Report on 2101.08033v2

Abstract

A planet hardly ever survives the supernova of the host star in a bound orbit, because mass loss in the supernova and the natal kick imparted to the newly formed compact object cause the planet to be ejected.A planet in orbit around a binary has a considerably higher probability to survive the supernova explosion of one of the inner binary stars.In those cases, the planet most likely remains bound to the companion of the exploding star, whereas the compact object is ejected.We estimate this to happen to ∼ 1/33 the circum-binary planetary systems.These planetary orbits tend to be highly eccentric (e > ∼ 0.9), and ∼ 20 % of these planets have retrograde orbits compared to their former binary.The probability that the planet as well as the binary (now with a compact object) remains bound is about ten times smaller (∼ 3 • 10 -3 ).We then expect the Milky way Galaxy to host < ∼ 10 x-ray binaries that are still orbited by a planet, and < ∼ 150 planets that survived in orbit around the compact object's companion.These numbers should be convolved with the fraction of massive binaries that is orbited by a planet.

Authors 2

1. Fedde Fagginger Auer Aachen Leiden Observatory

   Leiden University · Leiden Observatory

   Affiliation as printed

   Leiden Observatory , Leiden University , PO Box 9513 , 2300 RA , Leiden , The Netherlands

   Leiden Observatory, Leiden University, PO Box 9513, 2300 RA, Leiden, The Netherlands

2. Simon Portegies Zwart Aachen Leiden Observatory

   Leiden University · Leiden Observatory

   Affiliation as printed

   Leiden Observatory , Leiden University , PO Box 9513 , 2300 RA , Leiden , The Netherlands

   Leiden Observatory, Leiden University, PO Box 9513, 2300 RA, Leiden, The Netherlands