arXiv 1010.18092010-10astro-ph.EP

一颗亚土星质量行星，MOA-2009-BLG-319 Lb

A sub-Saturn Mass Planet, MOA-2009-BLG-319Lb

N. Miyake, T. Sumi, Subo Dong, R. Street, L. Mancini, A. Gould, D. P. Bennett, Y. Tsapras, J. C. Yee, M. D. Albrow, I. A. Bond, P. Fouque, P. Browne, C. Han, C.… 展开作者

N. Miyake, T. Sumi, Subo Dong, R. Street, L. Mancini, A. Gould, D. P. Bennett, Y. Tsapras, J. C. Yee, M. D. Albrow, I. A. Bond, P. Fouque, P. Browne, C. Han, C. Snodgrass, F. Finet, K. Furusawa, K. Harpsoe, W. Allen, M. Hundertmark, M. Freeman, D. Suzuki, F. Abe, C. S. Botzler, D. Douchin, A. Fukui, F. Hayashi, J. B. Hearnshaw, S. Hosaka, Y. Itow, K. Kamiya, P. M. Kilmartin, A. Korpela, W. Lin, C. H. Ling, S. Makita, K. Masuda, Y. Matsubara, Y. Muraki, T. Nagayama, K. Nishimoto, K. Ohnishi, Y. C. Perrott, N. Rattenbury, To. Saito, L. Skuljan, D. J. Sullivan, W. L. Sweatman, P. J. Tristram, K. Wada, P. C. M. Yock, The MOA Collaboration, G. Bolt, M. Bos, G. W. Christie, D. L. DePoy, J. Drummond, A. Gal-Yam, B. S. Gaudi, E. Gorbikov, D. Higgins, K. -H. Hwang J. Janczak, S. Kaspi, C. -U. Lee, J. -R. Koo, S. Koz lowski, Y. Lee, F. Mallia, A. Maury, D. Maoz, J. McCormick, L. A. G. Monard, D. Moorhouse, J. A. Mu~noz, T. Natusch, E. O. Ofek, R. W. Pogge, D. Polishook, R. Santallo, A. Shporer, O. Spector, G. Thornley, The Micro FUN Collaboration, A. Allan, D. M. Bramich, K. Horne, N. Kains, I. Steele, The RoboNet Collaboration, V. Bozza, M. J. Burgdorf, S. Calchi Novati, M. Dominik, S. Dreizler, M. Glitrup, F. V. Hessman, T. C. Hinse, U. G. Jorgensen, C. Liebig, G. Maier, M. Mathiasen, S. Rahvar, D. Ricci, G. Scarpetta, J. Skottfelt, J. Southworth, J. Surdej, J. Wambsganss, F. Zimmer, The MiNDSTEp Consortium, V. Batista, J. P. Beaulieu, S. Brillant, A. Cassan, A. Cole, E. Corrales, Ch. Coutures, S. Dieters, J. Greenhill, D. Kubas, J. Menzies, The PLANET Collaboration

备注：: accepted to ApJ, 28 pages, 6 figures, 3 tables
DOI：: 10.1088/0004-637X/728/2/120

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摘要：

我们报告了一颗亚土星质量行星MOA-2009-BLG-319 Lb的引力微透镜发现，该行星在银河系内盘或银河系凸起中围绕一颗K或M矮星运行。MOA-II巡天的高节奏观测发现了这一微透镜事件，并使其在峰值放大率之前约24小时被识别为高放大率事件。因此，在这个光变曲线的峰值处的行星信号被20个不同的望远镜观测到，这是迄今为止对行星发现做出贡献的望远镜数量最多的一次。这个事件的微透镜模型表明行星与恒星的质量比为q =（3.95 +/- 0.02）x 10^{-4}，距离d = 0.97537 +/- 0.00007（以爱因斯坦半径为单位）。基于测量的爱因斯坦半径交叉时间t_E和爱因斯坦半径角θ_E的贝叶斯分析，以及标准的银河系模型，表明主恒星质量为M_L = 0.38^{+0.34}_{-0.18} M_{Sun}，行星质量为M_p = 50^{+44}_{-24} M_{Earth}，是土星质量的一半。分析还得到行星-恒星的三维距离a = 2.4^{+1.2}-0.6} AU，到行星系的距离D_L = 6.1^{+1.1}-1.2} kpc。这个距离是雪线距离的2倍，类似于微透镜发现的大多数其他行星。

英文摘要：

We report the gravitational microlensing discovery of a sub-Saturn mass planet, MOA-2009-BLG-319Lb, orbiting a K or M-dwarf star in the inner Galactic disk or Galactic bulge. The high cadence observations of the MOA-II survey discovered this microlensing event and enabled its identification as a high magnification event approximately 24 hours prior to peak magnification. As a result, the planetary signal at the peak of this light curve was observed by 20 different telescopes, which is the largest number of telescopes to contribute to a planetary discovery to date. The microlensing model for this event indicates a planet-star mass ratio of q = (3.95 +/- 0.02) x 10^{-4} and a separation of d = 0.97537 +/- 0.00007 in units of the Einstein radius. A Bayesian analysis based on the measured Einstein radius crossing time, t_E, and angular Einstein radius, θ_E, along with a standard Galactic model indicates a host star mass of M_L = 0.38^{+0.34}_{-0.18} M_{Sun} and a planet mass of M_p = 50^{+44}_{-24} M_{Earth}, which is half the mass of Saturn. This analysis also yields a planet-star three-dimensional separation of a = 2.4^{+1.2}_{-0.6} AU and a distance to the planetary system of D_L = 6.1^{+1.1}_{-1.2} kpc. This separation is ~ 2 times the distance of the snow line, a separation similar to most of the other planets discovered by microlensing.

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