112 citations · 283 across the 12 of their papers we have counts for
12 papers
Searching for Massive Remnant Planetary System Hosts with White Dwarf Gaia XP Spectra
Lou Baya Ould Rouis, J. J. Hermes, Pierre Bergeron +5
Remnant planetary systems around massive white dwarfs () are intrinsically rare and remain poorly characterized. As the evolutionary endpoints of i…
Now you see me, now you don't: Deep, long-lived obscuration events of white dwarfs by dust and debris from disintegrating planetesimals
J. van Roestel, S. Bhattacharjee, J. A. Guidry +22
Transiting dust and debris around white dwarfs provide a direct view of planetary disruption. We report six previously non-variable white dwarfs that underwent single, deep obscura…
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…
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…
A ZTF Search for Circumstellar Debris Transits in White Dwarfs: Six New Candidates, one with Gas Disk Emission, identified in a Novel Metric Space
Soumyadeep Bhattacharjee, Zachary P. Vanderbosch, Mark A. Hollands +13
White dwarfs (WDs) showing transits from orbiting planetary debris provide significant insights into the structure and dynamics of debris disks. This is a rare class of objects wit…
Sporadic Dips from Extended Debris Transiting the Metal-Rich White Dwarf SBSS 1232+563
J. J. Hermes, Joseph A. Guidry, Zachary P. Vanderbosch +5
We present the discovery of deep but sporadic transits in the flux of SBSS 1232+563, a metal-rich white dwarf polluted by disrupted exoplanetary debris. Nearly 25 years of photomet…
Using 3.4-m Variability towards White Dwarfs as a Signpost of Remnant Planetary Systems
Joseph A. Guidry, J. J. Hermes, Kishalay De +3
Roughly 2% of white dwarfs harbor planetary debris disks detectable via infrared excesses, but only a few percent of these disks show a gaseous component, distinguished by their do…
Measuring White Dwarf Variability from Sparsely Sampled Gaia DR3 Multi-Epoch Photometry
Maya Steen, J. J. Hermes, Joseph A. Guidry +5
White dwarf stars are ubiquitous in the Galaxy, and are essential to understanding stellar evolution. While most white dwarfs are photometrically stable and reliable flux standards…
Relentless and Complex Transits from a Planetesimal Debris Disk
J. Farihi, J. J. Hermes, T. R. Marsh +11
This article reports quasi-continuous transiting events towards WD 1054-226 at d=36.2 pc and V=16.0 mag, based on simultaneous, high-cadence, multi-wavelength imaging photometry us…
Recurring Planetary Debris Transits and Circumstellar Gas around White Dwarf ZTF J03281219
Zachary P. Vanderbosch, Saul Rappaport, Joseph A. Guidry +14
We present follow-up photometry and spectroscopy of ZTF J03281219 strengthening its status as a white dwarf exhibiting transiting planetary debris. Using TESS and Zwicky Transie…
Year 1 of the ZTF high-cadence Galactic Plane Survey: Strategy, goals, and early results on new single-mode hot subdwarf B-star pulsators
Thomas Kupfer, Thomas A. Prince, Jan van Roestel +18
We present the goals, strategy and first results of the high-cadence Galactic plane survey using the Zwicky Transient Facility (ZTF). The goal of the survey is to unveil the Galact…
I Spy Transits and Pulsations: Empirical Variability in White Dwarfs Using Gaia and the Zwicky Transient Facility
Joseph A. Guidry, Zachary P. Vanderbosch, J. J. Hermes +13
We present a novel method to detect variable astrophysical objects and transient phenomena using anomalous excess scatter in repeated measurements from public catalogs of Gaia DR2…