OGLE-2013-BLG-0911Lb : a secondary on the brown-dwarf planet boundary around an M-dwarf
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We present the analysis of the binary-lens microlensing event OGLE-2013-BLG-0911. The best-fit solutions indicate the binary mass ratio of q ≅ 0.03 which differs from that reported in Shvartzvald et al. (2016). The event suffers from the well-known close/wide degeneracy, resulting in two groups of solutions for the projected separation normalized by the Einstein radius of s ∼ 0.15 or s ∼ 7. The finite source and the parallax observations allow us to measure the lens physical parameters. The lens system is an M-dwarf orbited by a massive Jupiter companion at very close (Mhost= 0.30+0.08−0.06M⊙, Mcomp= 10.1+2.9−2.2MJup, aexp= 0.40+0.05−0.04au) or wide (Mhost = 0.28+0.10−0.08M⊙, Mcomp = 9.9+3.8−3.5MJup, aexp = 18.0+3.2−3.2au) separation. Although the mass ratio is slightly above the planet-brown dwarf (BD) mass-ratio boundary of q= 0.03 which is generally used, the median physical mass of the companion is slightly below the planet-BD mass boundary of 13MJup. It is likely that the formation mechanisms for BDs and planets are different and the objects near the boundaries could have been formed by either mechanism. It is important to probe the distribution of such companions with masses of ∼13MJup in order to statistically constrain the formation theories for both BDs and massive planets. In particular, the microlensing method is able to probe the distribution around low-mass M-dwarfs and even BDs which is challenging for other exoplanet detection methods.
Miyazaki , S , Sumi , T , Bennett , D P , Udalski , A , Shvartzvald , Y , Street , R , Bozza , V , Yee , J C , Bond , I A , Rattenbury , N , Koshimoto , N , Suzuki , D , Fukui , A , Abe , F , Bhattacharya , A , Barry , R , Donachie , M , Fujii , H , Hirao , Y , Itow , Y , Kamei , Y , Kondo , I , Li , M C A , Ling , C H , Matsubara , Y , Matsuo , T , Muraki , Y , Nagakane , M , Ohnishi , K , Ranc , C , Saito , T , Sharan , A , Shibai , H , Suematsu , H , Sullivan , D J , Tristram , P J , Yamakawa , T , Yonehara , A , Skowron , J , Poleski , R , Mróz , P , Szymański , M K , Soszyński , I , Pietrukowicz , P , KozŁowski , S , Ulaczyk , K , Wyrzykowski , L , Friedmann , M , Kaspi , S , Maoz , D , Albrow , M , Christie , G , DePoy , D L , Gal-Yam , A , Gould , A , Lee , C -U , Manulis , I , McCormick , J , Natusch , T , Ngan , H , Pogge , R W , Porritt , I , Tsapras , Y , Bachelet , E , Hundertmark , M P G , Dominik , M , Bramich , D M , Cassan , A , Jaimes , R F , Horne , K , Schmidt , R , Snodgrass , C , Wambsganss , J , Steele , I A , Menzies , J , Mao , S , Jørgensen , U G , Burgdorf , M J , Ciceri , S , Novati , S C , D'Ago , G , Evans , D F , Hinse , T C , Kains , N , Kerins , E , Korhonen , H , Mancini , L , Popovas , A , Rabus , M , Rahvar , S , Scarpetta , G , Skottfelt , J , Southworth , J , D'Ago , G , Peixinho , N & Verma , P 2020 , ' OGLE-2013-BLG-0911Lb : a secondary on the brown-dwarf planet boundary around an M-dwarf ' , Astronomical Journal , vol. 159 , no. 2 , 76 . https://doi.org/10.3847/1538-3881/ab64de
Copyright © 2020 American Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.3847/1538-3881/ab64de
DescriptionFunding: UK STFC grant ST/R000824/1 (KH).
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