MOA-2016-BLG-227Lb: A Massive Planet Characterized by Combining Light-curve Analysis and Keck AO Imaging

N. Koshimoto; Y. Shvartzvald; D. P. Bennett; M. T. Penny; M. Hundertmark; I. A. Bond; W. C. Zang; C. B. Henderson; D. Suzuki; N. J. Rattenbury; T. Sumi; F. Abe; Y. Asakura; A. Bhattacharya; M. Donachie; P. Evans; A. Fukui; Y. Hirao; Y. Itow; M. C.A. Li; C. H. Ling; K. Masuda; Y. Matsubara; T. Matsuo; Y. Muraki; M. Nagakane; K. Ohnishi; C. Ranc; To Saito; A. Sharan; H. Shibai; D. J. Sullivan; P. J. Tristram; T. Yamada; T. Yamada; A. Yonehara; C. R. Gelino; C. Beichman; J. P. Beaulieu; J. B. Marquette; V. Batista; M. Friedmann; N. Hallakoun; S. Kaspi; D. Maoz; G. Bryden; S. Calchi Novati; S. B. Howell; T. S. Wang; S. Mao; P. Fouqué; H. Korhonen; U. G. Jørgensen; R. Street; Y. Tsapras; M. Dominik; E. Kerins; A. Cassan; C. Snodgrass; E. Bachelet; V. Bozza; D. M. Bramich

doi:10.3847/1538-3881/aa72e0

MOA-2016-BLG-227Lb: A Massive Planet Characterized by Combining Light-curve Analysis and Keck AO Imaging

N. Koshimoto, Y. Shvartzvald, D. P. Bennett, M. T. Penny, M. Hundertmark, I. A. Bond, W. C. Zang, C. B. Henderson, D. Suzuki, N. J. Rattenbury, T. Sumi, F. Abe, Y. Asakura, A. Bhattacharya, M. Donachie, P. Evans, A. Fukui, Y. Hirao, Y. Itow, M. C.A. LiC. H. Ling, K. Masuda, Y. Matsubara, T. Matsuo, Y. Muraki, M. Nagakane, K. Ohnishi, C. Ranc, To Saito, A. Sharan, H. Shibai, D. J. Sullivan, P. J. Tristram, T. Yamada, T. Yamada, A. Yonehara, C. R. Gelino, C. Beichman, J. P. Beaulieu, J. B. Marquette, V. Batista, M. Friedmann, N. Hallakoun, S. Kaspi, D. Maoz, G. Bryden, S. Calchi Novati, S. B. Howell, T. S. Wang, S. Mao, P. Fouqué, H. Korhonen, U. G. Jørgensen, R. Street, Y. Tsapras, M. Dominik, E. Kerins, A. Cassan, C. Snodgrass, E. Bachelet, V. Bozza, D. M. Bramich

School of Physics and Astronomy

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32 Scopus citations

Abstract

We report the discovery of a microlensing planet - MOA-2016-BLG-227Lb - with a large planet/host mass ratio of q ≃ 9 ×10^-3. This event was located near the K2 Campaign 9 field that was observed by a large number of telescopes. As a result, the event was in the microlensing survey area of a number of these telescopes, and this enabled good coverage of the planetary light-curve signal. High angular resolution adaptive optics images from the Keck telescope reveal excess flux at the position of the source above the flux of the source star, as indicated by the light-curve model. This excess flux could be due to the lens star, but it could also be due to a companion to the source or lens star, or even an unrelated star. We consider all these possibilities in a Bayesian analysis in the context of a standard Galactic model. Our analysis indicates that it is unlikely that a large fraction of the excess flux comes from the lens, unless solar-type stars are much more likely to host planets of this mass ratio than lower mass stars. We recommend that a method similar to the one developed in this paper be used for other events with high angular resolution follow-up observations when the follow-up observations are insufficient to measure the lens-source relative proper motion.

Original language	English
Article number	3
Journal	Astronomical Journal
Volume	154
Issue number	1
DOIs	https://doi.org/10.3847/1538-3881/aa72e0
State	Published - Jul 2017

Funding

Funders	Funder number
National Aeronautics and Space Administration	NNX16AC62G
Science and Technology Facilities Council	ST/P000649/1, ST/L004569/1
Japan Society for the Promotion of Science	17H02871, 16H05732, 15J01676, 16H06287, 17J02146
National Natural Science Foundation of China	097.C-0261, 11333003, 11390372

