def get_measured_temperature(self, starname, date, Tmax, instrument=None, N=7, addmode='simple', feh=None, vsini=None):
"""
Get the measured temperature by doing a weighted sum over temperatures near the given one (which I find by hand)
:param starname: The name of the star
:param Tmax: The temperature to search near
:param date: The date the observation was taken
:param instrument: The instrument used (this function automatically finds it if not given)
:param N: The number of temperature points to take
:param addmode: The way the individual order CCFs were co-added.
:param feh: The metallicity to use. If not given, it finds whatever gives the highest ccf peak.
:param vsini: The vsini to use. If not given, it finds whatever gives the highest ccf peak.
:return: A pandas DataFrame with the starname, date, instrument, and model parameters for the
temperatures near the requested one
"""
if instrument is None:
# Find this star/date in all of the interfaces
found = False
df_list = []
for inst in self._interfaces.keys():
interface = self._interfaces[inst]
if starname in interface.list_stars() and date in interface.list_dates(starname):
found = True
df = self.get_measured_temperature(starname, date, Tmax, instrument=inst, N=N)
df_list.append(df)
if not found:
warnings.warn('Star ({}) not found for date ({}) in any CCF interfaces!'.format(starname, date))
return None
return pd.concat(df_list, ignore_index=True)
# Check that the star/date combination are in the requested interface
if starname not in self._interfaces[instrument].list_stars():
raise KeyError('Star ({}) not in instrument ({})'.format(starname, instrument))
if date not in self._interfaces[instrument].list_dates(starname):
# Try date +/- 1 before failing (in case of civil/UT date mismatch or something)
from datetime import datetime, timedelta
year, month, day = [int(s) for s in date.split('-')]
for inc in [-1, 1]:
t = datetime(year, month, day) + timedelta(inc)
test_date = '{}-{:02d}-{:02d}'.format(t.year, t.month, t.day)
if test_date in self._interfaces[instrument].list_dates(starname):
return self.get_measured_temperature(starname, test_date, Tmax,
instrument=instrument, N=N, addmode=addmode)
raise KeyError(
'Date ({}) not in CCF interface for star {} and instrument {}'.format(date, starname, instrument))
# Get CCF information from the requested instrument/star/date combo
interface = self._interfaces[instrument]
logging.info('{}, {}, {}, {}'.format(starname, date, instrument, addmode))
df = interface._compile_data(starname=starname, date=date, addmode=addmode, read_ccf=True)
#df['ccf_max'] = df.ccf.map(np.max) Already done now
# Get the parameters and RV of the CCF with the highest peak (which has temperature = Tmax)
#print(df)
requested = df.loc[df['T'] == Tmax]
if feh is not None:
requested = requested.loc[requested['[Fe/H]'] == feh]
if vsini is not None:
requested = requested.loc[requested['vsini'] == vsini]
i = np.argmax(requested.ccf_max)
vsini = requested.loc[i, 'vsini'].item()
metal = requested.loc[i, '[Fe/H]'].item()
logg = requested.loc[i, 'logg'].item()
idx = requested.loc[i, 'ccf'].argmax()
rv = interface.velocities[idx]
# Now, get the CCF height for the N/2 temperatures on either side of Tmax
N = roundodd(N)
d = defaultdict(list)
for T in np.arange(Tmax - 100 * (N - 1) / 2, Tmax + 100 * (N - 1) / 2 + 1, 100):
requested = df.loc[(df['T'] == T) & (df.vsini == vsini) &
(df['[Fe/H]'] == metal) & (df.logg == logg)]
if len(requested) == 0:
warnings.warn('No matches for T = {} with star/date = {}/{}!'.format(T, starname, date))
d['Star'].append(starname)
d['Date'].append(date)
d['Instrument'].append(instrument)
d['Temperature'].append(T)
d['vsini'].append(vsini)
d['logg'].append(logg)
d['[Fe/H]'].append(metal)
d['rv'].append(rv)
d['CCF'].append(np.nan)
d['significance'].append(np.nan)
continue
if len(requested) > 1:
requested = requested.sort_values(by='ccf_max').tail(1)
# Save the best parameters for this temperature
d['Star'].append(starname)
d['Date'].append(date)
d['Instrument'].append(instrument)
d['Temperature'].append(T)
d['vsini'].append(requested['vsini'].item())
d['logg'].append(requested['logg'].item())
d['[Fe/H]'].append(requested['[Fe/H]'].item())
idx = np.argmin(np.abs(interface.velocities - rv))
d['rv'].append(rv)
ccf = requested['ccf'].item()
d['CCF'].append(ccf[idx])
# Measure the detection significance
std = mad(ccf)
mean = np.median(ccf)
d['significance'].append((d['CCF'][-1] - mean) / std)
