Understanding the Population of Distant Ultracool-Dwarfs from WISPS and 3d-HST

Project: Research project

Project Details


II. Program Summary This Program is designed to identify ultracool dwarf stars in the disk of the Milky Way from pure-parallel and primary grism spectroscopy from HST/WFC3. The data are part of the 3d-HST Legacy program (PI: P. van Dokkum) and the on-going WISPS survey (PI: M. Malkan), in fact WISPS has been approved cycles 17{21. We can readily identify and type ultracool dwarfs by their strong water absorption at 1:4m, which robustly maps to eective temperature. Based on previous work, we expect to identify 100 L-type and 50 T-type ultracool dwarfs, with which we will 1 explore three primary science topics: (1) estimate their vertical distribution in the Milky Way as a function of eective temperature, (2) characterize their atmospheres with standard brown dwarf models | estimating properties such as metalicity, surface gravity, and cloud sedimentation, and (3) systematically search for the rare Y-type dwarfs (at present, only 20 are known to exist and no clear prototype has yet to emerge). Our Program leverages&1500 orbits of archived HST data, which will increase to2000 with the approval of WISPS in Cycle 21.
Effective start/end date10/1/139/30/16


  • National Aeronautics Space Administration (NASA): $11,676.00

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