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

Abstract

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 luminosity, only about 25 identified CWDBs are detectable by the Laser Interferometer Space Antenna (LISA), which are also known as verification binaries (VBs). The Gaia Early Data Release 3 (EDR3) provids a catalog containing a large number of CWDB candidates, which also includes parallax and photometry measurements. We crossmatch the Gaia EDR3 and Zwicky Transient Facility public data release 8, and apply period-finding algorithms to obtain a sample of periodic variables. The phase-folded light curves are inspected, and finally we obtain a binary sample containing 429 CWDB candidates. We further classify the samples into eclipsing binaries (including 58 HW Vir-type binaries, 65 EA-type binaries, 56 EB-type binaries, and 41 EW-type binaries) and ellipsoidal variations (209 ELL-type binaries). We discovered four ultrashort period binary candidates with unique light-curve shapes. We estimate the GW amplitude of all of our binary candidates, and calculate the corresponding signal-to-noise ratio (S/N) for TianQin and LISA. We find two (six) potential GW candidates with S/Ns greater than 5 in the nominal mission time of TianQin (LISA), which increases the total number of candidate VBs for TianQin (LISA) to 18 (31).

40 pages, 20 figures

References in corpus (51)

• Array Programming with NumPy
• The NumPy array: a structure for efficient numerical computation
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• Laser Interferometer Space Antenna
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• The Zwicky Transient Facility: Science Objectives
• The Evolution of Compact Binary Star Systems
• A million binaries from Gaia eDR3: sample selection and validation of Gaia parallax uncertainties
• Concepts and status of Chinese space gravitational wave detection projects
• A catalogue of white dwarfs in Gaia EDR3
• The Zwicky Transient Facility: Observing System
• The ELM Survey. I. A Complete Sample of Extremely Low Mass White Dwarfs
• Science with the TianQin Observatory: Preliminary results on Galactic double white dwarf binaries
• The ELM Survey. VIII. 98 Double White Dwarf Binaries
• Evolution of Cataclysmic Variables and Related Binaries Containing a White-Dwarf
• Evolution of Close White Dwarf Binaries
• Gaia Data Release 2 Catalogue of Extremely-low Mass White Dwarf Candidates
• One thousand cataclysmic variables from the Catalina Real-time Transient Survey
• A hot subdwarf-white dwarf super-Chandrasekhar candidate supernova Ia progenitor
• White dwarf-main sequence binaries from Gaia EDR3: the unresolved 100pc volume-limited sample
• Orbital Decay in a 20 Minute Orbital Period Detached Binary with a Hydrogen Poor Low Mass White Dwarf
• A Catalogue of Potential Post Common Envelope Binaries
• A New Gravitational Wave Verification Source
• A new class of Roche lobe-filling hot subdwarf binaries
• The Clouds are breaking: tracing the Magellanic system with Gaia DR1 Mira variables
• Discovery and characterization of five new eclipsing AM CVn systems
• A new class of pulsating hot subdwarfs
• The White Dwarf Binary Pathways Survey IV: Three close white dwarf binaries with G-type secondary stars
• The white dwarf binary pathways survey - II. Radial velocities of 1453 FGK stars with white dwarf companions from LAMOST DR4
• The ELM Survey. IX. A Complete Sample of Low Mass White Dwarf Binaries in the SDSS Footprint
• Hot subdwarf stars identified in Gaia DR2 with spectra of LAMOST DR6 and DR7 I. Single-lined spectra
• The ELM Survey South. I. An Effective Search for Extremely Low Mass White Dwarfs
• The White Dwarf Binary Pathways Survey VI: two close post common envelope binaries with TESS light curves
• A population synthesis fitting of the $Gaia$ resolved white dwarf binary population within 100 pc
• Spectroscopic and Photometric Periods of Six Ultracompact Accreting Binaries
• The formation of single neutron-stars from double white-dwarf mergers via accretion-induced collapse
• Formation of millisecond pulsars with long orbital periods by accretion-induced collapse of white-dwarfs
• Extremely low-mass white dwarf stars observed in Gaia DR2 and LAMOST DR8
• New Variable Hot Subdwarf Stars Identified from Anomalous Gaia Flux Errors, Observed by TESS, and Classified via Fourier Diagnostics
• Evidence that short period AM CVn systems are diverse in outburst behaviour
• Discovery of a high state AM CVn binary in the Galactic Bulge Survey
• Identifying Blue Large Amplitude Pulsators from Gaia DR2 & ZTF DR3
• TACOS: TESS AM~CVn Outbursts Survey
• The White Dwarf Binary Pathways Survey VII: Evidence for a bi-modal distribution of post mass transfer systems?
• A dense $0.1{\mathbf{M}}_{\odot }$ star in a 51-minute orbital period eclipsing binary
• A Roche Lobe-filling hot Subdwarf and White Dwarf Binary: possible detection of an ejected common envelope
• The Discovery of Two LISA Sources within 0.5 kpc
• Four new deeply-eclipsing white dwarfs in ZTF
• Photometric variability of candidate white dwarf binary systems from Palomar Transient Factory archival data
• fBLS -- a fast-folding BLS algorithm
• Searching for cataclysmic variable stars in unidentified X-ray sources