OGLE-2015-BLG-1649Lb: a gas giant planet around a low-mass dwarf

M. Nagakane; Chien-Hsiu Lee; N. Koshimoto; D. Suzuki; A. Udalski; J. P. Beaulieu; T. Sumi; D. P. Bennett; I. A. Bond; N. Rattenbury; E. Bachelet; M. Dominik; F. Abe; R. K. Barry; A. Bhattacharya; M. Donachie; H. Fujii; A. Fukui; Y. Hirao; Y. Itow; Y. Kamei; I. Kondo; M. C. A. Li; Y. Matsubara; T. Matsuo; S. Miyazaki; Y. Muraki; C. Ranc; H. Shibai; H. Suematsu; D. J. Sullivan; P. J. Tristram; T. Yamakawa; A. Yonehara; P. Mróz; R. Poleski; J. Skowron; M. K. Szymański; I. Soszyński; P. Pietrukowicz; S. Kozłowski; K. Ulaczyk; D. M. Bramich; A. Cassan; Roberto Jose Figuera Jaimes; K. Horne; M. Hundertmark; S. Mao; J. Menzies; R. Schmidt; C. Snodgrass; I. A. Steele; R. Street; Y. Tsapras; J. Wambsganss; U. G. Jørgensen; V. Bozza; P. Longã; N. Peixinho; J. Skottfelt; J. Southworth; M. I. Andersen; M. J. Burgdorf; G. D'Ago; D. F. Evans; T. C. Hinse; H. Korhonen; M. Rabus; S. Rahvar

doi:10.3847/1538-3881/ab4881

OGLE-2015-BLG-1649Lb: a gas giant planet around a low-mass dwarf

M. Nagakane, Chien-Hsiu Lee, N. Koshimoto, D. Suzuki, A. Udalski, J. P. Beaulieu, T. Sumi, D. P. Bennett, I. A. Bond, N. Rattenbury, E. Bachelet, M. Dominik, F. Abe, R. K. Barry, A. Bhattacharya, M. Donachie, H. Fujii, A. Fukui, Y. Hirao, Y. ItowY. Kamei, I. Kondo, M. C. A. Li, Y. Matsubara, T. Matsuo, S. Miyazaki, Y. Muraki, C. Ranc, H. Shibai, H. Suematsu, D. J. Sullivan, P. J. Tristram, T. Yamakawa, A. Yonehara, P. Mróz, R. Poleski, J. Skowron, M. K. Szymański, I. Soszyński, P. Pietrukowicz, S. Kozłowski, K. Ulaczyk, D. M. Bramich, A. Cassan, Roberto Jose Figuera Jaimes, K. Horne, M. Hundertmark, S. Mao, J. Menzies, R. Schmidt, C. Snodgrass, I. A. Steele, R. Street, Y. Tsapras, J. Wambsganss, U. G. Jørgensen, V. Bozza, P. Longã, N. Peixinho, J. Skottfelt, J. Southworth, M. I. Andersen, M. J. Burgdorf, G. D'Ago, D. F. Evans, T. C. Hinse, H. Korhonen, M. Rabus, S. Rahvar

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Abstract

We report the discovery of an exoplanet from the analysis of the gravitational microlensing event OGLE-2015-BLG-1649 that challenges the core accretion model of planet formation and appears to support the disk instability model. The planet/host-star mass ratio is q = 7.2 × 10⁻³ and the projected separation normalized to the angular Einstein radius is s = 0.9. We conducted high-resolution follow-up observations using the Infrared Camera and Spectrograph (IRCS) camera on the Subaru telescope and are able to place an upper limit on the lens flux. From these measurements we are able to exclude all host stars greater than or equal in mass to a G-type dwarf. We conducted a Bayesian analysis with these new flux constraints included as priors resulting in estimates of the masses of the host star and planet. These are M _L = 0.34 ± 0.19 M ⊙ and M _p =2.5^+1.5 _-1.4 M _jup, respectively. The distance to the system is D L = 4.23 ^+1.51_-1.64 kpc. The projected star–planet separation is a _⊥ = 2.07^+0.65_-0.77 au. The estimated relative lens-source proper motion, ~7.1 mas yr⁻¹, is fairly high and thus the lens can be better constrained if additional follow-up observations are conducted several years after the event.

Original language	English
Article number	212
Pages (from-to)	1-9
Number of pages	9
Journal	Astronomical Journal
Volume	158
Issue number	5
DOIs	https://doi.org/10.3847/1538-3881/ab4881
Publication status	Published - 1 Nov 2019

Keywords

Gravitational microlensing
Exoplanet astronomy

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10.3847/1538-3881/ab4881

1907.11536
Copyright © 2019 American Astronomical Society. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.3847/1538-3881/ab4881
Accepted author manuscript, 1.74 MB

http://adsabs.harvard.edu/abs/2019arXiv190711536N

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Nagakane, M., Lee, C.-H., Koshimoto, N., Suzuki, D., Udalski, A., Beaulieu, J. P., Sumi, T., Bennett, D. P., Bond, I. A., Rattenbury, N., Bachelet, E., Dominik, M., Abe, F., Barry, R. K., Bhattacharya, A., Donachie, M., Fujii, H., Fukui, A., Hirao, Y., ... Rahvar, S. (2019). OGLE-2015-BLG-1649Lb: a gas giant planet around a low-mass dwarf. Astronomical Journal, 158(5), 1-9. Article 212. https://doi.org/10.3847/1538-3881/ab4881

