HST

HST images take very long to download, so the user might prefer to download the images manually (or maybe use private data) and then use set_HST_image to include the image into HostPhot’s workflow.

The difference with other surveys is that HostPhot only handles one filter at a time when working with HST given the large combination of instruments and filters:

import hostphot
print('HostPhot version:', hostphot.__version__)

HostPhot version: 2.6.0

from hostphot.cutouts import set_HST_image

name = 'SN2011ee'
ra, dec = 351.9889166667, +8.7772500000
host_ra, host_dec = 351.98623877, +8.77895936
survey = 'HST'
filt = 'WFC3_UVIS_F275W'

file = 'hst_16741_3d_wfc3_uvis_f275w_iepo3d_drc.fits'
set_HST_image(file, filt, name)

The mask can be performed in the usual way:

from hostphot.image_masking import create_mask

create_mask(name, host_ra, host_dec, filt, survey=survey, threshold=6)

Same thing with the photometry:

import hostphot.local_photometry as lp

ap_radii = [3, 4]
z = 0.0294468

results = lp.multi_band_phot(name, ra, dec, z, filters=filt,
                             survey=survey, ap_radii=ap_radii,
                             use_mask=True, correct_extinction=True,
                             save_plots=True, raise_exception=True)
results

{'name': 'SN2011ee',
 'ra': 351.9889166667,
 'dec': 8.77725,
 'redshift': 0.0294468,
 'survey': 'HST',
 'WFC3_UVIS_F275W_3': 19.216330997223157,
 'WFC3_UVIS_F275W_3_err': 0.010700905390909725,
 'WFC3_UVIS_F275W_3_flux': 69.69300555478219,
 'WFC3_UVIS_F275W_3_flux_err': 0.6779114129675258,
 'WFC3_UVIS_F275W_4': 18.558496365300403,
 'WFC3_UVIS_F275W_4_err': 0.0078856391137125,
 'WFC3_UVIS_F275W_4_flux': 127.73886321170855,
 'WFC3_UVIS_F275W_4_flux_err': 0.9053093552572765}

import hostphot.global_photometry as gp

results = gp.multi_band_phot(name, host_ra, host_dec, filters=filt,
                             survey=survey, ra=ra, dec=dec,
                             use_mask=True, correct_extinction=True,
                             threshold=6, common_aperture=False,
                             save_plots=True, raise_exception=True)
results

{'name': 'SN2011ee',
 'host_ra': 351.98623877,
 'host_dec': 8.77895936,
 'survey': 'HST',
 'WFC3_UVIS_F275W': 16.928938161038392,
 'WFC3_UVIS_F275W_err': 0.037112242979449296,
 'WFC3_UVIS_F275W_flux': 572.8355467965029,
 'WFC3_UVIS_F275W_flux_err': 19.55931311133422}