I Spy Transits and Pulsations: Empirical Variability in White Dwarfs Using Gaia and the Zwicky Transient Facility

  title={I Spy Transits and Pulsations: Empirical Variability in White Dwarfs Using Gaia and the Zwicky Transient Facility},
  author={Joseph A. Guidry and Zach Vanderbosch and J. J. Hermes and Brad N. Barlow and Isaac D. Lopez and Thomas M. Boudreaux and Kyle A. Corcoran and Keaton J. Bell and Michael H. Montgomery and Tyler M. Heintz and B{\'a}rbara Garcia Castanheira and Joshua S. Reding and Bart H. Dunlap and Don E. Winget and Karen I. Winget and John William Kuehne},
  journal={The Astrophysical Journal},
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 and Zwicky Transient Facility (ZTF) DR3 photometry. We first provide a generalized, all-sky proxy for variability using only Gaia DR2 photometry, calibrated to white dwarf stars. To ensure more robust candidate detection, we further employ a method combining Gaia with ZTF photometry and alerts. To demonstrate its… 

Recurring Planetary Debris Transits and Circumstellar Gas around White Dwarf ZTF J0328–1219

We present follow-up photometry and spectroscopy of ZTF J0328−1219, strengthening its status as a white dwarf exhibiting transiting planetary debris. Using TESS and Zwicky Transient Facility

Discovery, TESS Characterization, and Modeling of Pulsations in the Extremely Low-mass White Dwarf GD 278

We report the discovery of pulsations in the extremely low-mass (ELM), likely helium-core white dwarf GD 278 via ground- and space-based photometry. GD 278 was observed by the Transiting Exoplanet

A Systematic Search for Short-period Close White Dwarf Binary Candidates Based on Gaia EDR3 Catalog and Zwicky Transient Facility Data

Galactic short-period close white dwarf binaries (CWDBs) are important objects for space-borne gravitational-wave (GW) detectors in the millihertz frequency bands. Due to the intrinsically low

Searching for TESS Photometric Variability of Possible JWST Spectrophotometric Standard Stars

We use data from the Transiting Exoplanet Survey Satellite (TESS) to search for, and set limits on, optical to near-infrared photometric variability of the well-vetted, candidate James Webb Space

The Pulsating Helium-atmosphere White Dwarfs. I. New DBVs from the Sloan Digital Sky Survey

We present a dedicated search for new pulsating helium-atmosphere (DBV) white dwarfs from the Sloan Digital Sky Survey using the McDonald 2.1 m Otto Struve Telescope. In total we observed 55 DB and

On the Unusual Variability of 2MASS J06195260–2903592: A Long-lived Disk around a Young Ultracool Dwarf

We present the characterization of the low-gravity M6 dwarf 2MASS J06195260-2903592, previously identified as an unusual field object based on its strong IR excess and variable near-IR spectrum.

Eclipsing Binaries Found by the EREBOS Project: Gaia DR2 6097540197980557440—a Deeply Eclipsing sdB+dM System

We present time-series spectroscopy and photometry of Gaia DR2 6097540197980557440, a new deeply eclipsing hot subdwarf B (sdB) + M dwarf (dM) binary. We discovered this object during the course of

Astrometric Gravitational-Wave Detection via Stellar Interferometry

We evaluate the potential for gravitational-wave (GW) detection in the frequency band from 10 nHz to 1 µ Hz using extremely high-precision astrometry of a small number of stars. In particular, we

The Geometry of the G29-38 White Dwarf Dust Disk from Radiative Transfer Modeling

Many white dwarfs host disks of dust produced by disintegrating planetesimals and revealed by infrared excesses. The disk around G29-38 was the first to be discovered and is now well-observed, yet we

The Rapid Rotation of the Strongly Magnetic Ultramassive White Dwarf EGGR 156

The distribution of white dwarf rotation periods provides a means for constraining angular momentum evolution during the late stages of stellar evolution, as well as insight into the physics and



The ZTF Source Classification Project – II. Periodicity and variability processing metrics

This paper presents the codebase, ztfperiodic, and the computational metrics employed for the catalogue based on ZTF's Second Data Release, and describes the publicly available, graphical-process-unit optimized period-finding algorithms employed, and highlights the benefit of existing and future graphical- process-unit clusters.

The Pan-STARRS1 Surveys

Pan-STARRS1 has carried out a set of distinct synoptic imaging sky surveys including the $3\pi$ Steradian Survey and the Medium Deep Survey in 5 bands ($grizy_{P1}$). The mean 5$\sigma$ point source

Ground-based and Airborne Instrumentation for Astronomy III

Cosponsored by 4D Technology (United States) • Andor Technology, Ltd. (United Kingdom) • Astronomical Consultants & Equipment, Inc. (United States) • Giant Magellan Telescope (Chile) • GPixel, Inc.

Gaia DR2 catalog. †—Observed in SDSS g-band. ‡—The weighted mean period of pulsations is only relevant to pulsating white dwarfs

  • 2019

2018, A Method

  • 2018

NOTE—Description of columns: all of the object names and stellar parameters are directly sourced

  • 2019

A Method to Select Variable White Dwarfs from Gaia DR2, 21st European White Dwarf Workshop, Zenodo, doi: 10.5281/zenodo.4088554

  • 2018

A Method to Select Variable White Dwarfs from Gaia DR2

  • Zenodo
  • 2018

Stars and their variability observed from space

Solar-like oscillations in red-giant stars are now commonly detected in thousands of stars with space telescopes such as the NASA Kepler mission. Parallel radial velocity and photometric measurements

Table 6, (continued)