Circumstellar Environments of the Nearest Stars

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The Sun's nearest neighbors are predominantly cool, low-mass dwarf stars. These objects are likely to harbor circumstellar disks or substellar companions that have gone undetected in previous searches. Only a dozen of the nearest M dwarfs were bright enough to allow IRAS detections of their photospheres, and only a single one was measured well enough to suggest an infrared excess. The nearest stars offer SIRTF its best opportunity to address two important science goals: (1) Measure the frequency and nature of infrared excess among M dwarfs, the most common stellar type in the galaxy; and (2) Conduct an imaging search for substellar companions as small as ten Jupiter masses at SIRTF’s maximum linear resolution, with minimal required image contrast. The results of this program will provide important supporting information for future planet searches in the solar neighborhood. This program explicitly includes all stars within 5 pc of the Sun which are not targeted in other MIPS GTO programs, a total of 45 targets. All are M dwarfs, with the exceptions of alpha Cen, Sirius, and Altair. Similar programs are planned for these targets by the IRAC and IRS teams, and will be coordinated with this effort.

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