MOA-2010-BLG-328LB: A sub-Neptune orbiting very late M dwarf?

Furusawa, K; Udalski, A; Sumi, T; Bennett, DP; Bond, IA; Gould, A; Jorgensen, UG; Snodgrass, C; Prester, DD; Albrow, MD; Abe, F; Botzler, CS; Chote, P; Freeman, M; Fukui, A; Harris, P; Itow, Y; Ling, CH; Masuda, K; Matsubara, Y; Miyake, N; Muraki, Y; Ohnishi, K; Rattenbury, NJ; Saito, T; Sullivan, DJ; Suzuki, D; Sweatman, WL; Tristram, PJ; Wada, K; Yock, PCM; Szymanski, MK; Soszynski, I; Kubiak, M; Poleski, R; Ulaczyk, K; Pietrzynski, G; Wyrzykowski, A; Choi, J-Y; Christie, GW; DePoy, DL; Dong, S; Drummond, J; Gaudi, BS; Han, C; Hung, L-W; Hwang, K-H; Lee, C-U; McCormick, J; Moorhouse, D; Natusch, T; Nola, M; Ofek, E; Pogge, RW; Shin, I-G; Skowron, J; Thornley, G; Yee, JC; Alsubai, KA; Bozza, V; Browne, P; Burgdorf, MJ; Novati, SC; Dodds, P; Dominik, M; Finet, F; Gerner, T; Hardis, S; Harpsoe, K; Hinse, TC; Hundertmark, M; Kains, N; Kerins, E; Liebig, C; Mancini, L; Mathiasen, M; Penny, MT; Proft, S; Rahvar, S; Ricci, D; Scarpetta, G; Schafer, S; Schonebeck, F; Southworth, J; Surdej, J; Wambsganss, J; Street, RA; Bramich, DM; Steele, IA; Tsapras, Y; Horne, K; Donatowicz, J; Sahu, KC; Bachelet, E; Batista, V; Beatty, TG; Beaulieu, Jean-Philippe; Bennett, CS; Black, C; Bowens-Rubin, R; Brillant, S; Caldwell, JAR; Cassan, A; Cole, Andrew; Corrales, E; Coutures, C; Dieters, S; Fouque, P; Greenhill, J; Henderson, CB; Kubas, D; Marquette, J-B; Martin, R; Menzies, JW; Shappee, B; Williams, A; Wouters, D; van Saders, J; Zellem, R; Zub, M

MOA-2010-BLG-328LB: A sub-Neptune orbiting very late M dwarf?

journal contribution

posted on 2025-01-15, 00:59 authored by K Furusawa, A Udalski, T Sumi, DP Bennett, IA Bond, A Gould, UG Jorgensen, C Snodgrass, DD Prester, MD Albrow, F Abe, CS Botzler, P Chote, M Freeman, A Fukui, P Harris, Y Itow, CH Ling, K Masuda, Y Matsubara, N Miyake, Y Muraki, K Ohnishi, NJ Rattenbury, T Saito, DJ Sullivan, D Suzuki, WL Sweatman, PJ Tristram, K Wada, PCM Yock, MK Szymanski, I Soszynski, M Kubiak, R Poleski, K Ulaczyk, G Pietrzynski, A Wyrzykowski, J-Y Choi, GW Christie, DL DePoy, S Dong, J Drummond, BS Gaudi, C Han, L-W Hung, K-H Hwang, C-U Lee, J McCormick, D Moorhouse, T Natusch, M Nola, E Ofek, RW Pogge, I-G Shin, J Skowron, G Thornley, JC Yee, KA Alsubai, V Bozza, P Browne, MJ Burgdorf, SC Novati, P Dodds, M Dominik, F Finet, T Gerner, S Hardis, K Harpsoe, TC Hinse, M Hundertmark, N Kains, E Kerins, C Liebig, L Mancini, M Mathiasen, MT Penny, S Proft, S Rahvar, D Ricci, G Scarpetta, S Schafer, F Schonebeck, J Southworth, J Surdej, J Wambsganss, RA Street, DM Bramich, IA Steele, Y Tsapras, K Horne, J Donatowicz, KC Sahu, E Bachelet, V Batista, TG Beatty, Jean-Philippe BeaulieuJean-Philippe Beaulieu, CS Bennett, C Black, R Bowens-Rubin, S Brillant, JAR Caldwell, A Cassan, Andrew ColeAndrew Cole, E Corrales, C Coutures, S Dieters, P Fouque, J Greenhill, CB Henderson, D Kubas, J-B Marquette, R Martin, JW Menzies, B Shappee, A Williams, D Wouters, J van Saders, R Zellem, M Zub

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.

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Astrophysical Journal

Volume

779

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2

Article number

91

Number

91

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1-12

ISSN

0004-637X

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School of Natural Sciences, Physics

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IOP Publishing

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Published

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190 North Independence Mall West, Suite 601, Phil.

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280120 Expanding knowledge in the physical sciences

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MOA-2010-BLG-328LB: A sub-Neptune orbiting very late M dwarf?

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