Probing the Upper Scorpius mass function in the planetary-mass regime

N. Lodieu, P. D. Dobbie, N. J. G. Cross, N. C. Hambly, M. A. Read, Robert Blake, D. J. E. Floyd

Research output: Contribution to journalArticlepeer-review

Abstract

We present the results of a deep ZYJ near-infrared survey of 13.5 deg2 in the Upper Scorpius (USco) OB association. We photometrically selected ˜100 cluster member candidates with masses in the range of 30-5 Jupiters, according to state-of-the-art evolutionary models. We identified 67 ZYJ candidates as bona fide members, based on complementary photometry and astrometry. We also extracted five candidates detected with Visible and Infrared Survey Telescope for Astronomy at YJ only. One is excluded using deep optical z-band imaging, while two are likely non-members, and three remain as potential members. We conclude that the USco mass function is more likely decreasing in the planetary-mass regime (although a flat mass function cannot yet be discarded), consistent with surveys in other regions.
Original languageEnglish
Pages (from-to)2474-2482
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume435
Issue number3
DOIs
Publication statusPublished - 1 Nov 2013

Keywords

  • techniques: photometric
  • surveys
  • brown dwarfs
  • stars: low-mass
  • stars: luminosity function
  • mass function
  • infrared: stars

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