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OGLE-2015-BLG-1649Lb: A Gas Giant Planet around a Low-mass Dwarf

Nagakane, Masayuki; Lee, Chien-Hsiu; Koshimoto, Naoki; Suzuki, Daisuke; Udalski, Andrzej; Beaulieu, Jean-Philippe; Sumi, Takahiro; Bennett, David; Bond, Ian A.; Rattenbury, Nicholas J.; Bachelet, Etienne; Dominik, Martin; Abe, Fumio; Barry, Richard; Bhattacharya, Aparna; Donachie, Martin; Fujii, H.; Fukui, Akihiko; Hirao, Yuki; Itow, Yoshitaka; Kamei, Y.; Kondo, Iona; Cheung Alex Li, Man; Matsubara, Y.; Matsuo, Taro; Miyazaki, Shota; Muraki, Yasushi; Ranc, Clément; Shibai, Hiroshi; Suematsu, Haruno; Sullivan, Denis; Tristram, P.; Yamakawa, T.; Yonehara, A.; Mróz, P.; Poleski, Radosław; Skowron, Jan; Szymański, M.; Soszyński, I.; Pietrukowicz, Pawel; Kozłowski, Szymon; Ulaczyk, Krzysztof; Bramich, Dan; Cassan, Arnaud; Jaimes, R.; Horne, K.; Hundertmark, Markus; Mao, Shude; Menzies, John; Schmidt, R.; Snodgrass, Colin; Steele, Iain; Street, Rachel; Tsapras, Yiannis; Wambsganss, Joachim; Jørgensen, Uffe; Bozza, Valerio; Longã, P.; Peixinho, Nuno; Skottfelt, Jesper; Southworth, John; Ander...

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Masayuki Nagakane

Chien-Hsiu Lee

Naoki Koshimoto

Daisuke Suzuki

Andrzej Udalski

Jean-Philippe Beaulieu

Takahiro Sumi

David Bennett

Ian A. Bond

Nicholas J. Rattenbury

Etienne Bachelet

Martin Dominik

Fumio Abe

Richard Barry

Aparna Bhattacharya

Martin Donachie

H. Fujii

Akihiko Fukui

Yuki Hirao

Yoshitaka Itow

Y. Kamei

Iona Kondo

Man Cheung Alex Li

Y. Matsubara

Taro Matsuo

Shota Miyazaki

Yasushi Muraki

Clément Ranc

Hiroshi Shibai

Haruno Suematsu

Denis Sullivan

P. Tristram

T. Yamakawa

A. Yonehara

P. Mróz

Radosław Poleski

Jan Skowron

M. Szymański

I. Soszyński

Pawel Pietrukowicz

Szymon Kozłowski

Krzysztof Ulaczyk

Dan Bramich

Arnaud Cassan

R. Jaimes

K. Horne

Markus Hundertmark

Shude Mao

John Menzies

R. Schmidt

Colin Snodgrass

Iain Steele

Rachel Street

Yiannis Tsapras

Joachim Wambsganss

Uffe Jørgensen

Valerio Bozza

P. Longã

Nuno Peixinho

Jesper Skottfelt

M.I. Andersen

M. Burgdorf

Giuseppe D'Ago

Daniel Evans

Tobias Hinse

Heidi Korhonen

Markus Rabus

Sohrab Rahvar


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 , respectively. The distance to the system is . The projected star–planet separation is . 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.

Journal Article Type Article
Acceptance Date Sep 25, 2019
Publication Date Nov 1, 2019
Journal Astronomical Journal
Print ISSN 0004-6256
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 158
Issue 5
Article Number 212
Keywords galactic bulge, camera, stars, model, host
Publisher URL