1. Searching for low mass extra solar planets via microlensing. Jean-Philippe Beaulieu, Virginie Batista, Arnaud Cassan, Christian Coutures, Jadzia Donatowicz, Pascal Fouqué, Daniel Kubas, Jean-Baptiste Marquette, Olivier Mousis, et al. (PLANET/RoboNET, HOLMES) Europlanet, Potsdam

2. 1-7 kpc from Sun Galactic centerSun 8 kpc Light curve Source star and images Lens star and planet Observer Target Field in the Central Galactic Bulge

3. A planetary companion

5. Hunting for planets via microlensing Detecting real time microlensing event : OGLE-III and MOA 2 Selecting microlensing event with good planet detection efficiency Two schools : - Mainly high magnification events and alerted anomalies (microFUN) - Monitoring a larger number of events (PLANET/ROBONET). Networks of telescopes to do 24 hours monitoring : PLANET/RoboNET, microFUN Accurate photometry (Image subtraction since 2006) Real time analysis and modeling All data, models, are shared immediately among the microlensing community. Cooperation is the way to go ! OGLE-III has an online anomaly detector (EWS) MOA-II Detecting anomalies real time :

6. PLANET collaboration : Probing Lensing Anomaly NETwork (current members) http://planet.iap.fr M. D. Albrow, J.P. Beaulieu, D. Bennett, D. Bramich, S. Brillant, J. A. R. Caldwell, H. Calitz, A Cassan, K. Cook, C. Coutures, M. Dominik, J. Donatowicz, D. Dominis, P. Fouqué, J. Greenhill, K. Hill, M. Hoffman, K. Horne, U. Jorgensen, S. Kane, D. Kubas, R. Martin, J. Menzies, P. Meintjes, K. R. Pollard, K. C. Sahu, Y. Tsapras,J. Wambsganss, A. Williams, M. Zub Institut d'Astrophysique de Paris, INSU CNRS, Paris, France Univ. of Canterbury, Dept. of Physics & Astronomy, Christchurch, New Zealand South African Astronomical Observatory, South Africa Boyden Observatory, Bloemfountein, South Africa Canopus observatory, Univ. of Tasmania, Hobart, Australia Niels Bohr Institute, Copenhagen, Denmark Univ. of Potsdam, Potsdam, Germany Space Telescope Science Institute, Baltimore, U.S.A. Perth Observatory, Perth, Australia Boyden 1.5m

7. PLANET/RoboNet SITES PLANET/RoboNet SITES ESO Danish 1.54m 2003-2008 Sutherland, SAAO 1m 2002+ Boyden, 1.5m, CCD 2006, 2007 Perth 0.6m 2002-2007+ Hobart 1m, 2002-2007+ Brazil 0.6m, 2007+ Robonet : Liverpool 2m, Canary 2005+ Faulkes North 2m, Hawaii 2006+ Faulkes South 2m, Australia 2007+ Goals at each site : - 1 % photometry, - Adapted Sampling rate - Online analysis. Boyden 1.5m

8. OBSERVING STRATEGY, DECISION TAKING Homebase checks : - OGLE, MOA alert pages - results from Bayesian PSPL fits to OGLE data (Albrow) - results from K.Horne priority pages - data collected by PLANET/RoboNet and current fits He can ask for data to be re-reduced to double check anomalies. Then he decides an observing strategy, sampling rates for different events He issues anomaly alerts to the community. Homebase should be on the deck 24 hours a day for 2-3 weeks

9. Real time analysis system Data from all site uploaded to Paris every 5 min http://planet.iap.fr RoboNet SAAO Boyden Chile Hobart Perth Brasil Data stored in Paris Models updated Prediction of future behavior Alert if anomalies In Out

10. OGLE-2005-BLG-390

11. OGLE-2005-BLG-390 Coopération : PLANET/RoboNET, OGLE-III, MOA-II

12. AT LAST, A TEXT BOOK MICROLENSING EVENT Data in the anomaly from : PLANET-Danish, OGLE, MOA-II, PLANET-Perth Data outside the anomaly from : PLANET/Robonet, PLANET-Hobart Gould Loeb 1992, Bennett & Rhie 1996, …

13. PROBABILITY DENSITIES OF THE STAR AND ITS PLANET

14. A companion to this frozen super Earth ? Kubas et al., 2007 submitted Excluding at : 50 % Jupiter over 1.1-2.3 AU 70 % 3 Jupiter over 1.5-2.2 AU Core accretion models by Idal & Lin

15. Gould et al. 2006, MicroFUN, OGLE, RoboNet OGLE-2005-BLG-169Lb : a weak Neptune planet signal

18. A new Jovian analogue in a resonnant caustic system

19. 4 5

21. 5 microlensing planets, their time scale. Do gas giants prefer host stars that cause longer events ? Ie more massive ones ? KB-07-197

22. PLANET/Robonet/HOLMES (network of 9 telescopes). Now – 200? MicroFUN Now-200? OGLE III and MOA-2 - Constraints on Jupiters and low mass planets (down to few Earth mass) - Monitoring of high mag events - Monitoring of any mag events (PLANET/RoboNet, OGLE) Las cumbres plans ? A 1m observing in J from Antartica ? Network of wide field imager Earth Hunter + OGLE-IV + MOA-2 2011+ ? Statistics on Cool Earth mass planets, possibly habitable zone. NASA mission MPF ( PI Bennett) to be re-submitted ? ESA DUNE mission (cosmic shear + planet search ) Abundance of planets in habitable zone. MPF : 36 months, 200 million stars, 4 fields of 0.66 sq2, FWHM=0.25 arcsec ~100 q Earth, ~6000 q Jupiter (q fraction of stars with planets), Mars detectable Current status of microlensing planet hunting

23. CONCLUSION Microlensing is probing “Frozen” planets. 5 microlensing planets for 3 scenarios : 2 Strong caustic 2 High mag central caustic 1 Planetary caustic 3 ~Jupiters, 1 ~5.5 Earth, 1 ~13 Earth (Probability of detecting Jupiters is ~50 times larger) Giant planets are rare, suggests 1-15 M EARTH might be common Giant planets in events with large t E (more massive stars) Several planets in “stock”… modeling underway. ~Earth mass planets on ~AU orbits to be discovered soon…