Stellar masses, sizes, and radial profiles for 465 nearby early-type
  galaxies: an extension to the Spitzer Survey of Stellar Structure in Galaxies
  (S$^{4}$G)
  The Spitzer Survey of Stellar Structure in Galaxies (S$^{4}$G) is a detailed
study of over 2300 nearby galaxies in the near-infrared (NIR), which has been
critical to our understanding of the detailed structures of nearby galaxies.
Because the sample galaxies were selected only using radio-derived velocities,
however, the survey favored late-type disk galaxies over lenticulars and
ellipticals. A follow-up Spitzer survey was conducted to rectify this bias,
adding 465 early-type galaxies (ETGs) to the original sample, to be analyzed in
a manner consistent with the initial survey. We present the data release of
this ETG extension, up to the third data processing pipeline (P3): surface
photometry. We produce curves of growth and radial surface brightness profiles
(with and without inclination corrections) using reduced and masked Spitzer
IRAC 3.6$\mu$m and 4.5$\mu$m images produced through Pipelines 1 and 2,
respectively. From these profiles, we derive the following integrated
quantities: total magnitudes, stellar masses, concentration parameters, and
galaxy size metrics. We showcase NIR scaling relations for ETGs among these
quantities. We examine general trends across the whole S$^{4}$G and ETG
extension among our derived parameters, highlighting differences between ETGs
and late-type galaxies (LTGs). ETGs are, on average, more massive and more
concentrated than LTGs, and also show subtle distinctions among ETG
morphological sub-types. We also derive the following scaling relations and
compare with previous results in visible light: mass--size (both half-light and
isophotal), mass--concentration, mass--surface brightness (central, effective,
and within 1 kpc), and mass--color. We find good agreement with previous works,
though some relations (e.g., mass--central surface brightness) will require
more careful multi-component decompositions to be fully understood.
