A disk survey at the bottom of the IMF

Details A disk survey at the bottom of the IMF A disk survey at the bottom of the IMF

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30395s&link_type=abstract

Spitzer Proposal ID #30395

Physics

Scientific paper

Young brown dwarfs share many properties with classical T Tauri stars. In particular, many of them harbour T Tauri like accretion disks, detected by colour excess in the infrared. Disk frequency and properties do not appear to be significantly different from young solar-mass stars, implying that brown dwarfs probably form in a way similar to stars. Here we propose to probe if the same holds for even lower mass objects with masses below or around the Deuterium burning mass limit of ~12 Mjup. These "isolated planetary mass objects" (IPMO) or "sub brown dwarfs" are the lowest mass isolated objects identified so far, and thus represent the bottom of the IMF. It is unknown if they are the very low mass end of the outcome of the star formation process, ejected stellar embryos, or even ejected giant planets. Since IPMOs are extremely faint in the optical and the near-infrared, studying their mid-infrared properties is one of the very few ways to constrain their origin and early evolution. Recently, a disk has been detected around one IPMO in Chamaeleon, using Spitzer IRAC photometry. We propose to use the same approach to investigate a large sample of 24 IPMOs in young open clusters in Orion. Using the outstanding sensitivity and unique wavelength coverage of IRAC, we will be able to identify how many IPMOs show a disk signature, and derive, for the first time, the disk frequency for this object class. This will allow us to set first constraints for formation scenarios in the IPMO mass range.

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