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Journal Articles Astronomy and Astrophysics - A&A Year : 2008

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

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

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 MJ 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.

Dates and versions

hal-00277372 , version 1 (06-05-2008)

Identifiers

Cite

D. Kubas, A. Cassan, M. Dominik, D. P. Bennett, J. Wambsganss, et al.. Limits on additional planetary companions to OGLE 2005-BLG-390L. Astronomy and Astrophysics - A&A, 2008, 483, pp.317-324. ⟨10.1051/0004-6361:20077449⟩. ⟨hal-00277372⟩
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