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We detail the follow up and characterization of a transiting exo-Venusidentified by TESS, GJ 3929b, (TOI-2013b) and its non-transiting companionplanet, GJ 3929c (TOI-2013c). GJ 3929b is an Earth-sized exoplanet in itsstar's Venus-zone (P$_{b}$ = 2.616272 $\pm$ 0.5 days; S$_{b}$ =17.3$^{+0.8}_{-0.7}$ S$_{\oplus}$) orbiting a nearby M dwarf. GJ 3929c is mostlikely a non-transiting sub-Neptune. Using the new, ultra-precise NEIDspectrometer on the WIYN 3.5 m Telescope at Kitt Peak National Observatory, weare able to modify the mass constraints of planet b reported in previous worksand consequently improve the significance of the mass measurement to almost4$\sigma$ confidence (M$_{b}$ = 1.75 $\pm$ 0.45 M$_{\oplus}$). We furtheradjust the orbital period of planet c from its alias at 14.30 $\pm$ 0.03 daysto the likely true period of 15.04 $\pm$ 0.03 days, and adjust its minimum massto m$\sin i$ = 5.71 $\pm$ 0.92 M$_{\oplus}$. Using the diffuser-assisted ARCTICimager on the ARC 3.5 m telescope at Apache Point Observatory, in addition topublicly available TESS and LCOGT photometry, we are able to constrain theradius of planet b to R$_{p}$ = 1.09 $\pm$ 0.04 R$_{\oplus}$. GJ 3929b is a topcandidate for transmission spectroscopy in its size regime (TSM = 14 $\pm$ 4),and future atmospheric studies of GJ 3929b stand to shed light on the nature ofsmall planets orbiting M dwarfs.

GJ 3929: High Precision Photometric and Doppler Characterization of an Exo-Venus and its Hot, Mini-Neptune-mass Companion