def resample_spectrum(
self,
wavel_points: np.ndarray,
model_param: Optional[Dict[str, float]] = None,
spec_res: Optional[float] = None,
apply_mask: bool = False,
) -> box.SpectrumBox:
"""
Function for resampling the spectrum and optional uncertainties
onto a new wavelength grid.
Parameters
----------
wavel_points : np.ndarray
Wavelengths (um).
model_param : dict, None
Dictionary with the model parameters, which should only
contain the ``'scaling'`` keyword. No scaling is applied if
the argument of ``model_param`` is set to ``None``.
spec_res : float, None
Spectral resolution that is used for smoothing the spectrum
before resampling the wavelengths. No smoothing is applied
if the argument is set to ``None``. The smoothing can only
be applied ti spectra with a constant spectral resolution
(which is the case for all model spectra that are
compatible with ``species``) or a constant wavelength
spacing. The first smoothing approach is fastest.
apply_mask : bool
Exclude negative values and NaNs.
Returns
-------
species.core.box.SpectrumBox
Box with the resampled spectrum.
"""
calibbox = self.get_spectrum(apply_mask=apply_mask)
if spec_res is not None:
calibbox.flux = read_util.smooth_spectrum(
wavelength=calibbox.wavelength,
flux=calibbox.flux,
spec_res=spec_res)
flux_new, error_new = spectres.spectres(
wavel_points,
calibbox.wavelength,
calibbox.flux,
spec_errs=calibbox.error,
fill=0.0,
verbose=False,
)
if model_param is not None:
flux_new = model_param["scaling"] * flux_new
error_new = model_param["scaling"] * error_new
return box.create_box(
boxtype="spectrum",
spectrum="calibration",
wavelength=wavel_points,
flux=flux_new,
error=error_new,
name=self.tag,
)
def get_spectrum(self,
model_param: Dict[str, Union[float, List[float]]],
spec_res: float,
smooth: bool = False) -> box.ModelBox:
"""
Function for calculating a Planck spectrum or a combination of multiple Planck spectra.
Parameters
----------
model_param : dict
Dictionary with the 'teff' (K), 'radius' (Rjup), and 'distance' (pc). The values
of 'teff' and 'radius' can be a single float, or a list with floats for a combination
of multiple Planck functions, e.g.
{'teff': [1500., 1000.], 'radius': [1., 2.], 'distance': 10.}.
spec_res : float
Spectral resolution.
smooth : bool
Returns
-------
species.core.box.ModelBox
Box with the Planck spectrum.
"""
if 'teff' in model_param and isinstance(model_param['teff'], list):
model_param = self.update_parameters(model_param)
wavel_points = read_util.create_wavelengths(self.wavel_range, spec_res)
n_planck = 0
for item in model_param:
if item[:4] == 'teff':
n_planck += 1
if n_planck == 1:
if 'radius' in model_param and 'distance' in model_param:
scaling = ((model_param['radius']*constants.R_JUP) /
(model_param['distance']*constants.PARSEC))**2
else:
scaling = 1.
flux = self.planck(wavel_points,
model_param['teff'],
scaling) # (W m-2 um-1)
else:
flux = np.zeros(wavel_points.shape)
for i in range(n_planck):
if f'radius_{i}' in model_param and 'distance' in model_param:
scaling = ((model_param[f'radius_{i}']*constants.R_JUP) /
(model_param['distance']*constants.PARSEC))**2
else:
scaling = 1.
flux += self.planck(wavel_points,
model_param[f'teff_{i}'],
scaling) # (W m-2 um-1)
if smooth:
flux = read_util.smooth_spectrum(wavel_points, flux, spec_res)
model_box = box.create_box(boxtype='model',
model='planck',
wavelength=wavel_points,
flux=flux,
parameters=model_param,
quantity='flux')
if n_planck == 1 and 'radius' in model_param:
model_box.parameters['luminosity'] = 4. * np.pi * (
model_box.parameters['radius'] * constants.R_JUP)**2 * constants.SIGMA_SB * \
model_box.parameters['teff']**4. / constants.L_SUN # (Lsun)
elif n_planck > 1:
lum_total = 0.
