J/MNRAS/443/3174 72 faint CV candidates in CRTS (Breedt+, 2014)
1000 cataclysmic variables from the Catalina Real-time Transient Survey.
Breedt E., Gansicke B.T., Drake A.J., Rodriguez-Gil P., Parsons S.G.,
Marsh T.R., Szkody P., Schreiber M.R., Djorgovski S.G.
<Mon. Not. R. Astron. Soc., 443, 3174-3207 (2014)>
=2014MNRAS.443.3174B 2014MNRAS.443.3174B (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, cataclysmic ; Photometry, SDSS
Keywords: stars: binaries: close - stars: dwarf novae -
novae, cataclysmic variables
Abstract:
Over six years of operation, the Catalina Real-time Transient Survey
(CRTS) has identified 1043 cataclysmic variable (CV) candidates - the
largest sample of CVs from a single survey to date. Here, we provide
spectroscopic identification of 85 systems fainter than g≥19,
including three AM Canum Venaticorum binaries, one helium-enriched CV,
one polar and one new eclipsing CV. We analyse the outburst properties
of the full sample and show that it contains a large fraction of
low-accretion-rate CVs with long outburst recurrence times. We argue
that most of the high-accretion-rate dwarf novae in the survey
footprint have already been found and that future CRTS discoveries
will be mostly low-accretion-rate systems. We find that CVs with
white-dwarf-dominated spectra have significantly fewer outbursts in
their CRTS light curves compared to disc-dominated CVs, reflecting the
difference in their accretion rates. Comparing the CRTS sample to
other samples of CVs, we estimate the overall external completeness to
be 23.6 per cent, but show that as much as 56 per cent of CVs have
variability amplitudes that are too small to be selected using the
transient selection criteria employed by current ground-based surveys.
The full table of CRTS CVs, including their outburst and spectroscopic
properties examined in this paper, is provided in the online
materials.
Description:
We obtained identification spectra of a total of 72 faint CV
candidates identified by the CRTS, using the Gran Telescopio Canarias
(GTC; La Palma, Spain) and the Gemini telescopes (North: Mauna Kea,
Hawaii and South: Cerro Pachon, Chile). The observations were carried
out in service mode during 2010, 2011 and 2013.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 115 75 *Observation log of our spectroscopic
identification program
table2.dat 101 72 Spectral properties and classification of our
spectroscopic targets
table3.dat 98 5 Dereddened magnitudes of the AM CVn systems and
helium-enriched binaries identified in our
follow-up sample
table4.dat 96 9 CRTS CVs with SDSS BOSS spectra
table5.dat 44 6 *Outburst spectra of CVs as observed by PESSTO as
part of supernova follow-up observations
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Note on table1.dat: ordered by target right ascension. The Gemini spectra
consist of three individual exposures.
Note on table5.dat: All spectra were taken with the EFOSC2 spectrograph on
the NTT.
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See also:
J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)
J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)
J/MNRAS/441/1186 : Cataclysmic variables from CRTS (Drake+, 2014)
J/MNRAS/453/1562 : CRTS close supermassive black hole binaries (Graham+, 2015)
J/MNRAS/456/4441 : Cataclysmic variables outburst catalogue (Coppejans+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [CRTS]
6- 21 A16 --- CRTS CRTS name (JHHMMSS.s+DDMMSS)
23- 29 F7.3 deg RAdeg Right ascension (J2000)
31- 37 F7.3 deg DEdeg Declination (J2000)
39- 48 A10 --- Inst Instrument
50- 59 A10 "YYYY-MM-DD" Obs.date Observation date
61- 70 A10 "h:m:s" Obs.time Observation time (UT)
72- 75 F4.1 min ExpTime Exposure time (1)
77-115 A39 --- Com Comments
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Note (1): The observation date refers only to the first spectrum of that target,
but the exposure time is the total exposure time.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [CRTS]
6- 21 A16 --- CRTS CRTS designation (JHHMMSS.s+DDMMSS)
23- 46 A24 --- AName Alternative name
48- 52 F5.2 mag umag Best estimates of the quiescent brightness in
SDSS g magnitude (from SDSS DR7 and DR9)
54- 57 I4 km/s FWHM ?=- Velocity width, refers to Hα, except
for the starred values, which refer to
HeI λ5876 (1)
58 A1 --- n_FWHM [*] * : No hydrogen in the spectrum, linewidth
refers to the HeI λ5876 line
60- 67 F8.6 d Porb ?=- Orbital period
68 A1 --- u_Porb Uncertainty flag on Porb
69- 76 F8.6 d e_Porb ? rms uncertainty on Porb
78 A1 --- n_Porb [p] Note on Porb (2)
80- 83 A4 --- r_Porb Reference for Porb (3)
86-101 A16 --- Class Classification/Properties (4)
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Note (1): The velocity width refers to the Hα emission line, or in the
case of AM CVn systems, the width of the HeI λ5876 line.
