A Spitzer IRAC Direct Imaging Substellar Companion Search Around 89 M, L, and T Dwarf Systems

Details A Spitzer IRAC Direct Imaging Substellar Companion Search Around 89 M, L, and T Dwarf Systems A Spitzer IRAC Direct Imaging Substellar Companion Search Around 89 M, L, and T Dwarf Systems

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1158..227c&link_type=abstract

EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY: Proceedings of the International Conference. AIP Conference Proceedings, V

Astronomy and Astrophysics

Astronomy

1

Astrometric And Interferometric Instruments, Substellar Companions, Planets, Masses, Low Luminosity Stars, Subdwarfs, And Brown Dwarfs

Scientific paper

We report observational techniques, results, and Monte Carlo population analyses for a Spitzer IRAC substellar companion search around 89 M, L, and T dwarf systems. For the typical target star distance, the survey is sensitive to T-dwarf/Y-dwarf companions with temperatures down to ~600 K. This survey therefore represents the most sensitive population study of mid-to wide-separation (greater than ~40 AU) substellar companions to low mass stars and brown dwarfs. Based on IRAC color-color identfication, and archival ground-based data, we find that no system shows positive evidence of a substellar companion (searchable separation ~3 arcsec to ~3 arcmin; projected separation ~40-2000 AU at the median target distance). Monte Carlo population analyses reveal that, for an example 1000 K substellar population, the 40-2000 AU semi-major-axis companion fraction is <=3.3%. For an example 633 K (Y-dwarf) companion population, the companion fraction is less than ~20%, for the 200-800 AU semi-major axis range. To the best of our knowledge, this Y-dwarf value represents the first constraints ever placed on the Y-dwarf companion population, for this semi-major axis regime.

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