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

[vsnet-newvar 9456] ASASSN-15pd possible rare outburst
by Taichi Kato 12 Oct '22

12 Oct '22

ASASSN-15pd possible rare outburst YYYYMMDD(UT) mag observer 20221010.1440 15.279zr (ZTF Alert DC mag (Masci+ 2019)) 20221010.1729 15.258zg (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-newvar 9455] SDSS J001153.08-064739.1: superhump period
by Taichi Kato 12 Oct '22

12 Oct '22

SDSS J001153.08-064739.1: superhump period Josch Hambsch has reported further observations. The superhump period has been determined tp be 0.10414(3) d. Amplitude 0.20 mag. If these superhumps are of stage B, the expected q=0.165 (table 4 in arXiv:2201.02945 = VSOLJ Variable Star Bulletin No. 89). Even if they are of stage C, q would be 0.18. This is very much in disagreement with Rebassa-Mansergas et al. (2014) giving q=0.32(8).

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[vsnet-newvar 9454] ZTF18abtbrfb: polar below the period minimum?
by Taichi Kato 12 Oct '22

12 Oct '22

ZTF18abtbrfb: polar below the period minimum? Using ZTF data, I obtained a period of 0.0335541(1) d (single peak, amplitude 1.0 mag). Although the double period is acceptable, the two peaks look too much alike.

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[vsnet-newvar 9453] SDSS J001153.08-064739.1 superhumps
by Taichi Kato 11 Oct '22

11 Oct '22

SDSS J001153.08-064739.1 superhumps Josch Hambsch detected superhumps also on Oct. 10. Despite the brightness (still brighter than 14.0) and 0.2-mag superhumps, no one else appears to be observing. This object is in the period gap and has an unusual secondary. Please pay more attention.

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[vsnet-newvar 9452] MASTER OT J001204.00-412337.4: 7th rebrightening
by Taichi Kato 11 Oct '22

11 Oct '22

MASTER OT J001204.00-412337.4: 7th rebrightening Josch Hambsch detected another rebrightening on Oct. 10 (16.2 mag). The object had been rising before this rebrightening.

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[vsnet-newvar 9451] Swift J1913.1+1946
by Taichi Kato 09 Oct '22

09 Oct '22

Swift J1913.1+1946 16.6-mag X-ray transient. ATEL #15650 ATEL #15650 Title: Swift J1913.1+1946 a new bright hard X-ray and optical transient Author: S. Dichiara (PSU), J. D. Gropp (PSU), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (U Tampa), F. E. Marshall (NASA/GSFC), A. Tohuvavohu (U Toronto) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team Queries: jak51(a)psu.edu Posted: 9 Oct 2022; 14:44 UT Subjects:Optical, X-ray, Transient At 2022-10-09 14:10:17 UT, the Swift Burst Alert Telescope (BAT) triggered and located the new transient Swift J1913.1+1946 (triggers=1126853 and 1126854). Swift slewed immediately to the location. The BAT on-board calculated location is RA, Dec 288.263, +19.803 which is RA(J2000) = 19h 13m 03s Dec(J2000) = +19d 48' 09" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). After slewing, the source was still visible (leading to the second trigger). The XRT began observing the field at 14:13:30 UT, 143 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 288.2643, 19.7712 which is equivalent to: RA(J2000) = 19h 13m 3.43s Dec(J2000) = +19d 46' 16.3" with an uncertainty of 5.6 arcseconds (radius, 90% containment). This location is 1.9 arc minutes from the BAT onboard position, within the BAT error circle. UVOT took a finding chart exposure of 150 seconds with the White filter starting 179 seconds after the BAT trigger. There is a candidate counterpart in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 19:13:03.48 = 288.26452 DEC(J2000) = +19:46:24.6 = 19.77350 with a 90%-confidence error radius of about 0.61 arc sec. This position is 8.3 arc sec. from the center of the XRT error circle. The estimated magnitude is 16.63 with a 1-sigma error of about 0.14. No correction has been made for the large, but uncertain, extinction expected.

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[vsnet-newvar 9450] ASASSN-21cw likely superoutburst
by Taichi Kato 09 Oct '22

09 Oct '22

ASASSN-21cw likely superoutburst YYYYMMDD(UT) mag observer 20220924.1525 14.835zr (ZTF Alert DC mag (Masci+ 2019)) 20220924.2318 15.133zg (ZTF Alert DC mag (Masci+ 2019)) 20220928.1463 15.229zr (ZTF Alert DC mag (Masci+ 2019)) 20220928.1503 15.574zg (ZTF Alert DC mag (Masci+ 2019)) 20220930.1538 15.691zg (ZTF Alert DC mag (Masci+ 2019)) 20220930.1721 15.321zr (ZTF Alert DC mag (Masci+ 2019)) 20221004.1749 15.537zr (ZTF Alert DC mag (Masci+ 2019)) 20221004.2403 16.130zg (ZTF Alert DC mag (Masci+ 2019)) 20221006.1620 16.504zg (ZTF Alert DC mag (Masci+ 2019)) 20221006.1850 15.700zr (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-newvar 9449] ASASSN-22mr: new WZ Sge-type dwarf nova
by Taichi Kato 09 Oct '22

09 Oct '22

ASASSN-22mr: new WZ Sge-type dwarf nova Berto Monard and Josch Hambsch have reported observations. The data show clear double-humped superhumps with a period of 0.0534(2) d (full amplitude 0.14 mag). 224117.532 -675916.24 (2000.0) Gaia_DR2_6385763697885620480 plx=3.080(0.730) dismod=7.6 pmra=7.201(1.050) pmdec=-1.210(1.120) G=20.444 BP=20.502 RP=20.160 224117.533 -675916.24 (2000.0) Gaia_EDR3_6385763697885620480 plx=2.711(0.552) dismod=7.8 pmra=6.612(0.477) pmdec=1.564(0.553) G=20.396 BP=20.299 RP=20.190 224117.459 -675916.64 (2000.0) GALEX_DR5_6384250644318917360 NUV=20.810(0.146) FUV=20.940(0.242)

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[vsnet-newvar 9448] N080829A possible superoutburst
by Taichi Kato 08 Oct '22

08 Oct '22

N080829A possible superoutburst YYYYMMDD(UT) mag observer 20221003.5749 <155c (Yutaka Maeda) 20221005.2237 16.157zr (ZTF Alert DC mag (Masci+ 2019)) 20221005.2537 15.867zg (ZTF Alert DC mag (Masci+ 2019)) 20221005.5678 <156c (Yutaka Maeda)

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[vsnet-newvar 9447] SDSS J001153.08-064739.1: most likely SU UMa star
by Taichi Kato 07 Oct '22

07 Oct '22

SDSS J001153.08-064739.1: most likely SU UMa star Josch Hambsch has recored a 0.2 mag hump. Although the baseline is one orbital cycle, the profile and amplitude suggest a superhump. This object is very interesting since it is in the period gap and has an evolved secondary. The reported mass ratio is above 0.25 and the detection of superhumps is great astrophysical importance. Continued observations are encouraged.

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