(Proposal ID) S15A-007

(PI) Honda, Mitsuhiko

(Proposal Title)
 MIR imaging of the transitional disk source Oph IRS48

(Abstract)
We propose to make 25 mum mid-infrared imaging of the transitional disk around 
the young star Oph IRS 48 to derive the temperature of the emitting dust in 
this disk. Recently, ALMA observation revealed the apparent difference of the 
infrared (18.7 mum) and radio (440 mum) dust continuum of this system and 
implied that the large mm-sized grains are trapped and accumulated to the 
local pressure maximum, which may eventually form planetesimals/planets. 
However, there can be other explanations to such apparent difference in the 
different wavelengths. To verify such interpretation, new 25 mum imaging can 
provide some clues, since it is the wavelength between the previous 18.7 mum 
and the 440 mum observations. Furthermore, multi-wavelength study of the disk 
is a natural step towards detailed understanding of disk structure, and new 25 
mum image can be complemental to forthecoming ALMA and NIR polarimetric data.