Volume 632, December 2019
|Number of page(s)||13|
|Section||Interstellar and circumstellar matter|
|Published online||22 November 2019|
Investigating the nature of the extended structure around the Herbig star RCrA using integral field and high-resolution spectroscopy
INAF/Osservatorio Astronomico di Padova,
Vicolo dell’osservatorio 5,
35122 Padova, Italy
2 Université Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
3 INAF – Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131 Napoli, Italy
4 INAF – Osservatorio Astronomico di Roma, Via di Frascati 33, 00078 Monte Porzio Catone, Italy
5 INAF – Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
6 INCT, Universidad De Atacama, calle Copayapu 485, Copiapó, Atacama, Chile
7 Aix-Marseille Université, CNRS, CNES LAM, Marseille, France
8 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
9 AlbaNova University Center, Stockholm University, Stockholm, Sweden
10 Université Lyon, Université Lyon 1, ENS de Lyon, CNRS, CRAL UMR 5574, 69230 Saint-Genis-Laval, France
11 Geneva Observatory, University of Geneva, Chemin des Maillettes, Switzerland
12 Dipartimento di Fisica, Universitá Degli Studi di Milano, Via Celoria, 16, 20133 Milano, Italy
13 Nucleo de Astronomia, Facultad de Ingenieria y Ciencias, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile
14 Escuela de Ingenieria Industrial, Facultad de Ingenieria y Ciencias, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile
15 Université Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
16 LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, France
17 NOVA Optical Infrared Instrumentation Group, Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, The Netherlands
18 Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290 Versoix, Switzerland
Accepted: 28 September 2019
Context. We present a detailed analysis of the extended structure detected around the young and close-by Herbig Ae/Be star R CrA. This is a young triple system with an intermediate mass central binary whose separation is of the order of a few tens of the radii of the individual components, and an M-star companion at about 30 au.
Aims. Our aim is to understand the nature of the extended structure by means of combining integral-field and high-resolution spectroscopy.
Methods. We conducted the analysis based on FEROS archival optical spectroscopy data and adaptive optics images and integral-field spectra obtained with SINFONI and SPHERE at the VLT.
Results. The observations reveal a complex extended structure that is composed of at least two components: a non-uniform wide cavity whose walls are detected in continuum emission up to 400 au, and a collimated wiggling-jet detected in the emission lines of helium and hydrogen. Moreover, the presence of [Fe II] emission projected close to the cavity walls suggests the presence of a slower moving wind, most likely a disk wind. The multiple components of the optical forbidden lines also indicate the presence of a high-velocity jet co-existing with a slow wind. We constructed a geometrical model of the collimated jet flowing within the cavity using intensity and velocity maps, finding that its wiggling is consistent with the orbital period of the central binary. The cavity and the jet do not share the same position angle, suggesting that the jet is itself experiencing a precession motion possibly due to the wide M-dwarf companion.
Conclusions. We propose a scenario that closely agrees with the general expectation of a magneto-centrifugal-launched jet. These results build upon the extensive studies already conducted on R CrA.
Key words: stars: pre-main sequence / protoplanetary disks / Herbig-Haro objects / ISM: jets and outflows / ISM: individual objects: R CrA
© ESO 2019
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