| Issue |
A&A
Volume 468, Number 1, June II 2007
|
|
|---|---|---|
| Page(s) | L5 - L8 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20077258 | |
| Published online | 24 April 2007 | |
Letter to the Editor
The young, wide and very low mass visual binary Lambda Orionis 167*
1
Laboratorio de Astrofisica Espacial y Fisica Fundamental, LAEFF-INTA, Madrid, Spain e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
2
IPAC, Caltech, Pasadena, USA e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
3
Astronomy Department, University of California, Berkeley, USA e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
8
February
2007
Accepted:
11
April
2007
Abstract
Aims.We look for wide, faint companions around members of the 5 Myr Lambda Orionis open cluster.
Methods.We used optical, near-infrared, and Spitzer/IRAC photometry.
Results.We report the discovery of a very wide very low mass visual binary, LOri167, formed by a brown dwarf and a planetary-mass candidate located at 5 arcsec,
which seems to belong to the cluster. We derive Teff of 2125 and 1750 K. If they are members, comparisons with theoretical models indicate masses
of 17
and 8
Mjup, with a projected separation of 2000 AU.
Conclusions.Such a binary system would be difficult to explain in most models, particularly those where substellar objects form in the disks surrounding higher mass stars.
Key words: open clusters and associations: individual: Collinder 69 / stars: low-mass, brown dwarfs / stars: binaries: visual / stars: pre-main sequence
Based on observations carried out with the CFHT, the WHT, the CAHA, the Spitzer and the Keck telescopes.
© ESO, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.