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

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, K. H.; Coutures, Ch.; Dieters, S.; Dominis Prester, D.; Donatowicz, J.; Fouqué, P.; Greenhill, J.; Hill, K.; Hoffman, M.; Horne, K.; Jørgensen, U. G.; Kains, N.; Kane, S.; Marquette, J. B.; Martin, R.; Meintjes, P.; Menzies, J.; Pollard, K. R.; Sahu, K. C.; Snodgrass, Colin; Steele, I.; Tsapras, Y.; Vinter, C.; Williams, A.; Woller, K. and Zub, M. (2008). Limits on additional planetary companions to OGLE 2005-BLG-390L. Astronomy & Astrophysics, 483(1) pp. 317–324.



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˱/I<J between 1.1 and 2.3 AU around OGLE 2005-BLG-390L would have revealed their existence, whereas for gas giants above 3 M˱/I>J 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.

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