Toshiya Ueta Rachael L. Tomasino Satoshi Takita Hideyuki Izumiura Mai Shirahata Andrew Fullard Issei Yamamura Shuji Matsuura
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...
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)]...
K. Matsuta P. Gandhi T. Dotani T. Nakagawa N. Isobe Y. Ueda K. Ichikawa Y. Terashima S. Oyabu I. Yamamura Stawarz
Astrophysical Journal 753(2) 2012年7月
We combine data from two all-sky surveys in order to study the connection between the infrared and hard X-ray (>10keV) properties for local active galactic nuclei (AGNs). The Swift Burst Alert Telescope all-sky survey provides an unbiased, flux-li...
Recent observations with the infrared astronomical satellite AKARI have shown that the CO2 bands at 4.2 mu m in three brown dwarfs are much stronger than expected from the unified cloudy model (UCM) based on recent solar C & O abundances. This res...
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