凌星系外行星WASP-7的密度远低于此前测量值
地球与行星天体物理
2015-05-20 v1
摘要
我们首次展示了凌星系外行星系统WASP-7的高精度测光数据，这些数据通过望远镜散焦技术获得，每点散射为0.68 mmag。我们发现凌星深度更大，且主星比先前认为的更演化。该行星的半径显著更大（1.330 ± 0.093 Rjup 对比 0.915 +0.046 -0.040 Rjup），密度（0.41 ± 0.10 ρjup 对比 1.26 +0.25 -0.21 ρjup）和表面重力（13.4 ± 2.6 m/s² 对比 26.4 +4.4 -4.0 m/s²）则远低于先前测量值。基于修正后的性质，它不再是行星质量-半径和周期-重力图中的异常值。我们还获得了WASP-7系统更精确的凌星历表。
引用
@article{arxiv.1012.5181,
title = {A much lower density for the transiting extrasolar planet WASP-7},
author = {John Southworth and M. Dominik and U. G. Jorgensen and S. Rahvar and C. Snodgrass and K. Alsubai and V. Bozza and P. Browne and M. Burgdorf and S. Calchi Novati and P. Dodds and S. Dreizler and F. Finet and T. Gerner and S. Hardis and K. Harpsoe and C. Hellier and T. C. Hinse and M. Hundertmark and N. Kains and E. Kerins and C. Liebig and L. Mancini and M. Mathiasen and M. T. Penny and S. Proft and D. Ricci and K. Sahu and G. Scarpetta and S. Schafer and F. Schonebeck and J. Surdej},
journal= {arXiv preprint arXiv:1012.5181},
year = {2015}
}
备注
Accepted for publication as a Research Note in A&A. 5 pages, 4 tables, 3 figures