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    OGLE-2016-BLG-1190Lb: First Spitzer Bulge Planet Lies Near the Planet/Brown-Dwarf Boundary (2017)

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    1710.09974v3.pdf (6.150Mb)
    Type of Content
    Journal Article
    UC Permalink
    http://hdl.handle.net/10092/15205
    
    Publisher's DOI/URI
    https://doi.org/10.3847/1538-3881/aa9be4
    
    Collections
    • Science: Journal Articles [1191]
    Authors
    Ryu Y-H
    Yee JC
    Udalski A
    Bond IA
    Shvartzvald Y
    Zang W
    Jaimes RF
    Jorgensen UG
    Zhu W
    Huang CX
    Jung YK
    Albrow MD
    Chung S-J
    Gould A
    Han C
    Hwang K-H
    Shin I-G
    Cha S-M
    Kim D-J
    Kim H-W
    Kim S-L
    Lee C-U
    Lee D-J
    Lee Y
    Park B-G
    Pogge RW
    Novati SC
    Carey S
    Henderson CB
    Beichman C
    Gaudi BS
    Mróz P
    Poleski R
    Skowron J
    Szymanski MK
    Soszynski I
    Kozlowski S
    Pietrukowicz P
    Ulaczyk K
    Pawlak M
    Abe F
    Asakura Y
    Barry R
    Bennett DP
    Bhattacharya A
    Donachie M
    Evans P
    Fukui A
    Hirao Y
    Itow Y
    Kawasaki K
    Koshimoto N
    Li MCA
    Ling CH
    Masuda K
    Matsubara Y
    Miyazaki S
    Muraki Y
    Nagakane M
    Ohnishi K
    Ranc C
    Rattenbury NJ
    Saito T
    Sharan A
    Sullivan DJ
    Sumi T
    Suzuki D
    Tristram PJ
    Yamada T
    Yamada T
    Yonehara A
    Bryden G
    Howell SB
    Jacklin S
    Penny MT
    Mao S
    Fouque P
    Wang T
    Street RA
    Tsapras Y
    Hundertmark M
    Bachelet E
    Dominik M
    Li Z
    Cross S
    Cassan A
    Horne K
    Schmidt R
    Wambsganss J
    Ment SK
    Maoz D
    Snodgrass C
    Steele IA
    Bozza V
    Burgdorf MJ
    Ciceri S
    D'Ago G
    Evans DF
    Hinse TC
    Kerins E
    Kokotanekova R
    Longa P
    MacKenzie J
    Popovas A
    Rabus M
    Rahvar S
    Sejadian S
    Skottfelt J
    Southworth J
    Essen CV
    show all
    Abstract

    We report the discovery of OGLE-2016-BLG-1190Lb, which is likely to be the first Spitzer microlensing planet in the Galactic bulge/bar, an assignation that can be confirmed by two epochs of high-resolution imaging of the combined source-lens baseline object. The planet's mass M_p= 13.4+-0.9 M_J places it right at the deuterium burning limit, i.e., the conventional boundary between "planets" and "brown dwarfs". Its existence raises the question of whether such objects are really "planets" (formed within the disks of their hosts) or "failed stars" (low mass objects formed by gas fragmentation). This question may ultimately be addressed by comparing disk and bulge/bar planets, which is a goal of the Spitzer microlens program. The host is a G dwarf M_host = 0.89+-0.07 M_sun and the planet has a semi-major axis a~2.0 AU. We use Kepler K2 Campaign 9 microlensing data to break the lens-mass degeneracy that generically impacts parallax solutions from Earth-Spitzer observations alone, which is the first successful application of this approach. The microlensing data, derived primarily from near-continuous, ultra-dense survey observations from OGLE, MOA, and three KMTNet telescopes, contain more orbital information than for any previous microlensing planet, but not quite enough to accurately specify the full orbit. However, these data do permit the first rigorous test of microlensing orbital-motion measurements, which are typically derived from data taken over <1% of an orbital period.

    Keywords
    astro-ph.EP; gravitational lensing: micro
    ANZSRC Fields of Research
    02 - Physical Sciences::0201 - Astronomical and Space Sciences::020102 - Astronomical and Space Instrumentation
    51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systems

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