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arXiv 1001.0403astro-ph.EPastro-ph.SR
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WASP-19 b:迄今发现的最短周期过境系外行星

WASP-19b: the shortest period transiting exoplanet yet discovered

Leslie Hebb, A. Collier-Cameron, A. H. M. J. Triaud, T. A. Lister, B. Smalley, P. F. L. Maxted, C. Hellier, D. R. Anderson, D. Pollacco, M. Gillon, D. Queloz, R… 展开作者

Leslie Hebb, A. Collier-Cameron, A. H. M. J. Triaud, T. A. Lister, B. Smalley, P. F. L. Maxted, C. Hellier, D. R. Anderson, D. Pollacco, M. Gillon, D. Queloz, R. G. West, S. Bentley, B. Enoch, C. A. Haswell, K. Horne, M. Mayor, F. Pepe, D. Segransan, I. Skillen, S. Udry, P. J. Wheatley

摘要:

我们报告发现了一颗新的极短周期凌日系外行星WASP-19 b。该行星的质量Mpl = 1.15 \pm 0.08 MJ,半径Rpl = 1.31 \pm 0.06 RJ,轨道周期P = 0.7888399 \pm 0.000008天。通过光谱分析,我们确定该主星是一颗金属丰度略超太阳的G矮星([M/H] = 0.1 \pm 0.1 dex),Teff = 5500 \pm 100 K。此外,我们检测周期性的,正弦的光变曲线中的流量变化,用于获得旋转周期的恒星质子= 10.5 \pm 0.2天。相对较短的恒星自转周期表明WASP-19有些年轻(约6亿年),或者两个天体之间的潮汐相互作用导致行星在其一生中向内螺旋,导致恒星旋转。由于检测的旋转周期,这个系统有可能把强大的约束恒星潮汐品质因数,Q的,如果一个更精确的年龄确定。

英文摘要:

We report on the discovery of a new extremely short period transiting extrasolar planet, WASP-19b. The planet has mass Mpl = 1.15 \pm 0.08 MJ, radius Rpl = 1.31 \pm 0.06 RJ, and orbital period P = 0.7888399 \pm 0.0000008 days. Through spectroscopic analysis, we determine the host star to be a slightly super-solar metallicity ([M/H] = 0.1 \pm 0.1 dex) G-dwarf with Teff = 5500 \pm 100 K. In addition, we detect periodic, sinusoidal flux variations in the light curve which are used to derive a rotation period for the star of Prot = 10.5 \pm 0.2 days. The relatively short stellar rotation period suggests that either WASP-19 is somewhat young (~ 600 Myr old) or tidal interactions between the two bodies have caused the planet to spiral inward over its lifetime resulting in the spin-up of the star. Due to the detection of the rotation period, this system has the potential to place strong constraints on the stellar tidal quality factor, Q's, if a more precise age is determined.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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