The young, wide and very low mass visual binary Lambda Orionis 167

Autor:	Nuria Huélamo, D. Barrado y Navascues, Hervé Bouy, Amelia Bayo, Maria Morales-Calderon, John Stauffer
Rok vydání:	2007
Předmět:	Photometry (optics) Physics Stars Space and Planetary Science Brown dwarf Astronomy and Astrophysics Astrophysics Binary system Low Mass Lambda Visual binary Open cluster
Zdroj:	Astronomy & Astrophysics. 468:L5-L8
ISSN:	1432-0746 0004-6361
DOI:	10.1051/0004-6361:20077258
Popis:	We look for wide, faint companions around members of the 5 Myr Lambda Orionis open cluster. We used optical, near-infrared, and Spitzer/IRAC photometry. 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 (20-15) Mjup and 8 (13-7) Mjup, with a projected separation of 2000 AU. 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5a1fe27f7519a78652bb7655bd0c048c https://doi.org/10.1051/0004-6361:20077258 Zobrazit plný text záznamu