![tricycle logo] (https://github.com/StellarArmy/tricycle/blob/master/plots/tricycle.gif)

3 Periods, 2 Stars, 1 Age

Looking through the Kepler eclipsing binaries, can we find systems with starspot signals from both stars? To find these, look for 3 distinct, non-harmonic, periods.

This would give rotation periods for both components (challenge goal: figure out which period comes from which star).

Follow-up spectroscopic observation then gives masses and radii.

Retrieving Light Curves

This requires access to the Kepler MySQL database on the UW network.

import loadlc_db as ldb
import get_lightcurves as glc
import matplotlib.pyplot as plt

'''Select systems with 10.0 < p_orbit < 10.5'''
kics = glc.select_kics(pmin=10.0, pmax=10.05)

'''This returns two KIC IDs'''

'''Examine the light curves'''
for kic in kics:
    time, flux, fluxerr, cadence, quarter, quality = ldb.loadlc_db(kic)
    plt.plot(time, flux)
    plt.show() 

Simulating Light Curves

Start by initializing an EB object, inputing the system parameters.

eb = tw.EB(p_orb=7.07, p_rot1=1.51, p_rot2=0.80, depth=0.5, amp_1=0.03, amp_2=0.02, e_dur=0.4)

Now make a light curve and plot.

time, flux = eb.make_lc(length=100, sig=0.02)
plt.plot(time, flux)
plt.xlim(0,11)
plt.ylim(0,1.2)
plt.xlabel('Time (days)')
plt.ylabel('Relative Flux')
plt.show()

![Example Light Curve] (https://github.com/StellarArmy/tricycle/blob/master/plots/lightcurve.png)

Parameters

---

• p_orb : float - Orbital period in days
• p_rot1 : float - Rotation period of star 1
• p_rot2 : float - Rotation period of star 2
• depth : float - Eclipse depth
• amp_1 : float - Spot amplitude of star 1
• amp 2 : Spot amplitude of star 2
• e_dur : Eclipse duration in days
• sc : Default is for long cadence, set to True for short cadence