for i in range(n_planck):
if f'radius_{i}' in model_box.parameters:
# Add up the luminosity of the blackbody components (Lsun)
surface = 4. * np.pi * (model_box.parameters[f'radius_{i}']*constants.R_JUP)**2
lum_total += surface * constants.SIGMA_SB * \
model_box.parameters[f'teff_{i}']**4. / constants.L_SUN
if lum_total > 0.:
model_box.parameters['luminosity'] = lum_total
return model_box
def spectral_type(
self,
tag: str,
spec_library,
wavel_range: Optional[Tuple[Optional[float], Optional[float]]] = None,
sptypes: Optional[List[str]] = None,
av_ext: Optional[Union[List[float], np.array]] = None,
rad_vel: Optional[Union[List[float], np.array]] = None,
) -> None:
"""
Method for finding the best fitting empirical spectra from a selected library by
evaluating the goodness-of-fit statistic from Cushing et al. (2008).
Parameters
----------
tag : str
Database tag where for each spectrum from the spectral library the best-fit parameters
will be stored. So when testing a range of values for ``av_ext`` and ``rad_vel``, only
the parameters that minimize the goodness-of-fit statistic will be stored.
spec_library : str
Name of the spectral library ('irtf', 'spex', 'kesseli+2017', 'bonnefoy+2014').
wavel_range : tuple(float, float), None
Wavelength range (um) that is used for the empirical comparison.
sptypes : list(str), None
List with spectral types to compare with. The list should only contains types, for
example ``sptypes=['M', 'L']``. All available spectral types in the ``spec_library``
are compared with if set to ``None``.
av_ext : list(float), np.array, None
List of A_V extinctions for which the goodness-of-fit statistic is tested. The
extinction is calculated with the empirical relation from Cardelli et al. (1989).
rad_vel : list(float), np.array, None
List of radial velocities (km s-1) for which the goodness-of-fit statistic is tested.
Returns
-------
NoneType
None
"""
w_i = 1.0
if av_ext is None:
av_ext = [0.0]
if rad_vel is None:
rad_vel = [0.0]
h5_file = h5py.File(self.database, "r")
try:
h5_file[f"spectra/{spec_library}"]
except KeyError:
h5_file.close()
species_db = database.Database()
species_db.add_spectra(spec_library)
h5_file = h5py.File(self.database, "r")
# Read object spectra and resolution
obj_spec = []
obj_res = []
for item in self.spec_name:
obj_spec.append(self.object.get_spectrum()[item][0])
obj_res.append(self.object.get_spectrum()[item][3])
# Read inverted covariance matrix
# obj_inv_cov = self.object.get_spectrum()[self.spec_name][2]
# Create empty lists for results
name_list = []
spt_list = []
gk_list = []
ck_list = []
av_list = []
rv_list = []
print_message = ""
# Start looping over library spectra
for i, item in enumerate(h5_file[f"spectra/{spec_library}"]):
# Read spectrum spectral type from library
dset = h5_file[f"spectra/{spec_library}/{item}"]
if isinstance(dset.attrs["sptype"], str):
item_sptype = dset.attrs["sptype"]
else:
# Use decode for backward compatibility
item_sptype = dset.attrs["sptype"].decode("utf-8")
if item_sptype == "None":
continue
if sptypes is None or item_sptype[0] in sptypes:
# Convert HDF5 dataset into numpy array
spectrum = np.asarray(dset)
if wavel_range is not None:
# Select subset of the spectrum
if wavel_range[0] is None:
indices = np.where(
(spectrum[:, 0] < wavel_range[1]))[0]
elif wavel_range[1] is None:
indices = np.where(
(spectrum[:, 0] > wavel_range[0]))[0]
else:
indices = np.where((spectrum[:, 0] > wavel_range[0])
& (spectrum[:,
0] < wavel_range[1]))[0]
if len(indices) == 0:
raise ValueError(
"The selected wavelength range does not cover any "
"wavelength points of the input spectrum. Please "
"use a broader range as argument of 'wavel_range'."
