Planeten um entwickelte Binärsysteme

• Antragsteller: Professor Dr. Robi Stefan Banerjee
• Fachliche Zuordnung: Astrophysik und Astronomie
• Förderung: Förderung von 2018 bis 2024
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 400397976

• Erstellungsjahr: 2024

Zusammenfassung der Projektergebnisse

The aim of this project was to acquire further insight on the question whether first generation planets around post-common-envelope binaries (PCEBs) are a viable scenario, or whether second generation planets, which are built up from the backfalling envelope are more likely. This study is particular interesting in the light of the many binary systems hosting a white dwarf (more thant 3000 are known from the SDSS data) and about 200 underwent a recent common envelope phase. For the performed numerical simulations with the FLASH code within this project we used the parameters of the NNSer system, one of the best studied PCEB cases. In particular, for NNSer we know the age of the very young primary white dwarf, which is about a million years. Hence, one could exclude slow planet formation scenarios for this system if first-generation planets can be definitely ruled out. Such a young second-generation planet, formed from the backfalling material must still be quite hot due to contraction and hence, possibly detectable in the infrared. Additionally, we further improved our calculations on the Applegate mechanism. Within this project we will also continued our observational strategy to directly “observe” the proposed planets using planetary evolution calculations.

Projektbezogene Publikationen (Auswahl)

• A new approach to distant solar system object detection in large survey data sets. Astronomy & Astrophysics, 615, A159.
  Perdelwitz, V.; Völschow, M. & Müller, H. M.
  
• Applegate mechanism in post-common-envelope binaries: Investigating the role of rotation. Astronomy & Astrophysics, 615, A81.
  Navarrete, F. H.; Schleicher, D. R. G.; Zamponi, Fuentealba J. & Völschow, M.
  
• Long-term variations in the X-ray activity of HR 1099. Astronomy & Astrophysics, 616, A161.
  Perdelwitz, V.; Navarrete, F. H.; Zamponi, J.; Mennickent, R. E.; Völschow, M.; Robrade, J.; Schneider, P. C.; Schleicher, D. R. G. & Schmitt, J. H. M. M.
  
• Physics of the Applegate mechanism: Eclipsing time variations from magnetic activity. Astronomy & Astrophysics, 620, A42.
  Völschow, M.; Schleicher, D. R. G.; Banerjee, R. & Schmitt, J. H. M. M.
  
• Magneto-hydrodynamical origin of eclipsing time variations in post-common-envelope binaries for solar mass secondaries. Monthly Notices of the Royal Astronomical Society.
  Navarrete, Felipe H.; Schleicher, Dominik R. G.; Käpylä, Petri J.; Schober, Jennifer; Völschow, Marcel & Mennickent, Ronald E.
  
• Origin of eclipsing time variations in post-common-envelope binaries: Role of the centrifugal force. Astronomy & Astrophysics, 667, A164.
  Navarrete, Felipe H.; Schleicher, Dominik R. G.; Käpylä, Petri J.; Ortiz-Rodríguez, Carolina A. & Banerjee, Robi
  
• Origin of eclipsing time variations: Contributions of different modes of the dynamo-generated magnetic field. Astronomy & Astrophysics, 663, A90.
  Navarrete, Felipe H.; Käpylä, Petri J.; Schleicher, Dominik R. G.; Ortiz, Carolina A. & Banerjee, Robi
  
• Eclipsing Time Variations from 3D Magnetohydrodynamical Simulations, Universiät Hamburg, Physics Department, May
  Navarrete, F.
  
• Effects of the centrifugal force in stellar dynamo simulations. Astronomy & Astrophysics, 678, A9.
  Navarrete, Felipe H.; Käpylä, Petri J.; Schleicher, Dominik R. G. & Banerjee, Robi