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A co survey in planet-forming disks: characterizing the gas content in the epoch of planet formation.

Universidad de Chile. Repositorio Académico

Título A co survey in planet-forming disks: characterizing the gas content in the epoch of planet formation.
Autor Montesinos, B.
Dougados, Catherine
Phillips, N.
De Gregorio-Monsalvo, Itziar
Palau, Aina
Casassus Montero, Simon Pablo
Pérez, Sebastián
Dent, W. F. R.
Ménard, François
Eiroa, C.
Mardones Pérez, Diego
Hales, A.S.
Wilner, D.
Hughes, A.M.
Torrelles, J. M.
Garay Brignardello, Guido Alejandro
Tema circumstellar matter
Descripción Artículo de publicación ISI.
We carried out a 12CO(3-2) survey of 52 southern stars with a wide range of IR excesses (L IR/L *) using the single-dish telescopes APEX and ASTE. The main aims were (1) to characterize the evolution of molecular gas in circumstellar disks using L IR/L * values as a proxy of disk dust evolution, and (2) to identify new gas-rich disk systems suitable for detailed study with ALMA. About 60% of the sample (31 systems) have L IR/L * > 0.01, typical of T Tauri or Herbig AeBe stars, and the rest (21 systems) have L IR/L * < 0.01, typical of debris disks. We detect CO(3-2) emission from 20 systems, and 18 (90%) of these have L IR/L * > 0.01. However, the spectra of only four of the newly detected systems appear free of contamination from background or foreground emission from molecular clouds. These include the early-type stars HD 104237 (A4/5V, 116 pc) and HD 98922 (A2 III, 507 pc, as determined in this work), where our observations reveal the presence of CO-rich circumstellar disks for the first time. Of the other detected sources, many could harbor gaseous circumstellar disks, but our data are inconclusive. For these two newly discovered gas-rich disks, we present radiative transfer models that simultaneously reproduce their spectral energy distributions and the 12CO(3-2) line profiles. For both of these systems, the data are fit well by geometrically flat disks, placing them in the small class of non-flaring disks with significant molecular gas reservoirs.
Fecha 2014-09-16T13:28:17Z
Tipo Artículo de revista
Enlace The Astronomical Journal, 148:47 (21pp), 2014 September.
Idioma en_US
Publicador The American Astronomical Society.