Transcript The Blind Test in colors

The Blind Test in colors
C. Moutou, R. Cautain, D. Blouin,
A. Lanza, S. Aigrain, H. Deeg, …
Objectives of BT2
Use color information in LC analysis
Develop relevant tools
Use of colors early in the process (for
optimizing follow-up activities)
Focus on identification not on detection
Transit fit
Identification of out-of-transit signal (secondary
eclipses, sinusoidal sig)
Final system parameters
Brick 1: Simulations with Inst. Models
V=13, Tc=6000K
(D. Blouin)
Corot Bandpasses (R. Cautain)
 Several elements exists to compute an
estimation :
Transmission of Corot optics
CCD quantum efficiency
Monochromatic PSF
Instrument model (customized) to handle the data
 And depending on the colour temperature :
Masks
Synthetic stellar spectra
Scientific specifications of limits for Red and Blue
channels
 After integration : Repartition of energy on the
CCD. Significance : TBD !
Used version of bandpasses (slight differences)
Tc=6000K
Best version of bandpasses, ready to be used
Tc=5000K
Potential uses and revisability
 Uses :
 Compute stellar contribution in synthetic lightcurves : Blind Test 2 !
 Estimators of chromaticity can be implemented and tested :
• Scientific specifications
• P. Bordé thesis
 Revisions :
 The computation may be discussed (many contributors could be
implied)
 Significance and risks of error should be studied
 Data about the instrument will be updated
 Models about stellar activity, chromaticity will be updated
 Such a job requires manpower
Bricks of BT2: 2. Stellar variability
 Teff = 4000, 5000, 6000, 7000K
 Prot = 3, 10, 20 days
 Kurucz spectra integrated in CoRoT bandpasses
 2 options for the facular behaviour
 2 options for the super-granulation
 « Merged » light curved (Lanza+Aigrain styles)
include:
 Super-granulation and granulation
 Rotational modulation
Bricks of BT2: 2. Stellar variability
(DF/F)l / (DF/F)bol
Bricks of BT2: 2. Stellar variability
From CoRoT spec document
Bricks of BT2: 3. Planetary transits
Limb darkening coefficients calculated for
CoRoT colored channels ( C. Barban)
Quadratic law, with Teff estimated from Exodat
UTM (H. Deeg) for light curve simulation
Simulated cases are somewhat arbitrary
(although based on current knowledge on exoplanets)
Bricks of BT2: 4. Eclipsing binaries
Close binaries only
Nightfall simulation software (R. Wichmann)
Parameters are again somewhat arbitrary
(although based on 10000 OGLE binaries statistics, Devor 2005)
LD are taken in neighbour Bessel filters
(some error here)
Nightfall, R. Wichmann
Compared chromaticity
(DF/F)l / (DF/F)bol
Bricks of BT2: 2. Stellar variability
From CoRoT spec document
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UTM simulation of HD189733b
Input catalog
From EXODAT real configurations!
(information available to BT2 users)
All LC have a detectable event (presumed)
Relative frequencies are from CoRoTLux
estimations
Assumptions from Corotlux estimates
(anticenter)
15 hot Jupiters
7 hot Neptunes
1 Super Earth
3 background hot Jupiters
40 brazing binaries
90 low-mass companion binaries
150 background eclipsing binaries
EXODAT extract: Boxes are 18’’x36’’
Proposed Organization
 Light curves delivery: early 2006
 Use of mailing list: [email protected]
 Subscriptions to [email protected]
 Detection/identification in warning mode: LAM
 on shorter light curves: 10-20-50-(150) days
 Full analysis: efforts should be coordinated
 Detection of main transits
 Search for signals out of main transit
 Compare events in colored channels
 Transit fitting (inc. Exodat information)
 Comparison with neighbours: a posteriori at LAM
Needs for developments
or BT2 outputs
Eclipsing binaries in the CoRoT colored
channels: adapt Nightfall or leave it to
other people in CoRoT community?
Combined transit fitting in three colors
Hierarchical tree for verifications