)
spectrum = spectrum[indices, ]
empty_message = len(print_message) * " "
print(f"\r{empty_message}", end="")
print_message = f"Processing spectra... {item}"
print(f"\r{print_message}", end="")
# Loop over all values of A_V and RV that will be tested
for av_item in av_ext:
for rv_item in rad_vel:
for j, spec_item in enumerate(obj_spec):
# Dust extinction
ism_ext = dust_util.ism_extinction(
av_item, 3.1, spectrum[:, 0])
flux_scaling = 10.0**(-0.4 * ism_ext)
# Shift wavelengths by RV
wavel_shifted = (spectrum[:, 0] + spectrum[:, 0] *
1e3 * rv_item / constants.LIGHT)
# Smooth spectrum
flux_smooth = read_util.smooth_spectrum(
wavel_shifted,
spectrum[:, 1] * flux_scaling,
spec_res=obj_res[j],
force_smooth=True,
)
# Interpolate library spectrum to object wavelengths
interp_spec = interp1d(
spectrum[:, 0],
flux_smooth,
kind="linear",
fill_value="extrapolate",
)
indices = np.where(
(spec_item[:, 0] > np.amin(spectrum[:, 0]))
& (spec_item[:, 0] < np.amax(spectrum[:,
0])))[0]
flux_resample = interp_spec(spec_item[indices, 0])
c_numer = (w_i * spec_item[indices, 1] *
flux_resample /
spec_item[indices, 2]**2)
c_denom = (w_i * flux_resample**2 /
spec_item[indices, 2]**2)
if j == 0:
g_k = 0.0
c_k_spec = []
c_k = np.sum(c_numer) / np.sum(c_denom)
c_k_spec.append(c_k)
chi_sq = (spec_item[indices, 1] - c_k *
flux_resample) / spec_item[indices, 2]
g_k += np.sum(w_i * chi_sq**2)
# obj_inv_cov_crop = obj_inv_cov[indices, :]
# obj_inv_cov_crop = obj_inv_cov_crop[:, indices]
# g_k = np.dot(spec_item[indices, 1]-c_k*flux_resample,
# np.dot(obj_inv_cov_crop,
# spec_item[indices, 1]-c_k*flux_resample))
# Append to the lists of results
name_list.append(item)
spt_list.append(item_sptype)
gk_list.append(g_k)
ck_list.append(c_k_spec)
av_list.append(av_item)
rv_list.append(rv_item)
empty_message = len(print_message) * " "
print(f"\r{empty_message}", end="")
print("\rProcessing spectra... [DONE]")
h5_file.close()
name_list = np.asarray(name_list)
spt_list = np.asarray(spt_list)
gk_list = np.asarray(gk_list)
ck_list = np.asarray(ck_list)
av_list = np.asarray(av_list)
rv_list = np.asarray(rv_list)
sort_index = np.argsort(gk_list)
name_list = name_list[sort_index]
spt_list = spt_list[sort_index]
gk_list = gk_list[sort_index]
ck_list = ck_list[sort_index]
av_list = av_list[sort_index]
rv_list = rv_list[sort_index]
name_select = []
spt_select = []
gk_select = []
ck_select = []
av_select = []
rv_select = []
for i, item in enumerate(name_list):
if item not in name_select:
name_select.append(item)
spt_select.append(spt_list[i])
gk_select.append(gk_list[i])
ck_select.append(ck_list[i])
av_select.append(av_list[i])
rv_select.append(rv_list[i])
print("Best-fitting spectra:")
if len(gk_select) < 10:
for i, gk_item in enumerate(gk_select):
print(
f" {i+1:2d}. G = {gk_item:.2e} -> {name_select[i]}, {spt_select[i]}, "
f"A_V = {av_select[i]:.2f}, RV = {rv_select[i]:.0f} km/s,\n"
f" scalings = {ck_select[i]}")
else:
for i in range(10):
print(
f" {i+1:2d}. G = {gk_select[i]:.2e} -> {name_select[i]}, {spt_select[i]}, "
f"A_V = {av_select[i]:.2f}, RV = {rv_select[i]:.0f} km/s,\n"
f" scalings = {ck_select[i]}")
species_db = database.Database()
species_db.add_empirical(
tag=tag,
names=name_select,
sptypes=spt_select,
goodness_of_fit=gk_select,
flux_scaling=ck_select,
av_ext=av_select,
rad_vel=rv_select,
object_name=self.object_name,
spec_name=self.spec_name,
spec_library=spec_library,
)
def get_model(self,
model_param: Dict[str, float],
spec_res: Optional[float] = None,
wavel_resample: Optional[np.ndarray] = None,
magnitude: bool = False,
smooth: bool = False) -> box.ModelBox:
"""
Function for extracting a model spectrum by linearly interpolating the model grid.
