J/MNRAS/473/3241 White dwarfs in SDSS Stripe 82 (Hernandez Santisteban+, 2018)
The space density of post-period minimum cataclysmic variables.
Hernandez Santisteban J.V., Knigge C., Pretorius M.L., Sullivan M.,
Warner B.
<Mon. Not. R. Astron. Soc. 473, 3241 (2018)>
=2018MNRAS.473.3241H 2018MNRAS.473.3241H (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, cataclysmic ; Binaries, eclipsing
Keywords: binaries: eclipsing - brown dwarfs - novae - cataclysmic variables -
white dwarfs
Abstract:
Binary evolution theory predicts that accreting white dwarfs with
substellar companions dominate the Galactic population of cataclysmic
variables (CVs). In order to test these predictions, it is necessary
to identify these systems, which may be difficult if the signatures of
accretion become too weak to be detected. The only chance to identify
such 'dead' CVs is by exploiting their close binary nature. We
have therefore searched the Sloan Digital Sky Survey (SDSS) Stripe 82
area for apparently isolated white dwarfs that undergo eclipses by a
dark companion. We found no such eclipses in either the SDSS or
Palomar Transient Factory data sets among our sample of 2264
photometrically selected white dwarf candidates within Stripe 82. This
null result allows us to set a firm upper limit on the space density,
ρ0, of dead CVs. In order to determine this limit, we have used Monte
Carlo simulations to fold our selection criteria through a simple
model of the Galactic CV distribution. Assuming a TWD=7500K, the
resulting 2σ limit on the space density of dead CVs is
ρ0≲2x10-5pc-3, where TWD is the typical effective temperature
of the white dwarf in such systems.
Description:
We present the photometrically selected white dwarfs in SDSS Stripe
82, used to find total eclipses or dropouts in the SDSS and PTF
surveys. The Table presents the location as measured by SDSS as well
as average photometric values of each WD. This data corresponds to the
Table B1 in the paper.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 73 2561 SDSS Stripe 82 white dwarfs photometry
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See also:
J/MNRAS/382/515 : SDSS ultracool and halo WD candidates (Vidrih+, 2007)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID [0/2560] Identification number
6- 14 F9.5 deg RAdeg Right Ascension (J2000)
16- 23 F8.5 deg DEdeg Declination (J2000)
25- 29 F5.2 --- gmagSDSS ?=99 Mean magnitude in SDSS g
31- 35 F5.2 --- gmagPTF ?=99 Mean magnitude in PTF g
37- 41 F5.2 --- em_gmagPTF ?=99 Mean error in PTF g magnitude
43- 47 F5.2 --- e_gmagPTF ?=99 RMS of PTF g magnitude
49- 54 F6.3 --- rmagSDSS ?=99 Mean magnitude in SDSS R
56- 60 F5.2 --- rmagPTF ?=99 Mean magnitude in PTF R
62- 66 F5.2 --- em_rmagPTF ?=99 Mean error in PTF R magnitude
68- 73 F6.3 --- e_rmagPTF ?=99 RMS of PTF R magnitude
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Acknowledgements:
J.V. Hernandez Santisteban, j.v.hernandez(at)uva.nl
(End) J.V. Hernandez Santisteban [Amsterdam univ.], P. Vannier [CDS] 31-Aug-2017