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Discovery and mass measurements of a cold, 10 Earth mass planet and its host star

Muraki, Y.; Han, C.; Bennett, D. P.; Suzuki, D.; Monard, L. A. G.; Street, R.; Jorgensen, U. G.; Kundurthy, P.; Skowron, J.; Becker, A. C.; Albrow, M. D.; Fouqué, P.; Heyrovský, D.; Barry, R. K.; Beaulieu, J.-P.; Wellnitz, D. D.; Bond, I. A.; Sumi, T.; Dong, S.; Gaudi, B. S.; Bramich, D. M.; Dominik, M.; Abe, F.; Botzler, C. S.; Freeman, M.; Fukui, A.; Furusawa, K.; Hayashi, F.; Hearnshaw, J. B.; Hosaka, S.; Itow, Y.; Kamiya, K.; Korpela, A. V.; Kilmartin, P. M.; Lin, W.; Ling, C. H.; Makita, S.; Masuda, K.; Matsubara, Y.; Miyake, N.; Nishimoto, K.; Ohnishi, K.; Perrott, Y. C.; Rattenbury, N. J.; Saito, To.; Skuljan, L.; Sullivan, D. J.; Sweatman, W. L.; Tristram, P. J.; Wada, K.; Yock, P. C. M.; Christie, G. W.; DePoy, D. L.; Gorbikov, E.; Gould, A.; Kaspi, S.; Lee, C.-U.; Mallia, F.; Maoz, D.; McCormick, J.; Moorhouse, D.; Natusch, T.; Park, B.-G.; Pogge, R. W.; Polishook, D.; Shporer, A.; Thornley, G.; Yee, J. C.; Allan, A.; Browne, P.; Horne, K.; Kains, N.; Snodgrass, C.; Steele, I.; Tsapras, Y.; Batista, V.; Bennett, C. S.; Brillant, S.; Caldwell, J. A. R.; Cassan, A.; Cole, A.; Corrales, R.; Coutures, Ch.; Dieters, S.; Dominis Prester, D.; Donatowicz, J.; Greenhill, J.; Kubas, D.; Marquette, J.-B.; Martin, R.; Menzies, J.; Sahu, K. C.; Waldman, I.; Williams, A.; Zub, M.; Bourhrous, H.; Matsuoka, Y.; Nagayama, T.; Oi, N.; Randriamanakoto, Z.; Bozza, V.; Burgdorf, M. J.; Calchi Novati, S.; Dreizler, S.; Finet, F.; Glitrup, M.; Harpsøe, K.; Hinse, T. C.; Hundertmark, M.; Liebig, C.; Maier, G.; Mancini, L.; Mathiasen, M.; Rahvar, S.; Ricci, D.; Scarpetta, G.; Skottfelt, J.; Surdej, J.; Southworth, J.; Wambsganss, J.; Zimmer, F.; Udalski, A.; Poleski, R.; Wyrzykowski, Ł.; Ulaczyk, K.; Szymański, M. K.; Kubiak, M.; Pietrzyński, G. and Soszyński, I. (2011). Discovery and mass measurements of a cold, 10 Earth mass planet and its host star. Astrophysical Journal, 741(1), article no. 22.

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We present the discovery and mass measurement of the cold, low-mass planet MOA-2009-BLG-266Lb, performed with the gravitational microlensing method. This planet has a mass of mp = 10.4 ± 1.7 M and orbits a star of mass M = 0.56 ± 0.09 M at a semimajor axis of a = 3.2+1.9-0.5 AU and an orbital period of P = 7.6+7.7-1.5 yrs. The planet and host star mass measurements are enabled by the measurement of the microlensing parallax effect, which is seen primarily in the light curve distortion due to the orbital motion of the Earth. But the analysis also demonstrates the capability to measure the microlensing parallax with the Deep Impact (or EPOXI) spacecraft in a heliocentric orbit. The planet mass and orbital distance are similar to predictions for the critical core mass needed to accrete a substantial gaseous envelope, and thus may indicate that this planet is a "failed" gas giant. This and future microlensing detections will test planet formation theory predictions regarding the prevalence and masses of such planets.

Item Type: Journal Item
Copyright Holders: 2011 The American Astronomical Society
ISSN: 1538-4357
Extra Information: 15 pp.
Keywords: gravitational lensing; planetary systems
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)
Item ID: 43074
Depositing User: Colin Snodgrass
Date Deposited: 27 May 2015 10:48
Last Modified: 07 Dec 2018 10:31
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