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Full-Text Articles in Physical Sciences and Mathematics
The Gas/Dust Ratio Of Circumstellar Disks: Testing Models Of Planetesimal Formation, David Horne, Erika Gibb, Terrence Rettig, Sean Brittain, David Tilley, Dinshaw Balsara
The Gas/Dust Ratio Of Circumstellar Disks: Testing Models Of Planetesimal Formation, David Horne, Erika Gibb, Terrence Rettig, Sean Brittain, David Tilley, Dinshaw Balsara
Sean D Brittain
We present high-resolution, near-infrared NIRSPEC observations of CO absorption toward six class II T Tauri stars: AA Tau, DG Tau, IQ Tau, RY Tau, CW Tau, and Haro 6–5b. 12CO overtone absorption lines originating from the circumstellar disk of each object were used to calculate line-of-sight gas column densities toward each source. We measured the gas/dust ratio as a function of disk inclination, utilizing measured visual extinctions and inclinations for each star. The majority of our sources show further evidence for a correlation between the gas/dust columndensity ratio and disk inclination similar to that found by Rettig et al.
Gas In Protoplanetary Systems (Gasps). I. First Results, G Mathews, W.R.F. Dent, J Williams, C Howard, G Meeus, B Riaz, A Roberge, G Sandell, B Vandenbussche, G Duchene, I Kamp, F Menard, B Montesinos, C Pinte, W. Thi, P Woitke, J Alacid, S Andrews, D Ardila, G Aresu, J Augereau, D Barrado, Sean Brittain
Gas In Protoplanetary Systems (Gasps). I. First Results, G Mathews, W.R.F. Dent, J Williams, C Howard, G Meeus, B Riaz, A Roberge, G Sandell, B Vandenbussche, G Duchene, I Kamp, F Menard, B Montesinos, C Pinte, W. Thi, P Woitke, J Alacid, S Andrews, D Ardila, G Aresu, J Augereau, D Barrado, Sean Brittain
Sean D Brittain
Context. Circumstellar discs are ubiquitous around young stars, but rapidly dissipate their gas and dust on timescales of a few Myr. The Herschel Space Observatory allows for the study of the warm disc atmosphere, using far-infrared spectroscopy to measure gas content and excitation conditions, and far-IR photometry to constrain the dust distribution. Aims. We aim to detect and characterize the gas content of circumstellar discs in four targets as part of the Herschel science demonstration phase. Methods. We carried out sensitive medium resolution spectroscopy and high sensitivity photometry at λ ∼60–190 μm using the Photodetector Array Camera and Spectrometer instrument …
The Unusual Protoplanetary Disk Around The T Tauri Star Et Chamaeleontis, P Woitke, B Riaz, G Duchene, I Pascucci, A Ran Lyo, W.R.F. Dent, N Phillips, W Thi, F Menard, G Herczeg, E Bergin, A Brown, A Mora, I Kamp, G Aresu, Sean Brittain, I De Gregorio-Monsalvo, G Sandell
The Unusual Protoplanetary Disk Around The T Tauri Star Et Chamaeleontis, P Woitke, B Riaz, G Duchene, I Pascucci, A Ran Lyo, W.R.F. Dent, N Phillips, W Thi, F Menard, G Herczeg, E Bergin, A Brown, A Mora, I Kamp, G Aresu, Sean Brittain, I De Gregorio-Monsalvo, G Sandell
Sean D Brittain
We present new continuum and line observations, along with modelling, of the faint (6−8) Myr old T Tauri star ETCha belonging to the η Chamaeleontis cluster. We have acquired Herschel/PACS photometric fluxes at 70 μm and 160 μm, as well as a detection of the [OI] 63 μm fine-structure line in emission, and derived upper limits for some other far-IR OI, CII, CO and o-H2O lines. These observations were carried out in the frame of the open time key programme GASPS, where ETCha was selected as one of the science demonstration phase targets. The Herschel data is complemented by new …
Hd 100453: A Link Between Gas-Rich Protoplanetary Disks And Gas-Poor Debris Disks, K Collins, C Grady, K Hamaguchi, J Wisniewski, Sean Brittain, M Sitko, W Carpenter, J Williams, G Mathews, G Williger, R Van Boekel, A Carmona, Th. Henning, M Van Den Ancker, G Meeus, X Chen, R Petre, B Woodgate
Hd 100453: A Link Between Gas-Rich Protoplanetary Disks And Gas-Poor Debris Disks, K Collins, C Grady, K Hamaguchi, J Wisniewski, Sean Brittain, M Sitko, W Carpenter, J Williams, G Mathews, G Williger, R Van Boekel, A Carmona, Th. Henning, M Van Den Ancker, G Meeus, X Chen, R Petre, B Woodgate
Sean D Brittain
HD 100453 has an IR spectral energy distribution (SED) which can be fit with a power law plus a blackbody. Previous analysis of the SED suggests that the system is a young Herbig Ae star with a gas-rich, flared disk. We reexamine the evolutionary state of the HD 100453 system by refining its age (based on a candidate low-mass companion) and by examining limits on the disk extent, mass accretion rate, and gas content of the disk environment. We confirm that HD 100453B is a common proper motion companion to HD 100453A, with a spectral type of M4.0V-M4.5V, and derive …