 After subtracting the signals of the previously known Gliese 581 planets , b , c , d and e , the signals of two additional planets were apparent : a 445 @-@ day signal from a newly recognized outermost planet designated f , and the 37 @-@ day signal from Gliese 581 g . The probability that the detection of the latter was spurious was estimated at only 2 @.@ 7 in a million . The authors stated that while the 37 @-@ day signal is " clearly visible in the HIRES data set alone " , " the HARPS data set alone is not able to reliably sense this planet " and concluded , " It is really necessary to combine both data sets to sense all these planets reliably . " The Lick – Carnegie team explained the results of their research in a paper published in the Astrophysical Journal . Although not sanctioned by the IAU 's naming conventions , Vogt 's team informally refers to the planet as " Zarmina 's World " after his wife , and some cases simply as Zarmina . 
