 WASP @-@ 13 was observed between February 11 and 15 in 2008 by the SOPHIE échelle spectrograph at the Haute @-@ Provence Observatory in France , determining the radial velocity of the transiting body . Use of the FIES echelle spectrograph at the Nordic Optical Telescope in the Canary Islands gained other spectral measurements that yielded the characteristics of the star . Analysis of the SOPHIE and FIES data were used to constrain some of the orbiting body 's characteristics . The discovery of the orbiting body 's mass using radial velocity measurements led to its confirmation as the planet WASP @-@ 13b . 
 WASP @-@ 13 was observed between February 11 and 15 in 2008 by the SOPHIE échelle spectrograph at the Haute @-@ Provence Observatory in France , determining the radial velocity of the transiting body . Use of the FIES echelle spectrograph at the Nordic Optical Telescope in the Canary Islands gained other spectral measurements <a href='null_relcl' title='1'><mark>that</mark></a>yielded the characteristics of the star . Analysis of the SOPHIE and FIES data <a href='uninflect' title='2'><mark>were</mark></a> used to constrain some of the orbiting body <a href='null_genetive' title='3'><mark>'s</mark></a>characteristics . The discovery of the orbiting body <a href='null_genetive' title='4'><mark>'s</mark></a>mass using radial velocity measurements led to its confirmation as the planet WASP @-@ 13b . 
WASP @-@ 13 was observed between February 11 and 15 in 2008 by the SOPHIE échelle spectrograph at da Haute @-@ Provence Observatory in France , determining the radial velocity of the transiting body . Use of the FIES echelle spectrograph at the Nordic Optical Telescope in the Canary Islands gained other spectral measurements yielded the characteristics of the star . Analysis of tdaSOPHIE and FIES data was used to constrain sum of thdarbiting body  characteristics . Thedascovery of the orbiting body  mass using radial velocity measurements led to its confirmation as the planet WASP @-@ 13b .