2014ApJ...791..134K

We study the mid-infrared (IR) excess emission of early-type galaxies (ETGs) on the red sequence at z < 1 using a spectroscopic sample of galaxies in the fields of Great Observatories Origins Deep Survey (GOODS). In the mass-limited sample of 1025 galaxies with M_star> 10^10.5 M_☉ and 0.4 < z < 1.05, we identify 696 Spitzer 24 µm detected (above the 5σ) galaxies and find them to have a wide range of NUV-r and r-[12 µm] colors despite their red optical u - r colors. Even in the sample of very massive ETGs on the red sequence with M_star> 10^11.2 M_☉, more than 18% show excess emission over the photospheric emission in the mid-IR. The combination with the results of red ETGs in the local universe suggests that the recent star formation is not rare among quiescent, red ETGs at least out to z ∼ 1 if the mid-IR excess emission results from intermediate-age stars or/and from low-level ongoing star formation. Our color-color diagram including near-UV and mid-IR emissions are efficient not only for identifying ETGs with recent star formation, but also for distinguishing quiescent galaxies from dusty star-forming galaxies.