Planet のバックアップ(No.10)

惑星セミナー2019 †

惑星セミナーは原則として毎週木曜日の14:00から理論部セミナー室で開催しています。
astro-phセミナーは毎週金曜日の12:00から理論部セミナー室で開催しています。

日程	発表	タイトル	Remarks
前期第1回 4/11 14:30-	Shinsuke Takasao	3D MHD simulations of Inner Protoplanetary Disks	14:30
前期第2回 4/18 14:00-	Carina Heinreichsberger (Universität Wien)	Terrestrial or Gaseous? A classification of exoplanets according to density, mass and radius
前期第3回 4/25 14:00-	Kazunari Iwasaki	Chemistry in Debris Disks
前期第4回 5/16 14:30-	Yuhito Shibaike (Tokyo Tech)	A new formation scenario for the Galilean satellites	14:30
前期第5回 5/23 14:00-	Yuji Matsumoto (ASIAA)	The orbital stability of planets in resonances considering the evolution of mass ratio

4/18 Carina Heinreichsberger, Terrestrial or Gaseous? A classification of exoplanets according to density, mass and radius: When looking at Exoplanet Archives the class of a planet is not given. Therefore I tried to find an easy and fast way to classify exoplanets using only density, mass and radius. In this talk I will discuss the formation theory of Planets to explain the boundaries between the different classes (gas, terrestrial) and show the results of my empirical study.

5/16 Yuhito Shibaike, A new formation scenario for the Galilean satellites: It is generally accepted that the four major (Galilean) satellites formed out of the gas disk that accompanied Jupiter’s formation. I will discuss a new formation scenario for the Galilean satellites, based on the capture of several planetesimal seeds and subsequent slow accretion of pebbles. Our slow-pebble-accretion scenario can reproduce the following characteristics: (1) the mass of all the Galilean satellites; (2) the orbits of Io, Europa, and Ganymede captured in mutual 2:1 mean motion resonances; (3) the ice mass fractions of all the Galilean satellites; (4) the unique ice-rock partially differentiated Callisto and the complete differentiation of the other satellites.