The ESO supernovae type Ia progenitor survey (SPY): the radial velocities of 643 DA white dwarfs
Close double degenerate binaries are one of the favoured progenitor channels for type Ia supernovae, but it is unclear how many suitable systems there are in the Galaxy. We report results of a large radial velocity survey for double degenerate (DD) binaries using the UVES spectrograph at the ESO VLT...
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
25 June 2020
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| In: |
Astronomy and astrophysics
Year: 2020, Volume: 638 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/201629648 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/201629648
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| Author Notes: | R. Napiwotzki, C.A. Karl, T. Lisker, S. Catalan, H. Drechsel, U. Heber, D. Homeier, D. Koester, B. Leibundgut, T.R. Marsh, S. Moehler, G. Nelemans, D. Reimers, A. Renzini, A. Ströer, and L. Yungelson |
MARC
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| 100 | 1 | |a Napiwotzki, Ralf |e VerfasserIn |0 (DE-588)1218720905 |0 (DE-627)1734280956 |4 aut | |
| 245 | 1 | 4 | |a The ESO supernovae type Ia progenitor survey (SPY) |b the radial velocities of 643 DA white dwarfs |c R. Napiwotzki, C.A. Karl, T. Lisker, S. Catalan, H. Drechsel, U. Heber, D. Homeier, D. Koester, B. Leibundgut, T.R. Marsh, S. Moehler, G. Nelemans, D. Reimers, A. Renzini, A. Ströer, and L. Yungelson |
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| 520 | |a Close double degenerate binaries are one of the favoured progenitor channels for type Ia supernovae, but it is unclear how many suitable systems there are in the Galaxy. We report results of a large radial velocity survey for double degenerate (DD) binaries using the UVES spectrograph at the ESO VLT (ESO SN Ia Progenitor surveY - SPY). Exposures taken at different epochs are checked for radial velocity shifts indicating close binary systems. We observed 689 targets classified as DA white dwarfs (displaying hydrogen-rich atmospheres), of which 46 were found to possess a cool companion. We measured radial velocities (RV) of the remaining 643 DA white dwarfs. We managed to secure observations at two or more epochs for 625 targets, supplemented by eleven objects meeting our selection criteria from literature. The data reduction and analysis methods applied to the survey data are described in detail. The sample contains 39 double degenerate binaries, only four of which were previously known. Twenty are double-lined systems, in which features from both components are visible, the other 19 are single-lined binaries. We provide absolute RVs transformed to the heliocentric system suitable for kinematic studies. Our sample is large enough to sub-divide by mass: 16 out of 44 low mass targets (<= 0.45 M-circle dot) are detected as DDs, while just 23 of the remaining 567 targets with multiple spectra and mass > 0.45 M-circle dot are double. The detected fraction amongst the low mass objects (36.4 +/- 7.3%) is significantly higher than for the higher-mass, carbon-oxygen core dominated part of the sample (3.9 +/- 0.8%), but it is much lower than expected from the detection efficiency for companion masses of 0.05 M-circle dot or higher and a 100% binary fraction. This suggests either companion stars of with a mass below 0.05 M-circle dot or some of the low mass white dwarfs are single. | ||
| 650 | 4 | |a all-sky survey | |
| 650 | 4 | |a am cvn | |
| 650 | 4 | |a atmospheric parameters | |
| 650 | 4 | |a binaries: close | |
| 650 | 4 | |a binaries: spectroscopic | |
| 650 | 4 | |a cambridge-tololo survey | |
| 650 | 4 | |a cool companions | |
| 650 | 4 | |a double-degenerate | |
| 650 | 4 | |a evolutionary models | |
| 650 | 4 | |a numerical simulations | |
| 650 | 4 | |a population synthesis | |
| 650 | 4 | |a short-period | |
| 650 | 4 | |a supernovae: general | |
| 650 | 4 | |a techniques: radial velocities | |
| 650 | 4 | |a white dwarfs | |
| 700 | 1 | |a Karl, C. A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Lisker, Thorsten |d 1978- |e VerfasserIn |0 (DE-588)1020741287 |0 (DE-627)691330069 |0 (DE-576)361921675 |4 aut | |
| 700 | 1 | |a Catalan, S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Drechsel, H. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Heber, U. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Homeier, D. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Koester, D. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Leibundgut, B. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Marsh, T. R. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Moehler, S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Nelemans, G. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Reimers, D. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Renzini, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ströer, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Yungelson, L. |e VerfasserIn |4 aut | |
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