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Early Formation of Dust in the Ejecta of Type Ib SN 2006jc and Temperature and Mass of the Dust

Onaka, Takashi; Sakon, Itsuki; Tominaga, Nozomu +8 more

SN 2006jc is a peculiar supernova (SN), in which the formation of dust has been confirmed at an early epoch of ~50 days after the explosion. We investigate the possibility of such an early formation of dust grains in the expanding ejecta of SN 2006jc, applying the Type Ib SN model that is developed to reproduce the observed light curve. We find th…

AKARI Near-Infrared Spectroscopy: Detection of H₂O and CO₂ Ices toward Young Stellar Objects in the Large Magellanic Cloud

Onaka, Takashi; Ita, Yoshifusa; Sakon, Itsuki +4 more

We present the first results of AKARI Infrared Camera near-infrared spectroscopic survey of the Large Magellanic Cloud (LMC). We detected absorption features of the H₂O ice 3.05 µm and the CO₂ ice 4.27 µm stretching mode toward seven massive young stellar objects (YSOs). These samples are for the first time spectr…

A Massive-Star-forming Infrared Loop around the Crab-like Supernova Remnant G54.1+0.3: Post-Main-Sequence Triggered Star Formation?

Lee, Jeong-Eun; Onaka, Takashi; Koo, Bon-Chul +6 more

We report the discovery of a star-forming loop around the young, Crab-like supernova remnant (SNR) G54.1+0.3 using the AKARI infrared satellite. The loop consists of at least 11 young stellar objects (YSOs) embedded in a ringlike diffuse emission of radius ~1'. The YSOs are bright in the mid-infrared and are also visible in the Spitzer Space Teles…

Number Density Evolution of K_s-Band-Selected High-Redshift Galaxy Populations in the AKARI North Ecliptic Pole Field

Oyabu, Shinki; Matsuhara, Hideo; Takagi, Toshinobu +5 more

We present the number counts of K_s-band-selected high-redshift galaxy populations such as extremely red objects (EROs), B-, z-, and K-band-selected galaxies (BzKs) and distant red galaxies (DRGs) in the AKARI NEP field. These high-redshift galaxy samples are extracted from a multicolor catalog combining optical data from Suprime-Cam on …