- vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 10223] SDSS J080249.06+363716.4 = ASASSN-23ic: new SU UMa-type dwarf nova
by Taichi Kato 27 Nov '23

27 Nov '23

SDSS J080249.06+363716.4 = ASASSN-23ic: new SU UMa-type dwarf nova Itoh-san reported observations. Although the object is currently faint (17 mag), superhumps and possible shallow eclipses were seen. The period is 0.05919(2) d. This period expresses superhumps well. Due to the limited coverage, possible eclipses fell at the same superhump phase and the orbital and superhump periods were not distinguished.

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[vsnet-newvar 10222] TCP J04251906+2841462: new WZ Sge-type dwarf nova
by Taichi Kato 22 Nov '23

22 Nov '23

TCP J04251906+2841462: new WZ Sge-type dwarf nova Kiyota-san reported observations. Early superhumps with a period of 0.0539(4) d and an amplitude of 0.07 mag were present.

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[vsnet-newvar 10221] TCP J19582065+5506531: new SU UMa-type dwarf nova
by Taichi Kato 16 Nov '23

16 Nov '23

TCP J19582065+5506531: new SU UMa-type dwarf nova The most recent observations by Itoh-san (Nov. 15) showed clear superhumps (period about 0.059 d). They were developing on Nov. 14.

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[vsnet-newvar 10220] TCP J20315286+2740166: ordinary superhumps
by Taichi Kato 16 Nov '23

16 Nov '23

TCP J20315286+2740166: ordinary superhumps Osaka Kyoiku U team, Kyoto U team, Itoh-san, Kiyota-san, Stephen Brincat and Tamas Tordai have reported observations. Ordinary superhumps started to appear on Nov. 12 and the current superhump period is 0.05694(7) d. The small amplitude 0.035 mag and the profile suggest that they are still in stage A.

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[vsnet-newvar 10219] TCP J20315286+2740166: likely early superhumps
by Taichi Kato 06 Nov '23

06 Nov '23

TCP J20315286+2740166: likely early superhumps Osaka Kyoiku U team, Itoh-san and Stephen Brincat have reported observations. There are likely early superhumps with a period of 0.0552(2) d and an amplitude of 0.035 mag. The baseline is still short and the result is preliminary.

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[vsnet-newvar 10218] TCP J18433189+1011051: new SU UMa star
by Taichi Kato 04 Nov '23

04 Nov '23

TCP J18433189+1011051: new SU UMa star According to Itoh-san's observations on Nov. 3, this object showed superhumps with a period of about 0.065 d.

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[vsnet-newvar 10217] PS1-3PI J063334.87-230546.4 = Gaia DR3 2924954955730613376 = TCP J06333486-2305449: SU UMa star
by Taichi Kato 04 Nov '23

04 Nov '23

PS1-3PI J063334.87-230546.4 = Gaia DR3 2924954955730613376 = TCP J06333486-2305449: SU UMa star According to Itoh-san's observations on Nov. 3, this object showed superhumps with an amplitude of 0.17 mag. The period of 0.0597(4) d excludes the possibility of an AM CVn star as I suggested earlier. The period was close to the half of this superhump period and the variations may have been early superhumps, though two maxima were almost equal. The nature will be clarified when a better measurement of the superhump period is obtained.

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[vsnet-newvar 10216] PS1-3PI J063334.87-230546.4 = Gaia DR3 2924954955730613376 = TCP J06333486-2305449: superoutburst from a most likely AM CVn star
by Taichi Kato 02 Nov '23

02 Nov '23

PS1-3PI J063334.87-230546.4 = Gaia DR3 2924954955730613376 = TCP J06333486-2305449: superoutburst from a most likely AM CVn star Kiyota-san, Itoh-san and Josch Hambsch have reported observations. The data show superhumps with a period of 0.02942(2) d. Amplitude 0.043 mag. The low amplitude seems to suggest a low mass ratio, consistent with an AM CVn star. The data are still somewhat insufficient and more observations are needed.

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[vsnet-newvar 10215] ASASSN-23gr: new SU UMa-type dwarf nova
by Taichi Kato 14 Oct '23

14 Oct '23

ASASSN-23gr: new SU UMa-type dwarf nova Josch Hambsch has reported observations. The data show superhumps with a period of 0.06345(5) d. The amplitude is rather small (0.04 mag) and may be still growing.

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[vsnet-newvar 10214] SwiftJ1727.8-1613: superhumps?
by Taichi Kato 23 Sep '23

23 Sep '23

SwiftJ1727.8-1613: superhumps? This X-ray transient looks like to have started showing superhumps. An analysis of the data since Sep. 17 shows a signal at 0.2116(1) d (full amplitude 0.07 mag with multiple peaks in a period). Signals at P/2 or P/3 were weaker and the 0.2116-d period appears real. This signal apparently appeared in conjunction with the spectral/state transition (ATel #16247). Considering the case of ASASSN-18ey = MAXI J1820+070 (arXiv:2107.03681, Variable Star Bulletin 74), the current variation appears to be stage A superhumps. observers: Berto Monard, Itoh-san and Josch Hambsch

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