Keywords

gravitational lensing: micro
planetary systems

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10.3847/1538-3881/aa72e0

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Koshimoto, N., Shvartzvald, Y., Bennett, D. P., Penny, M. T., Hundertmark, M., Bond, I. A., Zang, W. C., Henderson, C. B., Suzuki, D., Rattenbury, N. J., Sumi, T., Abe, F., Asakura, Y., Bhattacharya, A., Donachie, M., Evans, P., Fukui, A., Hirao, Y., Itow, Y., ... Bramich, D. M. (2017). MOA-2016-BLG-227Lb: A Massive Planet Characterized by Combining Light-curve Analysis and Keck AO Imaging. Astronomical Journal, 154(1), Article 3. https://doi.org/10.3847/1538-3881/aa72e0

@article{a3e8123b70b94d7b9b85ea4ed8b11af0,

title = "MOA-2016-BLG-227Lb: A Massive Planet Characterized by Combining Light-curve Analysis and Keck AO Imaging",

abstract = "We report the discovery of a microlensing planet - MOA-2016-BLG-227Lb - with a large planet/host mass ratio of q ≃ 9 ×10-3. This event was located near the K2 Campaign 9 field that was observed by a large number of telescopes. As a result, the event was in the microlensing survey area of a number of these telescopes, and this enabled good coverage of the planetary light-curve signal. High angular resolution adaptive optics images from the Keck telescope reveal excess flux at the position of the source above the flux of the source star, as indicated by the light-curve model. This excess flux could be due to the lens star, but it could also be due to a companion to the source or lens star, or even an unrelated star. We consider all these possibilities in a Bayesian analysis in the context of a standard Galactic model. Our analysis indicates that it is unlikely that a large fraction of the excess flux comes from the lens, unless solar-type stars are much more likely to host planets of this mass ratio than lower mass stars. We recommend that a method similar to the one developed in this paper be used for other events with high angular resolution follow-up observations when the follow-up observations are insufficient to measure the lens-source relative proper motion.",

keywords = "gravitational lensing: micro, planetary systems",

author = "N. Koshimoto and Y. Shvartzvald and Bennett, {D. P.} and Penny, {M. T.} and M. Hundertmark and Bond, {I. A.} and Zang, {W. C.} and Henderson, {C. B.} and D. Suzuki and Rattenbury, {N. J.} and T. Sumi and F. Abe and Y. Asakura and A. Bhattacharya and M. Donachie and P. Evans and A. Fukui and Y. Hirao and Y. Itow and Li, {M. C.A.} and Ling, {C. H.} and K. Masuda and Y. Matsubara and T. Matsuo and Y. Muraki and M. Nagakane and K. Ohnishi and C. Ranc and To Saito and A. Sharan and H. Shibai and Sullivan, {D. J.} and Tristram, {P. J.} and T. Yamada and T. Yamada and A. Yonehara and Gelino, {C. R.} and C. Beichman and Beaulieu, {J. P.} and Marquette, {J. B.} and V. Batista and M. Friedmann and N. Hallakoun and S. Kaspi and D. Maoz and G. Bryden and Novati, {S. Calchi} and Howell, {S. B.} and Wang, {T. S.} and S. Mao and P. Fouqu{\'e} and H. Korhonen and J{\o}rgensen, {U. G.} and R. Street and Y. Tsapras and M. Dominik and E. Kerins and A. Cassan and C. Snodgrass and E. Bachelet and V. Bozza and Bramich, {D. M.}",

year = "2017",

month = jul,

doi = "10.3847/1538-3881/aa72e0",

language = "אנגלית",

volume = "154",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "1",

}

Koshimoto, N, Shvartzvald, Y, Bennett, DP, Penny, MT, Hundertmark, M, Bond, IA, Zang, WC, Henderson, CB, Suzuki, D, Rattenbury, NJ, Sumi, T, Abe, F, Asakura, Y, Bhattacharya, A, Donachie, M, Evans, P, Fukui, A, Hirao, Y, Itow, Y, Li, MCA, Ling, CH, Masuda, K, Matsubara, Y, Matsuo, T, Muraki, Y, Nagakane, M, Ohnishi, K, Ranc, C, Saito, T, Sharan, A, Shibai, H, Sullivan, DJ, Tristram, PJ, Yamada, T, Yamada, T, Yonehara, A, Gelino, CR, Beichman, C, Beaulieu, JP, Marquette, JB, Batista, V, Friedmann, M, Hallakoun, N, Kaspi, S, Maoz, D, Bryden, G, Novati, SC, Howell, SB, Wang, TS, Mao, S, Fouqué, P, Korhonen, H, Jørgensen, UG, Street, R, Tsapras, Y, Dominik, M, Kerins, E, Cassan, A, Snodgrass, C, Bachelet, E, Bozza, V & Bramich, DM 2017, 'MOA-2016-BLG-227Lb: A Massive Planet Characterized by Combining Light-curve Analysis and Keck AO Imaging', Astronomical Journal, vol. 154, no. 1, 3. https://doi.org/10.3847/1538-3881/aa72e0

TY - JOUR

T1 - MOA-2016-BLG-227Lb

T2 - A Massive Planet Characterized by Combining Light-curve Analysis and Keck AO Imaging

AU - Koshimoto, N.

