A Direct Imaging Search for Substellar-Mass Companions around Solar-Type Stars in the Upper-Sco OB Association

Details A Direct Imaging Search for Substellar-Mass Companions around Solar-Type Stars in the Upper-Sco OB Association A Direct Imaging Search for Substellar-Mass Companions around Solar-Type Stars in the Upper-Sco OB Association

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2210t&link_type=abstract

American Astronomical Society, DPS meeting #39, #22.10; Bulletin of the American Astronomical Society, Vol. 39, p.451

Astronomy and Astrophysics

Astronomy

Scientific paper

We present first results from our search for brown dwarf and giant planet companions around G and K type stars in the Upper Sco OB association. Our survey is designed to detect companions as faint as I=20 about 2 arcsec from the star. This sensitivity corresponds to 10MJ at 300 AU according to current evolutionary models. The host stars were selected from Prebisch et al. (2001) using proper motions. The substellar candidates were selected using Optical/Near Infrared colors derived from images that were obtained using 1.5m Carlos Sánchez Telescope and the IAC-80 Telescope, both located in Teide Observatory (Canary Islands).
From a sample of 65 stars we have obtained 80 candidate companions.We have obtained optical spectra for 8 of these objects using WHT-ISIS and CTIO 4m -RCSpec. We have found no confirmed substellar companions in those candidates, which represents only 10% of our complete list. We plan to apply for spectroscopic follow-up for the remaining 90% of the candidates.

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