PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 69(1) 2017年2月 [査読有り]
We present a general surface brightness correction method for compact extended sources imaged in the slow-scan pointed observation mode of the Far-Infrared Surveyor (FIS) aboard the AKARI infrared astronomical satellite. Our method recovers correc...
The detection of the CO2 absorption band at 4.2 mu(m) in brown dwarf spectra by AKARI has made it possible to discuss CO2 molecular abundance in brown dwarf atmospheres. In our previous studies, we found an excess in the 4.2 mu m CO2 absorption ba...
S. Sorahana   I. Yamamura   H. Murakami   
Astrophysical Journal 767(1) 2013年4月 [査読有り]
We derive the radii of 16 brown dwarfs observed by AKARI using their parallaxes and the ratios of observed to model fluxes. We find that the brown dwarf radius ranges between 0.64-1.13 RJ with an average radius of 0.83 RJ . We find a trend in the ...
We investigate variations in the strengths of three molecular bands, CH4 at 3.3 mu m, CO at 4.6 mu m, and CO2 at 4.2 mu m, in 16 brown dwarf spectra obtained by AKARI. Spectral features are examined along the sequence of source classes from L1 to ...
We present the discovery of a source with broadband infrared photometric characteristics similar to Sakurai's object. WISE J180956.27-330500.2 (hereafter J1810-3305) shows very red WISE colors, but a very blue 2MASS [K] versus WISE [W1 (3.4 mu m)]...
S Wada   T Onaka   Yamamura, I   Y Murata   AT Tokunaga   
ASTRONOMY & ASTROPHYSICS 407(2) 551-562 2003年8月
We investigate carbon isotope effects on the infrared bands of a laboratory analogue of carbonaceous dust, the quenched carbonaceous composite (QCC), synthesized from a plasma gas of methane with various C-12/C-13 ratios. Peak shifts to longer wav...
S Wada   T Onaka   Yamamura, I   Y Murata   AT Tokunaga   
ASTRONOMY & ASTROPHYSICS 407(2) 551-562 2003年8月
We investigate carbon isotope effects on the infrared bands of a laboratory analogue of carbonaceous dust, the quenched carbonaceous composite (QCC), synthesized from a plasma gas of methane with various C-12/C-13 ratios. Peak shifts to longer wav...
T Le Bertre   M Tanaka   Yamamura, I   H Murakami   
ASTRONOMY & ASTROPHYSICS 403(3) 943-954 2003年6月
We are using the 2002 data-release from the Japanese space experiment IRTS to investigate the spatial distribution of galactic mass-losing (>2 x 10(-8) M-circle dot yr(-1)) AGB stars and the relative contribution of C-rich and O-rich ones to th...
T Le Bertre   M Tanaka   Yamamura, I   H Murakami   
ASTRONOMY & ASTROPHYSICS 403(3) 943-954 2003年6月
We are using the 2002 data-release from the Japanese space experiment IRTS to investigate the spatial distribution of galactic mass-losing (>2 x 10(-8) M-circle dot yr(-1)) AGB stars and the relative contribution of C-rich and O-rich ones to th...