Parameters
----------
model_param : dict
Dictionary with the model parameters and values. The values should be within the
boundaries of the grid. The grid boundaries of the spectra in the database can be
obtained with :func:`~species.read.read_model.ReadModel.get_bounds()`.
spec_res : float, None
Spectral resolution that is used for smoothing the spectrum with a Gaussian kernel
when ``smooth=True`` and/or resampling the spectrum when ``wavel_range`` of
``FitModel`` is not ``None``. The original wavelength points are used if both
``spec_res`` and ``wavel_resample`` are set to ``None``, or if ``smooth`` is set to
``True``.
wavel_resample : np.ndarray, None
Wavelength points (um) to which the spectrum is resampled. In that case, ``spec_res``
can still be used for smoothing the spectrum with a Gaussian kernel.
magnitude : bool
Normalize the spectrum with a flux calibrated spectrum of Vega and return the magnitude
instead of flux density.
smooth : bool
If ``True``, the spectrum is smoothed with a Gaussian kernel to the spectral resolution
of ``spec_res``. This requires either a uniform spectral resolution of the input
spectra (fast) or a uniform wavelength spacing of the input spectra (slow).
Returns
-------
species.core.box.ModelBox
Box with the model spectrum.
"""
if smooth and spec_res is None:
warnings.warn('The \'spec_res\' argument is required for smoothing the spectrum when '
'\'smooth\' is set to True.')
grid_bounds = self.get_bounds()
extra_param = ['radius', 'distance', 'mass', 'luminosity', 'lognorm_radius',
'lognorm_sigma', 'lognorm_ext', 'ism_ext', 'ism_red', 'powerlaw_max',
'powerlaw_exp', 'powerlaw_ext']
for key in self.get_parameters():
if key not in model_param.keys():
raise ValueError(f'The \'{key}\' parameter is required by \'{self.model}\'. '
f'The mandatory parameters are {self.get_parameters()}.')
if model_param[key] < grid_bounds[key][0]:
raise ValueError(f'The input value of \'{key}\' is smaller than the lower '
f'boundary of the model grid ({model_param[key]} < '
f'{grid_bounds[key][0]}).')
if model_param[key] > grid_bounds[key][1]:
raise ValueError(f'The input value of \'{key}\' is larger than the upper '
f'boundary of the model grid ({model_param[key]} > '
f'{grid_bounds[key][1]}).')
for key in model_param.keys():
if key not in self.get_parameters() and key not in extra_param:
warnings.warn(f'The \'{key}\' parameter is not required by \'{self.model}\' so '
f'the parameter will be ignored. The mandatory parameters are '
f'{self.get_parameters()}.')
if 'mass' in model_param and 'radius' not in model_param:
mass = 1e3 * model_param['mass'] * constants.M_JUP # (g)
radius = math.sqrt(1e3 * constants.GRAVITY * mass / (10.**model_param['logg'])) # (cm)
model_param['radius'] = 1e-2 * radius / constants.R_JUP # (Rjup)
if self.spectrum_interp is None:
self.interpolate_model()
if self.wavel_range is None:
wl_points = self.get_wavelengths()
self.wavel_range = (wl_points[0], wl_points[-1])
parameters = []
if 'teff' in model_param:
parameters.append(model_param['teff'])
if 'logg' in model_param:
parameters.append(model_param['logg'])
if 'feh' in model_param:
parameters.append(model_param['feh'])
if 'co' in model_param:
parameters.append(model_param['co'])
if 'fsed' in model_param:
parameters.append(model_param['fsed'])
flux = self.spectrum_interp(parameters)[0]
if 'radius' in model_param:
model_param['mass'] = read_util.get_mass(model_param['logg'], model_param['radius'])
if 'distance' in model_param:
scaling = (model_param['radius']*constants.R_JUP)**2 / \
(model_param['distance']*constants.PARSEC)**2
flux *= scaling
if smooth:
flux = read_util.smooth_spectrum(wavelength=self.wl_points,
flux=flux,
spec_res=spec_res)
if wavel_resample is not None:
flux = spectres.spectres(wavel_resample,
self.wl_points,
flux,
spec_errs=None,
fill=np.nan,
verbose=True)
elif spec_res is not None and not smooth:
index = np.where(np.isnan(flux))[0]
if index.size > 0:
raise ValueError('Flux values should not contains NaNs. Please make sure that '
'the parameter values and the wavelength range are within '
'the grid boundaries as stored in the database.')
