White Dwarfs In The UKIRT Infrared Deep Sky Survey Data Release 9
P.-E. Tremblay, S. K. Leggett, N. Lodieu, B. Freytag, P. Bergeron, J., S. Kalirai, and H.-G. Ludwig

TL;DR
This study identifies and characterizes new cool white dwarfs from UKIDSS DR9, providing insights into their atmospheres, ages, and kinematics, and comparing them with previous samples to understand spectral evolution.
Contribution
It presents new cool white dwarf discoveries from UKIDSS DR9, confirms their nature spectroscopically, and analyzes their properties using advanced models, enhancing understanding of white dwarf evolution.
Findings
Most new white dwarfs have temperatures below 5000 K.
Two hydrogen-rich remnants are 8.5-9.0 Gyr old.
A double degenerate system with 3-5 Gyr cooling age.
Abstract
We have identified eight to ten new cool white dwarfs from the Large Area Survey (LAS) Data Release 9 of the United Kingdom InfraRed Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS). The data set was paired with the Sloan Digital Sky Survey (SDSS) to obtain proper motions and a broad ugrizYJHK wavelength coverage. Optical spectroscopic observations were secured at Gemini Observatory and confirm the degenerate status for eight of our targets. The final sample includes two additional white dwarf candidates with no spectroscopic observations. We rely on improved 1D model atmospheres and new multi-dimensional simulations with CO5BOLD to review the stellar parameters of the published LAS white dwarf sample along with our additional discoveries. Most of the new objects possess very cool atmospheres with effective temperatures below 5000 K, including two pure-hydrogen remnants with a…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Adaptive optics and wavefront sensing
