1. STScI May Symposium 2005 - Baltimore Frédéric Pont (Geneva) Francois Bouchy (Marseille), Claudio Melo (ESO), Nuno Santos (Lisbon), Didier Queloz, Stephane Udry, Michel Mayor (Geneva) Spectroscopic follow-up of transiting exoplanet surveys FLAMES follow-up of OGLE III

2. STScI May Symposium 2005 - Baltimore 7 known transiting exoplanets 10 HD 209458 TrES-1 OGLE-TR-10 OGLE-TR-56 OGLE-TR-111 OGLE-TR-113 OGLE-TR-132 mass-radius relation for hot gas giants

3. STScI May Symposium 2005 - Baltimore The OGLE-III program Ground-based photometric survey for planetary transits ~100’000 targets / square degree  177 transiting candidates in the Galactic disc R c  R Jupiter P c : 0.8 - 8 days V : 15-18 mag  : 5-15 mmag spectroscopic follow-up requires large telescope and <100 m/s accuracy Udalski et al. 2002abc, 2003, 2005, Acta Astr.

4. STScI May Symposium 2005 - Baltimore Field of view 25 arcmin Multi-fiber link to UVES spectrograph (7 targets + 1 Tho) R ~ 45’000  = 480 – 680 nm 45 mn on mv=17  S/N ~ 8  ~30 m/s (The fiber eliminates ~100m/s centering uncertainty in slit) FLAMES+UVES facilities on the VLT

5. STScI May Symposium 2005 - Baltimore Doppler follow-up with UVES+FLAMES 2 x 4 nights on VLT 60 best targets followed using multi-fiber and strategy of real-time fiber reallocation

6. STScI May Symposium 2005 - Baltimore 5 transiting hot Jupiters from the OGLE survey OGLE-TR-56 P=1.2 days Konacki et al. 2003 OGLE-TR-10 P=3.1 days Bouchy et al. 2005, Konacki et al. 2005 OGLE-TR-111 P=4.0 days Pont et al. 2004 OGLE-TR-113P=1.43 days Bouchy et al. 2004, Konacki et al. 2004 OGLE-TR-132P=1.69 days Bouchy et al. 2004, Moutou et al. 2004

7. STScI May Symposium 2005 - Baltimore Stellar transits and eclipses Various configurations of eclipsing binaries can mimic a planetary transit signal grazing eclipses small M-dwarf transits triple/quadruple systems Light curves (Udalski et al. 2002) Velocity curves (Bouchy et al. 2005, Pont et al. 2005)

8. STScI May Symposium 2005 - Baltimore Transit + Radial velocities  mass and radius Proxima HD209458b Gl229b Precise masses and radii Constraints on physics of interior of the object R small star ~ R planet

9. STScI May Symposium 2005 - Baltimore The mass-radius relation from stars to planets Transiting hot Jupiters Planet-sized brown-dwarf edge M dwarfs

10. STScI May Symposium 2005 - Baltimore Spectroscopic follow-up of transit surveys SMALL TELESCOPES OGLE HST

11. STScI May Symposium 2005 - Baltimore The example of OGLE-TR-122b A planet-sized M dwarf M = 96 MJ R= 1.2 RJ P=7.4 days gravitational modulation nnn mmag anti-transit  photometric signal undistinguishable from planetary transit !

12. STScI May Symposium 2005 - Baltimore Spectroscopic follow-up is essential to determine the nature of transiting candidates Possible up to V=18 with FLAMES on the VLT Most candidates are eclipsing binaries (numerous confusion scenarios) Medium-deep surveys offer optimal combination of target density and spectroscopic capabilities Conclusions

13. STScI May Symposium 2005 - Baltimore OGLE-TR-123b 70 M J OGLE-TR-122b 90 M J HD209458b 0.5 M J OGLE-TR-113b 0.5 M J Saturn 0.3 M J

14. STScI May Symposium 2005 - Baltimore OGLE-TR-122b 90 M J HD209458b 0.5 M J OGLE-TR-113 0.5 M J Saturn 0.3 M J OGLE-TR-123b 70 M J