Motte to Rev. [R. ?] Woodford 12 March 1727/8

An Alma Continuum Survey of Circumstellar Disks in the Upper Scorpius Ob Association

“…In addition to the Upper Sco observations presented here (see also Mathews et al 2012a), other star forming regions that have been surveyed at submillimeter wavelengths include Taurus (Beckwith et al 1990;Andrews & Williams 2005;Andrews et al 2013), ρ Oph (André et al 1994;Motte et al 1998;Andrews & Williams 2007b), IC 348 (Carpenter 2002;Lee et al 2011), the Orion Nebula Cluster (Mann & Williams 2009a,b, 2010Eisner et al 2008) NGC 2024 (Eisner & Carpenter 2003), MBM 12 (Itoh et al 2003;Hogerheijde et al 2002), Lupus (Nuernberger et al 1997), Chamaeleon I (Henning et al 1993), Serpens (Testi & Sargent 1998), and σ Orionis (Williams et al 2013). Taurus is the one region that can be most readily compared with Upper Sco for a number of reasons.…”

“…Hundreds of ∼ 1-2 Myr old stars in the Taurus and Ophiuchus clouds have been surveyed in the submillimeter continuum with single dish telescopes and interferometers (Beckwith et al 1990;André et al 1994;Motte et al 1998;Andrews & Williams 2005, 2007bSchaefer et al 2009;Andrews et al 2013), and the continuum and/or spectral-line emission have been resolved in dozens of stars (Dutrey et al 1996;Simon et al 2000; Kitamura et al 2002;Andrews & Williams 2007a;Isella et al 2009;Andrews et al 2009Andrews et al , 2010Kwon et al 2011;Guilloteau et al 2011). Collectively, these extensive observations have established the disk properties around low-mass stars at an age of ∼ 1-2 Myr.…”