AU - Shvartzvald, Y.

AU - Bennett, D. P.

AU - Penny, M. T.

AU - Hundertmark, M.

AU - Bond, I. A.

AU - Zang, W. C.

AU - Henderson, C. B.

AU - Suzuki, D.

AU - Rattenbury, N. J.

AU - Sumi, T.

AU - Abe, F.

AU - Asakura, Y.

AU - Bhattacharya, A.

AU - Donachie, M.

AU - Evans, P.

AU - Fukui, A.

AU - Hirao, Y.

AU - Itow, Y.

AU - Li, M. C.A.

AU - Ling, C. H.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Matsuo, T.

AU - Muraki, Y.

AU - Nagakane, M.

AU - Ohnishi, K.

AU - Ranc, C.

AU - Saito, To

AU - Sharan, A.

AU - Shibai, H.

AU - Sullivan, D. J.

AU - Tristram, P. J.

AU - Yamada, T.

AU - Yonehara, A.

AU - Gelino, C. R.

AU - Beichman, C.

AU - Beaulieu, J. P.

AU - Marquette, J. B.

AU - Batista, V.

AU - Friedmann, M.

AU - Hallakoun, N.

AU - Kaspi, S.

AU - Maoz, D.

AU - Bryden, G.

AU - Novati, S. Calchi

AU - Howell, S. B.

AU - Wang, T. S.

AU - Mao, S.

AU - Fouqué, P.

AU - Korhonen, H.

AU - Jørgensen, U. G.

AU - Street, R.

AU - Tsapras, Y.

AU - Dominik, M.

AU - Kerins, E.

AU - Cassan, A.

AU - Snodgrass, C.

AU - Bachelet, E.

AU - Bozza, V.

AU - Bramich, D. M.

PY - 2017/7

Y1 - 2017/7

N2 - We report the discovery of a microlensing planet - MOA-2016-BLG-227Lb - with a large planet/host mass ratio of q ≃ 9 ×10-3. This event was located near the K2 Campaign 9 field that was observed by a large number of telescopes. As a result, the event was in the microlensing survey area of a number of these telescopes, and this enabled good coverage of the planetary light-curve signal. High angular resolution adaptive optics images from the Keck telescope reveal excess flux at the position of the source above the flux of the source star, as indicated by the light-curve model. This excess flux could be due to the lens star, but it could also be due to a companion to the source or lens star, or even an unrelated star. We consider all these possibilities in a Bayesian analysis in the context of a standard Galactic model. Our analysis indicates that it is unlikely that a large fraction of the excess flux comes from the lens, unless solar-type stars are much more likely to host planets of this mass ratio than lower mass stars. We recommend that a method similar to the one developed in this paper be used for other events with high angular resolution follow-up observations when the follow-up observations are insufficient to measure the lens-source relative proper motion.

AB - We report the discovery of a microlensing planet - MOA-2016-BLG-227Lb - with a large planet/host mass ratio of q ≃ 9 ×10-3. This event was located near the K2 Campaign 9 field that was observed by a large number of telescopes. As a result, the event was in the microlensing survey area of a number of these telescopes, and this enabled good coverage of the planetary light-curve signal. High angular resolution adaptive optics images from the Keck telescope reveal excess flux at the position of the source above the flux of the source star, as indicated by the light-curve model. This excess flux could be due to the lens star, but it could also be due to a companion to the source or lens star, or even an unrelated star. We consider all these possibilities in a Bayesian analysis in the context of a standard Galactic model. Our analysis indicates that it is unlikely that a large fraction of the excess flux comes from the lens, unless solar-type stars are much more likely to host planets of this mass ratio than lower mass stars. We recommend that a method similar to the one developed in this paper be used for other events with high angular resolution follow-up observations when the follow-up observations are insufficient to measure the lens-source relative proper motion.

KW - gravitational lensing: micro

KW - planetary systems

UR - http://www.scopus.com/inward/record.url?scp=85024387849&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/aa72e0

DO - 10.3847/1538-3881/aa72e0

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AN - SCOPUS:85024387849

SN - 0004-6256

VL - 154

JO - Astronomical Journal

JF - Astronomical Journal

IS - 1

M1 - 3

ER -

MOA-2016-BLG-227Lb: A Massive Planet Characterized by Combining Light-curve Analysis and Keck AO Imaging

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