Planets around extreme horizontal branch stars
Ealeal Bear, Noam Soker

TL;DR
This paper reviews recent findings on how tidal interactions, multiple planets, and stellar radiation influence the survival and detection of planets around extreme horizontal branch stars.
Contribution
It introduces a new understanding of tidal effects on planetary survival, suggests the presence of multiple planets around sdB/sdO stars, and discusses observational signatures of evaporating substellar objects.
Findings
Enhanced planetary survivability due to tidal interactions before common envelope phase
Multiple planets likely exist around many sdB/sdO stars
Detectable Doppler-shifted Balmer lines from evaporated gas around these stars
Abstract
We review three main results of our recent study: * We show that a proper treatment of the tidal interaction prior to the onset of the common envelope (CE) leads to an enhance mass loss. This might increase the survivability of planets and brown dwarfs that enter a CE phase. * From the distribution of planets around main sequence stars, we conclude that around many sdB/sdO stars more than one planet might be present. One of these might have a close orbit and the others at about orbital periods of years or more. * We show that the intense ionizing flux of the extreme horizontal branch star might evaporate large quantities of a very close surviving substellar object. Balmer emission lines from the evaporated gas can be detected via their Doppler shifts.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsStellar, planetary, and galactic studies · Astro and Planetary Science · Astrophysics and Star Formation Studies
