Substellar companions and the formation of hot subdwarf stars

Stephan Geier, Ulrich Heber, Alfred Tillich, Heiko Hirsch, Thomas Kupfer, Veronika Schaffenroth, Lew Classen, Pierre F. L. Maxted, Roy H. Ostensen, Brad N. Barlow, Tom R. Marsh, Boris T. Gaensicke, Ralf Napiwotzki, Simon J. O'Toole, Eike W. Guenther

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)
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We give a brief review over the observational evidence for close substellar companions to hot subdwarf stars. The formation of these core helium-burning objects requires huge mass loss of their red giant progenitors. It has been suggested that besides stellar companions substellar objects in close orbits may be able to trigger this mass loss. Such objects can be easily detected around hot subdwarf stars by medium or high resolution spectroscopy with an RV accuracy at the km s(-1)-level. Eclipsing systems of Vir type stick out of transit surveys because of their characteristic light curves. The best evidence that substellar objects in close orbits around sdBs exist and that they are able to trigger the required mass loss is provided by the eclipsing system SDSS J0820+0008, which was found in the course of the MUCHFUSS project. Furthermore, several candidate systems have been discovered.

Original languageEnglish
Title of host publicationPlanetary systems beyond the main sequence
EditorsS Schuh, H Drechsel, U Heber
Place of PublicationMelville
PublisherAmerican Institute of Physics (AIP)
Number of pages7
ISBN (Print)978-0-7354-0886-9
Publication statusPublished - 2011


  • stars:binaries
  • stars:subdwarfs


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