Observations from the Heliospheric Imagers ( HI-1 ) on both the STEREO spacecraft have been analysed to search for bright low mass eclipsing binaries ( EBs ) and potential brown dwarf transits and to determine the radii of the companions .
A total of 9 EB candidates have been found , ranging in brightness from V = 6.59 Â mag to V = 11.3 Â mag , where the radius of the companion appears to be less than 0.4 R _ { \odot } , with a diverse range of host temperatures , from 4074Â K to 6925Â K. Both components of one candidate , BD-07Â 3648 , appear to be less than 0.4 R _ { \odot } and this represents a particularly interesting system for further study .
The shapes of the eclipses in some cases are not clear enough to be certain they are total and the corresponding radii found should therefore be considered as lower limits .
The EBs reported in this paper have either been newly found by the present analysis , or previously reported to be eclipsing by our earlier STEREO /HI-1 results .
One of the new objects has subsequently been confirmed using archival SuperWASP data .
This study was made possible by using an improved matched filter extraction algorithm , which is described in this paper .