Hatena::Groupkanatatmp

KANATA ObsLog

2009-10-31

[] Type II SN 2009js : update

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We update the light curve of Type II SN 2009js. The R and I-band light curve indicate the plateau.

Optical transient in UGC 2773 ; update

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We update the light curve of an optical transient in UGC 2773. The light curve have been at the plateau phase.

[] Type Ia SN 2009ig : B-band excess?

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We update the light curve of Type Ia SN 2009ig. The B-band light curve indicates that the excess is seen at 40days after B-band maximum date, comparing with that of typical SNe Ia. The excess of the B-band light curve may be affected by a light echo from an interaction between a light from SN and a circumstellar material. We will continue this object.

[] Type Ia SN 2009kk : already afterm maximum

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We update the light curve of Type Ia SN 2009kk. The preliminary photometric results are obtained from the magnitude of comparison star from USNO-B 1.0 catalog. The light curve show that the luminosity already have been after maximum. We will continue the observations of this object.

2009-10-29

[]PKS 2155-304 : Faint state

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We update the light curve in V band and V-J color variation of the object. The object has recently been faint. The V-J color has not changed.

[]S5 0716+714 : Update the data

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The figure shows the light curve and the temporal variation of the polarization degree of the object in V band. The object was bright in JD~2455115 for 40 days, V=12.8. The polarization degree of the object was high in JD~2455127, P=15 %. The object has recently been in high state in the polarization degree, higher than 10 %.

2009-10-28

Optical transient in UGC 2773 ; update

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

[] Observations start of Type II SN 2009js : rapidly fading in B-band

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We show the light curve of Type II Supernova 2009js. The B-band magnitude rapidly began to fading. On the other hand, Rc and Ic band magnitude show few variation. These preliminary photometric results indicate that the photosphere of this SN rapidly expands and the temperature becomes cool.

[] Nova in M31 2009-10b : update

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We update the light curve of Nova in M31 2009 10b.

2009-10-27

[] Type Ia SN 2009kk

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We have started the photometric observations of Type Ia SN 2009kk. This SN was discovered by CSS (Catalina Sky Survey) at 2009 Oct. 15.41 UT. Our preliminary photometric results are obtained using USNO-B1.0 catalog. We will continue the observation for this object.

[] Type Ia SN 2009ig : update

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

[] Nova in M31 2009-10b : fast decline

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We update the light curve of Nova in M31 2009-10b.

[]QSO 0133+476 (MisV1436) : Update the data

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The figure shows the light curve and temporal variation of the Polarization degree of the object in V band.

[] 3C 66A : Continue to rise

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The figure shows the light curve and the temporal variation of the polarization degree in V band. The flux of the object continued to rise. There seems to be anti-correlation between the flux and the polarization degree.

2009-10-26

[] Type II SN 2009js : fast decline in B-band

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We update the light curve of Type II SN 2009js. The light curves show the rapid decline in B-band and slow decline in V-band. In R and I band, the variations of the light curve have kept the luminosity since the maximum. Such a phenomena is commonly seen in Type II plateau supernovae. We continue the observations.

2009-10-25

[] Nova in M31 2009-10b : low decline rate

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We update the light curves of Nova in M31 2009-10b. The decline rate of the light curve indicates the very low for a nova confirmed in galaxy M31. According to the correlation the decline rate and the intrinsic peak luminosity (MMRD; Della Valle & Livio 1995, Downes & Duerbeck 2000), the peak luminosity of this nova is expected as ~-10 mag. It is well corresponding to the absolute magnitude estimated from the data obtained our first photometry. Due to the decreasing the luminosity of Nova in M31-2009-10b, the relative strength of the luminosity from the galactic component in M31 become the strong. It will make the our photometric observations difficult without a subtracting the light from the background of M31.

2009-10-23

[] 3C 454.3 : Rising of the polarization degree

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The object was bright in gamma-ray and optical range reported in ATel (#2200, 2201). The polarization degree of the object has recently risen. The polarization degree of the object reached 14 %.

[] 3C 66A : bright

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We have kept the monitoring of 3C 66A since Jul. 9, 2008. The figure shows the light curve in V band and V-J color variation in this period. The object has recently been brightened. The flux in this day is the brightest data in our 2-year monitoring. The object showed the feature of bluer-when-brighter trend.

[] OJ 287 : faded

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These figures show the light curve in V band, V-J color variation and temporal variation of the polarization degree in V band. The object has been faded since JD 2455126. The V-J color became redder, when the object was faded. This feature is called as bluer-when-brighter, which is the popular feature in blazars. The object showed the anticorrelation between the flux and the polarization degree.

2009-10-22

[] Nova in M31 2009-10b : fast decline !

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We update the light curve of M31 N 2009-10b. The luminosity decreased further than that measured at Oct.20. The decline rate of this nova would be one of the fastest decline novae discovered in M31. We will continue the photometric observations.

[] RX J1542.8+6129? : bright

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The figure shows the light curve in V band and V-J color variation. The object has been bright, and reached V~14.6 mag. V-J color became bluer when the object was bright.

[] OJ 287 : brightening !

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We performed the photopolarimetric observation in OJ 287. The figure shows the light curve and the temporal variation of the polarization degree in V band. The object has recently brightened since JD 2455100 , and reached about V~14. The polarization degree in JD 2455126 was lower than that in JD 2455120. Compared with the data in previous day, polarization degree in JD 2455126 was lower, and the amplitude of the polarization degree was about 12 %.

