Utility Functions

Functions in utility module for getting data.

utils.get_spectrum(ra, dec)

Returns the spectrum of input star from SDSS.

Parameters

  • ra (float) – ra of input stars.

  • dec (float) – dec of input stars.

Returns

wavelength in SDSS spectrum sp_flux (array): flux in SDSS spectrum

Return type

sp_lambda (array)

utils.load_gaia(ra, dec, dr=2)

Read in Gaia data from Gaia DR2, and returns stellar parameters & Gaia IDs.

Parameters

  • ra (float) – ra values of input stars.

  • dec (float) – dec values of input stars.

  • dr (int) – Gaia data release no. Default is 2.

Returns

Gaia Source IDs for all stars. teff (float): stellar effective temperature in Kelvin. rad (float): stellar radius in solar units. lum (float): stellar luminosity in solar units.

Return type

gaia_id (int)

utils.load_kepler(ra, dec, quarters=False, cadence='long')

Load in photometry from Kepler if exists. Example: KIC 3733346 (287.11345099999994, 38.81283)

Parameters

  • ra (float) – ra values of input stars.

  • dec (float) – dec values of input stars.

  • quarters (boolean) – Kepler quarters to download. Default is False.

  • cadence (str) – Kepler cadence of data to use. Default is long.

Returns

time values in lightcurve flux (array): flux values in lightcurve kicid (int): KICID of object

Return type

time (array)

utils.load_sdss(ra, dec)

Read in Gaia data from Gaia DR2.

Parameters

  • ra (float) – ra of input stars.

  • dec (float) – dec of input stars.

Returns

SDSS ID of input star.

Return type

sdss_ids (array)

utils.load_tess(ra, dec)

Load in photometry from TESS if exists. Example: KIC 3733346 (287.11345099999994, 38.81283) TESS example: 261136679

Parameters

  • ra (float) – ra values of input stars.

  • dec (float) – dec values of input stars.

Returns

time values in lightcurve flux (array): flux values in lightcurve ticid (int): TICID of object

Return type

time (array)

utils.read_table(fname)

Read in stars from a file if it exists with columns RA & Dec.

Parameters

fname (str) – name of file that contains stars to read in.

Returns

right ascension (ra) values of input stars. dec (array): declination (dec) values of input stars.

Return type

ra (array)