Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

P (Space and Planetary Sciences) » P-CG Complex & General

[P-CG22] New Developments of Planetary Sciences with ALMA

Wed. May 23, 2018 10:45 AM - 12:15 PM A02 (Tokyo Bay Makuhari Hall)

convener:Takayuki Muto(Division of Liberal Arts, Kogakuin University), Munetake Momose(The College of Science, Ibaraki University), Hideo Sagawa(京都産業大学理学部, 共同), Masumi Shimojo(National Astronomical Observatory of Japan), Chairperson:Sagawa Hideo

11:30 AM - 11:45 AM

[PCG22-09] Spatially Resolved Sub-millimeter Continuum Imaging of Neptune's Upper Troposphere with ALMA: a New Constraint on the Global Atmospheric Circulation

*Takahiro IINO1 (1.Nature and Science Museum, Tokyo University of Agriculture and Technology)

Keywords:ALMA, Planetary atmosphere, Solar system

In this presentation, we report the analysis result of Neptune's continuum emission obtained from the ALMA archive. Neptune's south pole has exhibited a brightness temperature excesses both by mid-IR and cm observations. To constraint whether the excesses are due to the hot air parcel heated by chemical processes or the adiabatic heating, or to the variation of the molecular opacities, we analysed a sub-mm continuum observation data obtained with ALMA in August 2012. The observation was carried out with 646 GHz center frequency and with 12 antennaes. From the radiative transfer analysis considering CIA opacities of H2 and He, it was concluded that the observation probes the upper troposphere mainly. No clear hot spot that exceeds 2.1 K in the brightness temperature scale was found out, whereas the mid-IR and cm excesses were as high as 7 to 30 K.