Loi
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