wavel_resample = read_util.create_wavelengths(
(self.wl_points[0], self.wl_points[-1]), spec_res)
indices = np.where((wavel_resample > self.wl_points[0]) &
(wavel_resample < self.wl_points[-2]))[0]
wavel_resample = wavel_resample[indices]
flux = spectres.spectres(wavel_resample,
self.wl_points,
flux,
spec_errs=None,
fill=np.nan,
verbose=True)
if magnitude:
quantity = 'magnitude'
with h5py.File(self.database, 'r') as h5_file:
try:
h5_file['spectra/calibration/vega']
except KeyError:
h5_file.close()
species_db = database.Database()
species_db.add_spectrum('vega')
h5_file = h5py.File(self.database, 'r')
readcalib = read_calibration.ReadCalibration('vega', filter_name=None)
calibbox = readcalib.get_spectrum()
if wavel_resample is not None:
new_spec_wavs = wavel_resample
else:
new_spec_wavs = self.wl_points
flux_vega, _ = spectres.spectres(new_spec_wavs,
calibbox.wavelength,
calibbox.flux,
spec_errs=calibbox.error,
fill=np.nan,
verbose=True)
flux = -2.5*np.log10(flux/flux_vega)
else:
quantity = 'flux'
if np.isnan(np.sum(flux)):
warnings.warn(f'The resampled spectrum contains {np.sum(np.isnan(flux))} NaNs, '
f'probably because the original wavelength range does not fully '
f'encompass the new wavelength range. The happened with the '
f'following parameters: {model_param}.')
if wavel_resample is None:
wavelength = self.wl_points
else:
wavelength = wavel_resample
# is_finite = np.where(np.isfinite(flux))[0]
#
# if wavel_resample is None:
# wavelength = self.wl_points[is_finite]
# else:
# wavelength = wavel_resample[is_finite]
#
# if wavelength.shape[0] == 0:
# raise ValueError(f'The model spectrum is empty. Perhaps the grid could not be '
# f'interpolated at {model_param} because zeros are stored in the '
# f'database.')
model_box = box.create_box(boxtype='model',
model=self.model,
wavelength=wavelength,
flux=flux,
parameters=model_param,
quantity=quantity)
if 'lognorm_radius' in model_param and 'lognorm_sigma' in model_param and \
'lognorm_ext' in model_param:
model_box.flux = self.apply_lognorm_ext(model_box.wavelength,
model_box.flux,
model_param['lognorm_radius'],
model_param['lognorm_sigma'],
model_param['lognorm_ext'])
if 'powerlaw_max' in model_param and 'powerlaw_exp' in model_param and \
'powerlaw_ext' in model_param:
model_box.flux = self.apply_powerlaw_ext(model_box.wavelength,
model_box.flux,
model_param['powerlaw_max'],
model_param['powerlaw_exp'],
model_param['powerlaw_ext'])
if 'ism_ext' in model_param and 'ism_red' in model_param:
model_box.flux = self.apply_ism_ext(model_box.wavelength,
model_box.flux,
model_param['ism_ext'],
model_param['ism_red'])
if 'radius' in model_box.parameters:
model_box.parameters['luminosity'] = 4. * np.pi * (
model_box.parameters['radius'] * constants.R_JUP)**2 * constants.SIGMA_SB * \
model_box.parameters['teff']**4. / constants.L_SUN # (Lsun)
return model_box
def get_spectrum(
self,
model_param: Dict[str, Union[float, List[float]]],
spec_res: float,
smooth: bool = False,
wavel_resample: Optional[np.ndarray] = None,
) -> box.ModelBox:
"""
Function for calculating a Planck spectrum or a combination of
multiple Planck spectra. The spectrum is calculated at
:math:`R = 500`. Afterwards, an optional smoothing and
wavelength resampling can be applied.
Parameters
----------
model_param : dict
Dictionary with the 'teff' (K), 'radius' (Rjup), and
'parallax' (mas) or 'distance' (pc). The values of
'teff' and 'radius' can be a single float, or a list
with floats for a combination of multiple Planck
functions, e.g. {'teff': [1500., 1000.],
'radius': [1., 2.], 'distance': 10.}.
spec_res : float
Spectral resolution that is used for smoothing the spectrum
with a Gaussian kernel when ``smooth=True``.
smooth : bool
If ``True``, the spectrum is smoothed to the spectral
resolution of ``spec_res``.
wavel_resample : np.ndarray, None
Wavelength points (um) to which the spectrum will be
resampled. The resampling is applied after the optional
smoothing to ``spec_res`` when ``smooth=True``.
