2018A&A...614A.113H


Query : 2018A&A...614A.113H

2018A&A...614A.113H - Astronomy and Astrophysics, volume 614A, 113-113 (2018/6-1)

ALMA detection of a tentative nearly edge-on rotating disk around the nearby AGB star R Doradus.

HOMAN W., DANILOVICH T., DECIN L., DE KOTER A., NUTH J. and VAN DE SANDE M.

Abstract (from CDS):

A spectral scan of the circumstellar environment of the asymptotic giant branch (AGB) star R Doradus was taken with ALMA in cycle 2 at frequencies between 335 and 362 GHz and with a spatial resolution of ∼150 milliarcseconds. Many molecular lines show a spatial offset between the blue and red shifted emission in the innermost regions of the wind. The position-velocity diagrams of this feature, in combination with previous SPHERE data and theoretical work point towards the presence of a compact differentially rotating disk, orientated nearly edge-on. We model the 28SiO (v = 1, J = 8 - 7) emission with a disk model. We estimate the disk mass and angular momentum to be 3 x 10–6 M and 5 x 1040 m2 kg s–1. The latter presents an "angular momentum problem" that may be solved by assuming that the disk is the result of wind-companion interactions with a companion of at least 2.5 earth masses, located at 6 AU, the tentatively determined location of the disk's inner rim. An isolated clump of emission is detected to the south-east with a velocity that is high compared to the previously determined terminal velocity of the wind. Its position and mean velocity suggest that it may be associated with a companion planet, located at the disk's inner rim.

Abstract Copyright: © ESO 2018

Journal keyword(s): radiative transfer - stars: AGB and post-AGB - circumstellar matter - submillimeter: stars

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* R Scl C* 01 26 58.0946233986 -32 32 35.437732667 17.26 9.59 5.72 3.69 2.30 C-N5+ 306 0
2 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1466 0
3 V* R Dor AB* 04 36 45.59127 -62 04 37.7974 7.84 6.98 5.40 2.71 -0.44 M8III:e 302 0
4 * L02 Pup AB* 07 13 32.3181035 -44 38 23.062946 7.90 6.66 5.10 2.49 0.07 M5IIIe 199 0
5 V* RS Cnc S* 09 10 38.7978379 +30 57 47.295961 8.65 7.62 5.95 3.06 0.73 M6S 302 0
6 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2201 0
7 V* RW LMi C* 10 16 02.2834693816 +30 34 18.977096332       15.27   C4,3e 384 0

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2021.07.31-08:02:54

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