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OGLE-2006-BLG-109 Lb,c木星/土星类似行星系的质量和轨道约束

Masses and Orbital Constraints for the OGLE-2006-BLG-109Lb,c Jupiter/Saturn Analog Planetary System

D. P. Bennett, S. H. Rhie, S. Nikolaev, B. S. Gaudi, A. Udalski, A. Gould, G. W. Christie, D. Maoz, S. Dong, J. McCormick, M. K. Szymanski, P. J. Tristram, B. M… 展开作者

D. P. Bennett, S. H. Rhie, S. Nikolaev, B. S. Gaudi, A. Udalski, A. Gould, G. W. Christie, D. Maoz, S. Dong, J. McCormick, M. K. Szymanski, P. J. Tristram, B. Macintosh, K. H. Cook, M. Kubiak, G. Pietrzynski, I. Soszynski, O. Szewczyk, K. Ulaczyk, L. Wyrzykowski, D. L. DePoy, C. Han, S. Kaspi, C. -U. Lee, F. Mallia, T. Natusch, B. -G. Park, R. W. Pogge, D. Polishook, F. Abe, I. A. Bond, C. S. Botzler, A. Fukui, J. B. Hearnshaw, Y. Itow, K. Kamiya, A. V. Korpela, P. M. Kilmartin, W. Lin, K. Masuda, Y. Matsubara, M. Motomura, Y. Muraki, S. Nakamura, T. Okumura, K. Ohnishi, Y. C. Perrott, N. J. Rattenbury, T. Sako, To. Saito, S. Sato, L. Skuljan, D. J. Sullivan, T. Sumi, W. L. Sweatman, P. C. M. Yock, M. Albrow, A. Allan, J. -P. Beaulieu, D. M. Bramich, M. J. Burgdorf, C. Coutures, M. Dominik, S. Dieters, P. Fouque, J. Greenhill, K. Horne, C. Snodgrass, I. Steele, Y. Tsapras, B. Chaboyer, A. Crocker, S. Frank

摘要:

我们提出了一个新的分析木星+土星模拟系统,OGLE-2006-BLG-109 Lb,c,这是第一个双行星系统发现的引力微透镜方法。这是唯一一个通过任何方法发现的多行星系统,测量了恒星和两颗行星的质量。除了两颗行星的特征外,该事件还表现出微透镜视差特征和有限源效应,这些特征提供了对恒星和行星质量的直接测量,并且通过Keck AO成像证实了宿主恒星的预期亮度,得到质量M * = 0.51(+0.05-0.04)太阳系,M_b = 231+-19 M_earth,M_c = 86+-7 M_earth.这个系统中的土星类似行星有一个持续11天的行星光变曲线偏差,因此,轨道运动的影响在微透镜光变曲线中是可见的。我们发现,六个轨道参数中的四个是严格约束的,第五个参数,轨道加速度,是弱约束的。没有类似木星的行星的轨道信息,但它的存在有助于限制类似土星的行星的轨道运动。假设共面轨道,我们发现轨道偏心率= 0.15(+0.17-0.10)和轨道倾角i = 64(+4-7)度。倾斜度i > 49 °的95%置信水平下限。这意味着这个行星系可以用口径大于30米的望远镜通过径向速度测量来探测和研究。

英文摘要:

We present a new analysis of the Jupiter+Saturn analog system, OGLE-2006-BLG-109Lb,c, which was the first double planet system discovered with the gravitational microlensing method. This is the only multi-planet system discovered by any method with measured masses for the star and both planets. In addition to the signatures of two planets, this event also exhibits a microlensing parallax signature and finite source effects that provide a direct measure of the masses of the star and planets, and the expected brightness of the host star is confirmed by Keck AO imaging, yielding masses of M_* = 0.51(+0.05-0.04) M_sun, M_b = 231+-19 M_earth, M_c = 86+-7 M_earth. The Saturn-analog planet in this system had a planetary light curve deviation that lasted for 11 days, and as a result, the effects of the orbital motion are visible in the microlensing light curve. We find that four of the six orbital parameters are tightly constrained and that a fifth parameter, the orbital acceleration, is weakly constrained. No orbital information is available for the Jupiter-analog planet, but its presence helps to constrain the orbital motion of the Saturn-analog planet. Assuming co-planar orbits, we find an orbital eccentricity of eccentricity = 0.15 (+0.17-0.10) and an orbital inclination of i = 64 (+4-7) deg. The 95% confidence level lower limit on the inclination of i > 49 deg. implies that this planetary system can be detected and studied via radial velocity measurements using a telescope of >30m aperture.

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