Astrometric gravitational-wave detection via stellar interferometry
نویسندگان
چکیده
We evaluate the potential for gravitational-wave (GW) detection in frequency band from 10 nHz to $1\text{ }\text{ }\ensuremath{\mu}\mathrm{Hz}$ using extremely high-precision astrometry of a small number stars. In particular, we argue that nonmagnetic, photometrically stable, hot white dwarfs (WD) located at $\ensuremath{\sim}\mathrm{kpc}$ distances may be optimal targets this approach. Previous studies astrometric GW have focused on less precise surveys large numbers stars; our work provides an alternative optimization approach problem. Interesting sources are expected characteristic strains around ${h}_{c}\ensuremath{\sim}{10}^{\ensuremath{-}17}\ifmmode\times\else\texttimes\fi{}(\ensuremath{\mu}\mathrm{Hz}/{f}_{\mathrm{GW}})$. The angular precision required see these is $\mathrm{\ensuremath{\Delta}}\ensuremath{\theta}\ensuremath{\sim}{h}_{c}$ after integrating time $T\ensuremath{\sim}1/{f}_{\mathrm{GW}}$. show jitter photometric center WD type due starspots bounded enough permit high-precision, small-$N$ discuss possible noise arising stellar reflex motion induced by orbiting objects and how it can mitigated. only plausible technology able achieve requisite space-based interferometer. Such future mission with few-meter-scale collecting dishes baselines $\mathcal{O}(100\text{ }\mathrm{km})$ sufficient target precision. This collector size broadly line collectors proposed some formation-flown, astrometer or optical synthetic-aperture imaging-array concepts other science reasons. baseline however somewhat larger than km-scale discussed those concepts, but no fundamental technical obstacle utilizing such baselines. A thus also holds promise being one few ways access interesting band.
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ژورنال
عنوان ژورنال: Physical review
سال: 2022
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevd.106.023002