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

[vsnet-newvar 10048] ASASSN-16gc likely SU UMa star
by Taichi Kato 01 May '23

01 May '23

ASASSN-16gc likely SU UMa star Precursor + superoutburst in 2022 Nov. in ATLAS data. YYYYMMDD(UT) mag observer 20221108.0103 <16.533g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20221109.0190 <16.010g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20221111.0272 18.365o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.0344 18.058o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.0557 18.078o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.7650 <17.477g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20221111.7740 18.669o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.7790 18.399o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.7903 18.458o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221113.7571 15.263g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20221114.0276 15.445o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221114.0331 15.427o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221114.0362 15.455o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221114.0462 15.463o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7636 17.446c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7672 17.747c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7735 17.590c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7781 17.492c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7881 17.591c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.0195 15.250o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.0222 15.260o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.0272 15.313o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.0408 15.264o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7658 15.281c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7699 15.250c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7731 15.219c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7776 15.284c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7785 15.308c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7930 15.186c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0177 15.688o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0191 14.519o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0209 15.597o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0222 15.716o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0272 15.583o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0372 15.596o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221124.7680 15.924c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221124.7712 15.974c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221124.7775 16.029c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221124.7930 16.058c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-newvar 10047] MASTER OT J150518.03-143933.6 superoutburst?
by Taichi Kato 01 May '23

01 May '23

MASTER OT J150518.03-143933.6 superoutburst? Known SU UMa star. YYYYMMDD(UT) mag observer 20230426.6334 <147c (Yutaka Maeda) 20230427.6660 <150c (Yutaka Maeda) 20230430.6422 147:c (Yutaka Maeda) 20230430.6422 147:c (Yutaka Maeda)

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[vsnet-newvar 10046] SDSS J110014.72+131552.1 likely superoutburst
by Taichi Kato 01 May '23

01 May '23

SDSS J110014.72+131552.1 likely superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20230425.2193 <18.042g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230426.6032 <156c (Yutaka Maeda) 20230426.605 <175C (Mitsutaka Hiraga) 20230427.6318 <141c (Yutaka Maeda) 20230428.9055 14.252g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230430.6119 130:c (Yutaka Maeda)

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[vsnet-newvar 10045] ASASSN-16ef: helium dwarf nova
by Taichi Kato 01 May '23

01 May '23

ASASSN-16ef: helium dwarf nova Typical AM CVn-type superoutburst in 2021 July-Sep in ZTF and ASAS-SN data. Short main superoutburst, dip, long rebrightening followed by multiple short rebrightenings.

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[vsnet-newvar 10044] SDSS J220818.52+135330.0: dwarf nova
by Taichi Kato 30 Apr '23

30 Apr '23

SDSS J220818.52+135330.0: dwarf nova ZTF detected an outburst in 2018 Nov.-Dec. Likely with a rebrightening. The outburst was not as long nor bright as a WZ Sge-type one, and this object is likely an SU UMa star.

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[vsnet-newvar 10043] Gaia DR3 797435239135183744 = SDSS J093130.75+335651.2: eclipsing dwarf nova below the period gap
by Taichi Kato 30 Apr '23

30 Apr '23

Gaia DR3 797435239135183744 = SDSS J093130.75+335651.2: eclipsing dwarf nova below the period gap From ZTF data. Min(BJD) = 2459110.978 + 0.0799401(2) E Bright outburst (at least reaching r=15.6) was in 2020 Sep. and ZTF snapshot data recorded the fading part. Due to the period close to 2/25 d, only phases around eclipses were incidentally recorded by ZTF (observational intervals 2 d). Depths of eclipse more than 1.5 mag. This epoch and period express the quiescent data well, but eclipses in quiescence were below the detection limit of ZTF. Another short outburst in 2021 May.

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[vsnet-newvar 10042] Gaia19bxc: short high state in 2023 Mar.
by Taichi Kato 30 Apr '23

30 Apr '23

Gaia19bxc: short high state in 2023 Mar. Possible polar below the period minimum. Again in low state in Apr. according to ATLAS. YYYYMMDD(UT) mag observer 20230219.5062 19.667zr (ZTF Alert DC mag (Masci+ 2019)) 20230313.4894 18.785zg (ZTF Alert DC mag (Masci+ 2019)) 20230318.3677 18.768o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230318.6110 19.062o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230322.3471 19.094o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230326.3238 18.858o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230326.5960 19.179o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230327.5785 19.387o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-newvar 10041] ZTF18abtbrfb: ordinary polar
by Taichi Kato 30 Apr '23

30 Apr '23

ZTF18abtbrfb: ordinary polar Re: [vsnet-chat 9257] ZTF18abtbrfb: polar below the period minimum? Using the extended ZTF data set, I have confirmed that the double period is the correct one. P=0.0719429(1) d and two strong peaks (1.3 mag and 1.1 mag) per period. Flat part between the peaks. ATLAS data yielded the same period, though faint phases were below the detection limit of ATLAS. All indicate that this object is a polar.

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