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A volume-limited sample of cataclysmic variables from Gaia DR2: space density and population properties

A volume-limited sample of cataclysmic variables from Gaia DR2: space density and population properties
A volume-limited sample of cataclysmic variables from Gaia DR2: space density and population properties
We present the first volume-limited sample of cataclysmic variables (CVs), selected using the accurate parallaxes provided by the second data release (DR2) of the European Space Agency Gaia space mission. The sample is composed of 42 CVs within 150 pc, including two new systems discovered using the Gaia data, and is (77±10) per cent complete. We use this sample to study the intrinsic properties of the Galactic CV population. In particular, the CV space density we derive, ρ=(4.8+0.6−0.8)×10−6pc−3⁠, is lower than that predicted by most binary population synthesis studies. We also find a low fraction of period bounce CVs, seven per cent, and an average white dwarf mass of ⟨MWD⟩=(0.83±0.17)M⊙⁠. Both findings confirm previous results, ruling out the presence of observational biases affecting these measurements, as has been suggested in the past. The observed fraction of period bounce CVs falls well below theoretical predictions, by at least a factor of five, and remains one of the open problems in the current understanding of CV evolution. Conversely, the average white dwarf mass supports the presence of additional mechanisms of angular momentum loss that have been accounted for in the latest evolutionary models. The fraction of magnetic CVs in the 150 pc sample is remarkably high at 36 per cent. This is in striking contrast with the absence of magnetic white dwarfs in the detached population of CV progenitors, and underlines that the evolution of magnetic systems has to be included in the next generation of population models.
Hertzsprung, Russell and colour, magnitude diagrams, novae, cataclysmic variables, stars: evolution, stars: statistics
0035-8711
3799-3827
Pala, A.F.
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Gänsicke, B.T.
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Breedt, E.
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Knigge, C.
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Hermes, J.J.
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Fusillo, N.P. Gentile
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Hollands, M.A.
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Naylor, T.
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Pelisoli, I.
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Schreiber, M.R.
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Toonen, S.
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Aungwerojwit, A.
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Cukanovaite, E.
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Dennihy, E.
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Manser, C.J.
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Pretorius, M.L.
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Scaringi, S.
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Toloza, O.
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Pala, A.F.
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Gänsicke, B.T.
e53b02f6-aee1-4f86-a12e-d56049f44fb1
Breedt, E.
8a142b4e-67c2-4d4e-a7d5-9d179a63b2ec
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Hermes, J.J.
45cbb77b-f578-471a-8796-8cf706694089
Fusillo, N.P. Gentile
be41130b-4481-4b2b-a6a6-175722b5dbc1
Hollands, M.A.
4053f8e8-3923-436f-8ce4-c9dda317d8ea
Naylor, T.
dd5db00d-078e-4f86-b95b-28fe3d38e34e
Pelisoli, I.
c73d0080-acc2-424a-9924-b928bd734c17
Schreiber, M.R.
d452f570-6b17-473d-baf6-022cbf859b78
Toonen, S.
957e428a-ca18-4f9f-8a92-ff1bc92451c9
Aungwerojwit, A.
cde29d9a-8a76-4b9b-bde4-f07890c8ba02
Cukanovaite, E.
c9b09f9a-5196-498c-bcc4-b6a04707c9bb
Dennihy, E.
6350942e-4dc9-4557-8346-057e8cbd4c5b
Manser, C.J.
e41210ef-8bb6-4746-a823-1a4c9a189143
Pretorius, M.L.
ce6e49d6-c48e-495f-94bf-96bb8388bd07
Scaringi, S.
88701970-a1b9-41fe-bf55-886716ee3374
Toloza, O.
f2f34065-38cf-4375-9bf5-c4245b9d636c

Pala, A.F., Gänsicke, B.T., Breedt, E., Knigge, C., Hermes, J.J., Fusillo, N.P. Gentile, Hollands, M.A., Naylor, T., Pelisoli, I., Schreiber, M.R., Toonen, S., Aungwerojwit, A., Cukanovaite, E., Dennihy, E., Manser, C.J., Pretorius, M.L., Scaringi, S. and Toloza, O. (2020) A volume-limited sample of cataclysmic variables from Gaia DR2: space density and population properties. Monthly Notices of the Royal Astronomical Society, 494 (3), 3799-3827. (doi:10.1093/mnras/staa764).

Record type: Article

Abstract

We present the first volume-limited sample of cataclysmic variables (CVs), selected using the accurate parallaxes provided by the second data release (DR2) of the European Space Agency Gaia space mission. The sample is composed of 42 CVs within 150 pc, including two new systems discovered using the Gaia data, and is (77±10) per cent complete. We use this sample to study the intrinsic properties of the Galactic CV population. In particular, the CV space density we derive, ρ=(4.8+0.6−0.8)×10−6pc−3⁠, is lower than that predicted by most binary population synthesis studies. We also find a low fraction of period bounce CVs, seven per cent, and an average white dwarf mass of ⟨MWD⟩=(0.83±0.17)M⊙⁠. Both findings confirm previous results, ruling out the presence of observational biases affecting these measurements, as has been suggested in the past. The observed fraction of period bounce CVs falls well below theoretical predictions, by at least a factor of five, and remains one of the open problems in the current understanding of CV evolution. Conversely, the average white dwarf mass supports the presence of additional mechanisms of angular momentum loss that have been accounted for in the latest evolutionary models. The fraction of magnetic CVs in the 150 pc sample is remarkably high at 36 per cent. This is in striking contrast with the absence of magnetic white dwarfs in the detached population of CV progenitors, and underlines that the evolution of magnetic systems has to be included in the next generation of population models.

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1907.13152v1 AM - Author's Original
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A Volume-limited Sample of Cataclysmic Variables from Gaia DR2 Space Density and Population Properties - Accepted Manuscript
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Accepted/In Press date: 17 March 2020
e-pub ahead of print date: 2 April 2020
Published date: May 2020
Additional Information: arxiv copy is AM
Keywords: Hertzsprung, Russell and colour, magnitude diagrams, novae, cataclysmic variables, stars: evolution, stars: statistics

Identifiers

Local EPrints ID: 433914
URI: http://eprints.soton.ac.uk/id/eprint/433914
ISSN: 0035-8711
PURE UUID: a9cb9655-6210-4bc6-9ee0-b2bcad79e111

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Date deposited: 06 Sep 2019 16:30
Last modified: 26 Feb 2021 05:01

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