J/MNRAS/448/2260 White dwarf candidates in SDSS DR10 (Gentile Fusillo+, 2015)
A photometric selection of white dwarf candidates in Sloan Digital Sky Survey
Data Release 10.
Gentile Fusillo N.P., Gansicke B.T., Greiss S.
<Mon. Not. R. Astron. Soc., 448, 2260-2274 (2015)>
=2015MNRAS.448.2260G 2015MNRAS.448.2260G
ADC_Keywords: Surveys ; Stars, white dwarf ; Photometry, SDSS ; Proper motions ;
Spectra, optical
Keywords: catalogues - surveys - white dwarfs
Abstract:
We present a method which uses cuts in colour-colour and reduced
proper motion-colour space to select white dwarfs without the recourse
to spectroscopy while allowing an adjustable compromise between
completeness and efficiency. Rather than just producing a list of
white dwarf candidates, our method calculates a probability of being a
white dwarf (PWD) for any object with available multiband photometry
and proper motion. We applied this method to all objects in the Sloan
Digital Sky Survey (SDSS) Data Release 10 (DR10) photometric footprint
and to a few selected sources in DR7 which did not have reliable
photometry in DR9 or DR10. This application results in a sample of 61
969 DR10 and 3799 DR7 photometric sources with calculated PWD from
which it is possible to select a sample of ∼23000 high-fidelity white
dwarf candidates with Teff≳7000K and g≤19. This sample contains
over 14000 high confidence white dwarfs candidates which have not yet
received spectroscopic follow-up. These numbers show that, to date,
the spectroscopic coverage of white dwarfs in the SDSS photometric
footprint is, on average, only ∼40 percent complete. While we describe
here in detail the application of our selection to the SDSS catalogue,
the same method could easily be applied to other multicolour, large
area surveys. We also publish a list of 8701 bright (g≤19) white
dwarfs with SDSS spectroscopy, of which 1781 are new identifications
in DR9/DR10.
Description:
This table contains all SDSS objects for which we calculated
probabilities of being white dwarfs. For objects with available SDSS
spectroscopy it also includes the result of our classification based
on spectral type.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 478 65768 SDSS-DR10 white dwarf candidates
spectra.dat 68 42895 List of available SDSS spectra
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See also:
J/AJ/126/1023 : White Dwarfs in the SDSS (Harris+, 2003)
J/AJ/130/734 : Magnetic white dwarfs from SDSS DR2 & DR3 (Vanlandingham+, 20
J/AJ/131/582 : Cool white dwarfs in the SDSS (Kilic+, 2006)
J/AJ/132/676 : SDSS hot DB white dwarfs (Eisenstein+, 2006)
J/ApJ/607/426 : Catalog of white dwarfs in SDSS-DR1 (Kleinman+, 2004)
J/ApJS/167/40 : SDSS4 confirmed white dwarfs catalog (Eisenstein+, 2006)
J/ApJ/647/303 : Spectroscopic survey of hypervelocity stars (Brown+, 2006)
J/ApJ/660/311 : Hypervelocity stars. II. (Brown+, 2007)
J/ApJ/671/1708 : Hypervelocity stars. III (Brown+, 2007)
J/ApJS/204/5 : SDSS DR7 white dwarf catalog (Kleinman+, 2013)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [SDSS]
5- 24 A20 --- SDSS SDSS object name (JHHMMSS.ss+DDMMSSs.)