Returns
-------
species.core.box.ModelBox
Box with the Planck spectrum.
"""
if "teff" in model_param and isinstance(model_param["teff"], list):
model_param = self.update_parameters(model_param)
wavel_points = read_util.create_wavelengths(self.wavel_range, 500.0)
n_planck = 0
for item in model_param:
if item[:4] == "teff":
n_planck += 1
if n_planck == 1:
if "radius" in model_param and "parallax" in model_param:
scaling = (
(model_param["radius"] * constants.R_JUP)
/ (1e3 * constants.PARSEC / model_param["parallax"])
) ** 2
elif "radius" in model_param and "distance" in model_param:
scaling = (
(model_param["radius"] * constants.R_JUP)
/ (model_param["distance"] * constants.PARSEC)
) ** 2
else:
scaling = 1.0
flux = self.planck(
wavel_points, model_param["teff"], scaling
) # (W m-2 um-1)
else:
flux = np.zeros(wavel_points.shape)
for i in range(n_planck):
if f"radius_{i}" in model_param and "parallax" in model_param:
scaling = (
(model_param[f"radius_{i}"] * constants.R_JUP)
/ (1e3 * constants.PARSEC / model_param["parallax"])
) ** 2
elif f"radius_{i}" in model_param and "distance" in model_param:
scaling = (
(model_param[f"radius_{i}"] * constants.R_JUP)
/ (model_param["distance"] * constants.PARSEC)
) ** 2
else:
scaling = 1.0
flux += self.planck(
wavel_points, model_param[f"teff_{i}"], scaling
) # (W m-2 um-1)
if smooth:
flux = read_util.smooth_spectrum(wavel_points, flux, spec_res)
model_box = box.create_box(
boxtype="model",
model="planck",
wavelength=wavel_points,
flux=flux,
parameters=model_param,
quantity="flux",
)
if wavel_resample is not None:
flux = spectres.spectres(
wavel_resample,
wavel_points,
flux,
spec_errs=None,
fill=np.nan,
verbose=True,
)
model_box.wavelength = wavel_resample
model_box.flux = flux
if n_planck == 1 and "radius" in model_param:
model_box.parameters["luminosity"] = (
4.0
* np.pi
* (model_box.parameters["radius"] * constants.R_JUP) ** 2
* constants.SIGMA_SB
* model_box.parameters["teff"] ** 4.0
/ constants.L_SUN
) # (Lsun)
elif n_planck > 1:
lum_total = 0.0
for i in range(n_planck):
if f"radius_{i}" in model_box.parameters:
# Add up the luminosity of the blackbody components (Lsun)
surface = (
4.0
* np.pi
* (model_box.parameters[f"radius_{i}"] * constants.R_JUP) ** 2
)
lum_total += (
surface
* constants.SIGMA_SB
* model_box.parameters[f"teff_{i}"] ** 4.0
/ constants.L_SUN
)
if lum_total > 0.0:
model_box.parameters["luminosity"] = lum_total
return model_box
def plot_empirical_spectra(
tag: str,
n_spectra: int,
flux_offset: Optional[float] = None,
label_pos: Optional[Tuple[float, float]] = None,
xlim: Optional[Tuple[float, float]] = None,
ylim: Optional[Tuple[float, float]] = None,
title: Optional[str] = None,
offset: Optional[Tuple[float, float]] = None,
figsize: Optional[Tuple[float, float]] = (4.0, 2.5),
output: Optional[str] = "empirical.pdf",
):
"""
Function for plotting the results from the empirical spectrum comparison.
Parameters
----------
tag : str
Database tag where the results from the empirical comparison with
:class:`~species.analysis.empirical.CompareSpectra.spectral_type` are stored.
n_spectra : int
The number of spectra with the lowest goodness-of-fit statistic that will be plotted in
comparison with the data.
label_pos : tuple(float, float), None
Position for the name labels. Should be provided as (x, y) for the lowest spectrum. The
``flux_offset`` will be applied to the remaining spectra. The labels are only
plotted if the argument of both ``label_pos`` and ``flux_offset`` are not ``None``.
flux_offset : float, None
Offset to be applied such that the spectra do not overlap. No offset is applied if the
argument is set to ``None``.
xlim : tuple(float, float)
Limits of the spectral type axis.
ylim : tuple(float, float)
Limits of the goodness-of-fit axis.
title : str
Plot title.
offset : tuple(float, float)
Offset for the label of the x- and y-axis.
figsize : tuple(float, float)
Figure size.
output : str
Output filename for the plot. The plot is shown in an
interface window if the argument is set to ``None``.
