A Survey of Close, Young Stars with SDI at the VLT and MMT

Details A Survey of Close, Young Stars with SDI at the VLT and MMT A Survey of Close, Young Stars with SDI at the VLT and MMT

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917905b&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #179.05; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We discuss the results of a survey of young (<300 Myr), close (<50 pc) stars with the Simultaneous Differential Extrasolar Planet Imager (SDI) implemented at the VLT and the MMT. SDI uses a double Wollaston prism and a quad filter to take images simultaneously at 3 wavelengths surrounding the 1.62 um methane bandhead found in the spectrum of cool brown dwarfs and gas giants. By performing a difference of images in these filters, speckle noise from the primary can be significantly attenuated, resulting in photon and flat-field noise limited data. In our survey data, we achieved H band contrasts > 25000 (5sigma Delta F1(1.575 um) > 10 mag, Delta H > 10.6 mag for a T6 spectral type) at a separation of 0.5 arcsec from the primary star. With this degree of attenuation, we can image (5 sigma detection) a 2-4 Jupiter mass planet at 5 AU around a 30 Myr star at 10 pc. We have obtained complete datasets for 50 stars. We believe that our SDI images are the highest contrast astronomical images ever made from ground or space for methane rich companions.

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