Physics – Optics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005an....326..952n&link_type=abstract
Astronomische Nachrichten, Vol.326, Issue 10, p.952-957
Physics
Optics
4
Stars: Low Mass Stars, Brown Dwarfs
Scientific paper
We have started a corongraphic search for brown dwarfs and planets around young nearby stars within 20 pc of the Sun, using the adaptive optics coronagraph, CIAO, on Subaru. The dynamic range we have achieved is \Delta K = 13 at 2.5'' from the central star. For a typical target with K=7 at 10 pc, the limiting absolute magnitude is M_K=20. We apply two kinematical age criteria to select M and K dwarfs statistically younger than 350Myr. The first criterion is a small velocity deviation from the velocity of LSR. The second is a (U,V,W) velocity vector similar to a particular young moving group. The combination of the age and magnitude limits implies that the mass limit for giant planet detection is about 2M_J. We show a sample image of a target field at 3 pc of the Sun with faint companion candidates, to be followed up for the common proper motion test. We give a brief description of our procedures for data acquisition, reduction, and analysis.
Based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
Fukagawa Misato
Hayashi Saeko Suzuki
Ishii Makoto
Itoh Yusuke
Kudo Taisei
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