Returns
-------
NoneType
None
"""
if output is None:
print("Plotting empirical spectra comparison...", end="")
else:
print(f"Plotting empirical spectra comparison: {output}...", end="")
if flux_offset is None:
flux_offset = 0.0
config_file = os.path.join(os.getcwd(), "species_config.ini")
config = configparser.ConfigParser()
config.read(config_file)
db_path = config["species"]["database"]
h5_file = h5py.File(db_path, "r")
dset = h5_file[f"results/empirical/{tag}/names"]
object_name = dset.attrs["object_name"]
spec_library = dset.attrs["spec_library"]
n_spec_name = dset.attrs["n_spec_name"]
spec_name = []
for i in range(n_spec_name):
spec_name.append(dset.attrs[f"spec_name{i}"])
names = np.array(dset)
flux_scaling = np.array(h5_file[f"results/empirical/{tag}/flux_scaling"])
av_ext = np.array(h5_file[f"results/empirical/{tag}/av_ext"])
rad_vel = np.array(h5_file[f"results/empirical/{tag}/rad_vel"])
rad_vel *= 1e3 # (m s-1)
mpl.rcParams["font.serif"] = ["Bitstream Vera Serif"]
mpl.rcParams["font.family"] = "serif"
plt.rc("axes", edgecolor="black", linewidth=2.2)
plt.rcParams["axes.axisbelow"] = False
plt.figure(1, figsize=figsize)
gridsp = mpl.gridspec.GridSpec(1, 1)
gridsp.update(wspace=0, hspace=0, left=0, right=1, bottom=0, top=1)
ax = plt.subplot(gridsp[0, 0])
ax.tick_params(
axis="both",
which="major",
colors="black",
labelcolor="black",
direction="in",
width=1,
length=5,
labelsize=12,
top=True,
bottom=True,
left=True,
right=True,
)
ax.tick_params(
axis="both",
which="minor",
colors="black",
labelcolor="black",
direction="in",
width=1,
length=3,
labelsize=12,
top=True,
bottom=True,
left=True,
right=True,
)
ax.xaxis.set_minor_locator(AutoMinorLocator(5))
ax.yaxis.set_minor_locator(AutoMinorLocator(5))
ax.set_xlabel("Wavelength (µm)", fontsize=13)
if flux_offset == 0.0:
ax.set_ylabel(r"$\mathregular{F}_\lambda$ (W m$^{-2}$ µm$^{-1}$)", fontsize=11)
else:
ax.set_ylabel(
r"$\mathregular{F}_\lambda$ (W m$^{-2}$ µm$^{-1}$) + offset", fontsize=11
)
if xlim is not None:
ax.set_xlim(xlim[0], xlim[1])
if ylim is not None:
ax.set_ylim(ylim[0], ylim[1])
if offset is not None:
ax.get_xaxis().set_label_coords(0.5, offset[0])
ax.get_yaxis().set_label_coords(offset[1], 0.5)
else:
ax.get_xaxis().set_label_coords(0.5, -0.1)
ax.get_yaxis().set_label_coords(-0.1, 0.5)
if title is not None:
ax.set_title(title, y=1.02, fontsize=13)
read_obj = read_object.ReadObject(object_name)
obj_spec = []
obj_res = []
for item in spec_name:
obj_spec.append(read_obj.get_spectrum()[item][0])
obj_res.append(read_obj.get_spectrum()[item][3])
if flux_offset == 0.0:
for spec_item in obj_spec:
ax.plot(spec_item[:, 0], spec_item[:, 1], "-", lw=0.5, color="black")
for i in range(n_spectra):
if isinstance(names[i], str):
name_item = names[i]
else:
name_item = names[i].decode("utf-8")
dset = h5_file[f"spectra/{spec_library}/{name_item}"]
sptype = dset.attrs["sptype"]
spectrum = np.asarray(dset)
if flux_offset != 0.0:
for spec_item in obj_spec:
ax.plot(
spec_item[:, 0],
(n_spectra - i - 1) * flux_offset + spec_item[:, 1],
"-",
lw=0.5,
color="black",
)
for j, spec_item in enumerate(obj_spec):
ism_ext = dust_util.ism_extinction(av_ext[i], 3.1, spectrum[:, 0])
