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

[vsnet-newvar 10118] ASASSN-14hg: superoutbursts with multiple rebrightenings
by Taichi Kato 29 May '23

29 May '23

ASASSN-14hg: superoutbursts with multiple rebrightenings From ATLAS+ASAS-SN(DB). Typical one in 2021 June. Also in 2016 Sep. and 2017 Nov.-Dec. Too frequent for a WZ Sge star and rapid fading from rebrightenings suggest either EI Psc or AM CVn star.

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[vsnet-newvar 10117] ASASSN-14ai likely superoutburst
by Taichi Kato 29 May '23

29 May '23

ASASSN-14ai likely superoutburst Type from ATLAS + ASAS-SN DB. YYYYMMDD(UT) mag observer 20230519.7535 <18.862g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230520.0953 <17.616g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230521.0913 18.520g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230524.0784 17.839g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230525.0743 <17.502g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230527.0656 16.263g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230528.0612 15.959g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-newvar 10116] ASASSN-18fp superoutburst
by Taichi Kato 29 May '23

29 May '23

ASASSN-18fp superoutburst YYYYMMDD(UT) mag observer 20230523.4905 <149c (Yutaka Maeda) 20230526.4925 138:c (Yutaka Maeda) 20230528.692 137 (Rod Stubbings)

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[vsnet-newvar 10115] CRTS J170208.5+551826: another HT Cam-like object (IP?)
by Taichi Kato 26 May '23

26 May '23

CRTS J170208.5+551826: another HT Cam-like object (IP?) Very rapid fading from outbursts (ZTF+ATLAS). Short low states in quiescence. IP?

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[vsnet-newvar 10114] 6dFg2044559-115154 = ASASSN-14ds: UG+IP?
by Taichi Kato 26 May '23

26 May '23

6dFg2044559-115154 = ASASSN-14ds: UG+IP? Rapid fading near termination of outbursts (ATLAS+ZTF) similar to HT Cam. Also X-ray bright.

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[vsnet-newvar 10113] ASASSN-16pr: SU UMa star
by Taichi Kato 25 May '23

25 May '23

ASASSN-16pr: SU UMa star From ATLAS data. Superoutburst + rebrightening in 2023 Jan. Other superoutbursts in 2019 Mar. and 2020 Oct.

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[vsnet-newvar 10112] ASASSN-16mi possible superoutburst
by Taichi Kato 25 May '23

25 May '23

ASASSN-16mi possible superoutburst Type from ZTF+ATLAS. Faint superoutburst? YYYYMMDD(UT) mag observer 20230509.2645 <17.076g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230509.2645 <17.407g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.4399 <17.166g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230514.5365 18.841o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.5415 18.756o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.5474 18.590o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.5714 16.432o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.5756 16.479o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230520.626 171C (Mitsutaka Hiraga) 20230522.5366 17.022o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5389 16.974o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5517 17.076o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5595 17.006o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.5531 17.023o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.5549 17.121o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.5580 17.017o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-newvar 10111] ASASSN-16lh outburst
by Taichi Kato 25 May '23

25 May '23

ASASSN-16lh outburst Long and short outbursts (long one presently). Amplitude too small for an SU UMa star? YYYYMMDD(UT) mag observer 20230507.4281 <16.779g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230509.1149 18.371o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230509.1195 18.635o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230509.1254 18.462o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230510.4227 <17.029g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230511.4188 16.740g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230512.4145 17.266g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230513.4139 16.394g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230514.4096 17.473g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230514.4096 17.493g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230515.4356 <16.397g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230516.4280 16.425g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230518.4082 16.861g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230519.3911 16.184o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230519.3929 17.303o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230524.4065 <16.721g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-newvar 10110] Gaia DR3 2893005857946801152 = ASASSN-23dr: superhump period
by Taichi Kato 25 May '23

25 May '23

Gaia DR3 2893005857946801152 = ASASSN-23dr: superhump period Berto Monard and Josch Hambsch have reported further observations. Thanks to Monard's high-cadence data, it has become apparent that ordinary superhumps started to appear on May 19. Due the the gap in the observation, I analyzed the data since May 22 and obtained a superhump period of 0.0580(1) d (amplitude 0.10 mag and the existence of superhumps is unambiguous). I could not detect early superhumps corresponding to this period, but as I already reported, this object appears to be a WZ Sge star.

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[vsnet-newvar 10109] ASASSN-22ak period
by Taichi Kato 25 May '23

25 May '23

ASASSN-22ak period Josch Hambsch has reported further observations. Thanks to the recent high-cadence data, the period has been established. The object brightened a bit on May 21 and the period since then has been 0.04292(2) d. Based on this alias selection, the period from the entire data is 0.043032(4) d. The profile still never appeared to be typical superhump-like. It has been fast rising and slower fading, as in early superhumps. The amplitude is 0.04 mag. The observations appear to confirm the classification of the object as being below the period minimum (EI Psc star).

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vsnet-newvar May 2023