eCite Digital Repository

MOA-2009-BLG-387Lb: a massive planet orbiting an M dwarf


Batista, V and Gould, A and Dieters, S and Dong, S and Bond, I and Beaulieu, JP and Maoz, D and Monard, B and Christie, GW and McCormick, J and Albrow, MD and Horne, K and Tsapras, Y and Burgdorf, MJ and Calchi Novati, S and Skottfelt, J and Caldwell, J and Kozlowski, S and Kubas, D and Gaudi, BS and Han, C and Bennett, DP and An, J and Abe, F and Botzler, CS and Douchin, D and Freeman, M and Fukui, A and Furusawa, K and Hearnshaw, JB and Hosaka, S and Itow, Y and Kamiya, K and Kilmartin, PM and Korpela, A and Lin, W and Ling, CH and Makita, S and Masuda, K and Matsubara, Y and Miyake, N and Muraki, Y and Nagaya, M and Nishimoto, K and Ohnishi, K and Okumura, T and Perrott, YC and Rattenbury, N and Saito, To and Sullivan, DJ and Sumi, T and Sweatman, WL and Tristram, PJ and von Seggern, E and Yock, PCM and Brillant, S and Calitz, JJ and Cassan, A and Cole, A and Cook, K and Coutures, C and Dominis Prester, D and Donatowicz, J and Greenhill, J and Hoffman, M and Jablonski, F and Kane, SR and Kains, N and Marquette, JB and Martin, R and Martioli, E and Meintjes, P and Menzies, J and Pedretti, E and Pollard, K and Sahu, KC and Vinter, C and Wambsganss, J and Watson, R and Williams, A and Zub, M and Allen, W and Bolt, G and Bos, M and DePoy, DL and Drummond, J and Eastman, JD and Gal-Yam, A and Gorbikov, E and Higgins, D and Janczak, J and Kaspi, S and Lee, CU and Mallia, F and Maury, A and Monard, LAG and Moorhouse, D and Morgan, N and Natusch, T and Ofek, EO and Park, BG and Pogge, RW and Polishook, D and Santallo, R and Shporer, A and Spector, O and Thornley, G and Yee, JC and Bozza, V and Browne, P and Dominik, M and Dreizler, S and Finet, F and Glitrup, M and Grundahl, F and Harpsoe, K and Hessman, FV and Hinse, TC and Hundertmark, M and Jorgensen, UG and Liebig, C and Maier, G and Mancini, L and Mathiasen, M and Rahvar, S and Ricci, D and Scarpetta, G and Southworth, J and Surdej, J and Zimmer, F and Allan, A and Bramich, DM and Snodgrass, C and Steele, IA and Street, RA, MOA-2009-BLG-387Lb: a massive planet orbiting an M dwarf, Astronomy and Astrophysics: A European Journal, 529 Article A102. ISSN 0004-6361 (2011) [Refereed Article]

Restricted - Request a copy

Copyright Statement

Copyright EDP Sciences, 2011

DOI: doi:10.1051/0004-6361/201016111


Aims. 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.

Item Details

Item Type:Refereed Article
Keywords:Galactic bulge; microlensing event; jupiter/saturn;analog; giant planets; snow line; stars; masses; photometry; cool luminosity
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Beaulieu, JP (Dr Jean-Philippe Beaulieu)
UTAS Author:Cole, A (Professor Andrew Cole)
UTAS Author:Greenhill, J (Dr John Greenhill)
ID Code:69621
Year Published:2011
Web of Science® Times Cited:92
Deposited By:Mathematics and Physics
Deposited On:2011-05-06
Last Modified:2022-08-23

Repository Staff Only: item control page