Signal processing in Python for the detection and characterization of extrasolar planets
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1 Signal processing in Python for the detection and characterization of extrasolar planets Institut d astrophysique spatial Université Paris-Sud August 2011
2 1 Personal background
3 1 Personal background
4 Areas of research Science Extrasolar planets Stellar physics
5 Areas of research Science Extrasolar planets Stellar physics Techniques Adaptive optics Doppler spectrometry (radial velocimetry) High-precision photometry Long-baseline stellar interferometry
6 The choice of Python Frustrations with IDL 6.2 (2006) not (or poorly) interactive graphical windows for data inspection only low to moderate-quality graphics for publications failed to make a Fresnel-propagation library work properly costs more than a laptop
7 The choice of Python Frustrations with IDL 6.2 (2006) not (or poorly) interactive graphical windows for data inspection only low to moderate-quality graphics for publications failed to make a Fresnel-propagation library work properly costs more than a laptop Data-processing languages widely used for astronomy proprietay: IDL, Matlab open-source: Java, Python (promoted by the STScI), Scilab, Yorick...
8 1 Personal background
9 Transit of Mercury in front of the Sun Solar Heliospheric Observatory 7 May 2003
10 Transit of an exoplanet F F = ( ) 2 Rp R Jupiter 10 2 Earth 10 4
11 The Corot space mission Cnes mission + European partners + Brazil (165 M ) 27-cm diameter telescope, 3.5 o 2.8 o field of view 4 CCD detectors ( nm) Launched 27 Dec for 3+3 years Polar orbit at an altitude of 900 km Science: asteroseismology + exoplanets
12 Corot-2 light curve 78 transits in 152 days! Alonso et al., A&A 482, L21 (2008)
13 Corot-2b: transit and characteristics Average transit Planet s portrait Radius = ± R J Mass = 3.53 ± 0.24 M J Density = 1.50 ± 0.18 Period = ± d Semi-major axis = AU Host-star = G7 V
14 1 Personal background
15 Light curve prefiltering
16 Detection by matched-filtering
17 Fitting a trapezoid model
18 Individual transit check
19 Handling 10,000 light curves
20 1 Personal background
21 Corot-8b direct model
22 Corot-8b inverse model
23 1 Personal background
24 Recent and future work HTML output replaced by a MySQL database (done) Coding in C the cross-correlation function (future) PDF reports for every light curve using ReportLab (future)
25 Recent and future work HTML output replaced by a MySQL database (done) Coding in C the cross-correlation function (future) PDF reports for every light curve using ReportLab (future) Underway: implementation of a Bayesian approach with MCMC computations (PyMC?)
26 Recent and future work HTML output replaced by a MySQL database (done) Coding in C the cross-correlation function (future) PDF reports for every light curve using ReportLab (future) Underway: implementation of a Bayesian approach with MCMC computations (PyMC?) Notebooks in Python Have tried Sage and TeXmacs as Python interfaces to produce notebooks.
27 Python for teaching? For programming in L3?... C# chosen instead.
28 Python for teaching? For programming in L3?... C# chosen instead. For data display in L3?... Matlab chosen instead.
29 Python for teaching? For programming in L3?... C# chosen instead. For data display in L3?... Matlab chosen instead. For signal processing in M1?... Matlab chosen instead.
30 Python for teaching? For programming in L3?... C# chosen instead. For data display in L3?... Matlab chosen instead. For signal processing in M1?... Matlab chosen instead. Signal processing in M2?... Yes! using Pylab and IPython.
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