We have obtained near-IR photometry for the 11 Praesepe white dwarfs, to search for an excess indicative of a dusty debris disk. All the white dwarfs are in the DAZ temperature regime, however we find no indications of a disk around any white dwarf. We have, however determined that the radial velocity variable white dwarf WD0837+185 could have an unresolved T8 dwarf companion that would not be seen as a near-IR excess.
@article{arxiv.1012.1143,
title = {Evolved solar systems in Praesepe},
author = {S. L. Casewell and M. R. Burleigh and P. D. Dobbie and R. Napiwotzki},
journal= {arXiv preprint arXiv:1012.1143},
year = {2015}
}
Comments
4 pages, 1 table, 2 figures. Part of PlanetsbeyondMS/2010 proceedings http://arxiv.org/html/1011.6606v1