No value is shown for outburst spectra.
Note (2): p : Derived from the superhump period, using equation 1 of
Gansicke et al. (2009MNRAS.397.2170G 2009MNRAS.397.2170G).
Note (4): The spectral classification symbols are as follows:
DN = dwarf nova
SU = SU UMa star
W = white dwarf visible in the spectrum
S = secondary star visible in the spectrum
He = AM CVn star
P = polar
uHe = unusual spectrum
Hi = high inclination, inferred from double-peaked emission lines and/or
linewidth
Ca = CaII emission
O = outburst spectrum
E = confirmed eclipser
Note (3): References as follows:
a = Thorstensen & Skinner (2012, Cat. J/AJ/144/81)
b = Kato et al. (2009PASJ...61..395S 2009PASJ...61..395S)
c = Levitan et al. (2013MNRAS.430..996L 2013MNRAS.430..996L)
d = Coppejans et al. (2014MNRAS.437..510C 2014MNRAS.437..510C)
e = Kato et al. (2012PASJ...64...21K 2012PASJ...64...21K)
f = Woudt et al. (2012, Cat. J/MNRAS/421/2414)
g = Kato et al. (2014PASJ...66...30K 2014PASJ...66...30K)
h = Uemura & Arai (2008), vsnet-alert 9955
i = Maehara (2008), vsnet-alert 10723
j = Kato et al. (2010PASJ...62.1525K 2010PASJ...62.1525K)
k = Patterson et al. (2003PASP..115.1308P 2003PASP..115.1308P)
l = Kato et al. (2013PASJ...65...23K 2013PASJ...65...23K)
m = Boyd (2008), vsnet-outburst 9500
n = Nogami et al. (2004PASJ...56S.155N 2004PASJ...56S.155N)
o = Howell et al. (1990PASP..102..758H 1990PASP..102..758H)
p = Masi (2012), vsnet-alert 14696
q = This paper
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [CRTS]
6- 21 A16 --- CRTS CRTS
23- 28 F6.3 mag FUV ?=- GALEX FUV dereddened magnitude
30- 35 F6.3 mag NUV ?=- GALEX NUV dereddened magnitude
37- 42 F6.3 mag umag7 ?=- SDSS DR7 dereddened u magnitude
44- 49 F6.3 mag gmag7 ?=- SDSS DR7 dereddened g magnitude
51- 56 F6.3 mag g-r7 ?=- SDSS DR7 dereddened g-r colour index
58- 64 F7.1 d MJD7 ?=- SDSS DR7 MJD
66- 71 F6.3 mag umag9 ?=- SDSS DR9 dereddened u magnitude
73- 78 F6.3 mag gmag9 ?=- SDSS DR9 dereddened g magnitude
80- 85 F6.3 mag g-r9 ?=- SDSS DR9 dereddened g-r colour index
87- 93 F7.1 d MJD9 ?=- SDSS DR9 MJD
95- 98 A4 --- Note Notes (1)
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Note (1): Notes as follows:
a = AM CVn binary, also known as PTF1 J043517.73+002940.7
b = New AM CVn binary
c = Helium-enriched CV
d = Area not covered by GALEX GR6 or SDSS DR7
e = No new DR9 measurement
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
6- 24 A19 --- SDSS SDSS designation (JHHMMSS.ss+DDMMSS.s)
26- 29 A4 --- --- [CRTS]
31- 46 A16 --- CRTS CRTS designation (JHHMMSS.s+DDMMSS)
48- 52 F5.2 mag gmag SDSS g magnitude
53 A1 --- n_gmag [a] a: estimated from spectrum, not SDSS
photometry
55- 58 I4 --- Plate SDSS plate number
60- 64 I5 --- MJD SDSS MJD number
66- 68 I3 --- Fiber SDSS fiber number
69 A1 --- n_Fiber [b] b: spectrum taken as part of the SDSS
Legacy survey, using the original SDSS
spectrograph
71- 96 A26 --- Com Comments
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Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [CRTS]
6- 21 A16 --- CRTS CRTS designation (JHHMMSS.s+DDMMSS)
23- 32 A10 "date" Obs.date Observation date
34- 44 A11 --- Note Reference note (1)
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Note (1): Reference note as follows:
WISeREP: http://www.weiwmann.ac.il/astrophysics/wiserep
ATEL #4882: Polshaw et al. (2013ATel.4882....1P 2013ATel.4882....1P)
ATEL #4940: Hachinger et al. (2013ATel.4940....1H 2013ATel.4940....1H)
ATEL #4892: Wyrzykowski et al. (2013ATel.4892....1W 2013ATel.4892....1W)
ATEL #4952: Taubenberger et al. (2013ATel.4952....1T 2013ATel.4952....1T)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Apr-2016