J/PASJ/76/293 U Sco 2022 eruption light curves (Muraoka+, 2024)
Optical and soft X-ray light-curve analysis during the 2022 eruption of
U Scorpii: Structural changes in the accretion disk.
Muraoka K., Kojiguchi N., Ito J., Nogami D., Kato T., Tampo Y., Taguchi K.,
Isogai K., Arranz T., Blackwell J., Blane D., Brincat S.M., Coates G.,
Cooney W., Dvorak S., Galdies C., Glomski D., Hambsch F.-J., Harris B.,
Hodge J., Hernandez-verdejo J.L., Iozzi M., Itoh H., Kiyota S., Lee D.,
Larsson M., Lahtinen T., Myers G., Monard B., Morales Aimar M.,
Moriyama M., Mizutani M., Nagai K., Alqaissieh T., Gabuya A.B., Odeh M.,
Perello C., Pearce A., Perales J.M., Quiles D., Romanov F.D., Lane D.J.,
Richmond M., Ruocco N., Sano Y., Spearman M., Schmidt R., Vanmunster T.,
Dubovsky P.A., Wagner R., Wollenhaupt G., Lorenz J., Lehmann G.,
Salewski A., Williamson G.
<Publ. Astron. Soc. Jap., 76, 293-305 (2024)>
=2024PASJ...76..293M 2024PASJ...76..293M (SIMBAD/NED BibCode)
ADC_Keywords: Novae ; Photometry ; Optical
Keywords: accretion, accretion disks - novae, cataclysmic variables -
stars: individual (U Scorpii) - techniques: photometric
Abstract:
We present our optical photometric observations of the 2022 eruption
of the recurrent nova U Scorpii (U Sco) using 49152 data points over
70d following the optical peak. We have also analyzed its soft X-ray
(0.3-1keV) light curve by the Neil Gehrels Swift Observatory. During
the 2022 eruption, the optical plateau stage started 13.8-15.0d and
ended 23.8-25.0d after the optical peak. The soft X-ray stage started
14.6-15.3d and ended 38.7-39.5d after the optical peak. Both stages
started later and had shorter durations, and the soft X-ray light
curve peaked earlier and was less luminous compared to those during
the U Sco 2010 eruption. These points suggest that there were
differences in the envelope mass between the different cycles of the
nova eruption. Furthermore, we have analyzed the optical eclipses
during the 2022 eruption. The primary eclipse was first observed
10.4-11.6d after the optical peak, earlier than the beginning of the
optical plateau stage. This sequence of events can be explained by the
receding ejecta photosphere associated with the expanding nova ejecta.
We have determined the ingress and egress phases of the primary
eclipses and estimated the outer radius of the optical light source
centered at the white dwarf (WD). During the optical plateau stage,
the source radius remained ∼1.2 times larger than the Roche volume
radius of the primary WD, being close to the L1 point. When the
optical plateau stage ended, the source radius drastically shrank to
the tidal truncation radius within a few orbital periods. This
previously unresolved phenomenon can be interpreted as a structural
change in U Sco where the temporarily expanded accretion disk due to
the nova wind returned to a steady state.
Description:
We obtained rich optical and soft X-ray photometric data
in the 2022 eruption of U Sco.
Objects:
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RA (2000) DE Designation(s)
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16 22 30.77 -17 52 43.1 U Sco = BD-17 4554
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablee1.dat 235 44 List of observers and instruments
for optical photometry
tablee2.dat 42 347 Log of optical photometry of the U Sco 2022
eruption
tablee3.dat 43 104 Log of soft X-ray photometry of the U Sco 2022
eruption
tablee4.dat 43 96 Log of soft X-ray photometry of the 2010
eruption
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See also:
J/AJ/140/925 : Pre-eruption light curves for Nova U Sco (Schaefer+, 2010)
J/ApJ/742/112 : All quiescent magnitudes for CI Aql and U Sco (Schaefer, 2011)
J/ApJ/742/113 : Photometry during the 2010 eruption of U Sco (Schaefer+, 2011)
J/A+A/559/A121 : U Sco outburst & pre-outburst optical spectrum (Anupama, 2014)
J/ApJ/811/32 : BVRcIcJHK and X-ray LCs of the U Sco nova (Pagnotta+, 2015)
Byte-by-byte Description of file: tablee1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Code Code
6-235 A230 --- Obs Observer (Observatory)/Telescope & CCD
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Byte-by-byte Description of file: tablee2.dat
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Bytes Format Units Label Explanations
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1- 9 F9.3 d BJDStar Star barycentric Julian date (TT) (BJD-2400000)
11- 19 F9.3 d BJDEnd End barycentric Julian date (TT) (BJD-2400000)
21- 26 F6.3 mag mag Mean magnitude
28- 32 F5.3 mag e_mag Standard deviation of the magnitude
34- 37 I4 --- NObs Number of observations
39- 42 A4 --- Code Observer's code (in tablee1.dat)
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Byte-by-byte Description of file: tablee3.dat tablee4.dat
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Bytes Format Units Label Explanations
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1- 11 I11 --- ObsID Observation ID
13- 31 A19 "datime" Start Star date (UTC)
33- 43 F11.5 s ExpTime Exposure time
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 13-Aug-2024