J/MNRAS/536/1057 CVs from SDSS-V (Inight+, 2025)
Cataclysmic variables from Sloan Digital Sky Survey.
V (2020-2023) identified using machine learning.
Inight K., Gaensicke B.T., Schwope A., Anderson S.F., Breedt E.,
Brownstein J.R., Demasi S., Friedrich S., Hermes J.J., Long K.S.,
Mulvany T., Pallathadka G.A., Salvato M., Scaringi S., Schreiber M.R.,
Stringfellow G.S., Thorstensen J.R., Tovmassian G., Zakamska N.L.
<Mon. Not. R. Astron. Soc. 536, 1057-1076 (2025)>
=2025MNRAS.536.1057I 2025MNRAS.536.1057I (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, cataclysmic ; Stars, white dwarf ; Photometry, SDSS ;
Binaries, orbits
Keywords: white dwarfs - dwarf novae - cataclysmic variables
Abstract:
SDSS-V is carrying out a dedicated survey for white dwarfs, single and
in binaries, and we report the analysis of the spectroscopy of 504
cataclysmic variables (CVs) and CV candidates obtained during the
first 34 months of observations of SDSS-V. We developed a
convolutional neural network (CNN) to aid with the identification of
CV candidates among the over 2 million SDSS-V spectra obtained with
the BOSS spectrograph. The CNN reduced the number of spectra that
required visual inspection to ~=2 per cent of the total. We identified
776 CV spectra among the CNN-selected candidates, plus an additional
27 CV spectra that the CNN misclassified, but that were found
serendipitously by human inspection of the data. Analysing the SDSS-V
spectroscopy and ancillary data of the 504 CVs in our sample, we
report 61 new CVs, spectroscopically confirm 248 and refute 13
published CV candidates, and we report 82 new or improved orbital
periods. We discuss the completeness and possible selection biases of
the machine learning methodology, as well as the effectiveness of
targeting CV candidates within SDSS-V. Finally, we re-assess the space
density of CVs, and find 1.2x10-5pc-3
Description:
Between 2020 and 2023 SDSS-V has carried out, for the first time, a
dedicated survey of white dwarfs, both single and in binaries. We have
analysed the SDSS-V spectra of CVs and CV candidates, and we
discovered 61 new CVs.
The table contains one record for each CV in the sample, and
supersedes the table in Inight et al., 2023MNRAS.525.3597I 2023MNRAS.525.3597I,
Cat. J/MNRAS/525/3597.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 262 504 Summary of the spectroscopic samples used to
train and test the CNN
--------------------------------------------------------------------------------
See also:
J/MNRAS/524/4867 : CVs from SDSS (Inight+, 2023)
J/MNRAS/525/3597 : CVs from SDSS V (Inight+, 2023)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 23 A23 --- SDSS Unique reference for the SDSS object
(JHHMMSS.ss+DDMMSS.s)
25- 53 A29 --- Name Other name (where available)
55- 73 I19 --- GaiaEDR3 ? The unique source_id of the Gaia EDR3
counterpart source_id
76- 86 F11.8 h Per ? Orbital period
89- 97 F9.8 h e_Per ? Orbital period error
99-100 A2 --- n_Per [*: ] Note on Per (1)
103-119 F17.14 mag Gmag ? G-band magnitude from the Gaia EDR3 survey
121-138 F18.13 pc Distance ? Distance from Bailer-Jones et al.
(2021AJ....161..147B 2021AJ....161..147B, Cat. I/352)
140-148 A9 --- Vtype Classification using the taxonomy
defined in 2023MNRAS.524.4867I 2023MNRAS.524.4867I (2)
150-176 A27 --- Ref-disc BibCode of the earliest identification
of this CV
178-196 A19 --- Ref-sp BibCode of the first published spectrum
198-224 A27 --- Ref-P BibCode of the source of the orbital period
226-243 F18.14 deg RAdeg Right ascension (J2000)
245-262 F18.14 deg DEdeg Declination (J2000)
--------------------------------------------------------------------------------
Note (1): Note on Per as follows:
: = tentative value
* = it was derived from superhump periods
Note (2): Note on VType:
: = indicates a tentative value
++ = CVs with unusual state changes
PS = Period bouncers
+E = Eclipsing
--------------------------------------------------------------------------------
Acknowledgements:
Keith Inight, keith.inight(at)gmail.com
References:
Szkody et al., Paper I 2002AJ....123..430S 2002AJ....123..430S
Szkody et al., Paper II 2003AJ....126.1499S 2003AJ....126.1499S
Szkody et al., Paper III 2004AJ....128.1882S 2004AJ....128.1882S
Szkody et al., Paper IV 2005AJ....129.2386S 2005AJ....129.2386S
Szkody et al., Paper V 2006AJ....131..973S 2006AJ....131..973S
Szkody et al., Paper VI 2007AJ....134..185S 2007AJ....134..185S
Szkody et al., Paper VIII 2011AJ....142..181S 2011AJ....142..181S, Cat. J/AJ/142/181
(End) Patricia Vannier [CDS] 29-Dec-2024