EXODAT : Data Base for CoRoT/ Exoplanets

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Exoplanets Complementary Observations Working
Group
Chair M. Deleuil
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Goal
organise and coordinate observational efforts
for programs using the exoplanet channel.
prepare the targets selection mask allocation
prepare the scientific analysis
prepare follow-up observations of transit
candidates confirmation characterization
Who is concern?
People who intend to use exo-channel data
exoplanet core program add. programs
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Focal plane
N
3.5º
Secondary targets mv lt 9
2.8º
Exoplanet field
Main target mv ? 6
stars with 11 lt mv lt 16
in principle ..
6000 photometric windows per CCDs targets
should be selected.
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Targets selection

• Criteria

? Scientific - Favourite late type
dwarves

• ? Environmental
• - crowding effects

• Instrumental
• - the shape of the PSF changes as a
  function of

• the location of the stars on the CCD
• stars colors
• stars magnitude

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Targets selection

• Criteria

? Scientific - Favourite late type
dwarves

• ? Environmental
• - crowding effects

• Instrumental
• - the shape of the PSF changes as a
  function of

• the location of the stars on the CCD
• stars colors
• stars magnitude

stars with 11 lt mv lt 16 at low galactic latitude
no catalogue provides the spectral
classification
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Preparatory Observations - Step 1
Exoplanet domain 20?
HD 171834 Potential main target for the astero.
program
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Preparatory Observations - Step 1

• Long runs ( 20?)
• ? 4 106 stars with mv lt 16
• UBVRI Photometry - since 2001
• - 2.5 INT/La Palma 24 nights
• Will be complete at the end 2005
• - CFHT/12K ? a few deep exposures in R
  filter in order to characterize background stars.
  

Catalogues

• Used for the spectral classification
• will be used for the targets selection for short
  runs 

• DENIS/2Mass
• USNO-A2
• Hipparcos/Tycho

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Ground-based Observations - Status
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The ExoDat Data Base scientific DB for exoplanet
channel

• Archive the ground-based observations
• Cross-correlate these data with existing
  catalogues
• Perform the spectral classification
• Validate algorithms
• - allocation of the best photometric mask
• - estimate the contamination for each
  potential target
• Prepare the scientific analysis

• Validate the data provided to CoRotSky for the
  Exoplanet channel

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Spectral Classification
1) Dwarf / Giant sorting Ground
based observations cross-correlated with 2Mass
and/or DENIS data
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Spectral Classification exemple
HD174866 field
Giants
V - i
Main Seq.
i
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Spectral Classification
1) Dwarf / Giant sorting From ground
based observations cross-correlated with 2Mass
and/or DENIS data ? luminosity class
good level of confidence for stars brighter than
15 in R
2) UBVRIJHK data compared with SEDs from a
spectral library Estimate of the
spectral type of each star the 3 best
solutions are saved. Potential binarity is
included.
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Additional informations on the target selection
process
for additional programs..
density of stars with R 15 6000 (HD
177552) overlapping 30 ? 4200
potential targets / deg2 i.e. 5880
potential targets per CCD
density of stars with R 15 3100 (HD
49434) overlapping 20 ? 2480 potential
targets / deg2 i.e. 3470 potential
targets per CCD
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Preparatory Observations - Step 2
Once CCDs position will be fixed ..

• GIRAFFE/VLT observations Dec 2004 Jan
  2005
• (Guaranteed time Open time) ? A.M. Hubert
  on monday
• VIMOS/VLT ? V. Repipi on tuesday
• Brazilian observational facilities ? discussion
  on tuesday
• Goal for stars with mv lt 15
• check improve the spectral classification
• identify binaries
• derive stellar parameters Teff,
  logg, vsini ..
• identify hot Jupiter in COROT fields

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Preparatory Observations - Step 2

BEST (H. Rauer ) monitoring of the
Exo-fields (mv lt 14.5) 1 or 2 field per season
Interest binaries identification
variable stars identification
Geneva system (C. Aerts ) Goal
classification of variable stars BUT FOV
6.5x6.5 ! Interest and feasibility to be
demonstrated (next CW)

(F. Favata ) Interest stellar activity,
identify young stars .. (under study)
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ExoDat Data Base
a,d error mag_R
Background mV gt 16
Spect. type Logg, vsini, Radius, metal. ..
Spectroscopic obs.
a,d error mag_Uerr mag_Berr mag_Verr mag_Rer
r mag_Ierr mag_Jerr mag_Herr mag_Kerr Colors I
mages
Spect. type Lum. class Binarity
Broad Band Photom.
Spect. Classif. Soft.
Variability, X-rays..
Ground Surveys Add Prog.
Contamination
CoRoTSky
catalogues
mv lt 11
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Exo-stars in CoRoTSky
Contamination Spect. Type Lum. Class Binarity V_mi
n/V_max
a,d error mag_Berr mag_Verr mag_Rerr mag_Ier
r
star type
catalogues
mv lt 11
Star type information from add. programs
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Follow-up Observations

• Necessary in order to
• remove ambiguities,
• better characterize the nature of the detected
  planet
• derive accurate spectral parameters of the
  parent star.

Radial velocity measurements
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Radial velocity follow-up strategy - 1

• SOPHIE 1.93m OHP/France
• Fiber-fed cross-dispersed Echelle
  spectrograph
• 1st commissioning by the end of 2005
• 3 m/s in 1 hour for mv 12.5
• 2m TLS - TAUTENBOURG Germany
• Remove ambiguities
• HR Spectrocopy of the parent star
• Characterization of all the companions with
• masses ? Jupiter
• Filter the targets for HARPS and UVESFLAMES

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Radial velocity follow-up strategy - 2

• HARPS 3.6m La Silla
• 3 30 M? (10 M? - 0.1 AU - G0 - mv14)
• 50 nights already allocated in HARPS guaranteed
  time
• Possibility to follow-up immediately a detected
  transit
• Additional nights ? ESO proposals
• UVESFLAMES 8.2m Paranal
• 0.1 1 MJup (0.3 MJup - 0.1 AU - G0 - mv16)
• ESO proposal ? 12 months of delay

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In conclusion ..
We are dealing with a large set of data A lot of
work has already been done but help is very
welcome