The Open UniversitySkip to content
 

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

Batista, V.; Gould, A.; Dieters, S.; Dong, S.; Bond, I.; Beaulieu, J. P.; Maoz, D.; Monard, B.; Christie, G. W.; McCormick, J.; Albrow, M. D.; Horne, K.; Tsapras, Y.; Burgdorf, M. J.; Calchi Novati, S.; Skottfelt, J.; Caldwell, J.; Kozłowski, S.; Kubas, D.; Gaudi, B. S.; Han, C.; Bennett, D. P.; An, J.; Abe, F.; Botzler, C. S.; Douchin, D.; Freeman, M.; Fukui, A.; Furusawa, K.; Hearnshaw, J. B.; Hosaka, S.; Itow, Y.; Kamiya, K.; Kilmartin, P. M.; Korpela, A.; Lin, W.; Ling, C. H.; Makita, S.; Masuda, K.; Matsubara, Y.; Miyake, N.; Muraki, Y.; Nagaya, M.; Nishimoto, K.; Ohnishi, K.; Okumura, T.; Perrott, Y. C.; Rattenbury, N.; Saito, To.; Sullivan, D. J.; Sumi, T.; Sweatman, W. L.; Tristram, P. J.; von Seggern, E.; Yock, P. C. M.; Brillant, S.; Calitz, J. J.; Cassan, A.; Cole, A.; Cook, K.; Coutures, C.; Dominis Prester, D.; Donatowicz, J.; Greenhill, J.; Hoffman, M.; Jablonski, F.; Kane, S. R.; Kains, N.; Marquette, J.-B.; Martin, R.; Martioli, E.; Meintjes, P.; Menzies, J.; Pedretti, E.; Pollard, K.; Sahu, K. C.; Vinter, C.; Wambsganss, J.; Watson, R.; Williams, A.; Zub, M.; Allen, W.; Bolt, G.; Bos, M.; DePoy, D. L.; Drummond, J.; Eastman, J. D.; Gal-Yam, A.; Gorbikov, E.; Higgins, D.; Janczak, J.; Kaspi, S.; Lee, C.-U.; Mallia, F.; Maury, A.; Monard, L. A. G.; Moorhouse, D.; Morgan, N.; Natusch, T.; Ofek, E. O.; Park, B.-G.; Pogge, R. W.; Polishook, D.; Santallo, R.; Shporer, A.; Spector, O.; Thornley, G.; Yee, J. C.; Bozza, V.; Browne, P.; Dominik, M.; Dreizler, S.; Finet, F.; Glitrup, M.; Grundahl, F.; Harpsøe, K.; Hessman, F. V.; Hinse, T. C.; Hundertmark, M.; Jørgensen, U. G.; Liebig, C.; Maier, G.; Mancini, L.; Mathiasen, M.; Rahvar, S.; Ricci, D.; Scarpetta, G.; Southworth, J.; Surdej, J.; Zimmer, F.; Allan, A.; Bramich, D. M.; Snodgrass, C.; Steele, I. A. and Street, R. A. (2011). MOA-2009-BLG-387Lb: a massive planet orbiting an M dwarf. Astronomy & Astrophysics, 529, article no. A102.

DOI (Digital Object Identifier) Link: https://doi.org/10.1051/0004-6361/201016111
Google Scholar: Look up in Google Scholar

Abstract

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 < Mhost < 0.49 M 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 M.

Methods. The host mass is determined from two “higher order” microlensing parameters. One of these, the angular Einstein radius θE = 0.31 ± 0.03 mas has been accurately measured, but the other (the microlens parallax πE, 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, 1.1 AU < a < 2.7 AU, and 3.8 yr < P < 7.6 yr, respectively.

Item Type: Journal Item
Copyright Holders: 2011 ESO
ISSN: 1432-0746
Extra Information: 16 pp.
Keywords: gravitational lensing; data analysis; planets; satellites; detection methods; adaptive optics; photometers
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Centre for Electronic Imaging (CEI)
Space
Item ID: 43080
Depositing User: Colin Snodgrass
Date Deposited: 02 Jun 2015 10:40
Last Modified: 07 Dec 2018 10:31
URI: http://oro.open.ac.uk/id/eprint/43080
Share this page:

Metrics

Altmetrics from Altmetric

Citations from Dimensions

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU