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Subaru Seminars are
usually held in Room 104 of the Hilo Base Facility, adjacent
to the main lobby. Everyone is welcome to attend. If you would like to
give a seminar, please contact Subaru seminar organizers
(Rusu Cristian Eduard, Tae-Soo Pyo, Nagayoshi Ohashi)
by email : sseminar_at_subaru.naoj.org (please change"_at" to @).
December 26, Tuesday, 11am in 104A
" Spirals and Gaps: What Do They Tell Us about Embedded Planets "
Dr. Jeffrey Fung (Sagan Fellow, UC Berkeley)
Abstract: Planets that are still forming inside circumstellar disks can directly
constraint planet formation theory. While there are no direct methods
to detect them, we can infer their existence, even their properties,
though their gravitational influence on the disks. Two prominent
features of disk-planet interaction are spirals and gaps, and similar
features have been observed in state-of-the-art near-infrared and mm
observations. Using hydrodynamical and radiative transfer simulations,
we link together numerical models and observed disk features. I will
discuss the physical mechanisms behind the formation of these
structures, and answer some long-standing questions such as how many
spiral arms do one planet excite, and why sometimes we see spirals and
other times we see gaps. I will also present a number of methods to
weigh planets and measure disk parameters, focusing mainly on scattered
light observations. Finally, I will discuss what current observations
have already revealed to us, and how that matches or challenges our
current understanding of planet and disk evolution.