Continuous gravitational-wave signals (CWs) are long-lasting quasi-monochromatic gravitational-wave signals expected to be emitted by rapidly-rotating non-axisymmetric neutron stars. Depending on the rotational frequency and sky location of the source, certain CW signals may behave in a similar manner to narrow-band artifacts present in ground-based interferometric detectors. Part of the detector-characterisation tasks in the current generation of interferometric detectors (Advanced LIGO, Advanced Virgo, and KAGRA) aim at understanding the origin of these narrow artifacts, commonly known as ``spectral lines''. It is expected that similar tasks will continue after the arrival of next-generation detectors (e.g. Einstein Telescope and Cosmic Explorer). Typically, a fraction of the observed lines in a given detector can be associated to one or more instrumental causes; others, however, have an unknown origin. In this work, we assess the similarity of CW signals to spectral lines in order to understand whether a CW may be mistaken for a noise artifact. Albeit astrophysically unlikely, our results do not rule out the possibility of a CW signal being visible in the detector's power spectrum.
Assessing the Impact of Instrumental Requirements on the Scientific Performance of the Einstein Telescope
Marietta Blau Institute - Austrian Academy of Sciences（玛丽亚·布劳研究所-奥地利科学院）；Johns Hopkins University（约翰斯·霍普金斯大学）；Universität Hamburg（汉堡大学）；Università di Napoli “Federico II”（那不勒斯费德里科二世大学）；INFN, Sezione di Napoli（意大利国家核物理研究所，那不勒斯分部）；Aix-Marseille Université（艾克斯-马赛大学）；Gran Sasso Science Institute (GSSI)（格兰萨索科学研究所）；INFN, Laboratori Nazionali del Gran Sasso（意大利国家核物理研究所，格兰萨索国家实验室）；Istituto Nazionale di Astrofisica - Osservatorio Astronomico di Roma（意大利天体物理学研究所-罗马天文台）；INFN, Sezione di Torino（意大利国家核物理研究所，都灵分部）；Università degli Studi di Torino（都灵大学）
The Critical Coupling Likelihood Method: A new approach for seamless integration of environmental and operating conditions of gravitational wave detectors into gravitational wave searches
