Affiliation:
1. School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
Abstract
ABSTRACT
We present the first detection of the $^{13}\text{C}^{17}\text{O}$ J = 3–2 transition toward the HL Tau protoplanetary disc. We find significantly more gas mass (at least a factor of 10 higher) than has been previously reported using $\text{C}^{18}\text{O}$ emission. This brings the observed total disc mass to 0.2 M⊙, which we consider to be a conservative lower limit. Our analysis of the Toomre Q profile suggests that this brings the disc into the regime of gravitational instability. The radial region of instability (50–110 au) coincides with the location of a proposed planet-carved gap in the dust disc, and a spiral in the gas. We therefore propose that if the origin of the gap is confirmed to be due to a forming giant planet, then it is likely to have formed via the gravitational fragmentation of the protoplanetary disc.
Funder
Science and Technology Facilities Council
NSF
NINS
NRC
MOST
KASI
NAOJ
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
26 articles.
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