@article{2f032a1b43b84ae8b1be1dff1fe14e5d,

title = "OGLE-2015-BLG-1649Lb: a gas giant planet around a low-mass dwarf",

abstract = "We report the discovery of an exoplanet from the analysis of the gravitational microlensing event OGLE-2015-BLG-1649 that challenges the core accretion model of planet formation and appears to support the disk instability model. The planet/host-star mass ratio is q = 7.2 × 10−3 and the projected separation normalized to the angular Einstein radius is s = 0.9. We conducted high-resolution follow-up observations using the Infrared Camera and Spectrograph (IRCS) camera on the Subaru telescope and are able to place an upper limit on the lens flux. From these measurements we are able to exclude all host stars greater than or equal in mass to a G-type dwarf. We conducted a Bayesian analysis with these new flux constraints included as priors resulting in estimates of the masses of the host star and planet. These are M L = 0.34 ± 0.19 M ⊙ and M p =2.5+1.5 -1.4 M jup, respectively. The distance to the system is D L = 4.23 +1.51-1.64 kpc. The projected star–planet separation is a ⊥ = 2.07+0.65-0.77 au. The estimated relative lens-source proper motion, ~7.1 mas yr−1, is fairly high and thus the lens can be better constrained if additional follow-up observations are conducted several years after the event.",

keywords = "Gravitational microlensing, Exoplanet astronomy",

author = "M. Nagakane and Chien-Hsiu Lee and N. Koshimoto and D. Suzuki and A. Udalski and Beaulieu, {J. P.} and T. Sumi and Bennett, {D. P.} and Bond, {I. A.} and N. Rattenbury and E. Bachelet and M. Dominik and F. Abe and Barry, {R. K.} and A. Bhattacharya and M. Donachie and H. Fujii and A. Fukui and Y. Hirao and Y. Itow and Y. Kamei and I. Kondo and Li, {M. C. A.} and Y. Matsubara and T. Matsuo and S. Miyazaki and Y. Muraki and C. Ranc and H. Shibai and H. Suematsu and Sullivan, {D. J.} and Tristram, {P. J.} and T. Yamakawa and A. Yonehara and P. Mr{\'o}z and R. Poleski and J. Skowron and Szyma{\'n}ski, {M. K.} and I. Soszy{\'n}ski and P. Pietrukowicz and S. Koz{\l}owski and K. Ulaczyk and Bramich, {D. M.} and A. Cassan and {Figuera Jaimes}, {Roberto Jose} and K. Horne and M. Hundertmark and S. Mao and J. Menzies and R. Schmidt and C. Snodgrass and Steele, {I. A.} and R. Street and Y. Tsapras and J. Wambsganss and J{\o}rgensen, {U. G.} and V. Bozza and P. Long{\~a} and N. Peixinho and J. Skottfelt and J. Southworth and Andersen, {M. I.} and Burgdorf, {M. J.} and G. D'Ago and Evans, {D. F.} and Hinse, {T. C.} and H. Korhonen and M. Rabus and S. Rahvar",

year = "2019",

month = nov,

day = "1",

doi = "10.3847/1538-3881/ab4881",

language = "English",

volume = "158",

pages = "1--9",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "5",

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Nagakane, M, Lee, C-H, Koshimoto, N, Suzuki, D, Udalski, A, Beaulieu, JP, Sumi, T, Bennett, DP, Bond, IA, Rattenbury, N, Bachelet, E, Dominik, M, Abe, F, Barry, RK, Bhattacharya, A, Donachie, M, Fujii, H, Fukui, A, Hirao, Y, Itow, Y, Kamei, Y, Kondo, I, Li, MCA, Matsubara, Y, Matsuo, T, Miyazaki, S, Muraki, Y, Ranc, C, Shibai, H, Suematsu, H, Sullivan, DJ, Tristram, PJ, Yamakawa, T, Yonehara, A, Mróz, P, Poleski, R, Skowron, J, Szymański, MK, Soszyński, I, Pietrukowicz, P, Kozłowski, S, Ulaczyk, K, Bramich, DM, Cassan, A, Figuera Jaimes, RJ, Horne, K, Hundertmark, M, Mao, S, Menzies, J, Schmidt, R, Snodgrass, C, Steele, IA, Street, R, Tsapras, Y, Wambsganss, J, Jørgensen, UG, Bozza, V, Longã, P, Peixinho, N, Skottfelt, J, Southworth, J, Andersen, MI, Burgdorf, MJ, D'Ago, G, Evans, DF, Hinse, TC, Korhonen, H, Rabus, M & Rahvar, S 2019, 'OGLE-2015-BLG-1649Lb: a gas giant planet around a low-mass dwarf', Astronomical Journal, vol. 158, no. 5, 212, pp. 1-9. https://doi.org/10.3847/1538-3881/ab4881

TY - JOUR

T1 - OGLE-2015-BLG-1649Lb

T2 - a gas giant planet around a low-mass dwarf

AU - Nagakane, M.

