1. Searching for transiting Extra-Solar planets “Pre-OmegaTranS”
Johannes Koppenhöfer
Leiden
1/23
Searching for transiting
Extra-Solar planets
“Pre-OmegaTranS”
Datareduction in AstroWISE

2. global statistics: 265 planets found
Johannes Koppenhöfer
Leiden
2/23
global statistics:
265 planets found
source: (J. Schneider)

3. measuring radius and density:
Johannes Koppenhöfer
Leiden
3/23
measuring radius and density:
ΔF/F = (Rpl/R*)2 => ρ !!!
TrES-4
HAT-P-1

4. measuring thermal emission:
Johannes Koppenhöfer
Leiden
4/23
measuring thermal emission:
TrES-1b: T = 1060K +/- 50K
(Charbonneau et al. 2005)
HD209485b: T = 1130 K +- 60K
(Deming et al. 2005)
GJ436b: T = 717K +- 35K
(Demory et al. 2007)
HD189733b: T = 1212K +/- 11K(day)
T = 973K +/- 33K(night)
(Knutson et al. 2007)

5. measuring the spin-orbit alignment:
Johannes Koppenhöfer
Leiden
5/23
measuring the spin-orbit alignment:
209458b: l = -4.4o o
(Winn et al. 2005)
HD : l = -1.4o +/- 1.1o
(Winn et al. 2006)
HD149026b: l = -12o +- 15o
(Wolf et al. 2007)
HAT-P-2b: |l| < 14o
(Winn et al. 2007)
Rossiter-McLaughlin-Effect

6. transmission spectroscopy:
Johannes Koppenhöfer
Leiden
6/23
transmission spectroscopy:
209458b: detection of Na and H (Charbonneau et al. 2002)
detection of O and C (Vidal-Madjar et al 2004)

7. Transit Surveys: wide angle surveys: small apertures
Johannes Koppenhöfer
Leiden
7/23
Transit Surveys:
wide angle surveys: small apertures
bright stars, many fields
HAT-P, TrES, WASP, XO, TEST, ...
deep surveys: big apertures
faint stars, few fields
OGLE (GITPO, Pan-Planets, OmegaTranS, ...)
space surveys: bright and faint stars
outstanding photometric precision
detection of Earth-sized planets
SWEEPS, CoRoT, (Kepler, PLATO?, ...)

8. transit surveys at USM/MPE
Johannes Koppenhöfer
Leiden
8/23
transit surveys at USM/MPE
(Saglia, Koppenhöfer, Bender)
: Wendelstein Extra-Solar Planet Search (WESPS)
: OmegaTranS with (GTO)
(Sterrewacht Leiden / INAF Napoli)
: pre-OmegaTranS with
: Pan-Planets
(MPIA & Pan-Starrs consortium)
: OmegaTranS with (GTO)
(Leiden / Napoli)

9. transit surveys at USM/MPE
Johannes Koppenhöfer
Leiden
8/23
transit surveys at USM/MPE
(Saglia, Koppenhöfer, Bender)
: Wendelstein Extra-Solar Planet Search (WESPS)
: OmegaTranS with (GTO)
(Sterrewacht Leiden / INAF Napoli)
: pre-OmegaTranS with
: Pan-Planets
(MPIA & Pan-Starrs consortium)
: OmegaTranS with (GTO)
(Leiden / Napoli)

10. The data: 110h observation time
Johannes Koppenhöfer
Leiden
9/23
The data:
110h observation time
R-band (#844), 25-30s exposure time, 1.5min cycle
4418 science images, one WFI field
964 calibration images
0.8 TByte raw data (75% science / 25% calibrations)

11. overscan correction method:
Johannes Koppenhöfer
Leiden
10/23
overscan correction method:
oc=6 (default) oc=2 (y-smoothed) oc=10 (new)

12. overscan correction method:
Johannes Koppenhöfer
Leiden
10/23
overscan correction method:
oc=6 (default) oc=2 (y-smoothed) oc=10 (new)

13. hot, cold and bad pixels:
Johannes Koppenhöfer
Leiden
11/23
hot, cold and bad pixels:
=> additional masking necessary

14. Johannes Koppenhöfer
Leiden
12/23
astrometry:

15. astrometry vs. seeing: seeing [arcsec] seeing [arcsec]
Johannes Koppenhöfer
Leiden
13/23
astrometry vs. seeing:
seeing [arcsec]
seeing [arcsec]

16. Johannes Koppenhöfer
Leiden
14/23

17. rms of the lightcurves:
Johannes Koppenhöfer
Leiden
15/23
rms of the lightcurves:

18. correlated noise: Gaussian (white) noise: σw(N) ~ 1 / sqrt(N)
Johannes Koppenhöfer
Leiden
16/23
correlated noise:
Gaussian (white) noise:
σw(N) ~ 1 / sqrt(N)
correlated (red) noise:
σ(N) = sqrt( σw(N)2 + σr2)
Pont et al. 2005

19. removing red noise: method: sysrem proposed by Tamuz et al. (2006)
Johannes Koppenhöfer
Leiden
17/23
removing red noise:
method: sysrem proposed by Tamuz et al. (2006)
initial idea: correct for a color-dependent extinction residual rij
fit best colors ci:
fit best airmasses aj:
i: star index, j: image index

20. removing red noise: method: sysrem proposed by Tamuz et al. (2006)
Johannes Koppenhöfer
AIU Jena
1/36
removing red noise:
method: sysrem proposed by Tamuz et al. (2006)
initial idea: correct for color-dependent extinction
fit best colors ci:
fit best airmasses aj:
i: star index, j: image index

21. successful application of sysrem:
Johannes Koppenhöfer
Leiden
18/23
successful application of sysrem:
OGLE2-TR-L9:
OGLE-TR-182:
Snellen et al. 2007
Pont et al. 2007

22. Johannes Koppenhöfer
Leiden
19/23
red noise in WFI data:

23. Johannes Koppenhöfer
Leiden
20/23
lightcurve analysis:
method: Box-Least-Square fitting (BLS) proposed by Kovacs et al. 2002
SDE := (SRpeak - <SR>) / σSR
S/N = (ΔF/F) / σTransit
= (ΔF/F) * sqrt(N) / σ0
good candidates S/N > 10!!!
BLS scored best in a
blind test initiated by
Moutou et al. 2005

24. results: eclipsing binaries
Johannes Koppenhöfer
Leiden
21/23
results: eclipsing binaries

25. Computation times: single cpu 16x2 cluster 128x4 cluster
Johannes Koppenhöfer
Leiden
22/23
Computation times:
single cpu x2 cluster x4 cluster
Ingest h h h
Bias, Flat, etc h h h
Reduce h h h
Astrometry h h h
Regrid h h h
Reference h h h
MDia h h h
Total h h h

26. summary & discussion: parallel ingestion needed
Johannes Koppenhöfer
Leiden
23/23
summary & discussion:
parallel ingestion needed
-> already implemented?
new overscan correction method useful for WFI data
-> smoothing box size as process parameter?
for WFI it is highly recommended to add a functionality of bad pixel mask application
relative astrometry working good with rms ~0.03”
-> ready for check-in