A5002451231- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- History and Developments in Astronomy
- Astronomical Observations and Instrumentation
- Superconducting Materials and Applications
- Educational Leadership and Practices
- Geophysics and Gravity Measurements
Boston University
2021-2024
The University of Texas at Austin
2021
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 Zwicky Transient Facility (ZTF) DR3 photometry. first provide generalized, all-sky proxy for variability only photometry, calibrated white dwarf stars. To ensure more robust candidate detection, we further employ combining with ZTF photometry alerts. demonstrate the efficacy, apply this latter technique sample...
We present follow-up photometry and spectroscopy of ZTF J0328$-$1219 strengthening its status as a white dwarf exhibiting transiting planetary debris. Using TESS Zwicky Transient Facility photometry, along with high speed from various observatories, we find evidence for two significant periods variability at 9.937 11.2 hr. interpret these most likely the orbital different debris clumps. Changes in detailed dip structures within light curves are observed on nightly, weekly, monthly...
ABSTRACT We present the goals, strategy, and first results of high-cadence Galactic plane survey using Zwicky Transient Facility (ZTF). The goal is to unveil population short-period variable stars, including binaries, stellar pulsators with periods less than a few hours. Between 2018 June 2019 January, we observed 64 ZTF fields resulting in 2990 deg2 high density ZTF-r band along plane. Each field was continuously for 1.5 6 h cadence 40 sec. Most have between 200 400 observations obtained...
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 using ULTRACAM over 18 nights from 2019 to 2020 March. The predominant period is 25.02 h, corresponds a circular orbit with blackbody Teq = 323 K, where planetary surface can nominally support liquid water. light curves reveal remarkable night-to-night similarity, changes longer timescales, lack any transit-free...
White dwarfs (WDs) showing transits from orbiting planetary debris provide significant insights into the structure and dynamics of disks. This is a rare class objects with only eight published systems. In this work, we perform systematic search for such systems within 500 pc in Gaia-eDR3 catalog WDs using light curves Zwicky Transient Facility (ZTF) present six new candidates. Our selection process targets top 1% most photometrically variable sources identified combined variability metric...
White dwarf stars are ubiquitous in the Galaxy, and essential to understanding stellar evolution. While most white dwarfs photometrically stable reliable flux standards, some can be highly variable, which reveal unique details about endpoints of low-mass In this study we characterize a sample high-confidence with multi-epoch photometry from Gaia Data Release 3. We compare these light curves Zwicky Transiting Facility Exoplanet Survey Satellite see when data independently accurately measure...
Abstract White dwarf stars are ubiquitous in the Galaxy, and essential to understanding stellar evolution. While most white dwarfs photometrically stable reliable flux standards, some can be highly variable, which reveal unique details about endpoints of low-mass In this study, we characterize a sample high-confidence with multi-epoch photometry from Gaia Data Release 3. We compare these light curves Zwicky Transiting Facility Exoplanet Survey Satellite see when data independently accurately...
We present the discovery of deep but sporadic transits in flux SBSS 1232+563, a metal-rich white dwarf polluted by disrupted exoplanetary debris. Nearly 25 years photometry from multiple sky surveys reveal evidence occasional dimming dwarf, most notably evident an 8-months-long event 2023 that caused >40% drop star. In-transit follow-up shows additional short-timescale (minutes- to hours-long) events. TESS suggests coherent 14.842-hr signal could represent dominant orbital period Six...
Abstract We present the discovery of deep but sporadic transits in flux SBSS 1232+563, a metal-rich white dwarf polluted by disrupted exoplanetary debris. Nearly 25 yr photometry from multiple sky surveys reveal evidence occasional dimming dwarf, most notably evident an 8 month long event 2023 that caused >40% drop star. In-transit follow-up shows additional short-timescale (minutes- to hours-long) events. Transiting Exoplanet Survey Satellite suggests coherent 14.842 hr signal could...
Abstract Roughly 2% of white dwarfs harbor planetary debris disks detectable via infrared excesses, but only a few percent these show gaseous component, distinguished by their double-peaked emission at the near-infrared calcium triplet. Previous studies found that most around are variable 3.4 and 4.5 μ m, they analyzed now 21 published showing emission. To test if exhibit large-amplitude stochastic variability in near-infrared, we use light curves generated from unWISE images m corrected for...
Roughly 2% of white dwarfs harbor planetary debris disks detectable via infrared excesses, but only a few percent these show gaseous component, distinguished by their double-peaked emission at the near-infrared calcium triplet. Previous studies found most around are variable 3.4 and 4.5 $\mu$m, they analyzed now 21 published showing emission. To test if exhibit large-amplitude stochastic variability in near-infrared, we use light curves generated from unWISE images $\mu$m that corrected for...