The Doppler follow-up of COROT transit candidates F. Bouchy Laboratoire d’Astrophysique de Marseille Corot Week 8 – 23/27 May 2005

Review of the Doppler follow-up of OGLE transit candidates 137 transit candidates in bulge and carina field Follow-up of 60 candidates 56 hours with FLAMES 1.30-m telescope (Las Campanas)

NameP [day]M [M Jup ]R [R jup ]Reference OGLE-TR-113b Bouchy et al., 2004, A&A, 421, L13 OGLE-TR-132b Moutou et al., 2004, A&A, 424, L31 OGLE-TR-111b Pont et al., 2004, A&A, 426, L15 OGLE-TR-56b Bouchy et al., 2005, A&A, 431, 1105 OGLE-TR-10b Bouchy et al., 2005, A&A, 431, 1105 OGLE-TR-122b Pont et al., 2005, astro-ph/

The Zoo of the radial velocity follow-up eclipsing M-dwarfs [24] grazing EB [5] Multiple systems [12] Falses positives [7] Unsolved cases [7] Bouchy et al., 2005, A&A, 431, 1105 Pont et al., 2005, A&A, in press (astro-ph/ )

Strategy of Doppler follow-up Step 0 – Careful analysis of light curve  shape, contrast, duration, periodicity, ellipsoidal modulation  color information  other informations (EXODAT)

Strategy of Doppler follow-up Step 1 - One spectroscopic measurement  SB2  vsini / synchronization  spectral type  RV uncertainty (photon noise)

Strategy of Doppler follow-up Step 2a - Two Doppler measurements at T 0 -P/4 and T 0 +P/4  SB1  not in phase with expected transit  no variation Step 2b - Two Doppler measurements at T 0 –  T/2 and T 0 +  T/2  Rossiter effect (in case of large vsini and long P)

Mass characterization Step 3 – Make a choice :  Stop follow-up  repeat step 2 with a higher precision spectrograph  Re-analyze of the light curve  Start other follow-up (HAR photometry / …)  Start mass characterization

FLAMES 8.2m Paranal HARPS 3.6m La Silla SOPHIE 1.93m OHP CORALIE 1.2m La Silla CES 2m Tautenburg

SpectrographmvPrecision in 1 hour (solar type star) Availability per semester CORALIE (1.2-m) m/s 40 m/s 20 nights SOPHIE (1.93-m) m/s 12 m/s 45 m/s 20 nights CES Tautenburg (2-m)1250 m/s? HARPS (3.6-m) m/s 6 m/s 20 m/s 10 nights UVES+FLAMES (8.2-m) m/s 30 m/s ESO proposal

CORALIE 1 hour - mv= m/s 1 hour - mv= m/s 1.0 ± 0.2 M Jupiter - 10 days - G0  K= 95 ± 19 m/s mv=12  1.5 hour mv=14  9 hours ~ 1 nights 20 nights/semester already allocated for COROT Available for an immediate follow-up Pre-selection of the SOPHIE and/or HARPS targets But limited to bright targets

CES - Tautenburg 1 hour - mv= m/s 1.0 ± 0.2 M Jupiter - 10 days - G0  K= 95 ± 19 m/s mv=12  14 hours ~ 2 nights ? nights/semester allocated for COROT Available for an immediate follow-up Pre-selection of the SOPHIE and/or HARPS targets But limited to bright targets

SOPHIE 1 hour - mv= m/s 1 hour - mv= m/s 1 hour - mv= m/s 0.5 ± 0.1 M Jupiter - 10 days - G0  K= 47 ± 9 m/s mv=12  1 hour mv=14  4 hours mv=16  50 hours ~ 6 nights 20 nights/semester allocated for COROT Available for an immediate follow-up Mass characterization of hot Jupiters Pre-selection of the HARPS targets

FLAMES + UVES 1 hour - mv= m/s (25 m/s in practice) 1 hour - mv= m/s (30 m/s in practice) 0.5 ± 0.1 M Jupiter – 10 days - G0  K= 47 ± 9 m/s mv=14  15 heures ~ 2 nights (for 7 targets) mv=16  22 heures ~ 3 nights (for 7 targets) Software improvement  push systematics bellow 25 m/s Follow-up of ambiguous cases and fainter stars Mass characterization of hot Jupiters Pre-selection of the HARPS targets

20 ± 4 M earth – 10 days - G0  K= 6.0 ± 1.2 m/s mv=12  6 hours mv=14  50 hours ~ 6 nights 10 nights/semester already allocated for COROT Available for an immediate follow-up Dedicate for high precision mass characterization of confirmed planets (hot Neptune) HARPS 1 hour - mv= m/s 1 hour - mv= m/s 1 hour - mv= m/s (30 m/s in practice) 15 m/s (with High Efficiency Mode)

Semester telescope’s need Expected detections 1 – 10 M J [~ 2 transits] 0.1 – 1 M J [~ 20 transits] 10 – 30 M earth [~ 6 transits] EB + BEB [~ 100 cases ?] First confirmation : 20 nights CORALIE (160 measurements) 10 nights SOPHIE (80 measurements) ? nights CES Tautenburg Precise mass characterization : 10 nights SOPHIE (80 measurements) 10 nights HARPS (80 measurements) + ESO Proposals ? Ambiguous cases : 7 nights FLAMES (400 measurements)

Schedule SepOctNovDecJanFebMarAprMayJunJulAug Corot Observation Galactic Center First list of candidates from alarm mode N2 data Paranal+La Silla follow-up window OHP follow-up window