七分钟轨道周期食双星系统中的广义相对论轨道衰减
太阳与恒星天体物理
2019-07-29 v1 高能天体物理现象
摘要
广义相对论预言短轨道周期双星会发射显著的引力辐射，即将发射的激光干涉空间天线（LISA）有望探测到数以万计此类系统；然而，目前极少被证认，且仅有一个是食双星——双白矮星双星 SDSS J065133.338+284423.37，其轨道周期为 12.75 分钟。在此，我们报告发现一个轨道周期仅 6.91 分钟的食双白矮星双星系统 ZTF J153932.16+502738.8。该系统的轨道周期接近 SDSS J065133.338+284423.37 的一半，且轨道极为致密，整个双星可纳入土星直径之内。该系统呈现深食与双线光谱特征。我们观测到快速的轨道衰减，与广义相对论预期一致。ZTF J153932.16+502738.8 是靠近 LISA 灵敏度峰值附近的显著引力辐射源，并应在 LISA 观测的首周内被探测到。
引用
@article{arxiv.1907.11291,
title = {General relativistic orbital decay in a seven-minute-orbital-period eclipsing binary system},
author = {Kevin B. Burdge and Michael W. Coughlin and Jim Fuller and Thomas Kupfer and Eric C. Bellm and Lars Bildsten and Matthew J. Graham and David L. Kaplan and Jan van Roestel and Richard G. Dekany and Dmitry A. Duev and Michael Feeney and Matteo Giomi and George Helou and Stephen Kaye and Russ R. Laher and Ashish A. Mahabal and Frank J. Masci and Reed Riddle and David L. Shupe and Maayane T. Soumagnac and Roger M. Smith and Paula Szkody and Richard Walters and S. R. Kulkarni and Thomas A. Prince},
journal= {arXiv preprint arXiv:1907.11291},
year = {2019}
}
备注
44 pages, 10 figures, 2 tables. Published online by Nature on July 24, 2019