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ATOMIUM: The astounding complexity of the near circumstellar environment of the M-type AGB star R Hydrae. I. Morpho-kinematical interpretation of CO and SiO emission

dc.contributor.authorHOMAN, Ward
dc.contributor.authorPIMPANUWAT, Bannawit
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorHERPIN, Fabrice
dc.contributor.authorDANILOVICH, Taissa
dc.contributor.authorMCDONALD, Iain
dc.contributor.authorWALLSTRÖM, Sofia H. J.
dc.contributor.authorRICHARDS, Anita M. S.
dc.contributor.authorBAUDRY, Alain
dc.contributor.authorSAHAI, Raghvendra
dc.contributor.authorMILLAR, Tom J.
dc.contributor.authorDE KOTER, Alex
dc.contributor.authorGOTTLIEB, C. A.
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorKERVELLA, Pierre
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorMONTARGÈS, Miguel
dc.contributor.authorVAN DE SANDE, Marie
dc.contributor.authorDECIN, Leen
dc.contributor.authorZIJLSTRA, Albert
dc.contributor.authorETOKA, Sandra
dc.contributor.authorJESTE, Manali
dc.contributor.authorMÜLLER, Holger S. P.
dc.contributor.authorMAES, Silke
dc.contributor.authorMALFAIT, Jolien
dc.contributor.authorMENTEN, Karl
dc.contributor.authorPLANE, John
dc.contributor.authorLEE, Kelvin
dc.contributor.authorWATERS, Rens
dc.contributor.authorWONG, Ka Tat
dc.contributor.authorLAGADEC, Eric
dc.contributor.authorGOBRECHT, David
dc.contributor.authorYATES, Jeremy
dc.contributor.authorPRICE, Daniel
dc.contributor.authorCANNON, Emily
dc.contributor.authorBOLTE, Jan
dc.contributor.authorDE CEUSTER, Frederik
dc.contributor.authorNUTH, Joe
dc.contributor.authorPHILIP SINDEL, Jan
dc.contributor.authorKEE, Dylan
dc.contributor.authorGRAY, Malcolm D.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorEL MELLAH, Ileyk
dc.date.issued2021
dc.identifier.issn0004-6361
dc.description.abstractEnEvolved low- to intermediate-mass stars are known to shed their gaseous envelope into a large, dusty, molecule-rich circumstellar nebula which typically develops a high degree of structural complexity. Most of the large-scale, spatially correlated structures in the nebula are thought to originate from the interaction of the stellar wind with a companion. As part of the ATOMIUM large programme, we observed the M-type asymptotic giant branch (AGB) star R Hydrae with the Atacama Large Millimeter/submillimeter Array. The morphology of the inner wind of R Hya, which has a known companion at ∼3500 au, was determined from maps of CO and SiO obtained at high angular resolution. A map of the CO emission reveals a multi-layered structure consisting of a large elliptical feature at an angular scale of ∼10″ that is oriented along the north-south axis. The wind morphology within the elliptical feature is dominated by two hollow bubbles. The bubbles are on opposite sides of the AGB star and lie along an axis with a position angle of ∼115°. Both bubbles are offset from the central star, and their appearance in the SiO channel maps indicates that they might be shock waves travelling through the AGB wind. An estimate of the dynamical age of the bubbles yields an age of the order of 100 yr, which is in agreement with the previously proposed elapsed time since the star last underwent a thermal pulse. When the CO and SiO emission is examined on subarcsecond angular scales, there is evidence for an inclined, differentially rotating equatorial density enhancement, strongly suggesting the presence of a second nearby companion. The position angle of the major axis of this disc is ∼70° in the plane of the sky. We tentatively estimate that a lower limit on the mass of the nearby companion is ∼0.65 M<SUB>⊙</SUB> on the basis of the highest measured speeds in the disc and the location of its inner rim at ∼6 au from the AGB star.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enstars: AGB and post-AGB
dc.subject.encircumstellar matter
dc.subject.ensubmillimeter: stars
dc.title.enATOMIUM: The astounding complexity of the near circumstellar environment of the M-type AGB star R Hydrae. I. Morpho-kinematical interpretation of CO and SiO emission
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/202140512
dc.subject.halPlanète et Univers [physics]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv2104.07297
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.volume651
bordeaux.peerReviewedoui
hal.identifierinsu-03678883
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//insu-03678883v1
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