DIGIT survey of far-infrared lines from protoplanetary discs-II. CO
CO is an important component of a protoplanetary disc as it is one of the most abundant gas
phase species. Furthermore, observations of CO transitions can be used as a diagnostic of
the gas, tracing conditions in both the inner and outer disc. We present Herschel/PACS
spectroscopy of a sample of 22 Herbig Ae/Be (HAEBEs) and eight T Tauri stars (TTS),
covering the pure rotational CO transitions from J= 14→ 13 up to J= 49→ 48. CO is detected
in only five HAEBEs, namely AB Aur, HD 36112, HD 97048, HD 100546, and IRS 48, and in�…
phase species. Furthermore, observations of CO transitions can be used as a diagnostic of
the gas, tracing conditions in both the inner and outer disc. We present Herschel/PACS
spectroscopy of a sample of 22 Herbig Ae/Be (HAEBEs) and eight T Tauri stars (TTS),
covering the pure rotational CO transitions from J= 14→ 13 up to J= 49→ 48. CO is detected
in only five HAEBEs, namely AB Aur, HD 36112, HD 97048, HD 100546, and IRS 48, and in�…
[HTML][HTML] Survival of molecular gas in cavities of transition disks-I. CO
S Bruderer�- Astronomy & Astrophysics, 2013 - aanda.org
Context. Planet formation is closely related to the structure and dispersal of protoplanetary
disks. A certain class of disks, called transition disks, exhibit cavities in dust images at scales
of up to a few 10s of AU. The formation mechanism of the cavities is still unclear. The gas
content of such cavities can be spatially resolved for the first time using the Atacama Large
Millimeter/submillimeter Array (ALMA). Aims. We develop a new series of models to simulate
the physical conditions and chemical abundances of the gas in cavities to address the�…
disks. A certain class of disks, called transition disks, exhibit cavities in dust images at scales
of up to a few 10s of AU. The formation mechanism of the cavities is still unclear. The gas
content of such cavities can be spatially resolved for the first time using the Atacama Large
Millimeter/submillimeter Array (ALMA). Aims. We develop a new series of models to simulate
the physical conditions and chemical abundances of the gas in cavities to address the�…
DIGIT survey of far-infrared lines from protoplanetary disks-I.[O i],[C ii], OH, H2O, and CH+
D Fedele, S Bruderer, EF Van Dishoeck, J Carr…�- Astronomy &�…, 2013 - aanda.org
We present far-infrared (50− 200 μm) spectroscopic observations of young pre-main-
sequence stars taken with Herschel/PACS as part of the DIGIT key project. The sample
includes 16 Herbig AeBe and 4 T Tauri sources observed in SED mode covering the entire
spectral range. An additional 6 Herbig AeBe and 4 T Tauri systems have been observed in
SED mode with a limited spectral coverage. Multiple atomic fine structure and molecular
lines are detected at the source position:[O i],[C ii], CO, OH, H 2 O, CH+. The most common�…
sequence stars taken with Herschel/PACS as part of the DIGIT key project. The sample
includes 16 Herbig AeBe and 4 T Tauri sources observed in SED mode covering the entire
spectral range. An additional 6 Herbig AeBe and 4 T Tauri systems have been observed in
SED mode with a limited spectral coverage. Multiple atomic fine structure and molecular
lines are detected at the source position:[O i],[C ii], CO, OH, H 2 O, CH+. The most common�…