Limits on additional planetary companions to OGLE 2005-BLG-390L

D. Kubas, A. Cassan, M. Dominik, D. P. Bennett, J. Wambsganss, S. Brillant, J. P. Beaulieu, M. D. Albrow, V. Batista, M. Bode, D. M. Bramich, M. Burgdorf, J. A.R. Caldwell, H. Calitz, H. Cook, Ch Coutures, S. Dieters, D. Dominis Prester, J. Donatowicz, P. FouquéJ. Greenhill, K. Hill, M. Hoffman, K. Horne, U. G. Jørgensen, N. Kains, S. Kane, J. B. Marquette, R. Martin, P. Meintjes, J. Menzies, K. R. Pollard, K. C. Sahu, C. Snodgrass, I. Steele, Y. Tsapras, C. Vinter, A. Williams, K. Woller, M. Zub

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Aims. We investigate constraints on additional planets orbiting the distant M-dwarf star OGLE 2005-BLG-390L, around which photometric microlensing data has revealed the existence of the sub-Neptune-mass planet OGLE 2005-BLG-390Lb. We specifically aim to study potential Jovian companions and compare our findings with predictions from core-accretion and disc-instability models of planet formation. We also obtain an estimate of the detection probability for sub-Neptune mass planets similar to OGLE 2005-BLG-390Lb using a simplified simulation of a microlensing experiment.Methods. We compute the efficiency of our photometric data for detecting additional planets around OGLE 2005-BLG-390L, as a function of the microlensing model parameters and convert it into a function of the orbital axis and planet mass by means of an adopted model of the Milky Way.Results. We find that more than of potential planets with a mass in excess of between 1.1 and 2.3 AU around OGLE 2005-BLG-390Lwould have revealed their existence, whereas for gas giants above in orbits between 1.5 and 2.2 AU, the detection efficiency reaches ; however, no such companion was observed. Our photometric microlensing data therefore do not contradict the existence of gas giant planets at any separation orbiting OGLE 2005-BLG-390L. Furthermore we find a detection probability for an OGLE 2005-BLG-390Lb-like planet of around . In agreement with current planet formation theories, this quantitatively supports the prediction that sub-Neptune mass planets are common around low-mass stars.

Original languageEnglish
Pages (from-to)317-324
Number of pages8
JournalAstronomy and Astrophysics
Issue number1
Publication statusPublished - 1 May 2008



  • Gravitational lensing
  • Stars: planetary systems

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kubas, D., Cassan, A., Dominik, M., Bennett, D. P., Wambsganss, J., Brillant, S., Beaulieu, J. P., Albrow, M. D., Batista, V., Bode, M., Bramich, D. M., Burgdorf, M., Caldwell, J. A. R., Calitz, H., Cook, H., Coutures, C., Dieters, S., Dominis Prester, D., Donatowicz, J., ... Zub, M. (2008). Limits on additional planetary companions to OGLE 2005-BLG-390L. Astronomy and Astrophysics, 483(1), 317-324.