26- 44 I19 --- photID3 ?=- Unique ID identifying the photometric
source in SDSS-III
46- 63 I18 --- photID2 ?=- Unique ID identifying the photometric
source in SDSS-II
65- 84 E20.16 deg RAdeg Right ascension (J2000)
86-106 E21.17 deg DEdeg Declination (J2000)
108-116 E9.7 --- pWD [0/1] The probability of being a WD computed
for this object
118-126 F9.5 mag umag ?=-99 SDSS u band PSF magnitude
128-140 E13.9 mag e_umag ?=-99 SDSS u band PSF magnitude uncertainty
142-150 F9.5 mag gmag ?=-99 SDSS g band PSF magnitude
152-161 E10.6 mag e_gmag ?=-99 SDSS g band PSF magnitude uncertainty
163-171 F9.5 mag rmag ?=-99 SDSS r band PSF magnitude
173-185 E13.9 mag e_rmag ?=-99 SDSS r band PSF magnitude uncertainty
187-194 F8.5 mag imag SDSS i band PSF magnitude
196-208 E13.9 mag e_imag SDSS i band PSF magnitude uncertainty
209-217 F9.5 mag zmag ?=-99 SDSS z band PSF magnitude
219-231 F13.9 mag e_zmag ?=-99 SDSS z band PSF magnitude uncertainty
233-247 E15.9 mas/yr pmRA Proper motion in right ascension
249-257 F9.6 mas/yr e_pmRA Proper motion in right ascension uncertainty
259-273 E15.9 mas/yr pmDE Proper motion in declination
275-283 F9.6 mas/yr e_pmDE Proper motion in declination uncertainty
285-288 A4 --- Inst [SDSS BOSS-] Instrument used for the most
recent spectrum (SDSS, BOSS, or "-")
290-308 I19 --- specID3 ?=- Unique ID identifying the spectroscopic
source in SDSS-III
310-327 I18 --- specID2 ?=- Unique ID identifying the spectroscopic
source in SDSS-II
329-340 A12 --- Class Classification of the object based on our
visual inspection of its spectrum (1)
342-358 A17 --- Cl13 Classification of the object according to
Kleinman et al. (2013, Cat. J/ApJS/204/5)
360-426 A67 --- Cl15 Classification of the object according to
Kepler et al. (2015MNRAS.446.4078K 2015MNRAS.446.4078K)
428 I1 --- f1 [0/1] 1 if the object was part of the BOSS WD
and subdwarfs ancillary program
430 I1 --- f2 [0/1] 1 if the objects was classified as a WD
based on available SDSS spectra
432 I1 --- f3 [0/1] 1 if the objects was classified as a WD
based on available BOSS spectra
434 I1 --- f4 [0/2] Other classification code (2)
436-476 A41 --- Sclass Currently available Simbad classification
478 I1 --- R7e [0/1] 1 if the objects was included as part
of the DR7 extension (Sect. 7.3)
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Note (1): Human classes are:
--- = no available spectrum so no classification assigned
CV = Cataclysmic Variable star
DA = white dwarfs with H lines
DAB = white dwarfs with H lines and neutral He lines
DABZ = white dwarfs with H lines, neutral He lines and Ca H & K lines
DAO = white dwarfs with H lines and He II lines
DAZ = white dwarfs with H lines and Ca H & K lines
DB = white dwarfs with neutral He lines
DBZ = white dwarfs with neutral He lines and Ca H & K lines
DC = white dwarfs with feature-less spectra
DQ = white dwarfs with molecular C absorptions
DZ = white dwarfs with Ca H & K lines
MS = Main sequence star
MWD = Magnetic white dwarfs
WDMS = (White Dwarf - Main Sequence binary)
NLHS = (narrow-line hydrogen stars) includes early-type MS stars, subdwarfs,
extreme horizontal branch stars or very metal poor halo stars.
QSO = Quasar
Galaxy = Galaxy
Unclassified = Spectra which we were unable to classify
Unreliable = Unreliable spectra
Note (2): Classification code as follows:
1 = the objects was classified as a WD in the the hypervelocity stars
spectroscopic survey (Brown et al., 2006, Cat. J/ApJ/647/303,
2007, Cat. J/ApJ/660/311 and J/ApJ/671/1708)
2 = the object was classified as something other than a WD
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Byte-by-byte Description of file: spectra.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [SDSS]
5- 23 A19 --- SDSS SDSS objects name (JHHMMSS.ss+DDMMSS.s)
26- 29 I4 --- Plate Unique ID identifing a Sloan plate
31- 35 I5 d MJD Modified Julian date of acquisition of spectrum
37- 40 I4 --- Fiber Unique ID identifing a fiber on a plate
41- 50 E10.7 --- pWD [0/1] Probability of being a WD computed for
this object
53- 65 A13 --- Class Classification of the object based on our
visual inspection of its spectrum
67- 68 I2 --- Nsp [1/16] Number of available spectra for this object
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Acknowledgements:
Nicola Gentile Fusillo, n.p.gentile-fusillo(at)warwick.ac.uk
History:
* 22-May-2015: First on-line version
* 06-Oct-2015: File spectra.dat added (from electronic version of the paper)
* 07-Oct-2015: New version of catalog.dat, from author:
"The errors in the original table regarded some rounding mistakes that
affected the coordinates both in the given SDSS names and in the ra
and dec columns. The differences are only marginally significant"
The changes concern the columns SDSS, RAdeg and DEdeg (SDSS-DR12 values)
(End) N.P. Gentile Fusillo [Univ. Warwick], Patricia Vannier [CDS] 22-May-2015