TY - JOUR
T1 - ALMA detection of a tentative nearly edge-on rotating disk around the nearby AGB star R Doradus
AU - Homan, Ward
AU - Danilovich, Taissa
AU - Decin, Leen
AU - De Koter, Alex
AU - Nuth, Joseph
AU - Van De Sande, Marie
N1 - Funding Information:
cA knowledgements. W.H. acknowledges support from the Fonds voor Weten-schappelijk Onderzoek Vlaanderen (FWO). LD acknowledge support from the ERC consolidator grant 646758 AEROSOL. TD acknowledges support from the FWO Research Project grant G024112N. This paper makes use of the following ALMA data: ADS/JAO.ALMA2013.0.00166.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ.
Publisher Copyright:
© 2018 ESO.
PY - 2018/6/1
Y1 - 2018/6/1
N2 - 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 × 10-6 M· and 5 × 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.
AB - 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 × 10-6 M· and 5 × 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.
KW - Circumstellar matter
KW - Radiative transfer
KW - Stars: AGB and post-AGB
KW - Submillimeter: stars
UR - http://www.scopus.com/inward/record.url?scp=85048029309&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/201732246
DO - 10.1051/0004-6361/201732246
M3 - Article
AN - SCOPUS:85048029309
SN - 0004-6361
VL - 614
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
M1 - A113
ER -