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

The MOA Collaboration; the OGLE Collaboration; The RoboNet Collaboration; the MiNDSTEp Collaboration

doi:10.3847/1538-3881/ab4881

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

The MOA Collaboration, the OGLE Collaboration, The RoboNet Collaboration, the MiNDSTEp Collaboration

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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 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 ML = 0.34 ± 0.19 M⊙ and Mp = 2.5+1.5
−1.4 MJup, respectively. The distance to the system is DL = 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, 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
Journal	Astronomical Journal
Volume	158
Issue number	5
DOIs	https://doi.org/10.3847/1538-3881/ab4881
Publication status	Published - 1 Nov 2019

Keywords / Materials (for Non-textual outputs)

astro-ph.EP

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10.3847/1538-3881/ab4881

1907.11536Accepted author manuscript, 1.75 MB

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@article{e8a307a5e9f94e11bc23406b6ef48a64,

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 gravitationalmicrolensing event OGLE-2015-BLG-1649 that challenges the core accretionmodel of planet formation and appears to support the disk instabilitymodel. The planet/host-star mass ratio is q = 7.2 × 10−3 and the projectedseparation normalized to the angular Einstein radius is s = 0.9. We conductedhigh-resolution follow-up observations using the IRCS camera on the Subarutelescope 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 ML = 0.34 ± 0.19 M⊙ and Mp = 2.5+1.5−1.4 MJup, respectively. The distance to the system is DL = 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, is fairly high and thus the lens can be better constrained if additional follow-up observations are conducted several years after the event.",

keywords = "astro-ph.EP",

author = "{The MOA Collaboration} and {the OGLE Collaboration} and {The RoboNet Collaboration} and {the MiNDSTEp Collaboration} and Masayuki Nagakane and Chien-Hsiu Lee and Naoki Koshimoto and Daisuke Suzuki and Andrzej Udalski and Jean-Philippe Beaulieu and Takahiro Sumi and David Bennett and Bond, {Ian A.} and Rattenbury, {Nicholas J.} and Etienne Bachelet and Martin Dominik and Fumio Abe and Richard Barry and Aparna Bhattacharya and Martin Donachie and H. Fujii and Akihiko Fukui and Yuki Hirao and Yoshitaka Itow and Y. Kamei and Iona Kondo and Li, {Man Cheung Alex} and Y. Matsubara and Taro Matsuo and Shota Miyazaki and Yasushi Muraki and Cl{\'e}ment Ranc and Hiroshi Shibai and Haruno Suematsu and Denis Sullivan and P. Tristram and T. Yamakawa and A. Yonehara and P. Mr{\'o}z and Rados{\l}aw Poleski and Jan Skowron and M. Szyma{\'n}ski and I. Soszy{\'n}ski and Pawel Pietrukowicz and Szymon Koz{\l}owski and Krzysztof Ulaczyk and Dan Bramich and Arnaud Cassan and R. Jaimes and K. Horne and Markus Hundertmark and Shude Mao and John Menzies and Colin Snodgrass",

note = "24 pages, 5 figures, 3 tables. Accepted for publication in AJ",

year = "2019",

month = nov,

day = "1",

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

language = "English",

volume = "158",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "IOP Publishing",

number = "5",

}

TY - JOUR

T1 - OGLE-2015-BLG-1649Lb

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

AU - The MOA Collaboration

AU - the OGLE Collaboration

AU - The RoboNet Collaboration

AU - the MiNDSTEp Collaboration

AU - Nagakane, Masayuki

AU - Lee, Chien-Hsiu

AU - Koshimoto, Naoki

AU - Suzuki, Daisuke

AU - Udalski, Andrzej

AU - Beaulieu, Jean-Philippe

AU - Sumi, Takahiro

AU - Bennett, David

AU - Bond, Ian A.

AU - Rattenbury, Nicholas J.

AU - Bachelet, Etienne

AU - Dominik, Martin

AU - Abe, Fumio

AU - Barry, Richard

AU - Bhattacharya, Aparna

AU - Donachie, Martin

AU - Fujii, H.

AU - Fukui, Akihiko

AU - Hirao, Yuki

AU - Itow, Yoshitaka

AU - Kamei, Y.

AU - Kondo, Iona

AU - Li, Man Cheung Alex

AU - Matsubara, Y.

AU - Matsuo, Taro

AU - Miyazaki, Shota

AU - Muraki, Yasushi

AU - Ranc, Clément

AU - Shibai, Hiroshi

AU - Suematsu, Haruno

AU - Sullivan, Denis

AU - Tristram, P.

AU - Yamakawa, T.

AU - Yonehara, A.

AU - Mróz, P.

AU - Poleski, Radosław

AU - Skowron, Jan

AU - Szymański, M.

AU - Soszyński, I.

AU - Pietrukowicz, Pawel

AU - Kozłowski, Szymon

AU - Ulaczyk, Krzysztof

AU - Bramich, Dan

AU - Cassan, Arnaud

AU - Jaimes, R.

AU - Horne, K.

AU - Hundertmark, Markus

AU - Mao, Shude

AU - Menzies, John

AU - Snodgrass, Colin

N1 - 24 pages, 5 figures, 3 tables. Accepted for publication in AJ

PY - 2019/11/1

Y1 - 2019/11/1

N2 - We report the discovery of an exoplanet from the analysis of the gravitationalmicrolensing event OGLE-2015-BLG-1649 that challenges the core accretionmodel of planet formation and appears to support the disk instabilitymodel. The planet/host-star mass ratio is q = 7.2 × 10−3 and the projectedseparation normalized to the angular Einstein radius is s = 0.9. We conductedhigh-resolution follow-up observations using the IRCS camera on the Subarutelescope 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 ML = 0.34 ± 0.19 M⊙ and Mp = 2.5+1.5−1.4 MJup, respectively. The distance to the system is DL = 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, 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 gravitationalmicrolensing event OGLE-2015-BLG-1649 that challenges the core accretionmodel of planet formation and appears to support the disk instabilitymodel. The planet/host-star mass ratio is q = 7.2 × 10−3 and the projectedseparation normalized to the angular Einstein radius is s = 0.9. We conductedhigh-resolution follow-up observations using the IRCS camera on the Subarutelescope 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 ML = 0.34 ± 0.19 M⊙ and Mp = 2.5+1.5−1.4 MJup, respectively. The distance to the system is DL = 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, is fairly high and thus the lens can be better constrained if additional follow-up observations are conducted several years after the event.

KW - astro-ph.EP

U2 - 10.3847/1538-3881/ab4881

DO - 10.3847/1538-3881/ab4881

M3 - Article

SN - 0004-6256

VL - 158

JO - Astronomical Journal

JF - Astronomical Journal

IS - 5

ER -

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

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