Absorption spectroscopy of 130 young debris-disc hosts yields two new circumstellar-gas detections (TYC7879-1373-1 stable; HIP30414 variable/accreting), both pre-MS and <5 Myr, bringing the <10 Myr total to eight.
The search for gas in debris discs: ALMA detection of CO gas in HD 36546
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abstract
Debris discs represent the last stages of planet formation and as such are expected to be depleted of primordial gas. Nonetheless, in the last few years the presence of cold gas has been reported in $\sim$ 20 debris discs from far-IR to (sub-)mm observations and hot gas has been observed in the optical spectra of debris discs for decades. While the origin of this gas is still uncertain, most evidences point towards a secondary origin, as a result of collisions and evaporation of small bodies in the disc. In this paper, we present ALMA observations aimed at the detection of CO gas in a sample of 8 debris discs with optical gas detections. We report the detection of CO ($^{12}$CO and $^{13}$CO) gas in HD 36546, the brightest and youngest disc in our sample, and provide upper limits to the presence of gas in the remaining seven discs.
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A search for circumstellar gas in pre-main-sequence debris discs using absorption spectroscopy
Absorption spectroscopy of 130 young debris-disc hosts yields two new circumstellar-gas detections (TYC7879-1373-1 stable; HIP30414 variable/accreting), both pre-MS and <5 Myr, bringing the <10 Myr total to eight.