Two new free-floating or wide-orbit planets from microlensing

Collaboration, OGLE; Mróz, Przemek; Udalski, Andrzej; Bennett, David P.; Ryu, Yoon-Hyun; Sumi, Takahiro; Shvartzvald, Yossi; Skowron, Jan; Poleski, Radosław; Pietrukowicz, Paweł; Kozłowski, Szymon; Szymański, Michał K.; Wyrzykowski, Łukasz; Soszyński, Igor; Ulaczyk, Krzysztof; Rybicki, Krzysztof; Iwanek, Patryk; Collaboration, KMTNet; Albrow, Michael D.; Chung, Sun-Ju; Gould, Andrew; Han, Cheongho; Hwang, Kyu-Ha; Jung, Youn Kil; Shin, In-Gu; Yee, Jennifer C.; Zang, Weicheng; Cha, Sang-Mok; Kim, Dong-Jin; Kim, Hyoun-Woo; Kim, Seung-Lee; Lee, Chung-Uk; Lee, Dong-Joo; Lee, Yongseok; Park, Byeong-Gon; Pogge, Richard W.; Collaboration, MOA; Abe, Fumio; Barry, Richard; Bhattacharya, Aparna; Bond, Ian A.; Donachie, Martin; Fukui, Akihiko; Hirao, Yuki; Itow, Yoshitaka; Kawasaki, Kohei; Kondo, Iona; Koshimoto, Naoki; Li, Man Cheung Alex; Matsubara, Yutaka; Muraki, Yasushi; Miyazaki, Shota; Nagakane, Masayuki; Ranc, Clément; Rattenbury, Nicholas J.; Suematsu, Haruno; Sullivan, Denis J.; Suzuki, Daisuke; Tristram, Paul J.; Yonehara, Atsunori; Group, WISE; Maoz, Dan; Kaspi, Shai; Friedmann, Matan

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Two new free-floating or wide-orbit planets from microlensing

MPS-Authors

Collaboration, OGLE
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mróz, Przemek
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Udalski, Andrzej
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bennett, David P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ryu, Yoon-Hyun
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sumi, Takahiro
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shvartzvald, Yossi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Skowron, Jan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Poleski, Radosław
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pietrukowicz, Paweł
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kozłowski, Szymon
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Szymański, Michał K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wyrzykowski, Łukasz
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Soszyński, Igor
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ulaczyk, Krzysztof
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rybicki, Krzysztof
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Iwanek, Patryk
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collaboration, KMTNet
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Albrow, Michael D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chung, Sun-Ju
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gould, Andrew
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Han, Cheongho
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hwang, Kyu-Ha
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jung, Youn Kil
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shin, In-Gu
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yee, Jennifer C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zang, Weicheng
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cha, Sang-Mok
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim, Dong-Jin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim, Hyoun-Woo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim, Seung-Lee
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee, Chung-Uk
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee, Dong-Joo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee, Yongseok
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Park, Byeong-Gon
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pogge, Richard W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collaboration, MOA
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Abe, Fumio
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Barry, Richard
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bhattacharya, Aparna
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bond, Ian A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Donachie, Martin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fukui, Akihiko
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hirao, Yuki
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Itow, Yoshitaka
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kawasaki, Kohei
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kondo, Iona
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Koshimoto, Naoki
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Li, Man Cheung Alex
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Matsubara, Yutaka
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Muraki, Yasushi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Miyazaki, Shota
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nagakane, Masayuki
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ranc, Clément
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rattenbury, Nicholas J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Suematsu, Haruno
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sullivan, Denis J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Suzuki, Daisuke
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tristram, Paul J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yonehara, Atsunori
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Group, WISE
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Maoz, Dan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kaspi, Shai
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Friedmann, Matan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019A&A...622A.201O
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Citation

Collaboration, O., Mróz, P., Udalski, A., Bennett, D. P., Ryu, Y.-H., Sumi, T., et al. (2019). Two new free-floating or wide-orbit planets from microlensing. Astronomy and Astrophysics, 622.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D3CD-6

Abstract

Planet formation theories predict the existence of free-floating planets that have been ejected from their parent systems. Although they emit little or no light, they can be detected during gravitational microlensing events. Microlensing events caused by rogue planets are characterized by very short timescales t_E (typically below two days) and small angular Einstein radii Œ∏_E (up to several Œºas). Here we present the discovery and characterization of two ultra- short microlensing events identified in data from the Optical Gravitational Lensing Experiment (OGLE) survey, which may have been caused by free-floating or wide-orbit planets. OGLE-2012-BLG-1323 is one of the shortest events discovered thus far (t_E = 0.155 ¬± 0.005 d, Œ∏_E = 2.37 ¬± 0.10Œºas) and was caused by an Earth-mass object in the Galactic disk or a Neptune-mass planet in the Galactic bulge. OGLE-2017-BLG-0560 (t_E = 0.905 ¬± 0.005 d, Œ∏_E = 38.7 ¬± 1.6Œºas) was caused by a Jupiter-mass planet in the Galactic disk or a brown dwarf in the bulge. We rule out stellar companions up to a distance of 6.0 and 3.9 au, respectively. We suggest that the lensing objects, whether located on very wide orbits or free- floating, may originate from the same physical mechanism. Although the sample of ultrashort microlensing events is small, these detections are consistent with low-mass wide-orbit or unbound planets being more common than stars in the Milky Way.