Towards systematic searches for LISA white dwarf binaries with multiband photometry

Abstract

Ultra-compact double white dwarfs (DWDs) represent key targets for multi-messenger astrophysics, as they may be observed both through gravitational waves and the electromagnetic (EM) spectrum. The future Laser Interferometer Space Antenna (LISA) will detect thousands of these systems, and they are predicted to be the most numerous science targets of the mission. We develop a strategy to identify LISA source candidates in multiband photometric surveys. We constructed a synthetic EM catalogue of white dwarf (WD) detections based on a population synthesis code combined with a semi-analytical model of the Milky Way and a consistent cooling model for the evolution. We compared sources in the LISA band with other WD observations in magnitude-colour and colour-colour plots. From a full sky survey with $u\le$24.5, we find that 57$\%$ of the sources in the LISA band occupy a specific region in colour-colour diagrams. Inside this area, we find that $\sim 63\%$ (6.5 $\times 10^4$) of EM observations are LISA candidates, $\sim 31\%$ ($3.2\times 10^4$) are DWDs slightly outside the LISA frequency range, and only a small contamination comes from single WDs and wider binaries. We find that the colour distributions of close DWDs represent a powerful tool to distinguish potential LISA sources from the broader WD population. This is an avenue to select candidates for further follow-up and identification.

4 pages, 3 figures

References in corpus (24)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
• The Zwicky Transient Facility: Science Objectives
• The gravitational wave signal from the Galactic disk population of binaries containing two compact objects
• A million binaries from Gaia eDR3: sample selection and validation of Gaia parallax uncertainties
• Evolutionary and pulsational properties of white dwarf stars
• Photometric Response Functions of the SDSS Imager
• A catalogue of white dwarfs in Gaia EDR3
• Supernova Type Ia progenitors from merging double white dwarfs: Using a new population synthesis model
• COSMIC Variance in Binary Population Synthesis
• New evolutionary sequences for extremely low mass white dwarfs: Homogeneous mass and age determinations, and asteroseismic prospects
• New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12
• Prospects for detection of detached double white dwarf binaries with Gaia, LSST and LISA
• Predicting the LISA white dwarf binary population in the Milky Way with cosmological simulations
• On the evolution of ultra-massive white dwarfs
• A systematic search of Zwicky Transient Facility data for ultracompact binary LISA-detectable gravitational-wave sources
• The ELM Survey. VIII. 98 Double White Dwarf Binaries
• The physical properties of AM CVn stars: new insights from Gaia DR2
• The effect of ${}^{22}$Ne diffusion in the evolution and pulsational properties of white dwarfs with solar metallicity progenitors
• White dwarf-main sequence binaries from Gaia EDR3: the unresolved 100pc volume-limited sample
• Measuring tides and binary parameters from gravitational wave data and eclipsing timings of detached white dwarf binaries
• Constraining parameters of white-dwarf binaries using gravitational-wave and electromagnetic observations
• The interacting double white dwarf population with LISA; stochastic foreground and resolved sources

Cited by in corpus (1)

• Optical transients from non-explosive double white-dwarf mergers: the case of a central neutron star remnant