AI 中文总结
利用LIGO O4a公开数据搜索脉冲星J0435+3233的连续引力波，针对特定频率及r模式信号，虽未探测到，但给出了引力波振幅上限，打破自旋-down上限并限制椭圆率在有趣范围。
AI 中文摘要
我们使用LIGO O4a公开数据搜索脉冲星J0435+3233的连续引力波。J0435+3233在毫秒脉冲星中很独特，其自旋-down异常大，是迄今在亚10毫秒自旋周期范围内首个自旋-down大于\(10^{-12}\)Hz/s的脉冲星，可能是连续引力波的强源。我们针对恰好两倍旋转频率、该频率附近窄带以及r模式信号进行搜索。结果未探测到。在95%置信水平下，对固有引力波振幅最严格上限是\(h_0=\targetedULninetyfive\)，比自旋-down极限低约14倍。估计源距离1.2千秒差距时，引力波振幅上限排除了大于\(\targetedellipULninetyfive\)的源椭圆率，这是首个自旋-down上限被超过一个数量级打破且椭圆率被限制在低\(10^{-8}\)区域这一物理有趣范围的源。
英文摘要
We perform a search for continuous gravitational waves from J0435+3233 using LIGO O4a public data. J0435+3233 is unique among millisecond pulsars as it exhibits an exceptionally large spin-down and marks the first pulsar observed to date with a spin-down larger than $10^{-12}$ Hz/s in the sub $10$ ms spin period range, making it a potentially strong source of continuous gravitational waves. We target signals at exactly twice the rotation frequency, a narrow band around this frequency, and also signals corresponding to r-modes. Our results are consistent with a non-detection. Our most stringent upper limit on the intrinsic gravitational wave amplitude at 95\% confidence is $h_0=5.8\times10^{-27}$. With an estimated source distance of 1.2 kpc this upper limit constraints the ellipticity to be smaller greater than $1.6\times10^{-8}$. If the observed spin-down is all intrinsic, this is the first source for which the spin-down upper limit is beaten by over an order of magnitude and the ellipticity is constrained to the physically very interesting range of the low $10^{-8}$ region.
