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arXiv · 2601.14578

Higher Harmonics of Double White Dwarfs in the Centihertz Band: Linking LISA and DECIGO

Naoki Seto
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Abstract

We investigate the detectability of post-Newtonian higher harmonics from Galactic double white dwarfs in the centihertz band ($\sim 0.01$ Hz). Using a synthetic population, we show that, unlike the quadrupole mode, higher harmonics remain undetectable with LISA except for rare nearby systems. In contrast, planned mid-band (decihertz) observatories such as DECIGO and BBO will be able to detect the third harmonic for about 10\% of inspiral binaries above $\sim 5$ mHz, enabling statistical constraints on mass ratios. These results highlight the successive roles of LISA and future decihertz missions in establishing a coherent strategy for space-based gravitational-wave astronomy.

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Naoki Seto. 2026-01-21. Higher Harmonics of Double White Dwarfs in the Centihertz Band: Linking LISA and DECIGO. https://arxiv.org/abs/2601.14578

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