Searching for continuous gravitational waves from highly deformed compact objects with DECIGO

Abstract

Searches for continuous gravitational waves from isolated compact objects and those in binary systems aim to detect non-axisymmetric, deformed neutron stars at particular locations in the Galaxy or all-sky. However, a large fraction of known pulsars have rotational frequencies that lie outside the audio frequency band, rendering current detectors insensitive to these pulsars. In this work, we show that DECIGO, a future space-based deci-hertz gravitational-wave interferometer, will be sensitive to severely deformed compact objects, e.g. hybrid stars, neutron stars, or magnetars. We estimate the number of possible compact objects that could be detected with such high deformations, both via their individual continuous gravitational-wave emission and the stochastic gravitational-wave background created by a superposition of gravitational waves from the $\sim 10^8$ compact objects in the Galaxy. Furthermore, we show that the existence of such compact objects could be probed across a wide parameter space at a fraction of the computational cost of current searches for isolated compact objects and those in binary systems. For known pulsars, we will be able to both beat the spin-down limit and probe the Brans-Dicke modified theory of gravity parameter $\zeta <1$ for approximately 85% of known pulsars with $f_{\mathrm{gw}}<10$ Hz, the latter of which is currently only possible for $O(10)$ pulsars. DECIGO will thus open a new window to probe highly deformed compact objects and over half of the known pulsars, both of which are currently inaccessible to ground-based detectors.

12 pages, 9 figures, comments are welcome! Published in PRD

References in corpus (66)

• Planck 2015 results. XIII. Cosmological parameters
• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• Advanced LIGO
• The ATNF Pulsar Catalogue
• Interferometer design of the KAGRA gravitational wave detector
• Cosmological Backgrounds of Gravitational Waves
• A geometric distance measurement to the Galactic Center black hole with 0.3% uncertainty
• Sensitivity curves for searches for gravitational-wave backgrounds
• Detector configuration of DECIGO/BBO and identification of cosmological neutron-star binaries
• Detection methods for stochastic gravitational-wave backgrounds: a unified treatment
• Deformations of Accreting Neutron Star Crusts and Gravitational Wave Emission
• The Breaking Strain of Neutron Star Crust and Gravitational Waves
• The astrophysical gravitational wave stochastic background
• Maximum elastic deformations of compact stars with exotic equations of state
• Detecting gravitational wave emission from the known accreting neutron stars
• BBO and the Neutron-Star-Binary Subtraction Problem
• Maximum elastic deformations of relativistic stars
• The Hough transform search for continuous gravitational waves
• Early evolution of newly born magnetars with a strong toroidal field
• Mountains on Neutron Stars: Accreted vs. Non-Accreted crusts
• Gravitational wave emission from a magnetically deformed non-barotropic neutron star
• Searches for Continuous-Wave Gravitational Radiation
• Possible Evidence for Free Precession of a Strongly Magnetized Neutron Star in the Magnetar 4U 0142+61
• Method for all-sky searches of continuous gravitational wave signals using the frequency-Hough transform
• Bayesian estimation of pulsar parameters from gravitational wave data
• Continuous gravitational waves from neutron stars: current status and prospects
• All-sky search for continuous gravitational waves from isolated neutron stars using Advanced LIGO and Advanced Virgo O3 data
• Gravitational-wave constraints on the equatorial ellipticity of millisecond pulsars
• Estimating Stochastic Gravitational Wave Backgrounds with Sagnac Calibration
• Galactic neutron stars I. Space and velocity distributions in the disk and in the halo
• Hidden Markov model tracking of continuous gravitational waves from a neutron star with wandering spin
• The Pulsar Contribution to the Gamma-Ray Background
• Searches for Gravitational Waves from Known Pulsars at Two Harmonics in the Second and Third LIGO-Virgo Observing Runs
• Searches for continuous gravitational waves from neutron stars: A twenty-year retrospective
• Are neutron stars with crystalline colour superconducting cores interesting for the LIGO experiment?
• All-sky search in early O3 LIGO data for continuous gravitational-wave signals from unknown neutron stars in binary systems
• Directed searches for continuous gravitational waves from binary systems: parameter-space metrics and optimal Scorpius X-1 sensitivity
• Search methods for continuous gravitational-wave signals from unknown sources in the advanced-detector era
• Modelling neutron star mountains
• Status and perspectives of Continuous Gravitational Wave searches
• Diving below the spin-down limit: Constraints on gravitational waves from the energetic young pulsar PSR J0537-6910
• Hidden Markov model tracking of continuous gravitational waves from young supernova remnants
• Hidden Markov model tracking of continuous gravitational waves from a binary neutron star with wandering spin. II. Binary orbital phase tracking
• Application of hidden Markov model tracking to the search for long-duration transient gravitational waves from the remnant of the binary neutron star merger GW170817
• Uncovering gravitational-wave backgrounds from noises of unknown shape with LISA
• A method to search for long duration gravitational wave transients from isolated neutron stars using the generalized FrequencyHough
• Deep Einstein@Home all-sky search for continuous gravitational waves in LIGO O3 public data
• Subtraction-noise projection in gravitational-wave detector networks
• Measuring neutron-star ellipticity with measurements of the stochastic gravitational-wave background
• Searching for gravitational waves from known pulsars using the $\mathcal{F}$ and $\mathcal{G}$ statistics
• Prospects of observing continuous gravitational waves from known pulsars
• Neutron Star Crust Can Support A Large Ellipticity
• The Adaptive Transient Hough method for long-duration gravitational wave transients
• SOAP: A generalised application of the Viterbi algorithm to searches for continuous gravitational-wave signals
• Gravitational waves from color-magnetic `mountains' in neutron stars
• New searches for continuous gravitational waves from seven fast pulsars
• BinarySkyHough: a new method to search for continuous gravitational waves from unknown neutron stars in binary systems
• Search strategies for long gravitational-wave transients: hidden Markov model tracking and seedless clustering
• Evolutionary implications of a magnetar interpretation for GLEAM-X J162759.5-523504.3
• Coherent search of continuous gravitational wave signals: extension of the 5-vectors method to a network of detectors
• Stochastic gravitational wave background from magnetic deformation of newly born magnetars
• Stochastic gravitational-wave background searches and constraints on neutron-star ellipticity
• Prospects for Multimessenger Observations of Thorne-Żytkow Objects
• Magnetic equilibria of relativistic axisymmetric stars: The impact of flow constants
• Bayesian $\mathcal{F}$-statistic-based parameter estimation of continuous gravitational waves from known pulsars
• Constraining the abundance of spinning deformed Galactic compact objects with continuous gravitational waves