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

[vsnet-newvar 10108] Gaia DR3 4538714906329565952 = ZTF23aaladoy outburst
by Taichi Kato 25 May '23

25 May '23

Gaia DR3 4538714906329565952 = ZTF23aaladoy outburst Fading too rapidly for a superoutburst? YYYYMMDD(UT) mag observer 20230521.5006 15.905o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.5024 15.928o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.5063 15.932o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.5122 15.924o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.6066 16.246o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.6098 16.270o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.6130 16.303o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.7678 165V (Masayuki Moriyama) 20230523.7688 16.43C (Masayuki Moriyama)

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[vsnet-newvar 10107] ASASSN-13bs outburst
by Taichi Kato 25 May '23

25 May '23

ASASSN-13bs outburst Subtype unknown. Rather strange behavior in the past. YYYYMMDD(UT) mag observer 20230513.6041 <167C (Masayuki Moriyama) 20230514.599 175C (Mitsutaka Hiraga) 20230514.7266 <163C (Masayuki Moriyama) 20230514.7332 <149c (Yutaka Maeda) 20230515.6956 <145c (Yutaka Maeda) 20230519.7000 <162c (Yutaka Maeda) 20230520.576 175C (Mitsutaka Hiraga) 20230523.7797 144C (Masayuki Moriyama)

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[vsnet-newvar 10106] Re: ELAISN1MOS15-02 classification and period
by Taichi Kato 24 May '23

24 May '23

> SDSS J182643.55+613816.5 is the already known object > MASTER OT J182643.42+613816 (SU UMa). -> MASTER OT J182643.42+613816.2

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[vsnet-newvar 10105] ELAISN1MOS15-02 classification and period
by Taichi Kato 24 May '23

24 May '23

ELAISN1MOS15-02 classification and period https://arxiv.org/abs/2305.13371 "Cataclysmic Variables from Sloan Digital Sky Survey V -- the search for period bouncers continues" I could not confirm the claimed period for ELAISN1 MOS15-02 = SDSS J160809.54+542131.4. The fading rates of outbursts appear to me to small for the claimed period. This object is still a mystery one to me. SDSS J182643.55+613816.5 is the already known object MASTER OT J182643.42+613816 (SU UMa).

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[vsnet-newvar 10104] Gaia DR3 2893005857946801152 = ASASSN-23dr: most likely WZ Sge star
by Taichi Kato 24 May '23

24 May '23

Gaia DR3 2893005857946801152 = ASASSN-23dr: most likely WZ Sge star Josch Hambsch has reported further observations. There was an apparent superhump on May 22-23. As judged from the outburst light curve, the object probably entered the phase of ordinary superhumps (but there was a gap in the data). The initial rapid decay and the waiting time suggest a WZ Sge star.

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[vsnet-newvar 10103] ZTF23aajjayv still bright
by Taichi Kato 22 May '23

22 May '23

ZTF23aajjayv still bright The light curve suggests a superoutburst. YYYYMMDD(UT) mag observer 20230512.0661 <16.962g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.0673 <17.048g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.0686 16.874g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.2494 <15.386g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.2507 <15.026g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.2519 <14.876g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.4247 <17.254g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.4260 16.854g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.4273 16.891g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230513.3099 15.520zr (ZTF Alert DC mag (Masci+ 2019)) 20230513.3544 15.942zg (ZTF Alert DC mag (Masci+ 2019)) 20230513.3678 15.602g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230513.3691 15.647g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230513.3703 15.463g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230514.2359 14.480o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.2438 14.520o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.2479 14.494o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.3689 14.031g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230514.3701 14.026g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230514.3714 14.040g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.2651 14.217zg (ZTF Alert DC mag (Masci+ 2019)) 20230515.3262 14.161g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.3274 14.166g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.3287 14.186g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.9732 14.266g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.9745 14.256g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.9757 14.302g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230516.3228 14.295g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230516.3240 14.314g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230516.3253 14.279g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230517.2755 14.455zr (ZTF Alert DC mag (Masci+ 2019)) 20230517.3008 14.431zg (ZTF Alert DC mag (Masci+ 2019)) 20230519.2269 14.588zr (ZTF Alert DC mag (Masci+ 2019)) 20230519.3191 14.640zg (ZTF Alert DC mag (Masci+ 2019)) 20230520.6197 15.15C (Masayuki Moriyama) 20230521.5852 152C (Masayuki Moriyama)

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[vsnet-newvar 10102] ASASSN-18dh: most likely superoutburst (AM CVn?)
by Taichi Kato 22 May '23

22 May '23

ASASSN-18dh: most likely superoutburst (AM CVn?) 2021 outburst followed by multiple rebrightenings + fading tail (ATLAS+ZTF). Less clear but similar in 2018. Resembles an AM CVn star. YYYYMMDD(UT) mag observer 20230506.2587 16.138g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230508.3587 <17.350g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.3436 <17.899g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.9126 <16.261g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230511.1877 <16.957g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230512.3366 16.112g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230514.1866 <17.921g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230517.2269 15.779g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230518.7854 16.204c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.7886 16.252c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.7942 16.247c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.8043 16.208c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230519.2205 16.119g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-newvar 10101] ASASSN-17rf: most likely WZ Sge star with dip + rebrightening
by Taichi Kato 21 May '23

21 May '23

ASASSN-17rf: most likely WZ Sge star with dip + rebrightening From ASAS-SN ver 2 + ATLAS. Deep dip (nearly double outburst), long rebrightening + short ones?

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[vsnet-newvar 10100] ASASSN-17qk: most likely WZ Sge star with multiple rebrightenings
by Taichi Kato 21 May '23

21 May '23

ASASSN-17qk: most likely WZ Sge star with multiple rebrightenings From ASAS-SN ver 2 + ATLAS. Five rebrightenings. No outburst since.

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[vsnet-newvar 10099] Gaia DR3 5931782154434729600 = Gaia23bt: likely RCB star fading
by Taichi Kato 21 May '23

21 May '23

Gaia DR3 5931782154434729600 = Gaia23bt: likely RCB star fading http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia23btd/ Non-red and luminious object. Consistent with RCB. 2MASS 161615.906 -544445.35 (2000.0) 12.495 12.134 11.774 161615.9 -544445 (2000.0) Gaia_DR3_5931782154434729600 RS (score=0.01) 161615.931 -544445.47 (2000.0) Gaia_DR2_5931782154434729600 plx=0.015(0.032) dismod=19.2 pmra=-2.920(0.052) pmdec=-2.724(0.041) G=14.549 BP=15.236 RP=13.707 161615.930 -544445.47 (2000.0) Gaia_EDR3_5931782154434729600 plx=0.021(0.024) dismod=18.4 pmra=-2.885(0.028) pmdec=-2.745(0.021) G=14.538 BP=15.214 RP=13.699

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