Binary planetary nebulae nuclei towards the Galactic bulge - I. Sample discovery, period distribution, and binary fraction
Brent Miszalski,Brent Miszalski,A. Acker,Anthony F. J. Moffat,Quentin A. Parker,Andrzej Udalski +5 more
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TLDR
In this article, the OGLE microlensing survey with the largest sample of planetary nebulae towards the Galactic bulge was used to systematically search for new binary central stars.Abstract:
Binarity has been hypothesised to play an important, if not ubiquitous, role in the formation of planetary nebulae (PNe). Yet there remains a severe paucity of known binary central stars required to test the binary hypothesis and to place strong constraints on the physics of the common-envelope (CE) phase of binary stellar evolution. Large photometric surveys offer an unrivalled opportunity to efficiently discover many binary central stars. We have combined photometry from the OGLE microlensing survey with the largest sample of PNe towards the Galactic bulge to systematically search for new binaries. A total of 21 periodic binaries were found thereby more than doubling the known sample. The orbital period distribution was found to be best described by CE population synthesis models when no correlation between primary and secondary masses is assumed for the initial mass ratio distribution. A comparison with post-CE white dwarf binaries indicates both distributions are representative of the true post-CE period distribution with most binaries exhibiting periods less than one day. A close binary fraction of 12-21% is derived and is the first robust and independent validation of the previous 10-15% estimate. This suggests that binarity is not a precondition for the formation of PNe and that close binaries do not play a dominant role in the shaping of nebular morphologies. Systematic effects and biases of the survey are discussed with implications for future photometric surveys.read more
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Common envelope evolution: where we stand and how we can move forward
Natalia Ivanova,Stephen Justham,Stephen Justham,Xue-Fei Chen,O. De Marco,Chris L. Fryer,Evghenii Gaburov,Hongwei Ge,Evert Glebbeek,Evert Glebbeek,Zhanwen Han,X.-D. Li,G. Lu,G. Lu,T. R. Marsh,Ph. Podsiadlowski,A. Potter,Noam Soker,Ronald E. Taam,Ronald E. Taam,Thomas M. Tauris,Thomas M. Tauris,E.P.J. van den Heuvel,Ronald F. Webbink +23 more
TL;DR: In this paper, the authors present the current best physical understanding of common envelope evolution (CEE) and highlight areas of consensus and disagreement, and stress ideas which should point the way forward for progress in this important but long-standing and largely unconquered problem.
Journal ArticleDOI
The VMC Survey - I. Strategy and First Data
Maria-Rosa L. Cioni,Maria-Rosa L. Cioni,Gisella Clementini,Léo Girardi,R. Guandalini,Marco Gullieuszik,Brent Miszalski,M. I. Moretti,Vincenzo Ripepi,Stefano Rubele,G. Bagheri,Kenji Bekki,Nicholas Cross,W. J. G. de Blok,R. de Grijs,Jim Emerson,Chris Evans,Brad K. Gibson,E. Gonzales-Solares,Martin Groenewegen,Mike Irwin,Valentin D. Ivanov,James R. Lewis,Marcella Marconi,J. B. Marquette,C. Mastropietro,Ben Moore,Ralf Napiwotzki,Tim Naylor,Joana M. Oliveira,Mike Read,Eckhard Sutorius,J. Th. van Loon,Mark I. Wilkinson,Peter R. Wood +34 more
TL;DR: The first science results, aimed at assessing the scientific quality of the VMC data, include an overview of the distribution of stars in colour-magnitude and colour-colour diagrams, the detection of planetary nebulae and stellar clusters, and the Ks band light-curves of variable stars.
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On the α formalism for the common envelope interaction
Orsola De Marco,Orsola De Marco,Jean-Claude Passy,Jean-Claude Passy,Maxwell Moe,Falk Herwig,Mordecai-Mark Mac Low,Bill Paxton +7 more
TL;DR: In this article, the authors derive a user-friendly prescription for the λ parameter and an improved approximation for the envelope binding energy, thus revising the α formalism, and then determine α both from simulations and from observations in a self-consistent manner.
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Dawes Review 6: The Impact of Companions on Stellar Evolution
Orsola De Marco,Robert G. Izzard +1 more
TL;DR: The role of binary star interactions in a range of astrophysical events, including some that were previously interpreted as being due uniquely to single stellar evolution, has been discussed in this article.
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Binary planetary nebulae nuclei towards the Galactic bulge - II. A penchant for bipolarity and low-ionisation structures
TL;DR: In this article, the discovery of several new binary central stars (CSPN) from the OGLE-III photometric variability survey has significantly increased the number of post-CE PNe available for morphological analysis to 30 PNe.
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