Radio-continuum decrements associated to shadowing from the central warp in transition disc DoAr 44

Author:

Arce-Tord Carla123ORCID,Casassus Simon134ORCID,Dent William R F5,Pérez Sebastián637ORCID,Cárcamo Miguel897ORCID,Weber Philipp637ORCID,Engler Natalia10,Cieza Lucas A311,Hales Antonio512,Zurlo Alice31113ORCID,Marino Sebastian14ORCID

Affiliation:

1. Departamento de Astronomía, Universidad de Chile , Santiago, 7591245 , Chile

2. European Southern Observatory , Alonso de Cordova 3107, Santiago, 7630355 , Chile

3. Millennium Nucleus on Young Exoplanets and their Moons (YEMS) , Santiago, 9170124 , Chile

4. Data Observatory Foundation , Santiago de Chile, 7500644 , Chile

5. Joint ALMA Observatory , Alonso de Cordova 3107, Santiago, 7630355 , Chile

6. Departamento de Física, Universidad de Santiago de Chile , Av. Victor Jara 3659, Santiago, 9170124 , Chile

7. Center for Interdisciplinary Research in Astrophysics and Space Exploration (CIRAS), Universidad de Santiago de Chile , Santiago, 9170124 , Chile

8. Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester , SK11 9DL, Manchester , UK

9. University of Santiago of Chile (USACH), Faculty of Engineering , Computer Engineering Department, Santiago, 9170124 , Chile

10. ETH Zurich, Institute for Particle Physics and Astrophysics , Wolfgang-Pauli-Strasse 27, CH-8093 Zurich , Switzerland

11. Núcleo de Astronomía, Facultad de Ingeniería y Ciencias, Universidad Diego Portales , Av. Ejercito 441, Santiago, 8370007 , Chile

12. National Radio Astronomy Observatory , 520 Edgemont Road, Charlottesville VA 22903-2475 , USA

13. Escuela de Ingeniería Industrial, Facultad de Ingeniería y Ciencias, Universidad Diego Portales , Av. Ejercito 441, Santiago, 8370007 , Chile

14. Department of Physics and Astronomy, University of Exeter , Stocker Road, Exeter EX4 4QL , UK

Abstract

ABSTRACT Warps have often been used to explain disc properties, but well-characterized examples are important due to their role in disc evolution. Scattered light images of discs with central gaps have revealed sharp warps, such that the outer rings are shadowed by tilted inner discs. The near-infrared intensity drops along the ring around T-Tauri star DoAr 44 have been interpreted in terms of a central warp. We report new ALMA observations of DoAr 44 in the continuum at 230 and 350 GHz (at ∼10 au), along with a new epoch of Spectro Polarimetric High-contrast Exoplanet REsearch (SPHERE)/Infrared Dual-band Imager and Spectrograph differential polarized imaging taken during excellent weather conditions. The ALMA observations resolve the ring and confirm the decrements proposed from deconvolution of coarse 336 GHz data. The scattered light image constrains the dips, which correspond to a misaligned inner disc with a relative inclination ξ = 21.4 $^{+6.7}_{-8.3}$ deg. The SPHERE intensity profile shows a morphological change compared to a previous epoch that may be interpreted as a variable orientation of the inner disc, from ξ ∼ 30 deg to ξ ∼ 20 deg. The intensity dips probably correspond to temperature decrements, as their mm-spectral index, $\alpha ^{230 \textrm {GHz}}_{350 \textrm {GHz}} \sim$ 2.0 ± 0.1, is indicative of optically thick emission. The azimuth of the two temperature decrements are leading clockwise relative to the infrared-dips, by η = 14.95 deg and η = 7.92 deg. For a retrograde disc, such shifts are expected from a thermal lag and imply gas surface densities of Σg = 117 ± 10 g cm−2 and Σg = 48 ± 10 g cm−2. A lopsided disc, with contrast ratio fr = 2.4 ± 0.5, is also consistent with the large continuum crescent.

Funder

ANID

Fondo Nacional de Desarrollo Científico y Tecnológico

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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