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<p>Lunar-based gravitational-wave interferometry is a fascinating endeavor, and was proposed as a promising approach to bridge the observational gap between space- and ground-based detectors. In this work, we adopt the Fisher-matrix method to examine the angular-resolution performance of the newly proposed Crater Interferometry Gravitational-wave Observatory (CIGO) on the lunar crater rim near the north pole, together with TianQin and LISA, for monochromatic sources in the 0.1-10Hz band. We find that above 2.87 Hz, CIGO achieves better localization accuracy than the other two space-based missions and dominates the combined detector network’s performance. We further explore an upgraded Tetrahedron configuration, TCIGO, with a fourth station at the bottom of a crater, which forms a regular tetrahedral constellation on the lunar surface. The result shows that TCIGO yields a five-fold improvement in angular-resolution capability over CIGO and gets better sky coverage across the target frequency band.</p>

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The new generation lunar gravitational wave detectors: sky map resolution and joint analysis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月4日

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  • Xiaolin Zhang,
  • Chengye Yu,
  • Haoran Li,
  • Sobhan Kazempour,
  • Mingqiu Li,
  • Sichun Sun

摘要

Lunar-based gravitational-wave interferometry is a fascinating endeavor, and was proposed as a promising approach to bridge the observational gap between space- and ground-based detectors. In this work, we adopt the Fisher-matrix method to examine the angular-resolution performance of the newly proposed Crater Interferometry Gravitational-wave Observatory (CIGO) on the lunar crater rim near the north pole, together with TianQin and LISA, for monochromatic sources in the 0.1-10Hz band. We find that above 2.87 Hz, CIGO achieves better localization accuracy than the other two space-based missions and dominates the combined detector network’s performance. We further explore an upgraded Tetrahedron configuration, TCIGO, with a fourth station at the bottom of a crater, which forms a regular tetrahedral constellation on the lunar surface. The result shows that TCIGO yields a five-fold improvement in angular-resolution capability over CIGO and gets better sky coverage across the target frequency band.