Spectroscopy of planetary mass brown dwarfs in Orion
نویسندگان
چکیده
منابع مشابه
Multi-Object and Long-Slit Spectroscopy of Very Low Mass Brown Dwarfs in the Orion Nebular Cluster
We present the results of a H− and K−band multi-object and long-slit spectroscopic survey of substellar mass candidates in the outer regions of the Orion Nebula Cluster. The spectra were obtained using MOIRCS on the 8.2-m Subaru telescope and ISLE on the 1.88-m telescope of Okayama Astronomical Observatory. Eight out of twelve spectra show strong water absorptions and we confirm that their effe...
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We report the results of a deep near infrared (JHK) survey of the outer parts of the Trapezium Cluster with Gemini South/Flamingos. 396 sources were detected in a 26 arcmin area, including 138 brown dwarf candidates, defined as M< 0.075M⊙ for an assumed age of 1 Myr. Only 33 of the brown dwarf candidates are planetary mass candidates (PMCs) with estimated masses in the range 0.003 <M< 0.012M⊙. ...
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The masses and temperatures of young low mass stars and brown dwarfs in starforming regions are not yet well established because of uncertainties in the age of individual objects and the spectral type–temperature scale appropriate for objects with ages of only a few Myr. Using multi-object optical spectroscopy, 45 low-mass stars and brown dwarfs in the Trapezium Cluster in Orion have been class...
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We report the results of a deep photometric search for planets and brown dwarfs in the nearby young OB Upper Scorpius association. We obtained optical (I) and near-infrared (JKs) images around nine very lowmass stars and brown dwarf member candidates of the association, covering a total area of 113 arcmin. Using a point spread function subtraction technique, we have searched for planetary-mass ...
متن کاملOn the origin of brown dwarfs and free-floating planetary mass objects
Briceno et al. report a significantly smaller number of brown dwarfs (BDs) per star in the Taurus-Auriga (TA) pre-main sequence stellar groups than in the central region of the Orion Nebula cluster (ONC). Also, BDs have binary properties that are not compatible with a star-like formation history. It is shown here that these results can be understood if BDs are produced as ejected embryos with a...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society: Letters
سال: 2006
ISSN: 1745-3925,1745-3933
DOI: 10.1111/j.1745-3933.2006.00244.x