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Revisiting the microlensing event Ogle 2012-Blg-0026: a solar mass star with two cold giant planets
Citation
Beaulieu, J-P and Bennett, DP and Batista, V and Fukui, A and Marquette, J-B and Brillant, S and Cole, AA and Rogers, LA and Sumi, T and Abe, F and Bhattacharya, A and Koshimoto, N and Suzuki, D and Tristram, PJ and Han, C and Gould, A and Pogge, R and Yee, J, Revisiting the microlensing event Ogle 2012-Blg-0026: a solar mass star with two cold giant planets, Astrophysical Journal, 824, (2) Article 83. ISSN 0004-637X (2016) [Refereed Article]
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Copyright Statement
© 2016. The American Astronomical Society
DOI: doi:10.3847/0004-637X/824/2/83
Abstract
Two cold gas giant planets orbiting a G-type main-sequence star in the galactic disk were previously discovered in the high-magnification microlensing event OGLE-2012-BLG-0026. Here, we present revised host star flux measurements and a refined model for the two-planet system using additional light curve data. We performed high angular resolution adaptive optics imaging with the Keck and Subaru telescopes at two epochs while the source star was still amplified. We detected the lens flux, H = 16.39 ± 0.08. The lens, a disk star, is brighter than predicted from the modeling in the original study. We revisited the light curve modeling using additional photometric data from the B&C telescope in New Zealand and CTIO 1.3 m H-band light curve. We then include the Keck and Subaru adaptive optic observation constraints. The system is composed of a ~4–9 Gyr lens star of Mlens = 1.06 ± 0.05 M⊙ at a distance of Dlens = 4.0 ± 0.3 kpc, orbited by two giant planets of 0.145 ± 0.008 MJup and 0.86 ± 0.06 MJup, with projected separations of 4.0 ± 0.5 au and 4.8 ± 0.7 au, respectively. Because the lens is brighter than the source star by 16 ± 8% in H, with no other blend within one arcsec, it will be possible to estimate its metallicity using subsequent IR spectroscopy with 8–10 m class telescopes. By adding a constraint on the metallicity it will be possible to refine the age of the system.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | gravitational lensing: micro, planets and satellites: detection, planets and satellites: gaseous planets |
| Research Division: | Physical Sciences |
| Research Group: | Astronomical sciences |
| Research Field: | Stellar astronomy and planetary systems |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding knowledge |
| Objective Field: | Expanding knowledge in the physical sciences |
| UTAS Author: | Beaulieu, J-P (Dr Jean-Philippe Beaulieu) |
| UTAS Author: | Cole, AA (Associate Professor Andrew Cole) |
| ID Code: | 112822 |
| Year Published: | 2016 |
| Web of Science® Times Cited: | 26 |
| Deposited By: | Mathematics and Physics |
| Deposited On: | 2016-11-30 |
| Last Modified: | 2017-11-01 |
| Downloads: | 130 View Download Statistics |
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