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As exoplanetary science matures into its third decade, we are increasinglyoffered the possibility of pre existing, archival observations for newlydetected candidates. This is particularly poignant for the TESS mission, whosesurvey spans bright, nearby dwarf stars in both hemispheres, which areprecisely the types of sources targeted by previous radial velocity (RV)surveys. On this basis, we investigated whether any of the TESS Objects ofInterest (TOIs) coincided with such observations, from which we find 18 singleplanet candidate systems. Of these, one exhibits an RV signature that has thecorrect period and phase matching the transiting planetary candidate with afalse alarm probability of less than 1 percent. After further checks, weexploit this fact to validate HD 183579b (TOI-1055b). This planet is less than4 Earth Radii and has better than 33 percent planetary mass measurements, thusadvancing the TESS primary objective of finding 50 such worlds. We find thatthis planet is amongst the most accessible small transiting planets foratmospheric characterization. Our work highlights that the efforts to confirmand even precisely measure the masses of new transiting planet candidates neednot always depend on acquiring new observations - that in some instances thesetasks can be completed with existing data.

Validation of HD 183579b using archival radial velocities: a warm-neptune orbiting a bright solar analog