Systematic KMTNet Planetary Anomaly Search, Paper III: One Wide-Orbit Planet And Two Stellar Binaries
Hanyue Wang, Weicheng Zang, Wei Zhu, Kyu-Ha Hwang, Andrzej Udalski, Andrew Gould, Cheongho Han, Michael D. Albrow, Sun-Ju Chung, Youn Kil Jung, Doeon Kim, Yoon-… 展开作者
Hanyue Wang, Weicheng Zang, Wei Zhu, Kyu-Ha Hwang, Andrzej Udalski, Andrew Gould, Cheongho Han, Michael D. Albrow, Sun-Ju Chung, Youn Kil Jung, Doeon Kim, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Sang-Mok Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Radoslaw Poleski, Przemek Mróz, Jan Skowron, Michał K. Szymański, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof Ulaczyk, Krzysztof A. Rybicki, Patryk Iwanek, Marcin Wrona, Mariusz Gromadzki, Hongjing Yang, Shude Mao, Xiangyu Zhang
Only a few wide-orbit planets around old stars have been detected, which limits our statistical understanding of this planet population. Following the systematic search for planetary anomalies in microlensing events found by the Korea Microlensing Telescope Network (KMTNet), we present the discovery and analysis of three events that were initially thought to contain wide-orbit planets. The anomalous feature in the light curve of OGLE-2018-BLG-0383 is caused by a planet with mass ratio $q=2.1\times 10^{-4}$ and a projected separation $s=2.45$. This makes it the lowest mass-ratio microlensing planet at such wide orbits. The other two events, KMT-2018-BLG-0998 and OGLE-2018-BLG-0271, are shown to be stellar binaries ($q>0.1$) with rather close ($s<1$) separations. We briefly discuss the properties of known wide-orbit microlensing planets and show that the survey observations are crucial in discovering and further statistically constraining such a planet population.
Systematic KMTNet Planetary Anomaly Search. VI. Complete Sample of 2018 Sub-Prime-Field Planets
我们完成了对KMTNet Anomalysis确定的所有2018次主场微透镜行星的分析。在9个先前未发表的行星事件中,有6个明显是行星事件(KMT-2018-BLG-0030,KMT-2018-BLG-0087,KMT-2018-BLG-0247,OGLE-2018-BLG-0298,KMT-2018-BLG-2602和OGLE-2018-BLG-1119),而其余3个在性质上是模糊的。此外,有8个先前公布的次主场行星是由Anomalysts算法选出的。连同一篇关于2018年素场行星的配套论文(Gould et al. 2022),这项工作为基于KMTNet数据中识别的行星的行星质量比函数的首次统计分析奠定了基础。正如预期的那样(Zhu et al. 2014),2018年可能进入质量比分析的行星中有一半(17/33)具有非焦散交叉异常。然而,在5个具有行星-宿主质量比$q<10^{-3}$的非焦散异常中,只有1个是通过肉眼发现的(相比之下,12个具有$q>10^{-3}$的异常中有7个是通过肉眼发现的),这表明了半自动异常搜索的重要性。
Mass Production of 2023 KMTNet Microlensing Planets. III: Three Planets from the Subprime Field
Westlake University(西湖大学);Tsinghua University(清华大学);Korea Astronomy and Space Science Institute(韩国天文学与空间科学研究所);Astronomical Observatory, University of Warsaw(华沙大学天文台);Department of Earth and Space Science, Graduate School of Science, Osaka University(大阪大学理学研究科地球惑星科学专攻);Westlake Institute for Advanced Study(西湖高等研究院);University of Canterbury, School of Physical and Chemical Sciences(坎特伯雷大学物理与化学科学学院)
Mass Production of 2023 KMTNet Microlensing Planets. II: Two Planets and A Brown Dwarf
Westlake University(西湖大学);Tsinghua University(清华大学);Korea Astronomy and Space Science Institute(韩国天体宇宙科学研究所);Astronomical Observatory, University of Warsaw(华沙大学天文台);Department of Earth and Space Science, Graduate School of Science, Osaka University(大阪大学理学研究科地球・宇宙科学系);University of Canterbury, School of Physical and Chemical Sciences(坎特伯雷大学物理与化学科学学院)
Systematic KMTNet Planetary Anomaly Search. XIII. Complete Sample of 2021 Prime Field Planets
