ar X iv : a st ro - p h / 03 05 19 5 v 1 1 2 M ay 2 00 3 The First Detailed Look at a Brown Dwarf Disk

ar X iv : a st ro - p h / 05 07 63 5 v 1 2 7 Ju l 2 00 5 MID - INFRARED OBSERVATIONS OF THE WHITE DWARF BROWN DWARF BINARY GD 1400

Fluxes are measured for the DA white dwarf plus brown dwarf pair GD 1400 with the Infrared Array Camera on the Spitzer Space Telescope. GD 1400 displays an infrared excess over the entire 3 − 8µm region consistent with the presence of a mid-to late-type L dwarf companion. A discussion is given regarding current knowledge of this unique system.

ar X iv : a st ro - p h / 05 05 55 5 v 1 2 7 M ay 2 00 5 Pulsars as Tools for Fundamental Physics & Astrophysics

X iv :a st ro -p h/ 05 05 55 5v 1 2 7 M ay 2 00 5 Pulsars as Tools for Fundamental Physics & Astrophysics J. M. Cordes, M. Kramer, T. J. W. Lazio , B. W. Stappers, D. C. Backer, S. Johnston Department of Astronomy and NAIC, Cornell University, Ithaca, NY USA University of Manchester, Jodrell Bank Observatory, Jodrell Bank, UK Naval Research Laboratory, Remote Sensing Division, Washington, DC US...

ar X iv : a st ro - p h / 03 05 46 5 v 1 2 3 M ay 2 00 3 Sunyaev - Zel ’ dovich cluster surveys using a large beam

Sunyaev Zel’dovich cluster surveys can be used to constrain cosmological parameters. Extracting clusters from the primary anisotropies and the unresolved background from very faint clusters is simple when the telescope beam size is small (∼ 1′), but could be difficult if the beam is larger (∼ 8′). By reference to examples, we show that this is possible by carefully designing the depth of the su...

ar X iv : a st ro - p h / 03 05 13 2 v 1 8 M ay 2 00 3 The Origin of Soft X - rays in DQ Herculis

DQ Herculis (Nova Herculis 1934) is a deeply eclipsing cataclysmic variable containing a magnetic white dwarf primary. The accretion disk is thought to block our line of sight to the white dwarf at all orbital phases due to its extreme inclination angle. Nevertheless, soft X-rays were detected from DQ Her with ROSAT PSPC. To probe the origin of these soft X-rays, we have performed Chandra ACIS ...

ar X iv : a st ro - p h / 06 05 06 7 v 1 2 M ay 2 00 6 Sensitivity and pointing accuracy of the NEMO km 3 telescope