论文标题
在银河中心附近自由浮动行星微透明事件的同时视差检测的概率
Probability of simultaneous parallax detection for free-floating planet microlensing events near Galactic Centre
论文作者
论文摘要
自由浮动行星（FFP）微透明事件的事件速率和质量估计的效率是根据通过Euclid，wfirst和LSST的同时观察观察结果的模拟确定的。从Besançon银河模型到$（l，b）=（1^{\ circ}， - 1。星际灰尘，未解决的恒星背景，附近的恒星混合物进行了建模。考虑到有限源效应确定事件可检测性的信号到噪声限制。在视差观察中，欧几里得第一组合在每年两个30天周期中产生30.7个木星质量FFP。对于地球质量行星，视差事件速率降至3.9 FFP。从视差光曲线中的质量估计使FFP质量恢复到20倍以内的20-26％的病例。同一时期，Euclid-LSST组合产生的34.5个木星质量FFPS下降到0.5个地球质量FFP，质量在20-40％的病例中恢复到2倍以内。事件速率将通过未知的FFP丰度归一化，以恢复预期检测的数量。
The event rate and the efficiency of mass estimation for free-floating planet (FFP) microlensing events were determined from the simulation of the simultaneous parallax observations by Euclid, WFIRST, and LSST. The stellar population from the Besançon Galactic model toward $(l, b)=(1^{\circ},-1.^{\circ}75)$ was applied to our 3D microlensing model, and 30,000 parallax observations were simulated for each following FFP lens masses: Jupiter-mass, Neptune-mass, and Earth-mass assuming the population of one FFP per star. The interstellar dust, unresolved stellar background, nearby star blending were modelled. A signal-to-noise limit considering a finite source effect determined the event detectability. The Euclid-WFIRST combination yielded 30.7 Jupiter-mass FFPs during two 30-day-periods per year in parallax observation. The parallax event rate decreases to 3.9 FFPs for Earth-mass planets. The mass estimation from the parallax light curve allowed recovery of FFP masses to within a factor of two for 20-26% of cases. The Euclid-LSST combination yielded 34.5 Jupiter-mass FFPs down to 0.5 Earth-mass FFPs for the same periods and the mass is recovered to within a factor of two in 20-40% of cases. The event rate will be normalised by the unknown FFP abundance to recover the number of expected detections.
