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NTT Observations Indicate that Brown Dwarfs Form Like Stars

June 07, 2001

Dusty Disks Detected around Very Young Substellar Objects in the Orion
Nebula

An international team of astronomers is announcing today the discovery
of dusty disks surrounding numerous very faint objects that are
believed to be recently formed Brown Dwarfs in the Orion Nebula.

This finding is based on detailed observations with SOFI, a
specialised infrared-sensitive instrument at the ESO 3.5-m New
Technology Telescope at the La Silla Observatory. It is of special
interest because it sheds light on the origin and nature of substellar
objects, known as "Brown Dwarfs".

In particular, these results suggest that Brown Dwarfs share a common
origin with stars and that Brown Dwarfs are more similar in nature to
stars than to planets and, like stars, have the potential to form with
accompanying systems of planets.

Moreover, the presence of dusty protoplanetary disks around the
faintest objects in the Orion Nebula cluster confirms both the
membership of these faint stars in the cluster and their nature as
bona-fide substellar objects, making this the largest population of
Brown Dwarf objects yet known.

These important results are being reported today to the American
Astronomical Society Meeting in Pasadena (California, USA).

For the moment being, the detection of disks around the Brown Dwarf
candidates in the Trapezium Cluster rests entirely on the measurements of
the near-infrared colours of these objects. Additional confirmation of the
presence of such dust disks can be obtained with sensitive infrared
observations made at longer wavelengths. Such observations are possible with
the largest ground-based telescopes like the VLT or with the upcoming
NASA infrared satellite mission (SIRTF).

The full text of this ESO Press Release, with two photos and many
weblinks, is available at:

http://www.eso.org/outreach/press-rel/pr-2001/pr-14-01.htm

European Southern Observatory (ESO)

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