Volume 483, Number 1, May III 2008
|Page(s)||317 - 324|
|Section||Planets and planetary systems|
|Published online||04 March 2008|
Limits on additional planetary companions to OGLE 2005-BLG-390L
European Southern Observatory, Casilla 19001, Vitacura 19, Santiago, Chile e-mail: firstname.lastname@example.org
2 Astronomisches Rechen-Institut, Zentrum für Astronomie, Heidelberg University, Mönchhofstr. 12–14, 69120 Heidelberg, Germany
3 SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews, KY16 9SS, UK
4 University of Notre Dame, Department of Physics, 225 Nieuwland Science Hall Notre Dame, USA
5 Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France
6 University of Canterbury, Department of Physics & Astronomy, Private Bag 4800, Christchurch, New Zealand
7 Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK
8 Isaac Newton Group, Apartado de Correos 321, 38700 Santa Cruz de La Palma, Spain
9 McDonald Observatory, 16120 St Hwy Spur 78, Fort Davis, TX 79734, USA
10 Dept. of Physics / Boyden Observatory, University of the Free State, Bloemfontein 9300, South Africa
11 Lawrence Livermore National Laboratory, IGPP, PO Box 808, Livermore, CA 94551, USA
12 DSM/DAPNIA, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
13 University of Tasmania, School of Maths and Physics, Private bag 37, GPO Hobart, Tasmania 7001, Australia
14 Physics department, Faculty of Arts and Sciences, University of Rijeka, 51000 Rijeka, Croatia
15 Technical University of Vienna, Dept. of Computing, Wiedner Hauptstrasse 10, Vienna, Austria
16 Observatoire Midi-Pyrénées, UMR 5572, 14 avenue Edouard Belin, 31400 Toulouse, France
17 Niels Bohr Institute, Astronomical Observatory, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
18 Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055, USA
19 Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia
20 South African Astronomical Observatory, PO Box 9 Observatory 7935, South Africa
21 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
22 Astronomy Unit, School of Mathematical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK
Accepted: 18 February 2008
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-390L would 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.
Key words: stars: planetary systems / gravitational lensing
© ESO, 2008
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