Note
Go to the end to download the full example code.
Plot the lightcurve of a spotted star#
This example plots the lightcurve caused by a spotted photosphere.
from pathlib import Path
from astropy import units as u
import matplotlib.pyplot as plt
import libpypsg
from VSPEC import ObservationModel,PhaseAnalyzer
try:
CFG_PATH = Path(__file__).parent / 'spot_lightcurve.yaml'
except NameError:
CFG_PATH = 'spot_lightcurve.yaml'
libpypsg.docker.set_url_and_run()
Saved settings to /home/runner/.libpypsg/settings.json
Reloading settings...
Initialize the VSPEC run#
We read in the config file and run the model.
model = ObservationModel.from_yaml(CFG_PATH)
model.build_planet()
model.build_spectra()
/opt/hostedtoolcache/Python/3.11.10/x64/lib/python3.11/site-packages/VSPEC/main.py:89: RuntimeWarning: Planet sampling is too low (4.00 d > 1.25 d)
warnings.warn(msg, RuntimeWarning)
Starting at phase 0.0 deg, observe for 40.0 d in 10 steps
Phases = [ 0. 144. 288. 72. 216. 0. 144. 288. 72. 216. 0.] deg
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Generated 2 mature spots
Creating interpolators:
thermal
thermal, combined
thermal, combined, stellar
thermal, combined, stellar, photon noise
thermal, combined, stellar, photon noise, detector noise
thermal, combined, stellar, photon noise, detector noise, telescope noise
thermal, combined, stellar, photon noise, detector noise, telescope noise, background noise
thermal, combined, stellar, photon noise, detector noise, telescope noise, background noise, transit
Finished!
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Loading Spectra: 53%|█████▎ | 9/17 [00:29<00:26, 3.29s/it]PHOENIX grid for 3200 not found. Downloading...
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Loading Spectra: 59%|█████▉ | 10/17 [00:32<00:23, 3.30s/it]PHOENIX grid for 3300 not found. Downloading...
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Loading Spectra: 65%|██████▍ | 11/17 [00:35<00:19, 3.25s/it]PHOENIX grid for 3400 not found. Downloading...
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Loading Spectra: 71%|███████ | 12/17 [00:38<00:16, 3.21s/it]PHOENIX grid for 3500 not found. Downloading...
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Loading Spectra: 82%|████████▏ | 14/17 [00:45<00:09, 3.26s/it]PHOENIX grid for 3700 not found. Downloading...
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Build Spectra: 100%|██████████| 40/40 [01:36<00:00, 2.42s/it]
Load in the data#
We can use VSPEC to read in the synthetic data we just created.
data = PhaseAnalyzer(model.directories['all_model'])
/opt/hostedtoolcache/Python/3.11.10/x64/lib/python3.11/site-packages/VSPEC/analysis.py:116: RuntimeWarning: No Layer info, maybe globes or molecular signatures are off
warnings.warn(
Get the lightcurve#
We will look in a few different wavelengths.
wl_pixels = [0,300,500,700]
time = data.time.to(u.day)
for i in wl_pixels:
wl = data.wavelength[i]
lc = data.lightcurve(
source='star',
pixel=i,
normalize=0
)
plt.plot(time,lc,label=f'{wl:.1f}')
plt.legend()
plt.xlabel(f'time ({time.unit})')
_=plt.ylabel('Flux (normalized)')
Total running time of the script: (1 minutes 53.671 seconds)