DISCOVERY AND MASS MEASUREMENTS OF A COLD, 10 EARTH MASS PLANET AND ITS HOST STAR

Y. Muraki, C. Han, D. P. Bennett, D. Suzuki, L. A. G. Monard, R. Street, U. G. Jorgensen, P. Kundurthy, J. Skowron, A. C. Becker, M. D. Albrow, P. Fouque, D. Heyrovsky, R. K. Barry, J. -P. Beaulieu, D. D. Wellnitz, I. A. Bond, T. Sumi, S. Dong, B. S. GaudiM. Bramich, M. Dominik, F. Abe, C. S. Botzler, M. Freeman, A. Fukui, K. Furusawa, F. Hayashi, J. B. Hearnshaw, S. Hosaka, Y. Itow, K. Kamiya, A. V. Korpela, P. M. Kilmartin, W. Lin, C. H. Ling, S. Makita, K. Masuda, Y. Matsubara, N. Miyake, K. Nishimoto, K. Ohnishi, Y. C. Perrott, N. J. Rattenbury, To. Saito, L. Skuljan, D. J. Sullivan, W. L. Sweatman, P. J. Tristram, K. Wada, P. C. M. Yock, G. W. Christie, D. L. DePoy, E. Gorbikov, A. Gould, S. Kaspi, C. -U. Lee, F. Mallia, D. Maoz, J. McCormick, D. Moorhouse, T. Natusch, B. -G. Park, R. W. Pogge, D. Polishook, A. Shporer, G. Thornley, J. C. Yee, A. Allan, P. Browne, K. Horne, N. Kains, C. Snodgrass, I. Steele, Y. Tsapras, V. Batista, C. S. Bennett, S. Brillant, J. A. R. Caldwell, A. Cassan, A. Cole, R. Corrales, Ch Coutures, S. Dieters, D. Dominis Prester, J. Donatowicz, J. Greenhill, D. Kubas, J. -B. Marquette, R. Martin, J. Menzies, K. C. Sahu, I. Waldman, A. Williams, M. Zub, H. Bourhrous, Y. Matsuoka, T. Nagayama, N. Oi, Z. Randriamanakoto, V. Bozza, M. J. Burgdorf, S. Calchi Novati, S. Dreizler, F. Finet, M. Glitrup, K. Harpsoe, T. C. Hinse, M. Hundertmark, C. Liebig, G. Maier, L. Mancini, M. Mathiasen, S. Rahvar, D. Ricci, G. Scarpetta, J. Skottfelt, J. Surdej, J. Southworth, J. Wambsganss, F. Zimmer, A. Udalski, R. Poleski, L. Wyrzykowski, K. Ulaczyk, M. K. Szymanski, M. Kubiak, G. Pietrzynski, I. Soszynski

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Abstract

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 m(p) = 10.4 +/- 1.7 M-circle plus and orbits a star of mass M-star = 0.56 +/- 0.09 M-circle dot at a semimajor axis of a = 3.2(-0.5)(+1.9) AU and an orbital period of P = 7.6(-1.5)(+7.7) 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.

Original languageEnglish
Article number22
Pages (from-to)-
Number of pages15
JournalAstrophysical Journal
Volume741
Issue number1
DOIs
Publication statusPublished - 1 Nov 2011

Keywords

  • gravitational lensing: micro
  • planetary systems
  • MAGNIFICATION MICROLENSING EVENTS
  • GRAVITATIONAL LENSING EXPERIMENT
  • STELLAR ATMOSPHERE MODELS
  • SNOW LINE
  • EXTRASOLAR PLANETS
  • GALACTIC BULGE
  • SUPER-EARTHS
  • JUPITER/SATURN ANALOG
  • DETERMINISTIC MODEL
  • CORE ACCRETION

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