Observations of the Optical Transient in NGC 300 with AKARI/IRC: Possibilities of Asymmetric Dust Formation

@article{Ohsawa2010ObservationsOT,
  title={Observations of the Optical Transient in NGC 300 with AKARI/IRC: Possibilities of Asymmetric Dust Formation},
  author={Ryou Ohsawa and Itsuki Sakon and T. Onaka and M. Tanaka and Takashi J. Moriya and Takaya Nozawa and Keiichi Maeda and Ken’ichi Nomoto and Nozomu Tominaga and Fumihiko Usui and Hideo Matsuhara and Takao Nakagawa and Hiroshi Murakami},
  journal={The Astrophysical Journal},
  year={2010},
  volume={718},
  pages={1456-1459}
}
We present the results of near-infrared (NIR) multi-epoch observations of the optical transient in the nearby galaxy NGC 300 (NGC 300-OT) at 398 and 582 days after the discovery with the Infrared Camera (IRC) on board AKARI. NIR spectra (2-5 μm) of NGC 300-OT were obtained for the first time. They show no prominent emission nor absorption features, but are dominated by continuum thermal emission from the dust around NGC 300-OT. NIR images were taken in the 2.4, 3.2, and 4.1 μm bands. The… Expand

Figures and Tables from this paper

The Photometric and Spectral Evolution of the 2008 Luminous Optical Transient in NGC 300
The 2008 optical transient in NGC 300 is one of a growing class of intermediate-luminosity transients that brighten several orders of magnitude from a previously optically obscured state. The originExpand
Dust to Dust: Three Years in the Evolution of the Unusual SN 2008S
We obtained late-time optical and near-IR imaging of SN 2008S with the Large Binocular Telescope, near-IR data with the Hubble Space Telescope, and mid-IR data with the Spitzer Space Telescope. WeExpand
Dust to Dust
We obtained late-time optical and near-IR imaging of SN 2008S with the Large Binocular Telescope, near-IR data with the Hubble Space Telescope, and mid-IR data with the Spitzer Space Telescope. WeExpand
The SN 2008S Progenitor Star: Gone or Again Self-Obscured?
We obtained late-time optical and near-IR imaging of SN 2008S with the Large Binocular Telescope (LBT). We find that (1) it is again invisible at optical (UBVR) wavelengths to magnitude limits ofExpand
Almost gone: SN 2008S and NGC 300 2008OT-1 are fainter than their progenitors
We present late-time Hubble and Spitzer Space Telescope imaging of SN 2008S and NGC 300 2008OT-1, the prototypes of a common class of stellar transients whose true nature is debated. Both objects areExpand
DUSTY EXPLOSIONS FROM DUSTY PROGENITORS: THE PHYSICS OF SN 2008S AND THE 2008 NGC 300-OT
SN 2008S and the 2008 NGC 300-OT were explosive transients of stars self-obscured by very dense, dusty stellar winds. An explosive transient with an unobserved shock breakout luminosity of orderExpand
The Blue Supergiant Progenitor of the Supernova Imposter AT 2019krl
Extensive archival Hubble Space Telescope, Spitzer Space Telescope, and Large Binocular Telescope imaging of the recent intermediate-luminosity transient, AT 2019krl in M74, reveal a bright opticalExpand
Unmasking the Supernova Impostors
The canonical picture of a supernova impostor is a short (~months) –11 MV –14 optical transient from a massive (M * 40 M ☉) star during which the star ejects a dense shell of material. Dust formed inExpand
The Carnegie Supernova Project II
We present optical and near-infrared photometry and spectroscopy of the Type IIn supernova (SN) 2014ab, obtained by the Carnegie Supernova Project II (CSP-II) and initiated immediately after itsExpand
The Carnegie Supernova Project II
We present multi-wavelength observations of two gap transients followed by the Carnegie Supernova Project-II and supplemented with data obtained by a number of different programs. Here in the firstExpand

References

SHOWING 1-10 OF 21 REFERENCES
A Spitzer/IRS Spectrum of the 2008 Luminous Transient in NGC 300: Connection to Proto-Planetary Nebulae
We present a Spitzer/IRS low-resolution mid-infrared spectrum (5-14 micron) of the luminous transient discovered in the nearby galaxy NGC 300 in May 2008. The spectrum, obtained three months afterExpand
An Intermediate Luminosity Transient in NGC 300: The Eruption of a Dust-Enshrouded Massive Star
We present multi-epoch high-resolution optical spectroscopy, UV/radio/X-ray imaging, and archival Hubble and Spitzer observations of an intermediate luminosity optical transient recently discoveredExpand
The 2008 luminous optical transient in the nearby galaxy NGC 300
A luminous optical transient (OT) that appeared in NGC 300 in early 2008 had a maximum brightness, M_V ~ -12 to -13, intermediate between classical novae and supernovae. We present ground-basedExpand
VLT spectropolarimetry of the optical transient in NGC 300 - Evidence of asymmetry in the circumstellar dust
Aims. We study possible signs of asymmetry in the bright optical transient in NGC 300, to obtain independent information about the explosion mechanism, the progenitor star and its circumstellarExpand
PROPERTIES OF NEWLY FORMED DUST BY SN 2006JC BASED ON NEAR- TO MID-INFRARED OBSERVATION WITH AKARI
We present our latest results on near- to mid-infrared (MIR) observation of supernova (SN) 2006jc at 200 days after the discovery using the Infrared Camera (IRC) on board AKARI. The near-infraredExpand
The evolution of the infrared emission from the Type II supernova 1980k in NGC 6946 - The dust formation model
The paper presents 1-4 micron photometry of supernova 1980 k in NGC 6946 obtained over a period of 1 year following the outburst. During the period between 1980 November 1 and December 19, theExpand
AKARI observations of the ISM in our Galaxy and nearby galaxies
Abstract With AKARI, we have systematically performed near- to far-infrared (NIR–FIR) observations of the interstellar medium (ISM) in our Galaxy and nearby galaxies as one of AKARI mission programsExpand
CENSUS OF SELF-OBSCURED MASSIVE STARS IN NEARBY GALAXIES WITH SPITZER: IMPLICATIONS FOR UNDERSTANDING THE PROGENITORS OF SN 2008S-LIKE TRANSIENTS
A new link in the causal mapping between massive stars and potentially fatal explosive transients opened with the 2008 discovery of the dust-obscured progenitors of the luminous outbursts in NGC 6946Expand
A NEW CLASS OF LUMINOUS TRANSIENTS AND A FIRST CENSUS OF THEIR MASSIVE STELLAR PROGENITORS
The progenitors of SN 2008S and the 2008 luminous transient in NGC 300 were deeply dust-enshrouded massive stars, with extremely red mid-infrared (MIR) colors and relatively low bolometricExpand
Massive stars exploding in a He-rich circumstellar medium – III. SN 2006jc: infrared echoes from new and old dust in the progenitor CSM
We present near- (NIR) and mid-infrared (MIR) photometric data of the Type Ibn supernova (SN) 2006jc obtained with the United Kingdom Infrared Telescope (UKIRT), the Gemini North Telescope and theExpand
...
1
2
3
...