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arXiv 1012.5181astro-ph.EP
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凌日系外行星WASP-7的密度要低得多

A much lower density for the transiting extrasolar planet WASP-7

John Southworth, M. Dominik, U. G. Jorgensen, S. Rahvar, C. Snodgrass, K. Alsubai, V. Bozza, P. Browne, M. Burgdorf, S. Calchi Novati, P. Dodds, S. Dreizler, F.… 展开作者

John Southworth, M. Dominik, U. G. Jorgensen, S. Rahvar, C. Snodgrass, K. Alsubai, V. Bozza, P. Browne, M. Burgdorf, S. Calchi Novati, P. Dodds, S. Dreizler, F. Finet, T. Gerner, S. Hardis, K. Harpsoe, C. Hellier, T. C. Hinse, M. Hundertmark, N. Kains, E. Kerins, C. Liebig, L. Mancini, M. Mathiasen, M. T. Penny, S. Proft, D. Ricci, K. Sahu, G. Scarpetta, S. Schafer, F. Schonebeck, J. Surdej

摘要:

我们提出了第一个高精度测光的凌日系外行星系WASP-7,使用望远镜散焦技术,达到0.68毫等每点的散射。我们发现凌日深度更大,主星比以前认为的更进化。这颗行星的半径(1.330 +/- 0.093 Rjup对比0.915 + 0.046-0.040 Rjup)和低得多的密度(0.41 +/- 0.10 rhojup对1.26 + 0.25 - 0.21 rhojup)和表面重力(13.4 +/- 2.6 m/s2对26.4 + 4.4 - 4.0 m/s2)比以前的测量显示。根据修正后的性质,它不再是行星质量-半径和周期-重力图中的离群值。我们还获得了一个更精确的过境星历的WASP-7系统。

英文摘要:

We present the first high-precision photometry of the transiting extrasolar planetary system WASP-7, obtained using telescope defocussing techniques and reaching a scatter of 0.68 mmag per point. We find that the transit depth is greater and that the host star is more evolved than previously thought. The planet has a significantly larger radius (1.330 +/- 0.093 Rjup versus 0.915 +0.046 -0.040 Rjup) and much lower density (0.41 +/- 0.10 rhojup versus 1.26 +0.25 -0.21 rhojup) and surface gravity (13.4 +/- 2.6 m/s2 versus 26.4 +4.4 -4.0 m/s2) than previous measurements showed. Based on the revised properties it is no longer an outlier in planetary mass--radius and period--gravity diagrams. We also obtain a more precise transit ephemeris for the WASP-7 system.

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