An infrared imaging search for low-mass companions to members of the young nearby β Pic and Tucana/Horologium associations

R. Neuhäuser, E. W. Guenther, J. Alves, N. Huélamo, Th. Ott, A. Eckart

Publications: Contribution to journalArticlePeer Reviewed

Abstract

We present deep high dynamic range infrared images of young nearby stars in the Tucana/Horologium and β Pic associations, all ˜ 10 to 35 Myrs young and at ˜ 10 to 60 pc distance. Such young nearby stars are well-suited for direct imaging searches for brown dwarf and even planetary companions, because young sub-stellar objects are still self-luminous due to contraction and accretion. We performed our observations at the ESO 3.5m NTT with the normal infrared imaging detector SofI and the MPE speckle camera Sharp-I. Three arc sec north of GSC 8047-0232 in Horologium a promising brown dwarf companion candidate is detected, which needs to be confirmed by proper motion and/or spectroscopy. Several other faint companion candidates are already rejected by second epoch imaging. Among 21 stars observed in Tucana/Horologium, there are not more than one to five brown dwarf companions outside of 75 AU (1.5'' at 50 pc); most certainly only
Original languageEnglish
Pages (from-to)535-542
JournalAstronomische Nachrichten
Volume324
Issue number6
Publication statusPublished - 1 Nov 2003

Keywords

  • star formation
  • brown dwarfs
  • massive planets

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