Planet formation imprints signatures on the physical structures of disks. In this paper, we present high-resolution (∼50 mas, 8 au) Atacama Large Millimeter/submillimeter Array observations of 1.3 mm dust continuum and CO line emission toward the disk around the M3.5 star 2MASS J04124068+2438157. The dust disk consists of only two narrow rings at radial distances of 0.″47 and 0.″78 (∼70 and 116 au), with Gaussian σ widths of 5.6 and 8.5 au, respectively. The width of the outer ring is smaller than the estimated pressure scale height by ∼25%, suggesting dust trapping in a radial pressure bump. The dust disk size, set by the location of the outermost ring, is significantly larger (by 3σ) than other disks with similar millimeter luminosity, which can be explained by an early formation of local pressure bump to stop radial drift of millimeter dust grains. After considering the disk’s physical structure and accretion properties, we prefer planet-disk interaction over dead zone or photoevaporation models to explain the observed dust disk morphology. We carry out high-contrast imaging at the L ′ band using Keck/NIRC2 to search for potential young planets, but do not identify any source above 5σ. Within the dust gap between the two rings, we reach a contrast level of ∼7 mag, constraining the possible planet below ∼2-4 M Jup. Analyses of the gap/ring properties suggest that an approximately Saturn-mass planet at ∼90 au is likely responsible for the formation of the outer ring, which can potentially be revealed with JWST.

A Large Double-ring Disk Around the Taurus M Dwarf J04124068+2438157 / F. Long, B.B. Ren, N.L. Wallack, D. Harsono, G.J. Herczeg, P. Pinilla, D. Mawet, M.C. Liu, S.M. Andrews, X. Bai, S. Cabrit, L.A. Cieza, D. Johnstone, J.M. Leisenring, G. Lodato, Y. Liu, C.F. Manara, G.D. Mulders, E. Ragusa, S. Sallum, Y. Shi, M. Tazzari, T. Uyama, K. Wagner, D.J. Wilner, J.W. Xuan. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 1538-4357. - 949:1(2023), pp. 27.1-27.14. [10.3847/1538-4357/acc843]

A Large Double-ring Disk Around the Taurus M Dwarf J04124068+2438157

G. Lodato
Membro del Collaboration Group
;
E. Ragusa;
2023

Abstract

Planet formation imprints signatures on the physical structures of disks. In this paper, we present high-resolution (∼50 mas, 8 au) Atacama Large Millimeter/submillimeter Array observations of 1.3 mm dust continuum and CO line emission toward the disk around the M3.5 star 2MASS J04124068+2438157. The dust disk consists of only two narrow rings at radial distances of 0.″47 and 0.″78 (∼70 and 116 au), with Gaussian σ widths of 5.6 and 8.5 au, respectively. The width of the outer ring is smaller than the estimated pressure scale height by ∼25%, suggesting dust trapping in a radial pressure bump. The dust disk size, set by the location of the outermost ring, is significantly larger (by 3σ) than other disks with similar millimeter luminosity, which can be explained by an early formation of local pressure bump to stop radial drift of millimeter dust grains. After considering the disk’s physical structure and accretion properties, we prefer planet-disk interaction over dead zone or photoevaporation models to explain the observed dust disk morphology. We carry out high-contrast imaging at the L ′ band using Keck/NIRC2 to search for potential young planets, but do not identify any source above 5σ. Within the dust gap between the two rings, we reach a contrast level of ∼7 mag, constraining the possible planet below ∼2-4 M Jup. Analyses of the gap/ring properties suggest that an approximately Saturn-mass planet at ∼90 au is likely responsible for the formation of the outer ring, which can potentially be revealed with JWST.
Settore FIS/05 - Astronomia e Astrofisica
   Winds ANd Disk structures near and Afar
   WANDA
   European Commission
   Horizon Europe Framework Programme
   101039452

   Predictions and Observations for Discs: Planetary Cores and dust Aggregates from non-ideal MHD Simulations with radiative Transfer.
   PODCAST
   European Commission
   Horizon 2020 Framework Programme
   864965

   Establishing a global observational view of the early stages of planet formation and evolution
   PROTOPLANETS
   European Commission
   Horizon 2020 Framework Programme
   101002188
2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/978872
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