微引力透镜事件OGLE-2011-BLG-0251中雪线外的一颗巨行星
地球与行星天体物理
2015-06-15 v1
摘要
我们呈现了对引力微透镜事件OGLE-2011-BLG-0251的分析。这个异常事件由多个进行银河系核球方向微透镜观测的巡天和后续观测合作组观测到。基于对观测光变曲线的详细建模，我们发现透镜由两个质量组成，质量比q=1.9×10^-3。由于我们探测到了由地球轨道运动和源有限大小引起的光变曲线高阶效应，我们能够明确地测量透镜的质量和距离。我们发现透镜由一颗质量为0.53±0.21 M_Jup的行星和一颗质量为0.26±0.11 M_Sun的M矮星宿主星组成。该行星系统位于朝向银河系中心距离2.57±0.61 kpc处。行星与其宿主星的投影分离为d=1.408±0.019（以爱因斯坦半径为单位），对应物理单位2.72±0.75 AU。我们还确定了一个竞争模型，其行星和宿主星质量相似，但轨道半径较小，为1.50±0.50 AU。因此，该行星位于其宿主星雪线之外，我们估计雪线约为1-1.5 AU。
关键词
引用
@article{arxiv.1303.1184,
title = {A Giant Planet beyond the Snow Line in Microlensing Event OGLE-2011-BLG-0251},
author = {N. Kains and R. Street and J. -Y. Choi and C. Han and A. Udalski and L. A. Almeida and F. Jablonski and P. Tristram and U. G. Jorgensen and M. K. Szymanski and M. Kubiak and G. Pietrzynski and I. Soszynski and R. Poleski and S. Kozlowski and P. Pietrukowicz and K. Ulaczyk and L. Wyrzykowski and J. Skowron and K. A. Alsubai and V. Bozza and P. Browne and M. J. Burgdorf and S. Calchi Novati and P. Dodds and M. Dominik and S. Dreizler and X. -S. Fang and F. Grundahl and C. -H. Gu and S. Hardis and K. Harpsoe and F. V. Hessman and T. C. Hinse and A. Hornstrup and M. Hundertmark and J. Jessen-Hansen and E. Kerins and C. Liebig and M. Lund and M. Lundkvist and L. Mancini and M. Mathiasen and M. T. Penny and S. Rahvar and D. Ricci and K. C. Sahu and G. Scarpetta and J. Skottfelt and C. Snodgrass and J. Southworth and J. Surdej and J. Tregloan-Reed and J. Wambsganss and O. Wertz and D. Bajek and D. M. Bramich and K. Horne and S. Ipatov and I. A. Steele and Y. Tsapras and F. Abe and D. P. Bennett and I. A. Bond and C. S. Botzler and P. Chote and M. Freeman and A. Fukui and K. Furusawa and Y. Itow and C. H. Ling and K. Masuda and Y. Matsubara and N. Miyake and Y. Muraki and K. Ohnishi and N. Rattenbury and T. Saito and D. J. Sullivan and T. Sumi and D. Suzuki and K. Suzuki and W. L. Sweatman and S. Takino and K. Wada and P. C. M. Yock and W. Allen and V. Batista and S. -J. Chung and G. Christie and D. L. DePoy and J. Drummond and B. S. Gaudi and A. Gould and C. Henderson and Y. -K. Jung and J. -R. Koo and C. -U. Lee and J. McCormick and D. McGregor and J. A. Munoz and T. Natusch and H. Ngan and H. Park and R. W. Pogge and I. -G. Shin and J. Yee and M. D. Albrow and E. Bachelet and J. -P. Beaulieu and S. Brillant and J. A. R. Caldwell and A. Cassan and A. Cole and E. Corrales and Ch. Coutures and S. Dieters and D. Dominis Prester and J. Donatowicz and P. Fouque and J. Greenhill and S. R. Kane and D. Kubas and J. -B. Marquette and R. Martin and P. Meintjes and J. Menzies and K. R. Pollard and A. Williams and D. Wouters and M. Zub},
journal= {arXiv preprint arXiv:1303.1184},
year = {2015}
}
备注
12 pages, 7 figures, 3 tables; A&A in press