MOA Data Reveal a New Mass, Distance, and Relative Proper Motion for Planetary System OGLE-2015-BLG-0954L

Journal Article · Tue Aug 01 00:00:00 EDT 2017 · The Astronomical Journal (Online)

DOI:https://doi.org/10.3847/1538-3881/AA7AEE· OSTI ID:22863052

Bennett, D. P.; Barry, R.; Bhattacharya, A.; Ranc, C. ^[1]; Bond, I. A.; Ling, C. H. ^[2]; Abe, F.; Asakura, Y.; Itow, Y.; Masuda, K.; Matsubara, Y.; Muraki, Y. ^[3]; Donachie, M.; Evans, P.; Li, M. C. A. ^[4]; Fukui, A. ^[5]; Hirao, Y.; Koshimoto, N.; Nagakane, M. ^[6]; others, and

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1. Code 667, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
2. Institute of Natural and Mathematical Sciences, Massey University, Auckland 0745 (New Zealand)
3. Institute for Space-Earth Environmental Research, Nagoya University, Nagoya 464-8601 (Japan)
4. Department of Physics, University of Auckland, Private Bag 92019, Auckland (New Zealand)
5. Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, 3037-5 Honjo, Kamogata, Asakuchi, Okayama 719-0232 (Japan)
6. Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan)

We present the MOA Collaboration light-curve data for the planetary microlensing event OGLE-2015-BLG-0954, which was previously announced in a paper by the KMTNet and OGLE Collaborations. The MOA data cover the caustic exit, which was not covered by the KMTNet or Optical Gravitational Lensing Experiment (OGLE) data, and they provide a more reliable measurement of the finite source effect. The MOA data also provide a new source color measurement that reveals a lens-source relative proper motion of μ {sub rel} = 11.8 ± 0.8 mas yr{sup −1}, which compares to the value of μ {sub rel} = 18.4 ± 1.7 mas yr{sup −1} reported in the KMTNet-OGLE paper. This new MOA value for μ {sub rel} has an a priori probability that is a factor of ≳100 times larger than the previous value, and it does not require a lens system distance of D {sub L} < 1 kpc. Based on the corrected source color, we find that the lens system consists of a planet of mass 3.4{sub −1.6}{sup +3.7} M{sub Jup} orbiting a 0.30{sub −0.14}{sup +0.34} M{sub ⊙} star at an orbital separation of 2.1{sub −1.0}{sup +2.2} au and a distance of 1.2{sub −0.5}{sup +1.1} kpc.

• OSTI ID: 22863052
• Journal Information: The Astronomical Journal (Online), Vol. 154, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COLOR
COMPARATIVE EVALUATIONS
DIAGRAMS
DISTANCE
GRAVITATIONAL LENSES
MASS
PLANETS
PROBABILITY
PROPER MOTION
STARS
VISIBLE RADIATION