J/ApJ/742/113 Photometry during the 2010 eruption of U Sco (Schaefer+, 2011)
Eclipses during the 2010 eruption of the recurrent nova U Scorpii.
Schaefer B.E., Pagnotta A., LaCluyze A.P., Reichart D.E., Ivarsen K.M.,
Haislip J.B., Nysewander M.C., Moore J.P., Oksanen A., Worters H.L.,
Sefako R.R., Mentz J., Dvorak S., Gomez T., Harris B.G., Henden A.A.,
Tan T.G., Templeton M., Allen W.H., Monard B., Rea R.D., Roberts G.,
Stein W., Maehara H., Richards T., Stockdale C., Krajci T., Sjoberg G.,
McCormick J., Revnivtsev M., Molkov S., Suleimanov V., Darnley M.J.,
Bode M.F., Handler G., Lepine S., Shara M.M.
<Astrophys. J., 742, 113 (2011)>
=2011ApJ...742..113S 2011ApJ...742..113S
ADC_Keywords: Novae ; Photometry, UBVRI
Keywords: novae, cataclysmic variables - stars: individual (U Sco)
Abstract:
The eruption of the recurrent nova U Scorpii on 2010 January 28 is now
the all-time best observed nova event. We report 36776 magnitudes
throughout its 67 day eruption, for an average of one measure every
2.6 minutes. This unique and unprecedented coverage is the first time
that a nova has had any substantial amount of fast photometry. With
this, two new phenomena have been discovered: the fast flares in the
early light curve seen from days 9-15 (which have no proposed
explanation) and the optical dips seen out of eclipse from days 41-61
(likely caused by raised rims of the accretion disk occulting the
bright inner regions of the disk as seen over specific orbital
phases). The expanding shell and wind cleared enough from days 12-15
so that the inner binary system became visible, resulting in the
sudden onset of eclipses and the turn-on of the supersoft X-ray
source. On day 15, a strong asymmetry in the out-of-eclipse light
points to the existence of the accretion stream. The normal optical
flickering restarts on day 24.5. For days 15-26, eclipse mapping shows
that the optical source is spherically symmetric with a radius of
4.1R☉. For days 26-41, the optical light is coming from a
rim-bright disk of radius 3.4R☉. For days 41-67, the optical
source is a center-bright disk of radius 2.2R☉. Throughout the
eruption, the colors remain essentially constant. We present 12
eclipse times during eruption plus five just after the eruption.
Description:
We have daily and hourly photometry in the X-ray, the ultraviolet, the
optical, the near- and middle-infrared, plus we have daily and hourly
spectroscopy in the X-ray, ultraviolet, optical, and near-infrared. We
have intensive pre-eruption monitoring from 2000 until the hour before
the start of the eruption (Schaefer et al. 2010, Cat. J/AJ/140/925).
In this paper, we will only report on our optical photometry taken
throughout the eruption and we are concentrating on the essentially
V-band magnitudes, the UBVRI fast photometry, and the eclipse timing
(with the CTIO 0.9m, the MDM 2.4m, and the San Pedro de Atacama 0.5m
telescopes), and this is where we have the 36776 measures. All of
these magnitudes were taken with CCDs. Roughly three quarters were
made with a Johnson V-band filter or with CCDs running with no filter.
Objects:
----------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------
16 22 30.80 -17 52 43.2 V* U Sco = NOVA Sco 1863
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 122 28 Photometry observers and sites
table2.dat 46 7752 Observed V-band magnitudes for U Sco eruption
table3.dat 32 8916 UBVRI fast photometry from PROMPT 0.41m
table4.dat 42 327 Post-eruption eclipse time series
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2013)
B/cb : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2013)
V/123 : Catalog of Cataclysmic Variables (Downes+ 2001-2006)
II/237 : Stellar Photometry in Johnson's 11-color system (Ducati, 2002)
J/ApJS/197/31 : Swift observations of classical novae. II. (Schwarz+, 2011)
J/AJ/140/925 : Pre-eruption light curves for Nova U Sco (Schaefer+, 2010)
J/AJ/140/34 : Classification of nova light curves (Strope+, 2010)
J/ApJS/187/275 : Photometric histories of recurrent novae (Schaefer, 2010)
J/ApJ/565/511 : Cataclysmic variables in the 2MASS 2IDR (Hoard+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 21 A21 --- Obs Observer name(s)
22 A1 --- f_Obs [a] a: Munari et al. 2010IBVS.5930....1M 2010IBVS.5930....1M
24- 50 A27 --- Site Telescope site
52- 75 A24 --- Tel Telescope identification
77- 92 A16 --- Filt Filter(s)
94- 98 F5.1 d Start HJD start (HJD-2455000)
99 A1 --- --- [-]
100-104 F5.1 d Stop HJD stop (HJD-2455000)
106-110 I5 --- Nmags [12/11543] Number of observed magnitudes
112-116 F5.2 mag Off1 Offset 1
118-122 F5.2 mag Off2 ? Offset 2
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date
14- 19 F6.4 --- Phase Phase
21- 25 F5.2 mag Vmag [7.83/18.48] V band magnitude
27- 30 F4.2 mag e_Vmag [0.01/0.31] Uncertainty in Vmag
32- 36 F5.2 --- V-Vt Detrended V band magnitude
38- 46 A9 --- Obs Observer name
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Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date
14- 19 F6.4 --- Phase Phase
21 A1 --- Band Band used in the observation (VI for table 4)
23- 27 F5.2 mag mag Observed magnitude in Band
29- 32 F4.2 mag e_mag Uncertainty in mag
34- 42 A9 --- Tel Telescope (only for table 4)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 24-Apr-2013