SIMBAD references

2006MNRAS.373L..60L - Mon. Not. R. Astron. Soc., 373, L60-L64 (2006/November-3)

Spectroscopy of planetary mass brown dwarfs in Orion.


Abstract (from CDS):

We report the results of near infrared spectroscopy of 11 luminosity-selected candidate planetary mass objects (PMOs) in the Trapezium Cluster with Gemini South/Gemini Near-Infrared Spectrograph and Gemini North/Near-Infrared Imager. Six have spectral types ≥M9, in agreement with expectations for PMOs. Two have slightly earlier types, and three are much earlier types which are probably field stars. Four of the six sources with types ≥M9 have pseudo-continuum profiles which confirm them as low gravity cluster members. The gravity status of the other cool dwarfs is less clear but these remain candidate PMOs. The derived number fraction of PMOs with M = 3-15 MJupis 1-14 per cent, these broad limits reflecting the uncertainty in source ages. However, the number fraction with M < 20MJupis at least 5 per cent. These detections add significantly to the body of evidence that a planetary mass population is produced by the star formation process.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): stars: low mass, brown dwarfs - stars: formation

Nomenclature: Tables 1, 2: [OW94] SSs-MSS N=11 added.

Simbad objects: 23

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