ALMA observations of the nearby AGB star L2 Puppis: II. Gas disk properties derived from 12CO and 13CO J = 3-2 emission

Ward Homan, Anita Richards, Leen Decin, Pierre Kervella, Alex De Koter, Iain McDonald, Keiichi Ohnaka

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

21 Citas (Scopus)

Resumen

The circumstellar environment of the AGB star L2 Puppis was observed with ALMA in cycle 3, with a resolution of 15 × 18 mas. The molecular emission shows a differentially rotating disk, inclined to a nearly edge-on position. In the first paper in this series (Paper I) the molecular emission was analysed to accurately deduce the motion of the gas in the equatorial regions of the disk. In this work we model the optically thick 12CO J = 3-2 and the optically thin 13CO J = 3-2 rotational transition to constrain the physical conditions in the disk. To realise this effort we make use of the 3D NLTE radiative transfer code LIME. The temperature structure and velocity structure show a high degree of complexity, both radially and vertically. The radial H2 density profile in the disk plane is characterised by a power law with a slope of -3.1. We find a 12CO over 13CO abundance ratio of 10 inside the disk. Finally, estimations of the angular momentum in the disk surpass the expected available angular momentum of the star, strongly supporting the indirect detection of a compact binary companion reported in Paper I. We estimate the mass of the companion to be around 1 Jupiter mass.

Idioma originalInglés
Número de artículoA5
PublicaciónAstronomy and Astrophysics
Volumen601
DOI
EstadoPublicada - 1 may 2017
Publicado de forma externa

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

Huella

Profundice en los temas de investigación de 'ALMA observations of the nearby AGB star L<sub>2</sub> Puppis: II. Gas disk properties derived from <sup>12</sup>CO and <sup>13</sup>CO J = 3-2 emission'. En conjunto forman una huella única.

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