A Planetary Microlensing Event with an Unusually Red Source Star: 
MOA-2011-BLG-291

Bennett, David P.; Udalski, Andrzej; Bond, Ian A.; Suzuki, Daisuke; Ryu, Yoon-Hyun; Abe, Fumio; Barry, Richard K.; Bhattacharya, Aparna; Donachie, Martin; Fukui, Akihiko; Hirao, Yuki; Kawasaki, Kohei; Kondo, Iona; Koshimoto, Naoki; Li, Man Cheung Alex; Matsubara, Yutaka; Miyazaki, Shota; Muraki, Yasushi; Nagakane, Masayuki; Ohnishi, Koji; Ranc, Clément; Rattenbury, Nicholas J.; Suematsu, Haruno; Sumi, Takahiro; Tristram, Paul J.; Yonehara, Atsunori; Collaboration, MOA; Szymański, Michał K.; Soszyński, Igor; Wyrzykowski, Łukasz; Ulaczyk, Krzysztof; Poleski, Radek; Kozłowski, Szymon; Pietrukowicz, Paweł; Skowron, Jan; Collaboration, The OGLE; Shvartzvald, Yossi; Maoz, Dan; Kaspi, Shai; Friedmann, Matan; Group, The Wise; Batista, Virginie; DePoy, Darren; Dong, Subo; Gaudi, B. Scott; Gould, Andrew; Han, Cheongho; Pogge, Richard W.; Tan, Thiam-Guan; Yee, Jennifer C.; Collaboration, The μFUN

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A Planetary Microlensing Event with an Unusually Red Source Star: MOA-2011-BLG-291

MPS-Authors

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

Udalski, Andrzej
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;

Suzuki, Daisuke
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;

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

Barry, Richard K.
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;

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;

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

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

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

Ohnishi, Koji
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;

Sumi, Takahiro
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, MOA
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;

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

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

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

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

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

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

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

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

Shvartzvald, Yossi
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;

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

Batista, Virginie
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

DePoy, Darren
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dong, Subo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gaudi, B. Scott
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;

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

Tan, Thiam-Guan
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;

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

External Resource

https://ui.adsabs.harvard.edu/abs/2018AJ....156..113B
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Citation

Bennett, D. P., Udalski, A., Bond, I. A., Suzuki, D., Ryu, Y.-H., Abe, F., et al. (2018). A Planetary Microlensing Event with an Unusually Red Source Star: MOA-2011-BLG-291. The Astronomical Journal, 156.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CEFA-A

Abstract

We present the analysis of the planetary microlensing event MOA-2011-BLG-291, which has a mass ratio of q = (3.8 ± 0.7) × 10^-4 and a source star that is redder (or brighter) than the bulge main sequence. This event is located at a low Galactic latitude in the survey area that is currently planned for NASA’s Wide Field Infrared Survey Telescope (WFIRST) exoplanet microlensing survey. This unusual color for a microlensed source star implies that we cannot assume that the source star is in the Galactic bulge. The favored interpretation is that the source star is a lower main-sequence star at a distance of D _S = 4.9 ± 1.3 kpc in the Galactic disk. However, the source could also be a turn-off star on the far side of the bulge or a subgiant in the far side of the Galactic disk if it experiences significantly more reddening than the bulge red clump stars. However, these possibilities have only a small effect on our mass estimates for the host star and planet. We find host star and planet masses of {M}_host}={0.15}_-0.10^+0.27 {M}_☉ and {m}_p={18}_-12⁺³⁴ {M}_\oplus from a Bayesian analysis with a standard Galactic model, under the assumption that the planet hosting probability does not depend on the host mass or distance. However, if we attempt to measure the host and planet masses with host star brightness measurements from high angular resolution follow-up imaging, the implied masses will be sensitive to the host star distance. The WFIRST exoplanet microlensing survey is expected to use this method to determine the masses for many of the planetary systems that it discovers, so this issue has important design implications for the WFIRST exoplanet microlensing survey.