3 papers
astro-ph.SR2026
White Dwarf Merger Remnants with Cooling Delays on the Q Branch Lack Strong Magnetism
Lou Baya Ould Rouis, J. J. Hermes, Joseph A. Guidry +8
A population of anomalous ultra-massive white dwarfs discovered with Gaia, often referred to as the Q branch, show high (multi-Gyr) cooling delays produced by exotic physical mecha…
astro-ph.SR2025
Transiting Planetary Debris near the Roche Limit of a White Dwarf on a 4.97hr Orbit -- and its Vanishing
Joseph A. Guidry, Zachary P. Vanderbosch, J. J. Hermes +9
We present the discovery of deep, irregular, periodic transits towards the white dwarf ZTFJ19444557 using follow-up time-series photometry and spectroscopy from Palomar, Kec…
astro-ph.SR2024
Constraints on Remnant Planetary Systems as a Function of Main-Sequence Mass with HST/COS
Lou Baya Ould Rouis, J. J. Hermes, Boris T. Gänsicke +8
As the descendants of stars with masses less than 8 M on the main sequence, white dwarfs provide a unique way to constrain planetary occurrence around intermediate-mass s…