Euclid-Roman joint microlensing survey: Early mass measurement, free floating planets, and exomoons
Euclid-Roman joint microlensing survey: Early mass measurement, free floating planets, and exomoons
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欧几里得-罗马联合微透镜勘测：早期质量测量、自由漂浮行星和系外卫星
DOI：
10.1051/0004-6361/202140351
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发表时间：
2022
影响因子：
6.5
通讯作者：
Meade, E.
中科院分区：
文献类型：
--
作者：
Bachelet, E.;Specht, D.;Penny, M.;Hundertmark, M.;Awiphan, S.;Beaulieu, J.-P.;Dominik, M.;Kerins, E.;Maoz, D.;Meade, E.
正如开普勒计划对热系外行星所做的那样，欧空局和美国国家航空航天局的任务有可能在我们对冷系外行星（包括未绑定或自由浮动的行星）的人口统计学理解上取得突破。罗马将把其核心调查计划的一部分用于通过微透镜探测冷系外行星，而欧罗巴可能会将微透镜计划作为辅助科学目标。在这项研究中，我们论证了这两个任务的互补性，并提出了两个联合调查，以更好地约束微透镜事件的质量和距离。我们首先证明，对罗马微透镜场进行早期的简要核测量（~7小时）将允许测量至少30%的事件的相对固有运动和42%的透镜星等。这项调查将对罗曼在第一年观测到的数千个微透镜事件的质量和距离施加严格的限制。然后，我们研究了romananddeuclid同时观测的潜力，以实现对最短微透镜事件的微透镜视差测量，并最终获得对FFPs质量，距离和横向运动的直接测量。通过对联合探测产量的详细模拟，我们表明，在一年内，罗马-欧几里得观测将比目前的地面测量至少灵敏一个数量级。最近OGLE调查对过量短时间事件的初步探测与每颗银河系恒星多达10个地球质量的FFPs的设想是一致的。在这种情况下，联合introman - euclidcampaign应该在一年内检测到大约130个FFP事件，包括110个测量到的视差强烈限制FFP质量的事件，以及大约30个直接测量质量和距离的FFP事件。联合调查完全打破微透镜质量-距离-速度简并的能力提供了一个独特的机会，可以明确地验证FFP假设，或者为地球和木星质量之间的FFP设定丰度限制，这比地面调查提供的要强两个数量级。最后，我们研究了联合调查增强系外卫星探测和表征的能力，并发现它可能导致第一颗系外卫星的探测。
As theKeplermission has done for hot exoplanets, the ESAEuclidand NASARomanmissions have the potential to create a breakthrough in our understanding of the demographics of cool exoplanets, including unbound, or free-floating, planets (FFPs).Romanwill dedicate part of its core survey program to the detection of cool exoplanets via microlensing, whileEuclidmay undertake a microlensing program as an ancillary science goal. In this study, we demonstrate the complementarity of the two missions and propose two joint surveys to better constrain the mass and distance of microlensing events. We first demonstrate that an early briefEuclidsurvey (~7 h) of theRomanmicrolensing fields will allow the measurement of at least 30% of the events’ relative proper motionsµreland 42% of the lens magnitudes. This survey would place strong constraints on the mass and distance on thousands of microlensing events observed byRomanjust after the first year of observation. Then, we study the potential of simultaneous observations byRomanandEuclidto enable the measurement of the microlensing parallax for the shortest microlensing events and, ultimately, obtain a direct measurement of the masses, distances, and transverse motions of FFPs. Using detailed simulations of the joint detection yield we show that within one yearRoman-Euclidobservations will be at least an order of magnitude more sensitive than current ground-based measurements. The recent tentative detection of an excess of short-duration events by the OGLE survey is consistent with a scenario of up to ten Earth-mass FFPs per Galactic star. For such a scenario a jointRoman-Euclidcampaign should detect around 130 FFP events within a year, including 110 with measured parallax that strongly constrain the FFP mass, and around 30 FFP events with direct mass and distance measurements. The ability of the joint survey to completely break the microlens mass-distance-velocity degeneracy for a significant subset of events provides a unique opportunity to verify unambiguously the FFP hypothesis or else place abundance limits for FFPs between Earth and Jupiter masses that are up to two orders of magnitude stronger than provided by ground-based surveys. Finally, we study the capabilities of the joint survey to enhance the detection and characterization of exomoons, and find that it could lead to the detection of the first exomoon.
DOI：
10.1007/978-3-319-55333-7_143
发表时间：
2010
期刊：
arXiv: Earth and Planetary Astrophysics
影响因子：
--
作者：
C. Mordasini
通讯作者：
C. Mordasini