def fluxTrans(intens, flx, lambdas, cosTheta, radius, iFirstTheta,
numTransThetas, rPlanet):
#print("iFirstTheta ", iFirstTheta, " numTransThetas ", numTransThetas,\
# " rPlanet ", rPlanet)
#//console.log("Entering flux3");
logTiny = -49.0
tiny = math.exp(logTiny)
logPi = math.log(math.pi)
numLams = len(lambdas)
numThetas = len(cosTheta[0])
fluxTransSpec = [[[numpy.double(0.0) for i in range(numTransThetas)]
for k in range(numLams)] for j in range(2)]
#Earth-radii to solar radii:
rPlanet = numpy.double(rPlanet)
rPlanet = rPlanet * Useful.rEarth() / Useful.rSun()
#dPlanet = 2.0 * rPlanet
#print("dPlanet ", dPlanet)
#subtract off flux eclipsed by transiting planet:
#thisImpct = rPlanet #Default
##Can it really be this simple??:
logOmega = math.log(math.pi) + (numpy.double(2.0) *
(math.log(rPlanet) - math.log(radius)))
#omega = math.exp(logOmega)
#print("omega ", omega)
helper = 0.0
logHelper = 0.0
for it in range(iFirstTheta, numThetas):
for il in range(numLams):
#Subtracting the very small from the very large - let's be sophisticated about it:
logHelper = logPi + math.log(
intens[il][it]) + logOmega - flx[1][il]
helper = numpy.double(1.0) - math.exp(logHelper)
#if (fluxTransSpec[0][il][it-iFirstTheta] > tiny):
fluxTransSpec[1][il][it -
iFirstTheta] = flx[1][il] + math.log(helper)
#if (il == 150):
# print("logHelper ", logHelper, " helper ", helper, " logFluxTransSpec ", logFluxTransSpec)
fluxTransSpec[0][il][it - iFirstTheta] = math.exp(
fluxTransSpec[1][il][it - iFirstTheta])
#if (il == 150):
# print("fluxTransSpec 2 ", fluxTransSpec[0][il][it-iFirstTheta])
#plt.plot(cosTheta[1][iFirstTheta: iFirstTheta+numTransThetas],\
# )
return fluxTransSpec
def TransLight2(radius, cosTheta, vTrans, iFirstTheta, numTransThetas, impct):
#Safety first:
tiny = numpy.double(1.0e-49)
logTiny = math.log(tiny)
if (impct >= radius):
#There is no eclipse (transit)
return
#thetaMinRad is also the minimum theta of the eclipse path chord, in RAD
thetaMinRad = math.asin(impct / radius)
#cos(theta) *decreases* with increasing theta in Quadrant I:
cosThetaMax = math.cos(thetaMinRad)
#Compute array of distances traveled, r, along semi-chord from position of
#minimum impact parameter
#12D array of length number-of-eclipse-thetas
transit = [0.0 for i in range(numTransThetas)]
#test = [0.0 for i in range(numThetas)]
thisImpct = numpy.double(0.0)
for i in range(numTransThetas):
#print("i ", i)
thisTheta = math.acos(cosTheta[1][i + iFirstTheta])
thisImpct = radius * math.sin(thisTheta)
#test[i+iFirstTheta] = math.exp(logRatio)
# impact parameter corresponding to this theta:
thisB = radius * math.sin(thisTheta)
# linear distance travelled along transit semi-path in solar radii
transit[i] = math.sqrt(thisB**2 - impct**2)
transit[i] = transit[i] * Useful.rSun() #RSun to cm
#row 1 is Times at which successive annuli are eclipsed, in s:
#Ephemeris zero point at transit mid-point
transit[i] = transit[i] / vTrans
#print("i ", i, " i+iFirstTheta ", i+iFirstTheta, " transit[1] ", transit[1][i+iFirstTheta])
return transit
