A METHANE IMAGING SURVEY FOR T DWARF CANDIDATES IN rho OPHIUCHI

作者：Haisch Karl E Jr^*; Barsony Mary; Tinney Chris

来源：Astrophysical Journal Letters, 2010, 719(1): L90-L94.

DOI：10.1088/2041-8205/719/1/L90

• brown dwarfs
• infrared: stars
• ISM: individual objects (rho Ophiuchi)
• stars: pre-main sequence

We report on the results of the first deep, wide-field, near-infrared methane imaging survey of the. Ophiuchi cloud core to search for T dwarfs. Among the 6587 objects detected, 22 were identified as T dwarf candidates. Brown dwarf models indicate that at the age and distance of the. Ophiuchi cloud, these T dwarf candidates have masses between 1 and 2 Jupiter masses. If confirmed as genuine T dwarfs, these objects would be the youngest, lowest mass, and lowest gravity free-floating objects ever directly observed. The existence of these candidates suggests that the initial mass function of the. Ophiuchi cloud extends well into the regime of planetary mass objects. A large fraction (59% +/- 16%) of our T dwarf candidates appear to be surrounded by circumstellar disks, and thus represents the lowest mass objects yet found to harbor circumstellar disks.

• 出版日期2010-8-10