Hatena::Groupkanatatmp

KANATA ObsLog

2009-09-27

[] Optical transient in UGC 2773 ; update

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We update the light curve of optical transient in UGC 2773.

2009-09-26

[] SN 2009im : secondary maximum in I-band

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We show the I-band light curve of subluminous Type Ia SN 2009im, comparing with subluminous SN 2005bl and transient type Ia SN 2004eo. The secondary maximum is seen in I-band maximum, which is a rare phenomena for subluminous SNe Ia.

[] SN 2009ig : B-band excess ?

f:id:kanataobslog:20090927011639p:image

We update the light curve of Type Ia SN 2009ig. The B-band light curve indicates the very slow evolution after maximum. But V-band and R-band light curves are well consistent with those of typical Ia SN 2005cf. Moreover, the secondary maximum of SN 2009ig is clearly different from typical SN 2005cf. Such a phenomena is rare for a SN Ia. The B-band excess seen in several Type Ia SNe may be related the interaction with a circumstellar material. We will continue our observation.

2009-09-21

[] V5583 Sgr : optical spectra

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We obtained optical spectra of V5583 Sgr on 2009 Sepetember 15. Blended lines around 5000A (FeII + [O III] ?) slightly developed in recent two weeks.

[] V1280 Sco : Optical spectrum

f:id:kanataobslog:20090921125929p:image

We obtained an optical spectrum of V1280 Sco on 2009 September 15. The spectrum still shows a strong continum emission. Balmer and FeII emissions were also strong. No nebular or coronal lines were seen in our spectra. These results imply that outflows continue from a WD surface and optically thick layers might be formed even at ~1000 days after the explosion.

2009-09-18

[] 3C 66A : Rising the polarization degree

f:id:kanataobslog:20090919013923p:image

We show the light curve and the temporal variation of the polarization degree of the object in V band. The polarization degree was rising, and reached to about 20%. The object was V~14.3.

[] 3C 454.3 : Brightening up

f:id:kanataobslog:20090919013157p:image

Fermi team reported that the object was in high state in gamma-ray region. The object in optical band was also brightening up. We show the light curve in V band, in which the magnitude was corrected the reddening, and the V-J color variation.

[] PKS 2155-304 : Faded

f:id:kanataobslog:20090918210326p:image

The figure shows the light curve in V band and V-J color variation of the object. The object has recently been faded. The object seems to show the "bluer-when-brighter" trend associated with the short term flare.

[] QSO 0133+476 (MisV1436) : faint state and decreasing polarization degree

f:id:kanataobslog:20090918195853p:image

We update the data of the blazar QSO 0133+476. The object was faint (V~16.7). The polarization degree kept decreasing from 40%.

[] V1280 Sco : update

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We update optical and near-infrared light curves of a long burning nova, V1280 Sco. The decline trend continues in V and J bands. 

2009-09-17

[] QSO 0133+476 : faded

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The object has been faded from 15.5 to 16.7 in V band. The polarization degree also decreased to 17%.

[] 3C 66A : Update the data

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The figure shows the light curve of 3C 66A and the temporal variation of the polarization degree in V band. The polarization degree of the object rose and was about 18%.

[] SN 2009ig : update

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We update the light curve of Type Ia SN 2009ig. The decline rate of B-band light curve is compared with those of a typical Type Ia SN 2005cf (Wang et al. 2009) and most luminous Type Ia SN 2009dc (Yamanaka et al. 2009). We suggest that SN 2009ig is classified into over-luminous SNe Ia as SN 1991T-like. We will continue this object.

[] 3C 454.3 : Update the data

f:id:kanataobslog:20090917204133p:image

f:id:kanataobslog:20090917204130p:image

These figures show the light curve, the V-J color variation and the temporal variation of the polarization degree in V band. In Sep 15, 2009, the object was bright in gamma-ray region (ATel #2200). The V-J has recently become red compared with that around JD 2455000. The polarization degree has been variable between 0% and 12% for the last 130 days.

2009-09-16

[] Optical transient in UGC 2773 ; update

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We update the light curve of an optical transient in UGC 2773.

[] SN 2009im : update

f:id:kanataobslog:20090916222021p:image

We update the light curve of Type Ia SN 2009im. The I-band light curve show the start of secondary maximum.

[] SN 2009ig : slow decline

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We update the light curve of Type Ia SN 2009ig. The decline rate of this SN may be slower than that of typical SN 2005cf.

2009-09-15

[] V5583 Sgr : Update optical spectra

f:id:kanataobslog:20090915092007p:image

We update our spectra of V5583 Sgr. The latest spectrum was so noisy because of low altitudes(< 15 deg) of the object during our observation. The spectral features mostly unchanged comparing with that on 1st Sep. 2009.

2009-09-13

[] QSO 0133+476 (MIsV1436) ; Update the data

f:id:kanataobslog:20090913165527p:image

The figure shows the light curve and the temporal variation of the polarization degree in V band. The object has recently been around V~15.8. The polarization degree reached to about 40%.

[] 3C 454.3 : Update the data

f:id:kanataobslog:20090913164634p:image

3C 454.3 has recently been bright, and reached V~14.5. The polarization degree was reached about 11 %.

