[vsnet-campaign 1212] 1RXS J232953.9+062814: refined period

[Taichi Kato <tkato>]

1RXS J232953.9+062814: refined period

Dear Colleagues,

    We have further analyzed the Kyoto data.  We have also received new
data from T. Vanmunster (cf. vsnet-alert 6837).  Further analysis of the
Kyoto data yielded a period of 0.046 d (the analysis in vsnet-alert 6836
seems to have been affected by a sysmatic effect, because the initial
run likely missed the maximum of the first superhump).  Using Vanmunster's
data, we have refined the superhump period as 0.04633(2) d.

    Wonderful!!  We have discovered the second object that breaks the
"period mimimum".  The astrophysical implication is already given in
vsnet-alert 6836, written by Uemura et al.

    The VSNET Collaboration team chooses this object as the top priority
target (WZ Sge is still a priority target; we are following the target
with a second instrument).  Please observe as long as possible, as we
have done in our great campaign on WZ Sge!

Regards,
Taichi Kato
VSNET Collaboration team

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(from vsnet-alert 6836)

1RXS J232953.9+062814: strong humps with a very short period

    Our reduction of the last night data is now ongoing.  The preliminary 
light curve is very impressive.  We can see three humps with amplitudes 
of 0.3 - 0.4mag in our first 2.9 hours run.  Our period analysis 
yields the period of 0.04320(79) d.  The fast-rise slow-decline profile 
of these humps strongly indicates that these are superhumps.  
In this part of the light curve, the object rapidly faded with a rate of 
2 mag/day.  Confirmations of the current status of this object are 
very urged.

    The ~0.043 day period superhumps are the shortest one among hydrogen 
rich cataclysmic variables except for the SU UMa-type dwarf nova, V485 Cen. 
It is possible that the humps are double peaked and its real period is 
may be near the lower edge of the period gap.

    Anyway, it is certain that 1RXS J232953.9+062814 is very interesting 
and important object for the cataclysmic variable study.  Follow-up 
time-series observations are strongly encouraged.

Regards,
Makoto Uemura, Ryoko Ishioka, and Taichi Kato

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