一颗冷海王星质量行星OGLE-2007-BLG-368Lb：冷海王星是常见的
地球与行星天体物理
2012-08-27 v3
摘要
我们通过引力微透镜法发现了一颗海王星质量行星OGLE-2007-BLG-368Lb，其行星-恒星质量比为 。得益于MOA巡天的高观测频率、实时光变曲线监测以及密集的后续观测，该行星偏离信号被实时探测到。贝叶斯分析给出的恒星质量和距离分别为 和 kpc，因此行星的质量和分离距离分别为 和 AU。这一发现为微透镜法发现的行星样本增添了一颗冷海王星质量行星，该样本目前包括四颗冷海王星/超级地球、五颗气态巨行星，以及另一颗性质不明的亚土星质量行星。通过微透镜法发现这十颗冷系外行星意味着，冷系外行星的质量比函数按 标度，且95%置信水平的上限为 （其中 ）。由于微透镜法对雪线以外的行星最为敏感，这意味着在95%置信水平下，该区域中海王星质量行星的丰度至少是木星的三倍。
引用
@article{arxiv.0912.1171,
title = {A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes Are Common},
author = {T. Sumi and D. P. Bennett and I. A. Bond and A. Udalski and V. Batista and M. Dominik and P. Fouqué and D. Kubas and A. Gould and B. Macintosh and K. Cook and S. Dong and L. Skuljan and A. Cassan and The MOA Collaboration and : and F. Abe and C. S. Botzler and A. Fukui and K. Furusawa and J. B. Hearnshaw and Y. Itow and K. Kamiya and P. M. Kilmartin and A. Korpela and W. Lin and C. H. Ling and K. Masuda and Y. Matsubara and N. Miyake and Y. Muraki and M. Nagaya and T. Nagayama and K. Ohnishi and T. Okumura and Y. C. Perrott and N. Rattenbury and To. Saito and T. Sako and D. J. Sullivan and W. L. Sweatman and P. and P. C. M. Yock and The PLANET Collaboration and : and J. P. Beaulieu and A. Cole and Ch. Coutures and M. F. Duran and J. Greenhill and F. Jablonski and U. Marboeuf and E. Martioli and E. Pedretti and O. Pejcha and P. Rojo and M. D. Albrow and S. Brillant and M. Bode and D. M. Bramich and M. J. Burgdorf and J. A. R. Caldwell and H. Calitz and E. Corrales and S. Dieters and D. Dominis Prester and J. Donatowicz and K. Hill and M. Hoffman and K. Horne and U. G. J and N. Kains and S. Kane and J. B. Marquette and R. Martin and P. Meintjes and J. Menzies and K. R. Pollard and K. C. Sahu and C. Snodgrass and I. Steele and R. Street and Y. Tsapras and J. Wambsganss and A. Williams and M. Zub and The OGLE Collaboration and : and M. K. Szyma and M. Kubiak and G. Pietrzy and I. Soszy and O. Szewczyk and K. Ulaczyk and The microFUN Collaboration and : and W. Allen and G. W. Christie and D. L. DePoy and B. S. Gaudi and C. Han and J. Janczak and C. -U. Lee and J. McCormick and F. Mallia and B. Monard and T. Natusch and B. -G. Park and R. W. Pogge and R. Santallo},
journal= {arXiv preprint arXiv:0912.1171},
year = {2012}
}
备注
39 pages, 10 figures, accepted for publication in ApJ