2009-09-11

[] SN 2009ig : comparing with typical Ia SN 2005cf

f:id:kanataobslog:20090911233820p:image

We update the light curve of Type Ia SN 2009ig. We compared the light curve with those of SN 2005cf (Wang et al. 2009). The multi color light curve of two different SNe is well similar. Thus, we suggest that SN 2009ig is a typical SN Ia, although extremely high velocity line of SiII6355 is detected in very early phase (CBET 1918). Such a fact indicate that most of typical SNe Ia might have commonly a high velocity (> 20,000km/s) region in the outermost layer.

2009-09-10

[] Optical transient in UGC 2773 ; update

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We update the light curve of Optical transient in UGC 2773.

[] SN 2009im : update

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We update the light curve of sub-luminous Type Ia SN 2009im.

[] SN 2009ig : update

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We update the light curve of Type Ia SN 2009ig. The brightness has been at around maximum. The broad maximum light is consistent with that in over-luminous SNe Ia, as SN 1991T-like object.

2009-09-08

[] Optical transient in UGC 2773 ; update

f:id:kanataobslog:20090908162042p:image

we update the light curve of anomalous optical transient in UGC 2773.

[] SN 2009im : start of rebrightening in I-band

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We update the light curve of sub-luminous Type Ia SN 2009im. The I-band luminosity of this object undergo rebrightening. The secondary peak of I-band for a sub-luminous SN Ia is weaker than normal Type Ia. Fainter SNe Ia would be expected the earlier and fainter secondary maximum of I-band.

[] SN 2009ig : update

f:id:kanataobslog:20090908160057p:image

We update the light curve of Type Ia SN 2009ig.

2009-09-07

[] Optical transient in UGC 2773 ; update

f:id:kanataobslog:20090907200013p:image

We update the light curve of optical transient in UGC 2773.

[] SN 2009im : decline of the brightness

f:id:kanataobslog:20090907194738p:image

We update the light curve of Type Ia SN 2009im. The brightness has been decreased.

[] SN 2009ig : after maximum

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We update the light curve of Type Ia SN 2009ig. The brightness has been after the maximum.

2009-09-06

[] Optical transient in UGC 2773 ; plataeu phase?

f:id:kanataobslog:20090907010116p:image

We present the preliminary light curve of possible extragalactic optical transient in UGC 2773.

[] SN 2009ig : reached around maximum

f:id:kanataobslog:20090907005103p:image

We update the light curve of Type Ia SN 2009ig. The brightness reached around the maximum light.

2009-09-05

[] V5583 Sgr : NIR light curves

f:id:kanataobslog:20090906011757p:image

We update preliminary results of J and H-band photometry.

The decline rate in J-band is about 0.06 mag/day in recent 12 days.

2009-09-03

[] V5583 Sgr : Optical spectra of V5583 Sgr

f:id:kanataobslog:20090904003838p:image

We update optical spectra of V5583 Sgr. Relative Intensities of Emission lines gradually increase. No nebular lines are seen.

[] PSN in UGC 2773

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We start photometric observations of possible SN in UGC 2773. The new transient was discovered on Aug 18.02 in UGC 2773 (CBET 1931). ).UGC 2773 is a low luminosity galaxy, and its distance modulous is roughly as ~28.5 (from NED). Considering the reddening of Galaxy (Av~1.8 mag), the roughly estimated absolute magnitude is derived as ~-11.9mag. We will continue the observation of this exciting conspicuous object!

[] SN 2009im in S0 galaxy NGC 1355

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We update the light curve of sub-luminous Type Ia SN 2009im. The brightness

has already finished.

[] SN 2009ig : still before maximum

f:id:kanataobslog:20090903211920p:image

We update the light curve of Type Ia SN 2009ig. The brightness do not still reach maximum light.

[] V2672 Oph : NIR light curve

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We updated NIR light curve of V2672 Oph.

[] V5583 Sgr : NIR light curves

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We updated NIR light curves with results obtained on September 1st. The decline trend continues in J and H. No evidence of the dust formation was seen from our light curves.

2009-09-02

[] QSO 0133+476 (MIsV1436) ; high polarization degree

f:id:kanataobslog:20090903051533p:image

We update the data of the object. The polarization degree was as high as 33 % in V band.

[] SN 2009im : after maximum

f:id:kanataobslog:20090902203923p:image

We update the light curve of Type Ia SN 2009im. We showed that the brightness reached around the peak. This object would be sub-luminous event (Ayani et al. 2009, CBET 1934). .

[] SN 2009ig : maximum will come soon

f:id:kanataobslog:20090902202012p:image

We update the light curve of Type Ia SN 2009ig. SN 2009ig would be spectroscopically classified as over-luminous SN 1991T-like (private communication from Kinugasa). The absolute luminosity is roughly consistent with such a spectroscopic result.

2009-09-01

[] SN 2009dc : Late phase light curve

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We update the light curve of Type Ia SN 2009dc.

[] SN 2009im in S0 galaxy NGC 1355

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We have started the photometric observations of SN 2009im. This SN have not been classified by spectroscopic observations yet.

[] SN 2009ig : still brightening

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We update the light curve of Type Ia SN 2009ig.