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Coalescences of binary white dwarfs represent a copious source of informationfor gravitational wave interferometers operating in the decihertz band.Moreover, according to the double degenerate scenario, they have been suggestedto be possible progenitors of supernovae (SNe) Type Ia events. In this paper wediscuss the detectability of gravitational waves emitted by the inspiral ofdouble white dwarfs. We focus on the constraints that can be derived on thesource's luminosity distance, and on other binary's parameters, such as theangular momentum orientation. We explore the possibility of coincidentdetections of gravitational and electromagnetic signals; the latter comes fromthe observation of the supernova counterpart. Confirmation of the doubledegenerate scenario would allow one to use distances inferred in thegravitational wave channel to consistently calibrate SNe as standard candles.We find that decihertz gravitational wave interferometers can measure theluminosity distance with relative accuracy better than $1\%$ for binaries at100 Mpc. We show how multimessenger observations can put strong constraints onthe Hubble constant, which are tighter than current bounds at low redshift, andhow they can potentially shed new light on the differences with early-universemeasurements.

Binary white dwarfs and decihertz gravitational wave observations: From the Hubble constant to supernova astrophysics