Table 1
Upper limits on the inner radii of 12CO, integrated line flux, and corresponding gas masses of 12CO(J=3-2).
rmin12CO [au] |
12CO (J=3-2) Integrated Line Flux [Jy km s−1] |
13CO (J=3-2) Integrated Line Flux [Jy km s−1] |
12CO (J=3-2) τ12CO << 1 Mass [10−4 M⊕] |
12CO (J=3-2) τ12CO = 77 Mass [10−2 M⊕] |
|
|---|---|---|---|---|---|
| HD 9672 | 3 | 8.9 ± 0.9 | 3.0 ± 0.3 | 2.8 ± 0.3 | 2.2 ± 0.2 |
| HD 32297 | 68 | 3.7 ± 0.4 | 1.3 ± 0.1 | 5.8 ± 0.6 | 4.5 ± 0.5 |
| HD 121617 | 28 | 3.6 ± 0.4 | 1.5 ± 0.2 | 4.6 ± 0.5 | 3.5 ± 0.3 |
| HD 131488 | 6 | 2.7 ± 0.3 | 1.3 ± 0.1 | 5.9 ± 0.7 | 4.5 ± 0.5 |
| HD 131835 | 21 | 1.9 ± 0.2 | 0.61 ± 0.06 | 2.9 ± 0.3 | 2.2 ± 0.2 |
Notes. Upper limits on rmin correspond to the highest velocity and on-sky along-midplane distance from the star at which a 3 σ detection is achieved anywhere in each system. Integrated line fluxes were measured by spectro-spatially stacking the spectra of the ARKS gas-bearing targets. 12CO gas masses derived assuming 12CO are optically thin (τ12CO << 1) and assuming that the 12CO and 13CO is optically thick, and the 12CO/13CO ratio is 77 (ISM-like). The optically thin gas mass was calculated using Eq. (2) in Matrà et al. (2015) and by taking the peak-brightness temperatures from the peak-brightness temperature maps. Optically thin masses were scaled by the ISM 12CO/13CO ratio to calculate the optically thick mass.
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