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WFIRST Exoplanet Mass-measurement Method Finds a Planetary Mass of 39+-8 M for OGLE-2012-BLG-0950Lb


Bhattacharya, A and Beaulieu, J-P and Bennett, DP and Anderson, J and Koshimoto, N and Lu, JR and Batista, V and Blackman, JW and Bond, IA and Fukui, A and Henderson, CB and Hirao, Y and Marquette, JB and Mroz, P and Ranc, C and Udalski, A, WFIRST Exoplanet Mass-measurement Method Finds a Planetary Mass of 39+-8 M for OGLE-2012-BLG-0950Lb, Astronomical Journal, 156, (6) Article 289. ISSN 0004-6256 (2018) [Refereed Article]

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DOI: doi:10.3847/1538-3881/aaed46


We present the analysis of the simultaneous high-resolution images from the Hubble Space Telescope and Keck adaptive optics system of the planetary event OGLE-2012-BLG-0950 that determine that the system consists of a 0.58+-0.04 MO host star orbited by a 39+-8 MO planet at a projected separation of 2.54+-0.23 au. The planetary system is located at a distance of 2.19+-0.23 kpc from Earth. This is the second microlens planet beyond the snow line with a mass measured to be in the mass range 20-80 MO. The runaway gas accretion process of the core accretion model predicts fewer planets in this mass range. This is because giant planets are thought to be growing rapidly at these masses, and they rarely complete growth at this mass. So this result suggests that the core accretion theory may need revision. This analysis also demonstrates the techniques that will be used to measure the masses of planets and their host stars by the WFIRST exoplanet microlensing survey: one-dimensional microlensing parallax combined with the separation and brightness measurement of the unresolved source and host stars to yield multiple redundant constraints on the masses and distance of the planetary system.

Item Details

Item Type:Refereed Article
Keywords:gravitational lensing; micro-planetary systems
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:Blackman, JW (Mr Joshua Blackman)
ID Code:152247
Year Published:2018
Web of Science® Times Cited:41
Deposited By:Plant Science
Deposited On:2022-08-15
Last Modified:2022-09-15

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