a Search for Companions around Stars Within Five Parsecs

Details a Search for Companions around Stars Within Five Parsecs a Search for Companions around Stars Within Five Parsecs

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop...33f&link_type=abstract

Spitzer Proposal ID #33

Computer Science

Scientific paper

Each star known within 5 parsecs of the Sun will be observed with IRAC to discover very low mass companions. Simply because of their proximity, these targets promise to provide one of the most sensitive experiments possible with IRAC --- the detection of super-Jupiters around the nearest stars. Depending on distance and separation from the stars, companions with masses as low as 5-20 Mjup can be detected. The sample of 60 stars in 44 systems within 5 parsecs requires 45 IRAC pointings (Proxima Cen requires its own pointing because it is two degrees from alpha Cen). The sample includes 4 white dwarfs, 1 A star (Sirius), 1 F star (Procyon), 2 G stars (alpha Cen A and tau Ceti), 6 K stars, and 46 M stars. These stars comprise 30 single systems, 10 doubles, and 3 triples, as well as the nearest star with a probable extrasolar planet, Gl 876.

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