[vsnet-alert 12006] SDSS J090350.73+330036.1: eclipsing SU UMa-type dwarf nova in superoutburst

[Taichi Kato]

SDSS J090350.73+330036.1: eclipsing SU UMa-type dwarf nova in superoutburst

   Message from Enrique de Miguel Agustino.  I have basically confirmed
the finding.

Date: Wed, 26 May 2010 02:18:19 +0200
From: Enrique de Miguel Agustino <demiguel at uhu.es>

The data seem to suggest that the humps and the eclipses
do not occur in phase, with the former having a periodicity
2.8% larger than the orbital period. This may suggest that
this system is undergoing a superoutburst, and that the system
may therefore be of the UGSU+E subtype rather than a UG+E
system. Further data and analysis are needed.

---

Comments:     Very cloudy by the begining of the time series (missed first
              eclipse) but getting better as the run proceeds, allowing
              to capture the second eclipse. 
              On average, the system is 0.31 mags fainter than yesterday.
              Once again, the light curve differs from previous nights.
              Today, it seems that the humps take place AFTER the eclipse
              and not before as seen yesterday. From inspection of the
              light curves, it seems that the humps and the eclipses
              do not occur in phase, the periodicity of the humps
              being slightly larger. ANOVA and a PDM analysis yield
              both the same value of the period, 0.0607(3) d, which is
              2.8% LARGER than the orbital period. This appears to be
              consistent with the system being undergoing a superoutburst
              with P_sh=0.0607(3) d. Note that the mean periodicity
              has increased from the value 0.0595(3) found yesterday
              (consistent with a positive Pdot). 
       
                 Eclipse timing:

              run    E      HJD
              01     0   2455340.38225(17)
                     1   2455340.44121(20)
              02    17   2455341.38710(18)
                    18   2455341.44651(10)
              03    35   2455342.44915(7)

              A linear regression yields:

              HJD(min) = 2455340.3830(6) + 0.059040(25) * E