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. Fouqué, D. Heyrovsk, R. K. Barry, J. P. Beaulieu, D. D. Wellnitz, I. A. Bond, T. Sumi, S. Dong, B. S. GaudiD. M. 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. Harpsøe, 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. Szymański, M. Kubiak, G. Pietrzyński, I. Soszyński

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

97 Scopus citations

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 mp = 10.4 1.7 M and orbits a star of mass M = 0.56 0.09 M at a semimajor axis of AU and an orbital period of 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
JournalAstrophysical Journal
Volume741
Issue number1
DOIs
StatePublished - 1 Nov 2011

Funding

FundersFunder number
National Science Foundation0708890, 1009621, 0757888
National Science Foundation
Seventh Framework Programme246678
Seventh Framework Programme
Science and Technology Facilities CouncilPP/E002137/1, PP/E001149/1, ST/H002391/1, ST/G001987/1, ST/G002355/1, PP/F000057/1, PP/D000955/1, ST/J000035/1
Science and Technology Facilities Council
Japan Society for the Promotion of Science23340044, 10J07272, 23340064, 23540339, 22403003, 23654082, 23103002
Japan Society for the Promotion of Science

    Fingerprint

    Dive into the research topics of 'Discovery and mass measurements of a cold, 10 earth mass planet and its host star'. Together they form a unique fingerprint.

    Cite this