Let's first make sure we have the latest version of PHOEBE 2.1 installed. (You can comment out this line if you don't use pip for your installation or don't want to update to the latest release).
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!pip install -I "phoebe>=2.1,<2.2"
As always, let's do imports and initialize a logger and a new bundle. See Building a System for more details.
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%matplotlib inline
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import phoebe
from phoebe import u # units
import numpy as np
import matplotlib.pyplot as plt
logger = phoebe.logger()
Here we'll initialize a default binary, but ask for it to be created as a contact system.
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b_cb = phoebe.default_binary(contact_binary=True)
We'll compare this to the default detached binary
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b_detached = phoebe.default_binary()
Let's first look at the hierarchy of the default detached binary, and then compare that to the hierarchy of the overcontact system
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print b_detached.hierarchy
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print b_cb.hierarchy
As you can see, the overcontact system has an additional "component" with method "envelope" and component label "contact_envelope".
Next let's look at the parameters in the envelope and star components. You can see that most of parameters in the envelope class are constrained, while the equivalent radius of the primary is unconstrained. The value of primary equivalent radius constrains the potential and fillout factor of the envelope, as well as the equivalent radius of the secondary.
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print b_cb.filter(component='contact_envelope', kind='envelope', context='component')
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print b_cb.filter(component='primary', kind='star', context='component')
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b_cb['requiv@primary'] = 1.5
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b_cb['pot@contact_envelope@component']
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b_cb['fillout_factor@contact_envelope@component']
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b_cb['requiv@secondary@component']
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Now, of course, if we didn't originally know we wanted a contact binary and built the default detached system, we could still turn it into an contact binary just by changing the hierarchy.
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b_detached.add_component('envelope', component='contact_envelope')
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hier = phoebe.hierarchy.binaryorbit(b_detached['binary'], b_detached['primary'], b_detached['secondary'], b_detached['contact_envelope'])
print hier
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b_detached.set_hierarchy(hier)
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print b_detached.hierarchy
However, since our system was detached, the system is not overflowing, and therefore doesn't pass system checks
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b_detached.run_checks()
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And because of this, the potential and requiv@secondary constraints cannot be computed
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b_detached['pot@component']
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b_detached['requiv@secondary@component']
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Likewise, we can make a contact system detached again simply by removing the envelope from the hierarchy. The parameters themselves will still exist (unless you remove them), so you can always just change the hierarchy again to change back to an overcontact system.
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hier = phoebe.hierarchy.binaryorbit(b_detached['binary'], b_detached['primary'], b_detached['secondary'])
print hier
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b_detached.set_hierarchy(hier)
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print b_detached.hierarchy
Although the constraints have been removed, PHOEBE has lost the original value of the secondary radius (because of the failed contact constraints), so we'll have to reset that here as well.
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b_detached['requiv@secondary'] = 1.0
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b_cb.add_dataset('mesh', times=[0], dataset='mesh01')
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b_cb.add_dataset('orb', times=np.linspace(0,1,201), dataset='orb01')
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b_cb.add_dataset('lc', times=np.linspace(0,1,21), dataset='lc01')
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b_cb.add_dataset('rv', times=np.linspace(0,1,21), dataset='rv01')
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For comparison, we'll do the same to our detached system
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b_detached.add_dataset('mesh', times=[0], dataset='mesh01')
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b_detached.add_dataset('orb', times=np.linspace(0,1,201), dataset='orb01')
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b_detached.add_dataset('lc', times=np.linspace(0,1,21), dataset='lc01')
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b_detached.add_dataset('rv', times=np.linspace(0,1,21), dataset='rv01')
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b_cb.run_compute(irrad_method='none')
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b_detached.run_compute(irrad_method='none')
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To ensure compatibility with computing synthetics in detached and semi-detached systems in Phoebe, the synthetic meshes for our overcontact system are attached to each component separetely, instead of the contact envelope.
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print b_cb['mesh01@model'].components
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print b_detached['mesh01@model'].components
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afig, mplfig = b_cb['mesh01@model'].plot(x='ws', show=True)
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afig, mplfig = b_detached['mesh01@model'].plot(x='ws', show=True)
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afig, mplfig = b_cb['orb01@model'].plot(x='ws',show=True)
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afig, mplfig = b_detached['orb01@model'].plot(x='ws',show=True)
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afig, mplfig = b_cb['lc01@model'].plot(show=True)
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afig, mplfig = b_detached['lc01@model'].plot(show=True)
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afig, mplfig = b_cb['rv01@model'].plot(show=True)
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afig, mplfig = b_detached['rv01@model'].plot(show=True)
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