Rebassa-Mansergas, A., Zorotovic, M., Schreiber, M. R., Gaensicke, B. T., Southworth, J., Nebot Gómez-Morán, A., Tappert, C., Koester, Detlev, Pyrzas, S., Papadaki, C., Schmidtobreick, Linda, Schwope, A. D. and Toloza, Odette (2012) Post-common envelope binaries from SDSS. XVI, Long orbital period systems and the energy budget of common envelope evolution. Monthly Notices of the Royal Astronomical Society, Vol.423 (No.1). pp. 320-327. doi:10.1111/j.1365-2966.2012.20880.x

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Abstract

Virtually all close compact binary stars are formed through common envelope (CE) evolution. It is generally accepted that during this crucial evolutionary phase a fraction of the orbital energy is used to expel the envelope. However, it is unclear whether additional sources of energy, such as the recombination energy of the envelope, play an important role. Here we report
the discovery of the second and third longest orbital period post-common envelope binaries (PCEBs) containing white dwarf (WD) primaries, i.e. SDSS J121130.94−024954.4 (Porb =
7.818 ± 0.002 d) and SDSS J222108.45+002927.7 (Porb = 9.588 ± 0.002 d), reconstruct their evolutionary history and discuss the implications for the energy budget of CE evolution. We find that, despite their long orbital periods, the evolution of both systems can still be understood without incorporating recombination energy, although at least small contributions of this additional energy seem to be likely. If recombination energy significantly contributes to the ejection of the envelope, more PCEBs with relatively long orbital periods (Porb > 1–3 d)
harbouring massive WDs (Mwd > 0.8 MO) should exist.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Double stars -- Evolution, White dwarf stars
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley
ISSN:	0035-8711
Official Date:	2012
Dates:	Date Event 2012 Published
Volume:	Vol.423
Number:	No.1
Page Range:	pp. 320-327
DOI:	10.1111/j.1365-2966.2012.20880.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Fondo Nacional de Desarrollo Científico y Tecnológico (Chile) (FONDECYT), Chile. Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), Millennium Science Initiative, Chile. Ministerio de Economía, Fomento y Reconstrucción, Centre national d'études spatiales (France) (CNES), Deutsche Forschungsgemeinschaft (DFG), National Science Foundation (U.S.) (NSF), Science and Technology Facilities Council (Great Britain) (STFC), National Research Council Canada (NRCC), Chile. Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), Australian Research Council (ARC), Brazil. Ministério da Ciência e Tecnologia, Argentina. Ministerio de Ciencia, Tecnología e Innovación Productiva, Max-Planck-Institut für Astronomie, Instituto de Astrofísica de Andalucía
Grant number:	3110049 (FONDECYT), 32100026 (CONICYT), Nucleus P10-022-F (MEFR), 1061199 (FONDECYT), 60015 (CNES), GS-2008A-Q-31 (MCTIP), GS-2008B-Q-40 (MCTIP)

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