Westlake University(西湖大学);Chungbuk National University(忠北国立大学);Ohio State University(俄亥俄州立大学);Korea Astronomy and Space Science Institute(韩国天文和空间科学研究所);Massey University(梅西大学);Osaka University(大阪大学)
Mass Production of 2023 KMTNet Microlensing Planets I: Low Mass Ratio
Korea Astronomy and Space Science Institute(韩国天文与空间科学研究所);Astronomical Observatory, University of Warsaw(华沙大学天文台);Westlake University(西湖大学);Tsinghua University(清华大学);University of Chinese Academy of Sciences(中国科学院大学);Ohio State University(俄亥俄州立大学);University of Canterbury(坎特伯雷大学)
Encounters involving planetary systems in birth environments: the significant role of binaries
大多数恒星形成于一个集群环境中。单星和双星有时会在如此拥挤的环境中遇到行星系。遇到率的二进制可能会大于单星,即使是低至10- 20%.In这项工作中,我们调查之间的散射太阳-木星对和两个二进制和单星在年轻的集群。我们首先进行了一组模拟的遭遇,涉及广泛的双星和单星,发现更广泛的双星有更大的截面的行星弹射。其次,我们考虑这样的散射在一个现实的人口,绘制参数的双星和单星从观察到的人口。散射的结果是多种多样的,包括弹射,捕获/交换和碰撞。双星系统比单颗恒星更有效地导致行星的喷射和碰撞。因此,在一个集群中,只要二进制分数大于约10%,二进制将主导这两个结果的散射。对于恒星密度为50 pc $^{-3}$,寿命为1亿年,双星分数为0.5的疏散星团,我们估计大约有1%的彗星被抛出,0.1%与恒星相撞,0.1%改变所有权,10%的太阳-木星对在散射过程中获得恒星伴星。这些伴星通常相距1000个天文单位,在一半的情况下(占所有太阳-木星对的5%),它们可以通过Kozai-Lidov机制激发行星的轨道,然后被后来的遭遇剥离。我们的结果表明,太阳系可能曾经在其诞生星团中有过一个伴星。
Chemical signatures of planetary systems in their host stars. Near-infrared spectroscopy of four planet-hosting wide binaries
Yonsei University(延世大学);Chungnam National University(忠南国立大学);Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut(海德堡大学天文计算研究所);Korea Astronomy and Space Science Institute(韩国天体宇宙科学研究所)
Four Cold Super-Jupiters Revealed by Extended and Complex Microlensing Signals
Chungbuk National University(忠北国立大学);Korea Astronomy and Space Science Institute(韩国天文与空间科学研究所);University of Canterbury(坎特伯雷大学);Ohio State University(俄亥俄州立大学);University of Science and Technology(科学技术联合大学院大学);Weizmann Institute of Science(魏茨曼科学研究所)
KMT-2025-BLG-1616Lb: First Microlensing Bound Planet From DREAMS
Westlake Institute for Advanced Study(西湖高等研究院);Westlake University(西湖大学);Korea Astronomy and Space Science Institute(韩国天文与空间科学研究所);The University of Osaka(大阪大学);Tsinghua University(清华大学);Chungbuk National University(忠北国立大学)
Tracing outer planetary systems through white dwarf pollution in wide binaries
Pontificia Universidad Católica de Chile(智利天主教 Pontificia 大学);Universidad de Valparaíso(瓦尔帕莱索大学);NOIRLab(美国国家光学红外天文研究实验室);University of Cambridge(剑桥大学);Université de Montréal(蒙特利尔大学)
Planetary Desert around Compact Binaries: Dynamical Instability Triggered by Resonance-Induced Eccentricity Excitation
Institute for Astronomy, School of Physics, Zhejiang University(浙江大学物理学院天体物理研究所);Center for Cosmology and Computational Astrophysics, Institute for Advanced Study in Physics, Zhejiang University(浙江大学物理高等研究院宇宙学与计算天体物理中心);Tsung-Dao Lee Institute, Shanghai Jiao Tong University(上海交通大学李政道研究所);Department of Astronomy, Center for Astrophysics and Planetary Science, Cornell University(康奈尔大学天文学系天文与行星科学中心)
Planetary Accretion Is Less Frequent in Wide Binaries: Evidence from Metal-Enriched White Dwarfs in DESI DR1
Gemini Observatory/NSF NOIRLab(吉米尼天文台/美国国家光学红外天文研究实验室);Department of Physics, University of Warwick(华威大学物理系);Institute for Astronomy, University of Edinburgh, Royal Observatory(爱丁堡大学天文研究所皇家天文台);Institute of Astronomy, University of Cambridge(剑桥大学天文研究所);Astrophysics Group, Department of Physics, Imperial College London(帝国理工学院物理系天体物理学组);Department of Astronomy & Astrophysics, University of Toronto(多伦多大学天文学与天体物理系);Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong Univer(上海交通大学物理与天文学院天文学系)