File(s) under permanent embargo
MOA-2009-BLG-387Lb: a massive planet orbiting an M dwarf
journal contribution
posted on 2023-05-17, 06:06 authored by Batista, V, Gould, A, Dieters, S, Dong, S, Bond, I, Jean-Philippe BeaulieuJean-Philippe Beaulieu, Maoz, D, Monard, B, Christie, GW, McCormick, J, Albrow, MD, Horne, K, Tsapras, Y, Burgdorf, MJ, Calchi Novati, S, Skottfelt, J, Caldwell, J, Kozlowski, S, Kubas, D, Gaudi, BS, Han, C, Bennett, DP, An, J, Abe, F, Botzler, CS, Douchin, D, Freeman, M, Fukui, A, Furusawa, K, Hearnshaw, JB, Hosaka, S, Itow, Y, Kamiya, K, Kilmartin, PM, Korpela, A, Lin, W, Ling, CH, Makita, S, Masuda, K, Matsubara, Y, Miyake, N, Muraki, Y, Nagaya, M, Nishimoto, K, Ohnishi, K, Okumura, T, Perrott, YC, Rattenbury, N, Saito, To, Sullivan, DJ, Sumi, T, Sweatman, WL, Tristram, PJ, von Seggern, E, Yock, PCM, Brillant, S, Calitz, JJ, Cassan, A, Andrew ColeAndrew Cole, Cook, K, Coutures, C, Dominis Prester, D, Donatowicz, J, Greenhill, J, Hoffman, M, Jablonski, F, Kane, SR, Kains, N, Marquette, JB, Martin, R, Martioli, E, Meintjes, P, Menzies, J, Pedretti, E, Pollard, K, Sahu, KC, Vinter, C, Wambsganss, J, Watson, R, Williams, A, Zub, M, Allen, W, Bolt, G, Bos, M, DePoy, DL, Drummond, J, Eastman, JD, Gal-Yam, A, Gorbikov, E, Higgins, D, Janczak, J, Kaspi, S, Lee, CU, Mallia, F, Maury, A, Monard, LAG, Moorhouse, D, Morgan, N, Natusch, T, Ofek, EO, Park, BG, Pogge, RW, Polishook, D, Santallo, R, Shporer, A, Spector, O, Thornley, G, Yee, JC, Bozza, V, Browne, P, Dominik, M, Dreizler, S, Finet, F, Glitrup, M, Grundahl, F, Harpsoe, K, Hessman, FV, Hinse, TC, Hundertmark, M, Jorgensen, UG, Liebig, C, Maier, G, Mancini, L, Mathiasen, M, Rahvar, S, Ricci, D, Scarpetta, G, Southworth, J, Surdej, J, Zimmer, F, Allan, A, Bramich, DM, Snodgrass, C, Steele, IA, Street, RAAims. We report the discovery of a planet with a high planet-to-star mass ratio in the microlensing event MOA-2009-BLG-387, which exhibited pronounced deviations over a 12-day interval, one of the longest for any planetary event. The host is an M dwarf, with a mass in the range 0.07 MN < Mhost < 0.49 MN at 90% confidence. The planet-star mass ratio q = 0.0132 0.003 has been measured extremely well, so at the best-estimated host mass, the planet mass is mp = 2.6 Jupiter masses for the median host mass, M = 0.19 MN. Methods. The host mass is determined from two higher order +- microlensing parameters. One of these, the angular Einstein radius E = 0.31 0.03mas has been accurately measured, but the other (the microlens parallax -E, which is due to the Earths orbital motion) is highly degenerate with the orbital motion of the planet. We statistically resolve the degeneracy between Earth and planet orbital effects by imposing priors from a Galactic model that specifies the positions and velocities of lenses and sources and a Kepler model of orbits. Results. The 90% confidence intervals for the distance, semi-major axis, and period of the planet are 3.5 kpc < DL < 7.9 kpc, 1.1AU < a < 2.7AU, and 3.8 yr < P < 7.6 yr, respectively.
History
Publication title
Astronomy and Astrophysics: A European JournalVolume
529Article number
A102Number
A102Pagination
1-16ISSN
0004-6361Department/School
School of Natural SciencesPublisher
EDP SciencesPlace of publication
7, Ave Du Hoggar, Parc D Activites Courtaboeuf, Bp 112, Les Ulis Cedexa, France, F-91944Rights statement
Copyright © EDP Sciences, 2011Repository Status
- Restricted
