The combination of high-resolution and sensitivity offered by ALMA is revolutionizing our understanding of protoplanetary discs, as their bulk gas and dust distributions can be studied independently. In this paper we present resolved ALMA observations of the continuum emission (λ = 1.3 mm) and CO isotopologues (12CO, 13CO, C18O, J = 2 − 1) integrated intensity from the disc around the nearby (d = 162 pc), intermediate-mass (M = 1.67 M) pre-main-sequence star CQ Tau. The data show an inner depression in continuum and in both 13CO and C18O emission. We employ a thermo-chemical model of the disc reproducing both continuum and gas radial intensity profiles, together with the disc spectral energy distribution. The models show that a gas inner cavity with size between 15 and 25 au is needed to reproduce the data with a density depletion factor between ∼10−1 and ∼10−3. The radial profile of the distinct cavity in the dust continuum is described by a Gaussian ring centred at Rdust = 53 au and with a width of σ = 13 au. Three-dimensional gas and dust numerical simulations of a disc with an embedded planet at a separation from the central star of ∼20 au and with a mass of ∼6–9 MJup reproduce qualitatively the gas and dust profiles of the CQ Tau disc. However, a one-planet model appears not to be able to reproduce the dust Gaussian density profile predicted using the thermo-chemical modeling.

A dust and gas cavity in the disc around CQ Tau revealed by ALMA / M.G. Ubeira Gabellini, A. Miotello, S. Facchini, E. Ragusa, G. Lodato, L. Testi, M. Benisty, S. Bruderer, N. T.  Kurtovic, S. Andrews, J. Carpenter, S.A. Corder, G. Dipierro, B. Ercolano, D. Fedele, G. Guidi, T. Henning, A. Isella, W. Kwon, H. Linz, M. Mcclure, L. Perez, L. Ricci, G. Rosotti, M. Tazzari, D. Wilner. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 486:4(2019 Jul), pp. 4638-4654. [10.1093/mnras/stz1138]

A dust and gas cavity in the disc around CQ Tau revealed by ALMA

S. Facchini;G. Lodato;G. Rosotti;
2019

Abstract

The combination of high-resolution and sensitivity offered by ALMA is revolutionizing our understanding of protoplanetary discs, as their bulk gas and dust distributions can be studied independently. In this paper we present resolved ALMA observations of the continuum emission (λ = 1.3 mm) and CO isotopologues (12CO, 13CO, C18O, J = 2 − 1) integrated intensity from the disc around the nearby (d = 162 pc), intermediate-mass (M = 1.67 M) pre-main-sequence star CQ Tau. The data show an inner depression in continuum and in both 13CO and C18O emission. We employ a thermo-chemical model of the disc reproducing both continuum and gas radial intensity profiles, together with the disc spectral energy distribution. The models show that a gas inner cavity with size between 15 and 25 au is needed to reproduce the data with a density depletion factor between ∼10−1 and ∼10−3. The radial profile of the distinct cavity in the dust continuum is described by a Gaussian ring centred at Rdust = 53 au and with a width of σ = 13 au. Three-dimensional gas and dust numerical simulations of a disc with an embedded planet at a separation from the central star of ∼20 au and with a mass of ∼6–9 MJup reproduce qualitatively the gas and dust profiles of the CQ Tau disc. However, a one-planet model appears not to be able to reproduce the dust Gaussian density profile predicted using the thermo-chemical modeling.
astrochemistry; hydrodynamics; planet–disc interactions; protoplanetary discs
Settore FIS/05 - Astronomia e Astrofisica
Dust and gas in planet forming discs (DUSTBUSTER)
Article (author)
File in questo prodotto:
File Dimensione Formato  
Ubeira19a.pdf

accesso aperto

Tipologia: Pre-print (manoscritto inviato all'editore)
Dimensione 3.32 MB
Formato Adobe PDF
3.32 MB Adobe PDF Visualizza/Apri
stz1138.pdf

accesso riservato

Tipologia: Publisher's version/PDF
Dimensione 6.82 MB
Formato Adobe PDF
6.82 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/645083
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 20
  • ???jsp.display-item.citation.isi??? 20
social impact