Lovell, JB;
Kennedy, GM;
Marino, S;
Wyatt, MC;
Ansdell, M;
Kama, M;
Manara, CF;
... Williams, JP; + view all
(2020)
Rapid CO gas dispersal from NO Lup’s class III circumstellar disc.
Monthly Notices of the Royal Astronomical Society: Letters
10.1093/mnrasl/slaa189.
(In press).
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Abstract
We observed the K7 class III star NO Lup in an ALMA survey of the 1-3 Myr Lupus association and detected circumstellar dust and CO gas. Here we show that the J = 3-2 CO emission is both spectrally and spatially resolved, with a broad velocity width ∼19 km s−1 for its resolved size ∼1″ (∼130 au). We model the gas emission as a Keplerian disc, finding consistency, but only with a central mass of ∼11M⊙, which is implausible given its spectral type and X-Shooter spectrum. A good fit to the data can also be found by modelling the CO emission as outflowing gas with a radial velocity ∼22 km s−1. We interpret NO Lup’s CO emission as the first imaged class III circumstellar disc with outflowing gas. We conclude that the CO is continually replenished, but cannot say if this is from the break-up of icy planetesimals or from the last remnants of the protoplanetary disc. We suggest further work to explore the origin of this CO, and its higher than expected velocity in comparison to photoevaporative models.
| Type: | Article |
|---|---|
| Title: | Rapid CO gas dispersal from NO Lup’s class III circumstellar disc |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnrasl/slaa189 |
| Publisher version: | https://doi.org/10.1093/mnrasl/slaa189 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | circumstellar matter - planetary systems - submillimetre: planetary systems |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10117017 |
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