Shih-ping Lai

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One of the central goals of the Spitzer Legacy Project ‘‘FromCores to Disks’’ (c2d) is to determine the frequency of circumstellar disks aroundweak-line T Tauri stars (WTTSs) and to study the properties and evolutionary status of these disks.Herewe present a census of disks for a sample of over 230WTTSs located in the c2d IRACandMIPSmaps of the Ophiuchus,(More)
We present the first experimental evidence of a coral (Oulastrea crispata) ingesting and assimilating seagrass material. Tropical seagrass meadows export a substantial portion of their productivity and can provide an important source of nutrients to neighbouring systems such as coral reefs; however, little is known about the mechanisms of this link. To(More)
We compute the mid-infrared extinction law from 3.6−24μm in three molecular clouds: Ophiuchus, Perseus, and Serpens, by combining data from the “Cores to Disks” Spitzer Legacy Science program with deep JHKs imaging. Using a new technique, we are able to calculate the line-of-sight extinction law towards each background star in our fields. With these(More)
Though flux freezing is a good approximation frequently assumed for molecular clouds, ambipolar diffusion (AD) is inevitable at certain scales. The scale at which AD sets in can be a crucial parameter for turbulence and the star formation process. However, both observation and simulation of AD are very challenging and our knowledge of it is very limited. We(More)
We present the first interferometric polarization maps of the NGC 2024 FIR 5 molecular core obtained with the BIMA array at approximately 2′′ resolution. We measure an average position angle of −60◦±6◦ in the main core of FIR 5 and 54◦±9◦ in the eastern wing of FIR 5. The morphology of the polarization angles in the main core of FIR 5 suggests that the(More)
We present observations of L1014, a dense core in the Cygnus region previously thought to be starless, but data from the Spitzer Space Telescope shows the presence of an embedded source. We propose a model for this source that includes a cold core, heated by the interstellar radiation field, and a low-luminosity internal source. The low luminosity of the(More)
We present the first interferometric polarization maps of the NGC2024 FIR 5 molecular core obtained with the BIMA array at approximately 2 resolution. We measure an average position angle of −60◦±6◦ in the main core of FIR 5 and 54◦±9◦ in the eastern wing of FIR 5. The morphology of the polarization angles in the main core of FIR 5 suggests that the field(More)
We have conducted a survey of the CCS line toward 11 dark clouds and star-forming regions at 30 spatial resolution and 0.054 km s spectral resolution. Our results show that CCS can only be detected in quiescent clouds, not in active star-forming regions. The CCS distribution shows remarkable clumpy structure, and 25 clumps are identified in 7 clouds. The(More)
We present maps of 14.4 deg of the Ophiuchus dark clouds observed by the Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS). Spitzer Science Center, MC 220-6, California Institute of Technology, Pasadena, CA 91125 USA email: dlp@ipac.caltech.edu Jet Propulsion Laboratory, MS 183-900, 4800 Oak Grove Drive, Pasadena, CA 91109 Department(More)
We are performing a series of observations with ground-based telescopes toward Planck Galactic cold clumps (PGCCs) in the λ Orionis complex in order to systematically investigate the effects of stellar feedback. In the particular case of PGCC G192.32-11.88, we discovered an extremely young Class 0 protostellar object (G192N) and a proto-brown dwarf(More)