THE FIRST SIMULTANEOUS MICROLENSING OBSERVATIONS BY TWO SPACE TELESCOPES: SPITZER AND SWIFT REVEAL A BROWN DWARF IN EVENT OGLE-2015-BLG-1319
THE FIRST SIMULTANEOUS MICROLENSING OBSERVATIONS BY TWO SPACE TELESCOPES: SPITZER AND SWIFT REVEAL A BROWN DWARF IN EVENT OGLE-2015-BLG-1319
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DOI：
10.3847/0004-637x/831/2/183
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
Y. Shvartzvald;Z. Li;A. Udalski;A. Gould;T. Sumi;R. Street;S. Novati;M. Hundertmark;V. Bozza;C. Beichman;G. Bryden;S. Carey;J. Drummond;M. Fausnaugh;B. Gaudi;C. Henderson;T. Tan;B. Wibking;R. Pogge;J. Yee;W. Zhu;Y. Tsapras;E. Bachelet;M. Dominik;D. Bramich;A. Cassan;R. Jaimes;K. Horne;C. Ranc;R. Schmidt;C. Snodgrass;J. Wambsganss;I. Steele;J. Menzies;S. Mao;R. Poleski;M. Pawlak;M. Szyma'nski;J. Skowron;P. Mr'oz;S. Kozłowski;Ł. Wyrzykowski;P. Pietrukowicz;I. Soszy'nski;K. Ulaczyk;F. Abe;Y. Asakura;R. Barry;D. Bennett;A. Bhattacharya;I. Bond;M. Freeman;Y. Hirao;Y. Itow;N. Koshimoto;M. Li;C. Ling;K. Masuda;A. Fukui;Y. Matsubara;Y. Muraki;M. Nagakane;T. Nishioka;K. Ohnishi;H. Oyokawa;N. Rattenbury;T. Saito;A. Sharan;D. Sullivan;D. Suzuki;P. Tristram;A. Yonehara;U. Jørgensen;M. Burgdorf;S. Ciceri;G. D’ago;D. Evans;T. Hinse;N. Kains;E. Kerins;H. Korhonen;L. Mancini;A. Popovas;M. Rabus;S. Rahvar;G. Scarpetta;J. Skottfelt;J. Southworth;N. Peixinho;P. Verma;B. Sbarufatti;J. Kennea;N. Gehrels
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文献类型：
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作者：
Y. Shvartzvald;Z. Li;A. Udalski;A. Gould;T. Sumi;R. Street;S. Novati;M. Hundertmark;V. Bozza;C. Beichman;G. Bryden;S. Carey;J. Drummond;M. Fausnaugh;B. Gaudi;C. Henderson;T. Tan;B. Wibking;R. Pogge;J. Yee;W. Zhu;Y. Tsapras;E. Bachelet;M. Dominik;D. Bramich;A. Cassan;R. Jaimes;K. Horne;C. Ranc;R. Schmidt;C. Snodgrass;J. Wambsganss;I. Steele;J. Menzies;S. Mao;R. Poleski;M. Pawlak;M. Szyma'nski;J. Skowron;P. Mr'oz;S. Kozłowski;Ł. Wyrzykowski;P. Pietrukowicz;I. Soszy'nski;K. Ulaczyk;F. Abe;Y. Asakura;R. Barry;D. Bennett;A. Bhattacharya;I. Bond;M. Freeman;Y. Hirao;Y. Itow;N. Koshimoto;M. Li;C. Ling;K. Masuda;A. Fukui;Y. Matsubara;Y. Muraki;M. Nagakane;T. Nishioka;K. Ohnishi;H. Oyokawa;N. Rattenbury;T. Saito;A. Sharan;D. Sullivan;D. Suzuki;P. Tristram;A. Yonehara;U. Jørgensen;M. Burgdorf;S. Ciceri;G. D’ago;D. Evans;T. Hinse;N. Kains;E. Kerins;H. Korhonen;L. Mancini;A. Popovas;M. Rabus;S. Rahvar;G. Scarpetta;J. Skottfelt;J. Southworth;N. Peixinho;P. Verma;B. Sbarufatti;J. Kennea;N. Gehrels
从多个位置同时观察微透镜事件允许打破透镜系统的物理性质之间的简并，特别是通过探索透镜平面的不同区域和通过直接测量“微透镜视差”。我们报告在微透镜事件OGLE-2015-BLG-1319中发现了一颗30- 65 MJ的褐矮星绕K矮星运行。该系统位于距离银河系隆起2.5kpc处。这一事件被几个地面小组以及斯皮策和斯威夫特观测到，从而可以测量物理性质。然而，该事件仍然受到八重简并的影响，特别是众所周知的近宽简并，因此两个透镜组件之间的投影分离是0.25 Au或0.45 Au。这是Swift使用UVOT相机观察到的第一个微透镜事件。我们研究了该地区的微透镜参数空间斯威夫特是敏感的，发现虽然斯威夫特不能测量微透镜视差相对于地面观测这一事件，它可以是重要的其他事件。具体来说，它对于在高放大率事件中探测附近的褐矮星和自由漂浮的行星非常重要。
Simultaneous observations of microlensing events from multiple locations allow for the breaking of degeneracies between the physical properties of the lensing system, specifically by exploring different regions of the lens plane and by directly measuring the “microlens parallax.” We report the discovery of a 30–65MJ brown dwarf orbiting a K dwarf in the microlensing event OGLE-2015-BLG-1319. The system is located at a distance of ∼5 kpc toward the Galactic Bulge. The event was observed by several ground-based groups as well as by Spitzer and Swift, allowing a measurement of the physical properties. However, the event is still subject to an eight-fold degeneracy, in particular the well-known close-wide degeneracy, and thus the projected separation between the two lens components is either ∼0.25 au or ∼45 au. This is the first microlensing event observed by Swift, with the UVOT camera. We study the region of microlensing parameter space to which Swift is sensitive, finding that though Swift could not measure the microlens parallax with respect to ground-based observations for this event, it can be important for other events. Specifically, it is important for detecting nearby brown dwarfs and free-floating planets in high magnification events.