AU - Lee, Chien-Hsiu

AU - Koshimoto, N.

AU - Suzuki, D.

AU - Udalski, A.

AU - Beaulieu, J. P.

AU - Sumi, T.

AU - Bennett, D. P.

AU - Bond, I. A.

AU - Rattenbury, N.

AU - Bachelet, E.

AU - Dominik, M.

AU - Abe, F.

AU - Barry, R. K.

AU - Bhattacharya, A.

AU - Donachie, M.

AU - Fujii, H.

AU - Fukui, A.

AU - Hirao, Y.

AU - Itow, Y.

AU - Kamei, Y.

AU - Kondo, I.

AU - Li, M. C. A.

AU - Matsubara, Y.

AU - Matsuo, T.

AU - Miyazaki, S.

AU - Muraki, Y.

AU - Ranc, C.

AU - Shibai, H.

AU - Suematsu, H.

AU - Sullivan, D. J.

AU - Tristram, P. J.

AU - Yamakawa, T.

AU - Yonehara, A.

AU - Mróz, P.

AU - Poleski, R.

AU - Skowron, J.

AU - Szymański, M. K.

AU - Soszyński, I.

AU - Pietrukowicz, P.

AU - Kozłowski, S.

AU - Ulaczyk, K.

AU - Bramich, D. M.

AU - Cassan, A.

AU - Figuera Jaimes, Roberto Jose

AU - Horne, K.

AU - Hundertmark, M.

AU - Mao, S.

AU - Menzies, J.

AU - Schmidt, R.

AU - Snodgrass, C.

AU - Steele, I. A.

AU - Street, R.

AU - Tsapras, Y.

AU - Wambsganss, J.

AU - Jørgensen, U. G.

AU - Bozza, V.

AU - Longã, P.

AU - Peixinho, N.

AU - Skottfelt, J.

AU - Southworth, J.

AU - Andersen, M. I.

AU - Burgdorf, M. J.

AU - D'Ago, G.

AU - Evans, D. F.

AU - Hinse, T. C.

AU - Korhonen, H.

AU - Rabus, M.

AU - Rahvar, S.

PY - 2019/11/1

Y1 - 2019/11/1

N2 - We report the discovery of an exoplanet from the analysis of the gravitational microlensing event OGLE-2015-BLG-1649 that challenges the core accretion model of planet formation and appears to support the disk instability model. The planet/host-star mass ratio is q = 7.2 × 10−3 and the projected separation normalized to the angular Einstein radius is s = 0.9. We conducted high-resolution follow-up observations using the Infrared Camera and Spectrograph (IRCS) camera on the Subaru telescope and are able to place an upper limit on the lens flux. From these measurements we are able to exclude all host stars greater than or equal in mass to a G-type dwarf. We conducted a Bayesian analysis with these new flux constraints included as priors resulting in estimates of the masses of the host star and planet. These are M L = 0.34 ± 0.19 M ⊙ and M p =2.5+1.5 -1.4 M jup, respectively. The distance to the system is D L = 4.23 +1.51-1.64 kpc. The projected star–planet separation is a ⊥ = 2.07+0.65-0.77 au. The estimated relative lens-source proper motion, ~7.1 mas yr−1, is fairly high and thus the lens can be better constrained if additional follow-up observations are conducted several years after the event.

AB - We report the discovery of an exoplanet from the analysis of the gravitational microlensing event OGLE-2015-BLG-1649 that challenges the core accretion model of planet formation and appears to support the disk instability model. The planet/host-star mass ratio is q = 7.2 × 10−3 and the projected separation normalized to the angular Einstein radius is s = 0.9. We conducted high-resolution follow-up observations using the Infrared Camera and Spectrograph (IRCS) camera on the Subaru telescope and are able to place an upper limit on the lens flux. From these measurements we are able to exclude all host stars greater than or equal in mass to a G-type dwarf. We conducted a Bayesian analysis with these new flux constraints included as priors resulting in estimates of the masses of the host star and planet. These are M L = 0.34 ± 0.19 M ⊙ and M p =2.5+1.5 -1.4 M jup, respectively. The distance to the system is D L = 4.23 +1.51-1.64 kpc. The projected star–planet separation is a ⊥ = 2.07+0.65-0.77 au. The estimated relative lens-source proper motion, ~7.1 mas yr−1, is fairly high and thus the lens can be better constrained if additional follow-up observations are conducted several years after the event.

KW - Gravitational microlensing

KW - Exoplanet astronomy

U2 - 10.3847/1538-3881/ab4881

DO - 10.3847/1538-3881/ab4881

M3 - Article

SN - 0004-6256

VL - 158

SP - 1

EP - 9

JO - Astronomical Journal

JF - Astronomical Journal

IS - 5

M1 - 212

ER -

OGLE-2015-BLG-1649Lb: a gas giant planet around a low-mass dwarf

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