Planet formation in post-common-envelope binaries

Abstract

To understand the evolution of planetary systems, it is important to investigate planets in highly evolved stellar systems, and to explore the implications of their observed properties with respect to potential formation scenarios. Observations suggest the presence of giant planets in post-common-envelope binaries (PCEBs). A particularly well-studied system with planetary masses of 1.7 M_J and 7.0 M_J is NN Ser. We show here that a pure first-generation scenario where the planets form before the common envelope (CE) phase and the orbits evolve due to the changes in the gravitational potential is inconsistent with the current data. We propose a second-generation scenario where the planets are formed from the material that is ejected during the CE, which may naturally explain the observed planetary masses. In addition, hybrid scenarios where the planets form before the CE and evolve due to the accretion of the ejected gas appear as a realistic possibility.

7 pages, 5 figures. Plenary talk given at the 2014 Fall Meeting of the Astronomische Gesellschaft (AG 2014) in Bamberg, submitted for the yearbook series "Reviews in Modern Astronomy", volume 27, of the Astronomische Gesellschaft

References in corpus (8)

• The Transiting Circumbinary Planets Kepler-34 and Kepler-35
• Starbursts near supermassive black holes: young stars in the Galactic Center, and gravitational waves in LISA band
• A Debris Disk Around An Isolated Young Neutron Star
• Low-Mass Binary Induced Outflows from Asymptotic Giant Branch Stars
• Tidal dissipation in binary systems
• Habitable Planet Formation in Binary-Planetary Systems
• First versus second generation planet formation in post common envelope binary (PCEB) planetary systems
• Anomalous X-ray pulsars: Persistent States with Fallback Disks

Cited by in corpus (9)

• Kepler-1647b: the largest and longest-period Kepler transiting circumbinary planet
• Eclipsing time variations in close binary systems: Planetary hypothesis vs. Applegate mechanism
• White dwarf-main sequence binaries from LAMOST: the DR5 catalogue
• Tatooine's Future: The Eccentric Response of Kepler's Circumbinary Planets to Common-Envelope Evolution of their Host Stars
• The Applegate mechanism in Post-Common-Envelope Binaries: Investigating the role of rotation
• Investigation on the Orbital Period Variations of NN Ser: Implications for the Hypothetical Planets, the Applegate Mechanism and the Orbital Stability
• Eclipse Timing Modeling of Three Post-Common Envelope Binaries: Hybrid Solutions
• Lost in space: companions' fatal dance around massive dying stars
• Multiwavelength high-resolution polarimetric imaging of second-generation disc around post-AGB binary IRAS 08544-4431 with SPHERE