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We present a search for HI in the circumgalactic medium (CGM) of 21 massive($\langle \log M_\star \rangle \sim 11.4$), luminous red galaxies (LRGs) at$z\sim0.5$. Using UV spectroscopy of QSO sightlines projected within 500 kpc($\sim R_{vir}$) of these galaxies, we detect HI absorption in 11/21sightlines, including two partial Lyman limit systems and two Lyman limitsystems. The covering factor of $\log N(HI) \ge 16.0$ gas within the virialradius of these LRGs is $f_c(\rho \le R_{vir}) = 0.27^{+0.11}_{-0.10}$, whilefor optically-thick gas ($\log N(HI) \ge 17.2$) it is $f_c(\rho \le R_{vir}) =0.15^{+0.10}_{-0.07}$. Combining this sample of massive galaxies with previousgalaxy-selected CGM studies, we find no strong dependence of the HI coveringfactor on galaxy mass, although star-forming galaxies show marginally highercovering factors. There is no evidence for a critical mass above which dense,cold ($T \sim 10^4$ K) gas is suppressed in the CGM of galaxies (spanningstellar masses $9.5 \lesssim \log M_\star \lesssim 11.8$). The metallicitydistribution in LRGs is indistinguishable from those found about lower-massstar-forming galaxies, and we find low-metallicity gas with $[{\rm X/H}]\approx -1.8$ (1.5% solar) and below about massive galaxies. About half thecases show super-solar [FeII/MgII] abundances as seen previously in cool gasnear massive galaxies. While the high-metallicity cold gas seen in LRGs couldplausibly result from condensation from a corona, the low-metallicity gas isinconsistent with this interpretation.

The Red Dead Redemption Survey of Circumgalactic Gas About Massive Galaxies. I. Mass and Metallicity of the Cool Phase