VLTI-MATISSE L- and N-band aperture-synthesis imaging of the unclassified B[e] star FS Canis Majoris
- Creators
- Hofmann, K. -H.
- Bensberg, A.
- Schertl, D.
- Weigelt, G.
- Wolf, S.
- Meilland, A.
- Millour, F.
- Waters, L. B. F. M.
- Kraus, S.
- Ohnaka, K.
- Lopez, B.
- Petrov, R. G.
- Lagarde, S.
- Berio, Ph.
- Allouche, F.
- Robbe-Dubois, S.
- Jaffe, W.
- Henning, Th.
- Paladini, C.
- Schöller, M.
- Mérand, A.
- Glindemann, A.
- Beckmann, U.
- Heininger, M.
- Bettonvil, F.
- Zins, G.
- Woillez, J.
- Bristow, P.
- Stee, P.
- Vakili, F.
- van Boekel, R.
- Hogerheijde, M. R.
- Dominik, C.
- Augereau, J. -C.
- Matter, A.
- Hron, J.
- Pantin, E.
- Rivinius, Th.
- de Wit, W. -J.
- Varga, J.
- Klarmann, L.
- Meisenheimer, K.
- Gámez Rosas, V.
- Burtscher, L.
- Leftley, J.
- Isbell, J. W.
- Yoffe, G.
- Kokoulina, E.
- Danchi, W. C.
- Cruzalèbes, P.
- Domiciano de Souza, A.
- Drevon, J.
- Hocdé, V.
- Kreplin, A.
- Labadie, L.
- Connot, C.
- Nussbaum, E.
- Lehmitz, M.
- Antonelli, P.
- Graser, U.
- Leinert, C.
- Others:
- Joseph Louis LAGRANGE (LAGRANGE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
- Institut de biologie et chimie des protéines [Lyon] (IBCP) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
- Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) ; Centre National d'Études Spatiales [Toulouse] (CNES)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ) ; Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France -Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France
Description
Context. FS Canis Majoris (FS CMa, HD 45677) is an unclassified B[e] star surrounded by an inclined dust disk. The evolutionary stage of FS CMa is still debated. Perpendicular to the circumstellar disk, a bipolar outflow was detected. Infrared aperture-synthesis imaging provides us with a unique opportunity to study the disk structure.
Aims: Our aim is to study the intensity distribution of the disk of FS CMa in the mid-infrared L and N bands.
Methods: We performed aperture-synthesis imaging of FS CMa with the MATISSE instrument (Multi AperTure mid-Infrared SpectroScopic Experiment) in the low spectral resolution mode to obtain images in the L and N bands. We computed radiative transfer models that reproduce the L- and N-band intensity distributions of the resolved disks.
Results: We present L- and N-band aperture-synthesis images of FS CMa reconstructed in the wavelength bands of 3.4-3.8 and 8.6-9.0 μm. In the L-band image, the inner rim region of an inclined circumstellar disk and the central object can be seen with a spatial resolution of 2.7 milliarcsec (mas). An inner disk cavity with an angular diameter of ~6 × 12 mas is resolved. The L-band disk consists of a bright northwestern (NW) disk region and a much fainter southeastern (SE) region. The images suggest that we are looking at the bright inner wall of the NW disk rim, which is on the far side of the disk. In the N band, only the bright NW disk region is seen. In addition to deriving the inclination and the inner disk radius, fitting the reconstructed brightness distributions via radiative transfer modelling allows one to constrain the innermost disk structure, in particular the shape of theinner disk rim.
Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere within the commissioning of the VLTI-MATISSE instrument (ID 60.A-9257(E)).
Abstract
International audience
Additional details
- URL
- https://hal-insu.archives-ouvertes.fr/insu-03656928
- URN
- urn:oai:HAL:insu-03656928v1
- Origin repository
- UNICA