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The Masses of Transition Circumstellar Disks: Observational Support for Photoevaporation Models
Lucas A. Cieza, Jonathan J. Swift, Geoffrey S. Mathews +1
We report deep Sub-Millimeter Array observations of 26 pre-main-sequence (PMS) stars with evolved inner disks. These observations measure the mass of the outer disk (r ~20-100 AU)…
The Evolution of Primordial Circumstellar Disks
Lucas A. Cieza
Circumstellar disks are an integral part of the star formation process and the sites where planets are formed. Understanding the physical processes that drive their evolution, as d…
Spitzer observations of the Hyades: Circumstellar debris disks at 625 Myr of age
Lucas Cieza, William D. Cochran, Jean-Charles Augereau
We use the Spitzer Space Telescope to search for infrared excess at 24, 70, and 160 micron due to debris disks around a sample of 45 FGK-type members of the Hyades cluster. We supp…
The Spitzer Gould Belt Survey of Large Nearby Interstellar Clouds: Discovery of a Dense Embedded Cluster in the Serpens-Aquila Rift
R. A. Gutermuth, T. L. Bourke, L. E. Allen +12
We report the discovery of a nearby, embedded cluster of young stellar objects, associated filamentary infrared dark cloud, and 4.5 micron shock emission knots from outflows detect…
The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds: VII. Ophiuchus Observed with MIPS
Deborah L. Padgett, Luisa M. Rebull, Karl R. Stapelfeldt +21
We present maps of 14.4 deg^2 of the Ophiuchus dark clouds observed by the Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS). These high quality maps depict b…
Testing the Disk Regulation Paradigm with Spitzer Observations. II. A Clear Signature of Star-Disk Interaction in NGC 2264 and the Orion Nebula Cluster
L. Cieza, N. Baliber
Observations of PMS star rotation periods reveal slow rotators in young clusters of various ages, indicating that angular momentum is somehow removed from these rotating masses. Th…