2009-10-21

[] Nova in M31 2009-10b : fast decline !

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We update the light curve of Nova in M31 2009-10b. We found that the luminosity has rapidly decreased by ~16.5 mag in V-band. The color became redder than that of first photometry. Especially, the R-band luminosity slightly become strong relative to those of B and V band. We encourage the spectroscopic observations!

2009-10-20

[] Type II SN 2009js : update

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We update the light curve of Type II SN 2009js.

[] Type Ia SN 2009ig : update

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

2009-10-19

[] Nova in M31 2009-10b : observations start

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We have started the multicolor photometric observations of the extragalactic nova M31 2009 10b. This nova was discovered of 16.4 mag at 2009 Oct. 11.414 by K. Itagaki (CBET 1971). Thereafter, Itagaki has continued the CCD observations and derived as unfiltered magnitude of 15.0 mag on Oct. 14.587 and 14.751 UT (three days after discovery) (CBET 1973). We derived the V-band magnitude as ~15.0+/-0.5 mag at Oct. 18.6 (seven days after discovery), using the magnitude of the comparison star from SIMBAD database. Although, there is an uncertainty determining the observed magnitude, we find that the evolutions of the luminosity might be slow. The spectroscopically observational result were also reported by H, Yamaoka (CBET 1980). The observations also were performed at Oct. 15.6 and Oct. 15.5 (four days after discovery) by K, Ayani, Bisei Astronomical Observatory (BAO) and S. Honda and K. Kinugasa, Gunma Astronomical Observatory (GAO). The spectra show a featureless blue continuum and the P-Cyg profiles with narrow emission lines of Balmar series. They resemble the peculiar dust nova V1280 Sco (CBET 1980, IAUC 8803). If Nova in M31 2009-10b is a V1280 Sco-like object, we expected the increasing an infrared emission with rapidly declining of an optical one. We will continue the multi-color photometric observations of this nova, using KANATA telescope.

2009-10-18

[] Optical transient in UGC 2773 ; update

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We showed the light curve of the optical transient of UGC 2773. Smith et al. (2009) purposed that the origin of this optical transient should be from the luminous blue variables (LBVs). The spectra show the forest of the narrow emission and absorption lines, which is similar to those seen in the spectra of S Dor in the cool state, but also show the [CaII] emissions and infrared excess emissions. These observational facts would support that this object is the LBV (Smith et al. 2009). If this object is the LBV, the luminosity rapidly would decrease with time. In order to confirm whether such a phenomena occur, we will continue the photometry.

[] Observations start of Type II SN 2009js

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We have performed the photometric observations for SN 2009js, which is newly discovered at 2009 Oct. 11.44 by K. Itagaki and LOSS (CBET 1969). The spectroscopic observation was performed by Silverman et al. 2009 (CBET 1969). The spectral profile was similar to that of SN 2005cs, and SN 2009js was classified into Type II SN. The SN would be heavily suffered the reddening from the dust in host galaxy, or this SN show that the luminosity may be intrinsically faint and the color be red. We will continue the photometric observations.

2009-10-16

[] Type Ia SN 2009ig : update

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

2009-10-15

[] SN 2009ig : update

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

2009-10-14

[] SN 2009ig : update

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We update the light curve of Type Ia SN 2009ig. The secondary peak of the I-band light curve is slower than that of SN 2005cf. It is corresponding to the slower decline rate of the B-band light curve.

2009-10-13

[] SN 2009ig : slow evolution

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We update the light curve of Type Ia SN 2009ig. The multi color light curve indicate the slower evolutions than those of typical SN 2005cf. The decline rate of B-band light curve is especially low. It indicates that SN 2009ig would be classified into the over-luminous SNe Ia like SN 1991T.

2009-10-04

[] 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.

[] Observations start of Type Ib SN 2009jf

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We started the BVRcIc-band photometric observations of SN 2009jf. SN 2009jf was discovered in NGC 7479 on Sep. 27.33 by Lick Observatory Supernova Search (CBET 1952). Thereafter, spectroscopic observations of for this SN was performed by Kasliwal et al. and Sahu et al.(CBET 1955). The HeI absorptions line was seen and the line velocity of reached 16,000 km/s. Thus, this SN was classified as young Type Ib SN. The spectral profile would resemble that in Type Ib 1999ex around maximum. Itagaki et al. have already discovered optical transient at 18.3 mag on 2007 Aug. 13.74. and at 18.2 mag on 2006 Nov. 8.4 (CBET 1955), which suggest that this optical transient may be the luminous blue variable. we obtained the V-band magnitude as ~ 16 mag using the magnitude of comparison star from USNO catalogue. It indicates that the luminosity of SN 2009jf increases comparing the that obtained in discovery image. We will continue this object.

2009-10-02

[] V455 And: high-speed photometry

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We performed high-speed photometry of the dwarf nova, V455 And on 23 Sep with a time-resolution of 5 sec. The upper and lower panel show the light curve and power spectrum, respectively. In the light curve, the vertical dotted lines indicate the orbital period of V455 And (~4865 s). As can be seen in the power spectrum, a sharp spike at 0.01484 Hz (67.39 s) is present, which is probably a spin period of the white dwarf. Another noteworthy feature is a signal around 0.003516 Hz (~284.4 s). The overall feature of the light curve is analogous to that observed before the outburst (Araujo-Betancor et al. 2005)