(Proposal ID) S14B-140

(PI) Honda Mitsuhiko

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

(Abstract)
We propose to make 25 micron 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 micron) and radio (440 micron) 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 micron imaging 
can provide some clues, since it is the wavelength between previous 18.7 
micron and 440 micron observations. Furthermore, multi-wavelength study of 
the disk is a natural step towards detailed understanding of disk structure, 
and new 25 micron image can be complemental to forthecoming ALMA and NIR 
polarimetric data.