Year: 2026
Type: article
Abstract: We present observations and analysis of the bound planetary microlensing event KMT-2025-BLG-1616. The planetary signal was captured by the Korea Microlensing Telescope Network and the Dark Energy Camera Rogue Earths and Mars Survey (DREAMS). DREAMS’s minute-cadence observations break the central/resonant degeneracy in the binary-lens models. The color of the faint source star ( I = 22) is measured from the DREAMS’s r − z color. The planetary system has a planet-host mass ratio of q ∼ 5 × 10 −4 . A Bayesian analysis yields a host-star mass of ∼0.3 M ⊙ , a planetary mass of ∼40 M ⊕ , a projected planet-host separation of ∼1.6 au, and a lens distance of ∼7.5 kpc. Based on the photometric precision achieved by DREAMS for this event, we simulate free-floating planet (FFP) detections and find that DREAMS is sensitive to Mars-mass FFPs in the Galactic bulge and Moon-mass FFPs in the Galactic disk.
Source: The Astronomical Journal
Authors: Hongjing 弘靖 Yang 杨, Weicheng 伟呈 Zang 臧, Yoon-Hyun Ryu, Takahiro Sumi, Jiyuan 纪元 Zhang 张, Hongyu 弘禹 Li 李, Cheongho Han, (Leading Authors), Yuchen Tang, Qiyue Qian, Zhixing Li, Yuxin Shang, Xikai Shan, Shude Mao, Guillermo Damke, Alfredo Zenteno, Steve Heathcote, Konstantina Boutsia, Przemek Mróz, Xiurui Zhao, Matthew Penny, Sean Terry, Patrick Tamburo, Timothy Cunningham, Quanzhi Ye, Eric W. Peng, Rachel Street, Katarzyna Kruszyńska, Etienne Bachelet, Yiannis Tsapras, Markus Hundertmark, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Kyu-Ha Hwang, Youn Kil Jung, In-Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Dong-Jin Kim, Chung-Uk Lee, Byeong-Gon Park, David P. Bennett, Ian A. Bond, Ryusei Hamada, Yuki Hirao, Asahi Idei, Shuma Makida, Shota Miyazaki, Tutumi Nagai, Togo Nagano, Seiya Nakayama, Mayu Nishio, Kansuke Nunota, Ryo Ogawa, Ryunosuke Oishi, Yui Okumoto, Nicholas J. Rattenbury, Yuki K. Satoh, Daisuke Suzuki, Motohide Tamura, Takuto Tamaoki, Hibiki Yama
Institutions: Korea Astronomy and Space Science Institute, The University of Osaka, Chungbuk National University, Westlake University, Tsinghua University, Cerro Tololo Inter-American Observatory, University of Warsaw, California Institute of Technology, Louisiana State University, Goddard Space Flight Center, University of Maryland, College Park, Center for Astrophysics Harvard & Smithsonian, Boston University, NSF NOIRLab, Las Cumbres Observatory Global Telescope Network, Infrared Processing and Analysis Center, University of Canterbury, Max Planck Institute for Astronomy, The Ohio State University, Korea University of Science and Technology, Weizmann Institute of Science, Massey University, The University of Tokyo, Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, University of Auckland, Kanto Gakuin University, Astrobiology Center
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
Funders: National Science Foundation, U.S. Department of Energy, University of Pennsylvania, Ohio State University, University of Portsmouth, University College London, University of Sussex, Deutsche Forschungsgemeinschaft, National Natural Science Foundation of China, China Postdoctoral Science Foundation, Ministério da Ciência, Tecnologia e Inovação, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Korea Astronomy and Space Science Institute, National Research Foundation of Korea, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Financiadora de Estudos e Projetos, Ludwig-Maximilians-Universität München, Ministry of Science and ICT, South Korea, Institut de Física d'Altes Energies, Korea Research Environment Open Network, University of Illinois at Urbana-Champaign, Smithsonian Astrophysical Observatory, Science and Technology Facilities Council, Japan Society for the Promotion of Science, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Integrated Electronics Engineering Center, Binghamton University, Argonne National Laboratory, Fermilab, Lawrence Berkeley National Laboratory, SLAC National Accelerator Laboratory
Awards: G1383328421, G288881929, G2899887924, NSF-BSF: The Frequency and Mass-Ratio Distribution of Super-Earths in KMTNet, G4029007001, G4207453364, G4691174051, G6028821114, G6503490143, Preparing for Science with the Rubin Observatory: Groundwork to Explore the Galactic Population of Exoplanets, G8411355473, G9000383870
OpenAlex ID: W7128732284