March 2022 - vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 9131] TCP J05454551+5954307: ordinary superhumps
by Taichi Kato 29 Mar '22

29 Mar '22

TCP J05454551+5954307: ordinary superhumps Observations from Crimean Astrophys. Obs. indicate that ordinary superhump evolved on Mar. 27.

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[vsnet-newvar 9130] KLK-32: basically R+E with variation outside eclipses
by Taichi Kato 29 Mar '22

29 Mar '22

KLK-32: basically R+E with variation outside eclipses From ZTF data. Min.BJD = 2458639.8526(1) + 0.0895242(2) E Brightness outside eclipses vary (sometimes bright up to 1 mag as on 2018 July 6).

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[vsnet-newvar 9129] DDE 35 bright
by Taichi Kato 25 Mar '22

25 Mar '22

DDE 35 bright Hiraga-san has pointed out that DDE 35 has been bright for a long time. This object was classified as an SU UUMa star in 2020 March, but superhumps were detected on two nights only. The nature is still unclear. YYYYMMDD(UT) mag observer 20210924.810 <168C (Mitsutaka Hiraga) 20211013.788 164C (Mitsutaka Hiraga) 20211014.756 162C (Mitsutaka Hiraga) 20211017.4744 17.279zr (Zwicky Transient Facility (Masci et al., 2019)) 20211017.4746 17.314zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211017.5133 17.213zg (Zwicky Transient Facility (Masci et al., 2019)) 20211017.5135 17.197zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211021.760 <170C (Mitsutaka Hiraga) 20211025.5161 16.856zr (Zwicky Transient Facility (Masci et al., 2019)) 20211025.5163 16.870zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211102.4792 19.440zr (Zwicky Transient Facility (Masci et al., 2019)) 20211104.4499 19.761zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211104.4499 19.832zg (Zwicky Transient Facility (Masci et al., 2019)) 20211104.4501 19.761zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211104.4673 19.365zr (Zwicky Transient Facility (Masci et al., 2019)) 20211104.4675 19.872zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211106.4564 20.066zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211106.769 <165C (Mitsutaka Hiraga) 20211110.5208 19.965zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211110.5210 19.965zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211112.4515 20.016zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211114.4319 19.941zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211114.5138 20.008zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211114.5139 20.008zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211120.3875 17.673zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211202.3444 16.398zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211202.3446 16.398zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211202.4508 16.024zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220114.615 168C (Mitsutaka Hiraga) 20220115.567 170C (Mitsutaka Hiraga) 20220212.3845 16.247zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220219.3496 16.311zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220226.2188 16.445zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220227.769 158C (Mitsutaka Hiraga) 20220228.4084 15.787zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220228.4738 15.858zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220302.472 164C (Mitsutaka Hiraga) 20220303.2741 16.310zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220309.703 159C (Mitsutaka Hiraga) 20220315.737 164C (Mitsutaka Hiraga) 20220316.6877 <164C (Masayuki Moriyama)

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[vsnet-newvar 9128] TCP J05454551+5954307: early superhumps
by Taichi Kato 25 Mar '22

25 Mar '22

TCP J05454551+5954307: early superhumps Tamas Tordai, Itoh-san, Tonny Vanmunster, Stephen Brincat, Kiyota-san and Josch Hambsch have reported observations. This object has been now confirmed as a WZ Sge stars (confirming the earlier report). Double-wave early superhumps with a full amplitude of 0.10 mag and a period of 0.05631(3) d are present.

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[vsnet-newvar 9127] TCP J05454551+5954307 = ASASSN-22dq
by Taichi Kato 23 Mar '22

23 Mar '22

TCP J05454551+5954307 = ASASSN-22dq > Tamas Tordai has reported observations. The data > show 0.08-mag early superhumps (double maxima) > with a period of 0.0561(8) d. I noticed that Tonny Vanmunster also reported observations under the first name. The first cycle of variation was not very regular according to Vanmunster's data. We should wait on more night to see if the variation is periodic.

