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Pressure Distortion of the H-He Collision-Induced Absorption at the Photosphere of Cool White Dwarf Stars
Simon Blouin, Piotr M. Kowalski, Patrick Dufour
Collision-induced absorption (CIA) from molecular hydrogen is a dominant opacity source in the atmosphere of cool white dwarfs. It results in a significant flux depletion in the ne…
Infrared Opacities in Dense Atmospheres of Cool White Dwarf Stars
Piotr M. Kowalski, Simon Blouin, Patrick Dufour
Dense, He-rich atmospheres of cool white dwarfs represent a challenge to the modeling. This is because these atmospheres are constituted of a dense fluid in which strong multi-atom…
A New Generation of Cool White Dwarf Atmosphere Models Using Ab Initio Calculations
Simon Blouin, Patrick Dufour, Piotr M. Kowalski
Due to their high photospheric density, cool helium-rich white dwarfs (particularly DZ, DQpec and ultracool) are often poorly described by current atmosphere models. As part of our…
Infrared absorption of dense helium and its importance in the atmospheres of cool white dwarfs
Piotr M. Kowalski
Aims: Hydrogen deficient white dwarfs are characterized by very dense, fluid-like atmospheres of complex physics and chemistry that are still poorly understood. The incomplete desc…
Towards an Understanding of the Atmospheres of Cool White Dwarfs
Piotr M. Kowalski, Didier Saumon, Jay Holberg +1
Cool white dwarfs with Teff < 6000 K are the remnants of the oldest stars that existed in our Galaxy. Their atmospheres, when properly characterized, can provide valuable informati…
The habitability and detection of Earth-like planets orbiting cool white dwarfs
L. Fossati, S. Bagnulo, C. A. Haswell +5
Since there are several ways planets can survive the giant phase of the host star, we examine the habitability and detection of planets orbiting white dwarfs. As a white dwarf cool…