Setiawan J, Henning Th, Launhardt R, Müller A, Weise P, Kürster M
Max-Planck-Institut für Astronomie, Heidelberg, D-69117, Germany.
Nature. 2008 Jan 3;451(7174):38-41. doi: 10.1038/nature06426.
There is a general consensus that planets form within disks of dust and gas around newly born stars. Details of their formation process, however, are still a matter of ongoing debate. The timescale of planet formation remains unclear, so the detection of planets around young stars with protoplanetary disks is potentially of great interest. Hitherto, no such planet has been found. Here we report the detection of a planet of mass (9.8+/-3.3)M(Jupiter) around TW Hydrae (TW Hya), a nearby young star with an age of only 8-10 Myr that is surrounded by a well-studied circumstellar disk. It orbits the star with a period of 3.56 days at 0.04 au, inside the inner rim of the disk. This demonstrates that planets can form within 10 Myr, before the disk has been dissipated by stellar winds and radiation.
人们普遍认为行星是在新生恒星周围的尘埃和气体盘中形成的。然而，它们的形成过程细节仍在持续争论中。行星形成的时间尺度尚不清楚，因此探测围绕着具有原行星盘的年轻恒星的行星可能具有极大的研究价值。迄今为止，尚未发现这样的行星。在此我们报告在绘架座τ（TW Hya）这颗附近的年轻恒星周围探测到一颗质量为（9.8±3.3）木星质量（M(Jupiter)）的行星，该恒星年龄仅8 - 10百万年，周围环绕着一个经过充分研究的星周盘。它在距离恒星0.04天文单位处以3.56天的周期公转，位于星盘的内边缘之内。这表明行星能够在10百万年内形成，即在星盘被恒星风及辐射消散之前。
