J/ApJ/811/32 BVRcIcJHK and X-ray LCs of the U Sco nova (Pagnotta+, 2015)
The 2010 eruption of the recurrent nova U Scorpii: the multi-wavelength
light curve.
Pagnotta A., Schaefer B.E., Clem J.L., Landolt A.U., Handler G., Page K.L.,
Osborne J.P., Schlegel E.M., Hoffman D.I., Kiyota S., Maehara H.
<Astrophys. J., 811, 32 (2015)>
=2015ApJ...811...32P 2015ApJ...811...32P (SIMBAD/NED BibCode)
ADC_Keywords: Novae ; Photometry, UBVRI ; Photometry, infrared ; X-ray sources
Keywords: novae, cataclysmic variables; stars: individual: U Sco
Abstract:
The recurrent nova U Scorpii most recently erupted in 2010. Our
collaboration observed the eruption in bands ranging from the Swift
XRT and UVOT w2 (193nm) to K-band (2200nm), with a few serendipitous
observations stretching down to WISE W2 (4600nm). Considering the time
and wavelength coverage, this is the most comprehensively observed
nova eruption to date. We present here the resulting multi-wavelength
light curve covering the two months of the eruption as well as a few
months into quiescence. For the first time, a U Sco eruption has been
followed all the way back to quiescence, leading to the discovery of
new features in the light curve, including a second,
as-yet-unexplained, plateau in the optical and near-infrared. Using
this light curve we show that U Sco nearly fits the broken power law
decline predicted by Hachisu & Kato (2006ApJS..167...59H 2006ApJS..167...59H), with
decline indices of -1.71±0.02 and -3.36±0.14. With our
unprecedented multi-wavelength coverage, we construct daily spectral
energy distributions and then calculate the total radiated energy of
the eruption, Erad=6.99+0.83-0.57x1044erg. From that, we
estimate the total amount of mass ejected by the eruption to be
mej=2.10+0.24-0.17x10-6M☉. We compare this to the total
amount of mass accreted by U Sco before the eruption, to determine
whether the white dwarf undergoes a net mass loss or gain, but find
that the values for the amount of mass accreted are not precise enough
to make a useful comparison.
Description:
The observations were largely coordinated by our group at Louisiana
State University (LSU) and were carried out at telescopes all over the
world and from a number of orbiting observatories. The BVRcIcJHK
observations by Pagnotta using the SMARTS 1.3m at CTIO and UBVRcIc
observations by Handler using the SAAO 0.5m form the backbone of our
optical/near-IR light curve. Regular observations were made by the
Swift XRT and UVOT instruments. Additionally, there were a few
serendipitous observations made by the WISE satellite during its
infrared survey mission.
Objects:
---------------------------------------------------
RA (ICRS) DE Designation(s)
---------------------------------------------------
16 22 30.80 -17 52 43.2 U Sco = NOVA Sco 1863
---------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 78 1577 U Sco 2010 observations, infrared to
ultraviolet magnitude
table4.dat 36 366 U Sco 2010 observations, X-ray count rates
--------------------------------------------------------------------------------
See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
B/cb : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2014)
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
J/A+A/559/A121 : U Sco outburst & pre-outburst optical spectrum (Anupama, 2013)
J/ApJS/197/31 : Swift X-ray obs. of classical novae. II. (Schwarz+, 2011)
J/ApJ/742/113 : Photometry during the 2010 eruption of U Sco (Schaefer+, 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: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.4 d HJD Heliocentric Julian Date of observation
15- 19 F5.3 --- Phase Orbital Phase
22- 29 A8 --- Obs Person who made the observation
31- 54 A24 --- Tel Telescope used
56- 66 A11 --- Filt Filter used (UBVRcIcJHK, Stromgren by, w1, w2,
and W1, W2) (1)
68- 72 F5.2 mag mag [7.5/20] Magnitude in Filt
75- 78 F4.2 mag e_mag [0/0.3] 1-sigma error on the magnitude
--------------------------------------------------------------------------------
Note (1): Observation details (table 1):
--------------------------------------------------------------------
Observer Telescope Location Filters
--------------------------------------------------------------------
Pagnotta CTIO 1.3m Cerro Tololo, Chile BVRIJHK
Handler SAAO 0.5m Sutherland, South Africa UBVRIy
Clem CTIO 1.3m Cerro Tololo, Chile Stromgren y
Landolt KPNO 2.1m Kitt Peak, Arizona Stromgren y
Maehara Kwasan 0.25m Kyoto, Japan Stromgren y
Kiyota 0.25m Schmidt- Ibaraki, Japan Stromgren y
Cassegrain
--- Swift UVOT --- w1 (260nm),
w2 (193nm)
--- Swift XRT --- 0.3-10keV
--- WISE --- W1 (3400nm),
W2 (4600nm)
--------------------------------------------------------------------
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.4 d HJD Heliocentric Julian Date of observation
15- 20 F6.4 --- Phase Orbital Phase
23- 28 F6.4 ct CR [0.001/2.7] Swift/XRT 0.3-10keV count rate
31- 36 F6.4 ct e_CR [0.0003/0.5] 1-sigma error on the XRT count rate
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Dec-2015