124 citations · 600 across the 13 of their papers we have counts for
13 papers
A Targeted Search for Peculiarly Red L and T Dwarfs in SDSS, 2MASS, and WISE: Discovery of a Possible L7 Member of the TW Hydrae Association
Kendra Kellogg, Stanimir Metchev, Kerstin Geissler +3
We present first results from a targeted search for brown dwarfs with unusual red colors indicative of peculiar atmospheric characteristics. These include objects with low surface…
Stellar companions to exoplanet host stars: Lucky Imaging of transiting planet hosts
Carolina Bergfors, Wolfgang Brandner, Sebastian Daemgen +7
Observed properties of stars and planets in binary/multiple star systems provide clues to planet formation and evolution. We extended our survey for visual stellar companions to th…
A Substellar Common Proper Motion Companion to the Pleiad HII 1348
Kerstin Geißler, Stanimir A. Metchev, Alfonse Pham +3
We announce the identification of a proper motion companion to the star HII 1348, a K5V member of the Pleiades open cluster. The existence of a faint point source 1.1arcsec away fr…
VLT/NACO Polarimetric Differential Imaging of HD100546 - Disk Structure and Dust Grain Properties between 10-140 AU
Sascha P. Quanz, Hans Martin Schmid, Kerstin Geissler +4
We present polarimetric differential imaging (PDI) data of the circumstellar disk around the Herbig Ae/Be star HD100546 obtained with VLT/NACO. We resolve the disk in polarized lig…
A Cross-Match of 2MASS and SDSS. II. Peculiar L Dwarfs, Unresolved Binaries, and the Space Density of T Dwarf Secondaries
Kerstin Geißler, Stanimir Metchev, J. Davy Kirkpatrick +2
We present the completion of a program to cross-correlate the SDSS Data Release 1 and 2MASS Point Source Catalog in search for extremely red L and T dwarfs. The program was initiat…
Resolving the L/T transition binary SDSS J2052-1609 AB
M. B. Stumpf, K. Geißler, H. Bouy +3
Binaries provide empirical key constraints for star formation theories, like the overall binary fraction, mass ratio distribution and the separation distribution. They play a cruci…