MOA-2016-BLG-319Lb: Microlensing Planet Subject to Rare Minor-image 
Perturbation Degeneracy in Determining Planet Parameters

Han, Cheongho; Bond, Ian A.; Gould, Andrew; Albrow, Michael D.; Chung, Sun-Ju; Jung, Youn Kil; Hwang, Kyu-Ha; Lee, Chung-Uk; Ryu, Yoon-Hyun; Shin, In-Gu; Shvartzvald, Yossi; Yee, Jennifer C.; Cha, Sang-Mok; Kim, Dong-Jin; Kim, Hyoun-Woo; Kim, Seung-Lee; Lee, Dong-Joo; Lee, Yongseok; Park, Byeong-Gon; Pogge, Richard W.; Kim, Chun-Hwey; Collaboration, KMTNet; Abe, Fumio; Barry, Richard; Bennett, David P.; Bhattacharya, Aparna; 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.; Sumi, Takahiro; Suzuki, Daisuke; Tristram, Paul J.; Yonehara, Atsunori; Collaboration, The MOA

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MOA-2016-BLG-319Lb: Microlensing Planet Subject to Rare Minor-image Perturbation Degeneracy in Determining Planet Parameters

MPS-Authors

Han, Cheongho
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;

Gould, Andrew
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;

Jung, Youn Kil
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;

Lee, Chung-Uk
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;

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

Shvartzvald, Yossi
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;

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, 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;

Kim, Chun-Hwey
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collaboration, KMTNet
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;

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

Bhattacharya, Aparna
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;

Sumi, Takahiro
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;

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

External Resource

https://ui.adsabs.harvard.edu/abs/2018AJ....156..226H
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Citation

Han, C., Bond, I. A., Gould, A., Albrow, M. D., Chung, S.-J., Jung, Y. K., et al. (2018). MOA-2016-BLG-319Lb: Microlensing Planet Subject to Rare Minor-image Perturbation Degeneracy in Determining Planet Parameters. The Astronomical Journal, 156.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CD78-E

Abstract

We present the analysis of the planetary microlensing event MOA-2016-BLG-319. The event light curve is characterized by a brief (̃3 days) anomaly near the peak produced by minor-image perturbations. From modeling, we find two distinct solutions that describe the observed light curve almost equally as well. From the investigation of the lens- system configurations, we find that the confusion in the lensing solution is caused by the degeneracy between the two solutions resulting from the source passages on different sides of the planetary caustic. These degeneracies can be severe for major-image perturbations, but it is known that they are considerably less severe for minor-image perturbations. From the comparison of the lens-system configuration with those of two previously discovered planetary events, for which similar degeneracies were reported, we find that the degeneracies are caused by the special source trajectories that passed the star-planet axes at approximately right angles. By conducting a Bayesian analysis, it is estimated that the lens is a planetary system in which a giant planet with a mass {M}_{{p}}={0.62}_-0.33^+1.16 {M}_{{J}} ({0.65}_-0.35^+1.21 {M}_{{J}}) is orbiting a low-mass M-dwarf host with a mass {M}_{{h}}={0.15}_-0.08^+0.28 {M}_☉. Here the planet masses in and out of the parentheses represent the masses for the individual degenerate solutions. The projected host- planet separations are a _⊥ ̃ 0.95 and ̃1.05 au for the two solutions. The identified degeneracy indicates the need to check similar degeneracies in future analyses of planetary lensing events with minor- image perturbations.