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, K. H. Cook, Ch. Coutures, S. Dieters, D. Dominis Prester, J. Donatowicz, P. FouqueJ. Greenhill, K. Hill, M. Hoffman, K. Horne, U. G. Jorgensen, 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, PLANET RoboNet Collaboration

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

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 50% of potential planets with a mass in excess of 1 M-J between 1.1 and 2.3 AU around OGLE 2005-BLG-390L would have revealed their existence, whereas for gas giants above 3 MJ in orbits between 1.5 and 2.2 AU, the detection efficiency reaches 70%; 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 2-5%. 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 & Astrophysics
Volume483
DOIs
Publication statusPublished - May 2008

Keywords

  • stars : planetary systems
  • gravitational lensing
  • NEPTUNE-MASS PLANETS
  • MICROLENSING EVENT
  • GALACTIC PLANETS
  • SUPER-EARTHS
  • DETERMINISTIC MODEL
  • EXTRASOLAR PLANETS
  • HIGH-MAGNIFICATION
  • STARS
  • STELLAR
  • SYSTEM

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