MOA-2010-BLG-328Lb : a sub-Neptune orbiting very Late M dwarf?

We analyze the planetary microlensing event MOA-2010-BLG-328. The best fit yields host and planetary masses of M h = 0.11 ± 0.01 M ☉ and M p = 9.2 ± 2.2 M ⊕, corresponding to a very late M dwarf and sub-Neptune-mass planet, respectively. The system lies at D L = 0.81 ± 0.10 kpc with projected separation r ⊥ = 0.92 ± 0.16 AU. Because of the host's a priori unlikely close distance, as well as the unusual nature of the system, we consider the possibility that the microlens parallax signal, which determines the host mass and distance, is actually due to xallarap (source orbital motion) that is being misinterpreted as parallax. We show a result that favors the parallax solution, even given its close host distance. We show that future high-resolution astrometric measurements could decisively resolve the remaining ambiguity of these solutions.

Citation

Furusawa , K , Udalski , A , Sumi , T , Bennett , D P , Bond , I A , Gould , A , Jørgensen , U G , Snodgrass , C , Dominis Prester , D , Albrow , M D , Abe , F , Botzler , C S , Chote , P , Freeman , M , Fukui , A , Harris , P , Itow , Y , Ling , C H , Masuda , K , Matsubara , Y , Miyake , N , Muraki , Y , Ohnishi , K , Rattenbury , N J , Saito , T , Sullivan , D J , Suzuki , D , Sweatman , W L , Tristram , P J , Wada , K , Yock , P C M , Szymański , M K , Soszyński , I , Kubiak , M , Poleski , R , Ulaczyk , K , Pietrzyński , G , Wyrzykowski , Ł , Choi , J-Y , Christie , G W , DePoy , D L , Dong , S , Drummond , J , Gaudi , B S , Han , C , Hung , L-W , Hwang , K-H , Lee , C-U , McCormick , J , Moorhouse , D , Natusch , T , Nola , M , Ofek , E , Pogge , R W , Shin , I-G , Skowron , J , Thornley , G , Yee , J C , Alsubai , K A , Bozza , V , Browne , P , Burgdorf , M J , Calchi Novati , S , Dodds , P , Dominik , M , Finet , F , Gerner , T , Hardis , S , Harpsøe , K , Hinse , T C , Hundertmark , M , Kains , N , Kerins , E , Liebig , C , Mancini , L , Mathiasen , M , Penny , M T , Proft , S , Rahvar , S , Ricci , D , Scarpetta , G , Schäfer , S , Schönebeck , F , Southworth , J , Surdej , J , Wambsganss , J , Street , R A , Bramich , D M , Steele , I A , Tsapras , Y , Horne , K , Donatowicz , J , Sahu , K C , Bachelet , E , Batista , V , Beatty , T G , Beaulieu , J-P , Bennett , C S , Black , C , Bowens-Rubin , R , Brillant , S , Caldwell , J A R , Cassan , A , Cole , A A , Corrales , E , Coutures , C , Dieters , S , Fouqué , P , Greenhill , J , Henderson , C B , Kubas , D , Marquette , J-B , Martin , R , Menzies , J W , Shappee , B , Williams , A , Wouters , D , van Saders , J , Zellem , R & Zub , M 2013 , ' MOA-2010-BLG-328Lb : a sub-Neptune orbiting very Late M dwarf? ' , Astrophysical Journal , vol. 779 , no. 2 , 91 . https://doi.org/10.1088/0004-637X/779/2/91

Publication

Astrophysical Journal

Status

Peer reviewed

DOI

https://doi.org/10.1088/0004-637X/779/2/91

ISSN

0004-637X

Type

Journal article

Rights

Description

K.A., D.M.B., M.D., K.H., M.H., C.L., C.S., R.A.S., and Y.T. are thankful to Qatar National Research Fund (QNRF), a member of the Qatar Foundation, for support by grant NPRP 09-476-1-078. K.H. is supported by a Royal Society Leverhulme Trust Senior Research Fellowship.

Collections

URI

https://hdl.handle.net/10023/5488