February 2023 - vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 9827] ASASSN-15cu possible superoutburst
by Taichi Kato 28 Feb '23

28 Feb '23

ASASSN-15cu possible superoutburst Likely eclipsing. YYYYMMDD(UT) mag observer 20230213.8500 19.292o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230213.8577 19.458o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230219.0751 19.097c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230219.0787 19.220c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230221.8495 16.046o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230221.8527 16.037o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230221.8595 16.083o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230221.8704 16.070o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230223.0719 15.488c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230223.0755 15.516c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230223.0809 15.535c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230223.0909 15.613c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230225.3046 15.330o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230225.3077 15.313o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230225.3128 15.364o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230225.3267 15.575o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230227.0660 15.529o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230227.0692 15.593o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230227.0746 15.700o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230227.0856 16.834o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

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[vsnet-newvar 9826] SSSJ090619.2-275831
by Taichi Kato 28 Feb '23

28 Feb '23

SSSJ090619.2-275831 likely superoutburst (Likely SU UMa/ER UMa star) YYYYMMDD(UT) mag observer 20230221.6214 157C (Masayuki Moriyama) 20230224.6354 <160C (Masayuki Moriyama) 20230226.6103 16.01C (Masayuki Moriyama)

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[vsnet-newvar 9825] ASASSN-23ba: updated period of early superhumps
by Taichi Kato 27 Feb '23

27 Feb '23

ASASSN-23ba: updated period of early superhumps The data are from Berto Monard, Peter Starr, Josch Hambsch and Itoh-san. The period is 0.05662(1) d.

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[vsnet-newvar 9824] ASASSN-23aw: new SU UMa star
by Taichi Kato 27 Feb '23

27 Feb '23

ASASSN-23aw: new SU UMa star Using observations by Josch Hambsch, superhumps have developed since Feb. 23. The period is 0.0520(1) or 0.0549(1) d (rather difficult to determine due to the low sampling rate).

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[vsnet-newvar 9823] ASASSN-23ax: rebrightening
by Taichi Kato 27 Feb '23

27 Feb '23

ASASSN-23ax: rebrightening Josch Hambsch detected a rebrightening on Feb. 26 after a dip of 2-3 d.

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[vsnet-newvar 9822] Re: MASTER OT J055845.55+391533.4: new SU UMa-type dwarf nova
by Taichi Kato 25 Feb '23

25 Feb '23

Re: MASTER OT J055845.55+391533.4: new SU UMa-type dwarf nova > The resulting light curve clearly shows the presence of regular superhumps > (4 in total) with an amplitude of 0.20 mag, establishing MASTER OT > J055845.55+391533.4 as a new SU UMa-type dwarf nova. The object is unusual in that it almost regularly showed a deep dip during past outbursts. There were sometimes variations like oscillations after the dip, and the overall behavior resembles a double superoutburst. 2018 Apr., 2019 Mar.-Apr., 2020 May, 2021 Jan.-Feb., 2021 Sep. all showed this feature. There was, however, no fading tail looking like an AM CVn star. The number of normal outbursts was smaller than that of superoutbursts. Please continue observing, since a dip is expected within a week. Recording variation of superhumps during the entire course of a superoutburst is very important to see what is happening.

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[vsnet-newvar 9821] GDS J1145134-620057: IW And
by Taichi Kato 25 Feb '23

25 Feb '23

GDS J1145134-620057: IW And ATLAS: 15.8-18.2. IW And behavior in early 2023. Some hint in 2022.

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[vsnet-newvar 9820] GDS J1308184-633131: IW And
by Taichi Kato 25 Feb '23

25 Feb '23

GDS J1308184-633131: IW And ATLAS: 15.6-18.6. Long standstill + at least one terminal brightening.

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[vsnet-newvar 9819] GDS J1010438-582025: active dwarf nova
by Taichi Kato 25 Feb '23

25 Feb '23

GDS J1010438-582025: active dwarf nova ATLAS: 14.8-18.4. Frequent outbursts. SS Cyg? (Some outbursts resembles superoutbursts, but look like long outbursts of an SS Cyg star)

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[vsnet-newvar 9817] GDSJ0703457-063947: IW And star
by Taichi Kato 25 Feb '23

25 Feb '23

GDSJ0703457-063947: IW And star Using ATLAS forced photometry (Tonry et al. 2018; Shingles et al. 2021), this object turned out to be an IW And star (typical behavior in 2022). The variation was more heartbeat-like in 2020-2021, when the object was slightly brighter. This may be a suggestion of various IW And-type behavior depending on the mass-transfer rate.

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