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)]...
M Matsuura   AA Zijlstra   JT van Loon   Yamamura, I   AJ Markwick   PA Whitelock   PM Woods   Marshall, JR   MW Feast   LBFM Waters   
ASTRONOMY & ASTROPHYSICS 434(2) 691-706 2005年5月
The dependence of stellar molecular bands on the metallicity is studied using infrared L- band spectra of AGB stars ( both carbon- rich and oxygen- rich) and M- type supergiants in the Large and Small Magellanic Clouds ( LMC and SMC) and in the Sa...
T Le Bertre   M Tanaka   Yamamura, I   H Murakami   DJ MacConnell   
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 117(828) 199-206 2005年2月
We have identified 139 cool carbon stars in the near-infrared spectrophotometric survey of the Infrared Telescope in Space (IRTS) from the conspicuous presence of molecular absorption bands at 1.8, 3.1, and 3.8 mum. Among them, 14 are new bright (...
Sakon, I   T Onaka   D Ishihara   T Ootsubo   Yamamura, I   T Tanabe   TL Roellig   
ASTROPHYSICAL JOURNAL 609(1) 203-219 2004年7月
We present the results of observations of the unidentified infrared (UIR) bands in the diffuse Galactic emission across the Galaxy by the Mid-Infrared Spectrometer (MIRS) on board the Infrared Telescope in Space (IRTS). While previous studies on t...