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SUMMARY:Planet Nine: To Be or Not To Be - Mr Antranik A. Sefilian
DTSTART:20190131T131000Z
DTEND:20190131T140000Z
UID:TALK117586@talks.cam.ac.uk
CONTACT:Holly
DESCRIPTION:Observational campaigns\, over the last two decades\, have rev
 ealed a new mystery related to our own Solar System. As it turns out\, icy
  bodies orbiting the Sun beyond the orbit of Neptune exhibit unexpected or
 bital architecture. Specifically\, observations have unveiled that a subse
 t of such small bodies  - known as trans-Neptunian objects  - have their o
 rbits spatially clustered. Such spatially clustered configurations can not
  be explained by the current eight-planet Solar System architecture. This 
 has led to the so-called “Planet Nine” hypothesis: a yet undiscovered 
 super-Earth resides in the distant Solar System inducing\, and maintaining
 \, the puzzling orbital configurations.\nIn this talk\, I will first expla
 in the observational signatures which promoted the aforementioned “Plane
 t Nine” hypothesis.  I will then put forward an alternative which could 
 obviate the need for “Planet Nine”. Specifically\, I will demonstrate 
 how the gravitational effects of a relatively massive population of trans-
 Neptunian objects can naturally provide an explanation for the observed sp
 atial clustering.
LOCATION:The Richard King Room\, Darwin College
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