A much lower density for the transiting extrasolar planet WASP-7
A much lower density for the transiting extrasolar planet WASP-7
复制标题
凌日系外行星 WASP-7 的密度要低得多
DOI：
10.1051/0004-6361/201016183
复制
发表时间：
2010
影响因子：
6.5
通讯作者：
J. Surdej
中科院分区：
文献类型：
--
作者：
J. Southworth;M. Dominik;U. Jørgensen;S. Rahvar;C. Snodgrass;K. Alsubai;V. Bozza;P. Browne;M. Burgdorf;S. Novati;P. Dodds;S. Dreizler;F. Finet;T. Gerner;S. Hardis;K. Harpsoe;C. Hellier;T. Hinse;M. Hundertmark;N. Kains;E. Kerins;C. Liebig;L. Mancini;M. Mathiasen;M. Penny;S. Proft;D. Ricci;K. Sahu;G. Scarpetta;S. Schafer;F. Schonebeck;J. Surdej
我们提出了凌日系外行星系统WASP-7的第一个高精度光度测量，使用望远镜散焦技术获得，每个点的散射值为0.68 mmag。我们发现凌日深度更大，主星的演化程度也比之前认为的要高。这颗行星的半径明显更大（1.330 - 0.093 R Jup vs; R Jup），密度则低得多(0.41 - 0.10 ？Jup对；？ 和表面重力（13.4±2.6 m s -2 vs . m s -2）比以前的测量结果显示。根据修正后的性质，它不再是行星质量半径图和周期引力图中的一个异常值。我们还获得了WASP-7系统更精确的凌日星历。基于MiNDSTEp用ESO拉西拉天文台的丹麦1.54米望远镜收集的数据。Lightcurves数据只能通过匿名ftp到cdsarc.u-strasbg.fr（130.79.128.5）或通过http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/527/A8以电子形式在CDS上获得
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 R Jup versus ; R Jup ) and much lower density (0.41 � 0.10 ? Jup versus ; ? Jup ) and surface gravity (13.4 � 2.6 m s -2 versus ; m s -2 ) 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. Based on data collected by MiNDSTEp with the Danish 1.54 m telescope at the ESO La Silla Observatory.Lightcurves data is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/527/A8
DOI：
10.1088/0004-637x/709/1/159
发表时间：
2009-08
期刊：
The Astrophysical Journal
影响因子：
--
作者：
D. Anderson;C. Hellier;M. Gillon;M. Gillon;A. Triaud;B. Smalley;L. Hebb;A. Cameron;P. Maxted;D. Queloz;R. West;S. Bentley;B. Enoch;K. Horne;T. Lister;M. Mayor;N. Parley;F. Pepe;D. Pollacco;D. Ségransan;S. Udry;D. Wilson;D. Wilson
通讯作者：
D. Anderson;C. Hellier;M. Gillon;M. Gillon;A. Triaud;B. Smalley;L. Hebb;A. Cameron;P. Maxted;D. Queloz;R. West;S. Bentley;B. Enoch;K. Horne;T. Lister;M. Mayor;N. Parley;F. Pepe;D. Pollacco;D. Ségransan;S. Udry;D. Wilson;D. Wilson