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Rapid CO gas dispersal from NO Lup’s class III circumstellar disc
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Lovell, J. B., Kennedy, Grant M., Marino, S., Wyatt, M. C., Ansdell, M., Kama, M., Manara, C. F., Matrá, L., Rosotti, G., Tazzari, M., Testi, L. and Williams, J. P. (2021) Rapid CO gas dispersal from NO Lup’s class III circumstellar disc. Monthly Notices of the Royal Astronomical Society: Letters, 502 (1). L66-L71. doi:10.1093/mnrasl/slaa189 ISSN 1745-3925.
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WRAP-rapid-CO-gas-dispersal-NO-Lup’s-class-III-circumstellar-disc-Kennedy-2020.pdf - Accepted Version - Requires a PDF viewer. Download (1630Kb) | Preview |
Official URL: http://dx.doi.org/10.1093/mnrasl/slaa189
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.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Circumstellar matter, Planetary systems, Kepler's laws, Protoplanetary disks | ||||||||||||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society: Letters | ||||||||||||||||||||||||||||||
Publisher: | Wiley | ||||||||||||||||||||||||||||||
ISSN: | 1745-3925 | ||||||||||||||||||||||||||||||
Official Date: | March 2021 | ||||||||||||||||||||||||||||||
Dates: |
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Volume: | 502 | ||||||||||||||||||||||||||||||
Number: | 1 | ||||||||||||||||||||||||||||||
Page Range: | L66-L71 | ||||||||||||||||||||||||||||||
DOI: | 10.1093/mnrasl/slaa189 | ||||||||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters following peer review. The version of record J B Lovell, G M Kennedy, S Marino, M C Wyatt, M Ansdell, M Kama, C F Manara, L Matrá, G Rosotti, M Tazzari, L Testi, J P Williams, Rapid CO gas dispersal from NO Lup’s class III circumstellar disc, Monthly Notices of the Royal Astronomical Society: Letters, 2020;, slaa189, is available online at: https://doi.org/10.1093/mnrasl/slaa189 | ||||||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||||||||
Date of first compliant deposit: | 29 January 2021 | ||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 29 January 2021 | ||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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