# Do the weighted sum.
summary = CCF_Systematics.get_Tmeas(pd.DataFrame(data=d), include_actual=False)
# Put the star, date, and instrument back in the dataframe before returning
summary['Star'] = starname
summary['Date'] = date
summary['Instrument'] = instrument
summary['addmode'] = addmode
return summary
def find_best_pars(df, velocity='highest', vel_arr=np.arange(-900.0, 900.0, 0.1), N=1):
"""
Find the 'best-fit' parameters for each combination of primary and secondary star
:param df: the dataframe to search in
:keyword velocity: The velocity to measure the CCF at. The default is 'highest', and uses the maximum of the ccf
:keyword vel_arr: The velocities to interpolate each ccf at
:keyword N: The number of parameters to return
:return: a dataframe with keys of primary, secondary, and the parameters
"""
# Make sure N is odd
if N % 2 == 0:
logging.warn('N must be an odd number. Changing N from {} --> {}'.format(N, N + 1))
N += 1
# Get the names of the primary and secondary stars
primary_names = pd.unique(df.Primary)
secondary_names = pd.unique(df.Secondary)
# Find the ccf value at the given velocity
def val_fcn(ccf, idx=None, search_indices=None):
if idx is None:
if search_indices is None:
idx = np.argmax(ccf)
else:
idx = np.argmax(ccf[search_indices])
idx = search_indices[idx]
rv = vel_arr[idx]
sigma = np.std(ccf[np.abs(vel_arr - rv) > 200])
return ccf[idx], ccf[idx] / sigma, rv
if velocity == 'highest':
vals = df['CCF'].map(val_fcn)
df['ccf_max'] = vals.map(lambda l: l[0])
df['significance'] = vals.map(lambda l: l[1])
df['rv'] = vals.map(lambda l: l[2])
else:
# idx = np.argmin(np.abs(vel_arr - velocity))
idx = np.where(np.abs(vel_arr - velocity) <= 5)[0]
vals = df['CCF'].map(lambda c: val_fcn(c, search_indices=idx))
df['ccf_max'] = vals.map(lambda l: l[0])
df['significance'] = vals.map(lambda l: l[1])
df['rv'] = vals.map(lambda l: l[2])
#print(df[['Secondary', 'rv']])
# Find the best parameter for each combination
d = defaultdict(list)
groups = df.groupby(('Primary', 'Secondary'))
for group in groups.groups.keys():
primary = group[0]
secondary = group[1]
g = groups.get_group(group)
best = g.loc[g.ccf_max == g.ccf_max.max()]
T = best['Temperature'].item()
vsini = best['vsini'].item()
logg = best['logg'].item()
metal = best['[Fe/H]'].item()
rv = best['rv'].item()
Tmin = T - (N - 1) * 50
Tmax = T + (N - 1) * 50
for Ti in range(Tmin, Tmax + 1, 100):
good = g.loc[
(g['Temperature'] == Ti) & (g['vsini'] == vsini) & (g['logg'] == logg) & (g['[Fe/H]'] == metal)]
if len(good) == 0:
logging.warn('No matches for T = {} with primary/secondary = {}/{}!'.format(Ti, primary, secondary))
d['Primary'].append(primary)
d['Secondary'].append(secondary)
d['Temperature'].append(Ti)
d['vsini'].append(vsini)
d['logg'].append(logg)
d['[Fe/H]'].append(metal)
d['rv'].append(rv)
d['CCF'].append(np.nan)
d['significance'].append(np.nan)
continue
# print len(good)
best = good.loc[good.ccf_max == good.ccf_max.max()]
#best = good
if len(best) != 1 or any(np.isnan(best['CCF'].item())):
print best
print good
print good.ccf_max
print good.ccf_max.max()
continue
# Save the best parameters for this temperature
d['Primary'].append(primary)
d['Secondary'].append(secondary)
d['Temperature'].append(best['Temperature'].item())
d['vsini'].append(best['vsini'].item())
d['logg'].append(best['logg'].item())
d['[Fe/H]'].append(best['[Fe/H]'].item())
idx = np.argmin(np.abs(vel_arr - rv))
d['rv'].append(rv)
d['CCF'].append(best['CCF'].item()[idx])
# d['rv'].append(best['rv'].item())
#d['CCF'].append(best.ccf_max.item())
# Measure the detection significance
std = mad(best.CCF.item())
mean = np.median(best.CCF.item())
d['significance'].append((d['CCF'][-1] - mean) / std)
return pd.DataFrame(data=d)