ext_scaling = 10.0 ** (-0.4 * ism_ext)
wavel_shifted = (
spectrum[:, 0] + spectrum[:, 0] * rad_vel[i] / constants.LIGHT
)
flux_smooth = read_util.smooth_spectrum(
wavel_shifted,
spectrum[:, 1] * ext_scaling,
spec_res=obj_res[j],
force_smooth=True,
)
interp_spec = interp1d(
spectrum[:, 0], flux_smooth, fill_value="extrapolate"
)
indices = np.where(
(obj_spec[j][:, 0] > np.amin(spectrum[:, 0]))
& (obj_spec[j][:, 0] < np.amax(spectrum[:, 0]))
)[0]
flux_resample = interp_spec(obj_spec[j][indices, 0])
ax.plot(
obj_spec[j][indices, 0],
(n_spectra - i - 1) * flux_offset + flux_scaling[i][j] * flux_resample,
color="tomato",
lw=0.5,
)
if label_pos is not None and flux_offset != 0.0:
label_text = name_item + ", " + sptype
if av_ext[i] != 0.0:
label_text += r", A$_\mathregular{V}$ = " + f"{av_ext[i]:.1f}"
ax.text(
label_pos[0],
label_pos[1] + (n_spectra - i - 1) * flux_offset,
label_text,
fontsize=8.0,
ha="left",
)
print(" [DONE]")
if output is None:
plt.show()
else:
plt.savefig(output, bbox_inches="tight")
plt.clf()
plt.close()
h5_file.close()
def get_model(self, model_par, specres=None):
"""
Parameters
----------
model_par : dict
Model parameter values.
specres : float
Spectral resolution, achieved by smoothing with a Gaussian kernel. The original
wavelength points are used if set to None. Using a high spectral resolution is
computationally faster if the original wavelength grid has a fine sampling.
Returns
-------
species.core.box.ModelBox
Box with the model spectrum.
"""
if 'mass' in model_par:
mass = 1e3 * model_par['mass'] * constants.M_JUP # [g]
radius = math.sqrt(1e3 * constants.GRAVITY * mass /
(10.**model_par['logg'])) # [cm]
model_par['radius'] = 1e-2 * radius / constants.R_JUP # [Rjup]
if self.spectrum_interp is None:
self.interpolate()
if self.wavelength is None:
wl_points = self.get_wavelength()
self.wavelength = (wl_points[0], wl_points[-1])
if self.model in ('drift-phoenix', 'bt-nextgen',
'petitcode_warm_clear'):
parameters = [
model_par['teff'], model_par['logg'], model_par['feh']
]
elif self.model in ('bt-settl', 'ames-dusty', 'ames-cond'):
parameters = [model_par['teff'], model_par['logg']]
elif self.model == 'petitcode_warm_cloudy':
parameters = [
model_par['teff'], model_par['logg'], model_par['feh'],
model_par['fsed']
]
elif self.model == 'petitcode_hot_clear':
parameters = [
model_par['teff'], model_par['logg'], model_par['feh'],
model_par['co']
]
elif self.model == 'petitcode_hot_cloudy':
parameters = [
model_par['teff'], model_par['logg'], model_par['feh'],
model_par['co'], model_par['fsed']
]
flux = self.spectrum_interp(parameters)[0]
if 'radius' in model_par:
model_par['mass'] = read_util.get_mass(model_par)
if 'distance' in model_par:
scaling = (model_par['radius']*constants.R_JUP)**2 / \
(model_par['distance']*constants.PARSEC)**2
flux *= scaling
if specres is not None:
index = np.where(np.isnan(flux))[0]
if index.size > 0:
raise ValueError('Flux values should not contains NaNs.')
flux = read_util.smooth_spectrum(wavelength=self.wl_points,
flux=flux,
specres=specres,
size=11)
return box.create_box(boxtype='model',
model=self.model,
wavelength=self.wl_points,
flux=flux,
parameters=model_par)