arXiv 1906.026302019-06-06astro-ph.EPastro-ph.IM

二元微透镜事件OGLE-2015-BLG-0060的分析

An analysis of binary microlensing event OGLE-2015-BLG-0060

Y. Tsapras, A. Cassan, C. Ranc, E. Bachelet, R. Street, A. Udalski, M. Hundertmark, V. Bozza, J. P. Beaulieu, J. B. Marquette, E. Euteneuer, The RoboNet team, :… 展开作者

Y. Tsapras, A. Cassan, C. Ranc, E. Bachelet, R. Street, A. Udalski, M. Hundertmark, V. Bozza, J. P. Beaulieu, J. B. Marquette, E. Euteneuer, The RoboNet team, :, D. M. Bramich, M. Dominik, R. Figuera Jaimes, K. Horne, S. Mao, J. Menzies, R. Schmidt, C. Snodgrass, I. A. Steele, J. Wambsganss, The OGLE collaboration, :, P. Mróz, M. K. Szymański, I. Soszyński, J. Skowron, P. Pietrukowicz, S. Kozłowski, R. Poleski, K. Ulaczyk, M. Pawlak, The MiNDSTEp collaboration, :, U. G. Jørgensen, J. Skottfelt, A. Popovas, S. Ciceri, H. Korhonen, M. Kuffmeier, D. F. Evans, N. Peixinho, T. C. Hinse, M. J. Burgdorf, J. Southworth, R. Tronsgaard, E. Kerins, M. I. Andersen, S. Rahvar, Y. Wang, O. Wertz, M. Rabus, S. Calchi Novati, G. D'Ago, G. Scarpetta, L. Mancini, The MOA collaboration, :, F. Abe, Y. Asakura, D. P. Bennett, A. Bhattacharya, M. Donachie, P. Evans, A. Fukui, Y. Hirao, Y. Itow, K. Kawasaki, N. Koshimoto, M. C. A. Li, C. H. Ling, K. Masuda, Y. Matsubara, Y. Muraki, S. Miyazaki, M. Nagakane, K. Ohnishi, N. Rattenbury, To. Saito, A. Sharan, H. Shibai, D. J. Sullivan, T. Sumi, D. Suzuki, P. J. Tristram, T. Yamada, A. Yonehara

备注：: 13 pages, 5 figures, Published in MNRAS
DOI：: 10.1093/mnras/stz1404

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摘要：

我们根据13台不同望远镜的观测结果对恒星双星微透镜事件OGLE-2015-BLG-0060进行了分析。通过拉斯坎布雷斯天文台的机器人望远镜进行自动跟踪观测，实现了对光变曲线异常部分的密集覆盖。我们发现，第一次，异常微透镜事件的所有主要特征都被后续数据很好地覆盖，使我们能够估计透镜的物理参数。事件光变曲线中二阶效应的强检测需要包括较长基线的调查数据，以约束视差矢量。我们发现这一事件很可能是由质量分别为$M_{\star1} = 0.87 \pm 0.12 M_{\odot}$和$M_{\star2} = 0.77 \pm 0.11 M_{\odot}$的双星透镜引起的。到透镜系统的距离为6.41 $\pm 0.14$ kpc，两个组件之间的投影间隔为13.85 $\pm 0.16$ AU。也考虑了其他解释。

英文摘要：

We present the analysis of stellar binary microlensing event OGLE-2015-BLG-0060 based on observations obtained from 13 different telescopes. Intensive coverage of the anomalous parts of the light curve was achieved by automated follow-up observations from the robotic telescopes of the Las Cumbres Observatory. We show that, for the first time, all main features of an anomalous microlensing event are well covered by follow-up data, allowing us to estimate the physical parameters of the lens. The strong detection of second-order effects in the event light curve necessitates the inclusion of longer-baseline survey data in order to constrain the parallax vector. We find that the event was most likely caused by a stellar binary-lens with masses $M_{\star1} = 0.87 \pm 0.12 M_{\odot}$ and $M_{\star2} = 0.77 \pm 0.11 M_{\odot}$. The distance to the lensing system is 6.41 $\pm 0.14$ kpc and the projected separation between the two components is 13.85 $\pm 0.16$ AU. Alternative interpretations are also considered.

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摘要：

英文摘要：

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