利用默奇森宽场阵列对南天系外行星低频射电辐射的限制
地球与行星天体物理
2015-06-23 v2 天体物理仪器与方法
摘要
我们展示了利用默奇森宽场阵列（Murchison Widefield Array）对 17 个已知系外行星系统进行低频射电辐射巡天的结果。该样本包含 13 个此前未进行过射电观测的系统。我们在 154 MHz 频率下未检测到射电辐射，并给出了该辐射 3 sigma 上限，范围为 15.2-112.5 mJy。我们还搜索了圆偏振辐射，同样未检测到信号，获得的 3 sigma 上限范围为 3.4-49.9 mJy。这些结果与现有文献中最佳的低频射电限制相当；若假设辐射为 100% 圆偏振，则对应的光度限制介于 1.2 x 10^14 W 和 1.4 x 10^17 W 之间。这是利用 MWA 系统性搜索系外行星辐射的大型项目的首批结果。
引用
@article{arxiv.1410.6819,
title = {Limits on low frequency radio emission from southern exoplanets with the Murchison Widefield Array},
author = {Tara Murphy and Martin E. Bell and David L. Kaplan and B. M. Gaensler and Andre R. Offringa and Emil Lenc and Natasha Hurley-Walker and G. Bernardi and J. D. Bowman and F. Briggs and R. J. Cappallo and B. E. Corey and A. A. Deshpande and D. Emrich and R. Goeke and L. J. Greenhill and B. J. Hazelton and J. N. Hewitt and M. Johnston-Hollitt and J. C. Kasper and E. Kratzenberg and C. J. Lonsdale and M. J. Lynch and S. R. McWhirter and D. A. Mitchell and M. F. Morales and E. Morgan and D. Oberoi and S. M. Ord and T. Prabu and A. E. E. Rogers and D. A. Roshi and N. Udaya Shankar and K. S. Srivani and R. Subrahmanyan and S. J. Tingay and M. Waterson and R. B. Wayth and R. L. Webster and A. R. Whitney and A. Williams and C. L. Williams},
journal= {arXiv preprint arXiv:1410.6819},
year = {2015}
}
备注
Accepted for publication in MNRAS. Updated author list from last revision