Homan, Ward, Montarges, Miguel, Pimpanuwat, Bannawit, Richards, Anita M. S., Wallstrom, Sofia H. J., Kervella, Pierre, Decin, Leen, Zijlstra, Albert, Danilovich, Taissa, de Koter, Alex, Menten, Karl, Sahai, Raghvendra, Plane, John, Lee, Kelvin, Waters, Rens, Baudry, Alain, Tat Wong, Ka, Millar, Tom J., Van de Sande, Marie, Lagadec, Eric, Gobrecht, David, Yates, Jeremy, Price, Daniel, Cannon, Emily, Bolte, Jan, De Ceuster, Frederik, Herpin, Fabrice, Nuth, Joe, Philip Sindel, Jan, Kee, Dylan, Grey, Malcolm D., Etoka, Sandra, Jeste, Manali, Gottlieb, Carl A., Gottlieb, Elaine, McDonald, Iain, El Mellah, Ileyk and Mueller, Holger S. P. (2020). ATOMIUM: A high-resolution view on the highly asymmetric wind of the AGB star pi(1)Gruis: I. First detection of a new companion and its effect on the inner wind. Astron. Astrophys., 644. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

The nebular circumstellar environments of cool evolved stars are known to harbour a rich morphological complexity of gaseous structures on different length scales. A large part of these density structures are thought to be brought about by the interaction of the stellar wind with a close companion. The S-type asymptotic giant branch (AGB) star pi (1)Gruis, which has a known companion at similar to 440 au and is thought to harbour a second, closer-by (< 10 au) companion, was observed with the Atacama Large Millimeter/submillimeter Array as part of the ATOMIUM Large programme. In this work, the brightest CO, SiO, and HCN molecular line transitions are analysed. The continuum map shows two maxima, separated by 0.04<double prime> (6 au). The CO data unambiguously reveal that pi (1)Gru's circumstellar environment harbours an inclined, radially outflowing, equatorial density enhancement. It contains a spiral structure at an angle of similar to 38 +/- 3 degrees with the line-of-sight. The HCN emission in the inner wind reveals a clockwise spiral, with a dynamical crossing time of the spiral arms consistent with a companion at a distance of 0.04 '' from the AGB star, which is in agreement with the position of the secondary continuum peak. The inner wind dynamics imply a large acceleration region, consistent with a beta-law power of similar to 6. The CO emission suggests that the spiral is approximately Archimedean within 5 '', beyond which this trend breaks down as the succession of the spiral arms becomes less periodic. The SiO emission at scales smaller than 0.5 '' exhibits signatures of gas in rotation, which is found to fit the expected behaviour of gas in the wind-companion interaction zone. An investigation of SiO maser emission reveals what could be a stream of gas accelerating from the surface of the AGB star to the companion. Using these dynamics, we have tentatively derived an upper limit on the companion mass to be similar to 1.1 M-circle dot.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Homan, WardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Montarges, MiguelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pimpanuwat, BannawitUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Richards, Anita M. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wallstrom, Sofia H. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kervella, PierreUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Decin, LeenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zijlstra, AlbertUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Danilovich, TaissaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Koter, AlexUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menten, KarlUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sahai, RaghvendraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Plane, JohnUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lee, KelvinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Waters, RensUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baudry, AlainUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tat Wong, KaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Millar, Tom J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Van de Sande, MarieUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lagadec, EricUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gobrecht, DavidUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yates, JeremyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Price, DanielUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cannon, EmilyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bolte, JanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
De Ceuster, FrederikUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herpin, FabriceUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nuth, JoeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Philip Sindel, JanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kee, DylanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grey, Malcolm D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Etoka, SandraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jeste, ManaliUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gottlieb, Carl A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gottlieb, ElaineUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
McDonald, IainUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
El Mellah, IleykUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mueller, Holger S. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-310064
DOI: 10.1051/0004-6361/202039185
Journal or Publication Title: Astron. Astrophys.
Volume: 644
Date: 2020
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
BIPOLAR PREPLANETARY NEBULAE; MASS-LOSS; S-STARS; CIRCUMSTELLAR ENVELOPES; PLANETARY-NEBULA; ELECTRIC-DIPOLE; BINARY-SYSTEMS; DUSTY WINDS; RED GIANTS; SIOMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/31006

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