University of Hertfordshire

BD+20 1790 b : chronicle of an exoplanetary discovery

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

  • M. Hernan-Obispo
  • M.C. Galvez-Ortiz
  • G. Anglada-Escude
  • S.R. Kane
  • E. De Castro
  • M. Cornide
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Original languageEnglish
Title of host publicationProcs of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun
PublisherAmerican Institute of Physics
ISBN (Print)978-0-7354-0627-8
Publication statusPublished - 2009

Publication series

NameAIP Conf Procs


In this contribution we report evidence for a planetary companion around a young and active late-type K star. Our group has been developing a study of stellar activity and kinematics for this star over the past years. Previous results show a high level of stellar activity, with the presence of prominence-like structures, spots on surface and strong flare events. Radial velocity (RV) variations with a semi-amplitude of up to 1 km s−1 were detected. When the nature of these variations were investigated it was found that they are not due to stellar activity. Based upon the analysis of bisector velocity span, as well as Ca II H & K emission, we report that the best explanation for RV variation is the presence of a sub-stellar companion. The Keplerian fit of the RV data yields an orbital solution for a close-in massive planet with an orbital period of 7.783 days. Also, the presence of this close-in massive planet chould be an interpretation for the high level of stellar activity detected.


Original paper can be found at: Copyright 2009,A merican Institute of Physics. [Full text of this article is not available in the UHRA]

ID: 165652