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[vsnet-newvar 9126] ASASSN-22dq: new WZ Sge-type dwarf nova
by Taichi Kato 23 Mar '22

23 Mar '22

ASASSN-22dq: new WZ Sge-type dwarf nova Tamas Tordai has reported observations. The data show 0.08-mag early superhumps (double maxima) with a period of 0.0561(8) d. ASASSN-22dq --- ------- 5:45:45.28 59:54:32.6 2022-03-19.29 13.65 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=20.0, g>16.7 on 2022-03-17.29, g=13.9 on 2022-03-19.29, g=14.6 on 2022-03-21.29 ASASSN-22dq 20220317.29 <167g ASN ASASSN-22dq 20220319.29 139g ASN ASASSN-22dq 20220321.29 146g ASN 054545.231 +595432.09 (2000.0) Gaia_DR2_282141555636377984 plx=2.781(0.664) dismod=7.8 pmra=0.263(0.611) pmdec=-2.593(0.740) G=19.746 BP=19.905 RP=19.273 054545.231 +595432.09 (2000.0) Gaia_EDR3_282141555636377984 plx=2.668(0.440) dismod=7.9 pmra=-0.451(0.272) pmdec=-2.094(0.321) G=19.707 BP=19.850 RP=19.333 No past outburst in the ZTF data.

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[vsnet-newvar 9125] ASASSN-22dr
by Taichi Kato 23 Mar '22

23 Mar '22

ASASSN-22dr ASASSN-22dr --- ------- 10:54:17.35 -82:47:14.8 2022-03-20.13 12.89 SDSS DSS VIZIER ------- CV candidate, matches to GAIA DR2 G=20.8, g> 16.9 on 2022-03-18.17, g=15.9 on 2022-03-19.08, g=13.3 on 2022-03-20.12, g=13.6 on 2022-03-21.20 ASASSN-22dr 20220318.17 <169g ASN ASASSN-22dr 20220319.08 159g ASN ASASSN-22dr 20220320.12 133g ASN ASASSN-22dr 20220321.20 136g ASN 105419.470 -824717.58 (2000.0) Gaia_DR2_5197523925585449344 plx=3.619(1.273) dismod=7.2 pmra=-12.461(1.793) pmdec=6.315(2.095) G=20.655 BP=20.847 RP=19.181 105419.467 -824717.58 (2000.0) Gaia_EDR3_5197523925585449344 plx=2.479(0.946) dismod=8.0 pmra=-11.265(1.286) pmdec=6.210(1.473) G=20.585 BP=21.483 RP=19.301 105418.084 -824716.39 (2000.0) GALEX_DR5_6386748728292672066 NUV=22.218(0.444) FUV=-(-) No outburst in ASAS-3.

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[vsnet-newvar 9124] Gaia22ayj: outburst from ultrashort period binary?
by Taichi Kato 23 Mar '22

23 Mar '22

Gaia22ayj: outburst from ultrashort period binary? ZTF data recorded time-resolved photometry on 2019 Jan. 10. The data show very clear double-wave modulations with a period of 0.006500(7) d. Using this period, I analyzed the entire ZTF data and found a period of 0.006499102(1) d = 9.4 min. The profile looks like that of a beta Lyr star with the primary and secondary eclipses of 1.5 and 0.7 mag. Although the period could be that of the spin period of the white dwarf, the amplitude is too large and the profile is too stable. The profile very much looks like an eclipsing binary and the period may be the orbital period. The period is, however, surprisingly short. The value is close to that of the direct impact AM CVn-type accretor V407 Vul (0.006590 d). Gaia22ayj showed an outburst (mag 16 in early March and may be still ongoing) and it suggests the presence of an accretion disk. Could it be a pre-AM CVn object? 082526.528 -223212.35 (2000.0) Gaia_DR2_5697000580270393088 plx=0.601(0.381) dismod=11.1 pmra=-4.255(0.538) pmdec=2.477(0.370) G=19.241 BP=19.399 RP=18.345 082526.528 -223212.34 (2000.0) Gaia_EDR3_5697000580270393088 plx=0.430(0.220) dismod=11.8 pmra=-4.238(0.206) pmdec=2.636(0.171) G=19.216 BP=19.570 RP=18.461

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[vsnet-newvar 9123] ASASSN-22dl: eclipses
by Taichi Kato 20 Mar '22

20 Mar '22

ASASSN-22dl: eclipses Josch Hambsch and Itoh-san have reported new observations. The object already show eclipses at least since Mar. 18. It may have already entered a phase of ordinary superhumps (now stage A).

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[vsnet-newvar 9122] ASASSN-21ob: dwarf nova below the period gap with strong ellipsoidal variation
by Taichi Kato 18 Mar '22

18 Mar '22

ASASSN-21ob: dwarf nova below the period gap with strong ellipsoidal variation From ZTF data. Porb = 0.0769268(3) d. Double-wave modulation (ellipsoidal variation). Total amplitude 0.14 mag. Too red for this Porb and the secondary may be evolved. Although genuine superoutburst has not been recorded, it is expected.

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vsnet-newvar March 2022