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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, (May) Article A102. ISSN 0004-6361 (2011) [Refereed Article]

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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 M¡Ñ < Mhost < 0.49 M¡Ñ at 90% confidence. The planet-star mass ratio q = 0.0132 ¡À 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 M¡Ñ. Methods. The host mass is determined from two ¡°higher order¡± microlensing parameters. One of these, the angular Einstein radius E = 0.31 ¡À 0.03mas has been accurately measured, but the other (the microlens parallax E, which is due to the Earth¡¯s 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:Cole, A (Professor Andrew Cole)
UTAS Author:Greenhill, J (Dr John Greenhill)
ID Code:69621
Year Published:2011
Web of Science® Times Cited:85
Deposited By:Mathematics and Physics
Deposited On:2011-05-06
Last Modified:2017-11-06

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