Mid-infrared circumstellar emission of the long-period Cepheid l Carinae resolved with VLTI/MATISSE
| Autor: | M. Schuil, G. Zins, Y. Fantei, Udo Beckmann, Péter Ábrahám, Anthony Meilland, K. Shabun, Philippe Stee, Farrokh Vakili, Ronald Roelfsema, A. Böhm, Andrea Chiavassa, G. Niccolini, L. Labadie, L. Mosoni, M. Riquelme, Alexandre Gallenne, P. Antonelli, R. Frahm, J.-L. Lizon, Markus Schöller, Ralf-Rainer Rohloff, Florentin Millour, Jean-Michel Clausse, Udo Neumann, F. Wrhel, M. de Haan, J. Meisner, Leonard Burtscher, R. Huerta, F. Allouche, Luca Pasquini, E. Garces, Pierre Cruzalèbes, Nicolas Nardetto, S. Morel, Behnam Javanmardi, P. Bourget, L. Jochum, A. Ridinger, R. S. Le Poole, Th. Rivinius, Bruno Lopez, V. Hocdé, Marco Delbo, I. Percheron, P. Girard, J. C. González Herrera, M. Accardo, G. Bazin, Karl Heinz Hofmann, Laszlo Szabados, J. W. Isbell, Eric Pantin, Jaime Alonso, Josef Hron, D. Schertl, Eszter Pozna, L. Klarmann, Th. Henning, S. Rousseau, C. Connot, E. Nußbaum, Eddy Elswijk, Louise Breuval, Antoine Mérand, R. van Boekel, E. Kokoulina, Leander Mehrgan, József Varga, Roberto Abuter, Markus Wittkowski, T. Adler, E. Lagadec, Claudia Paladini, M. Heininger, F. Guitton, Nicolas Schuhler, W. Laun, Romain Petrov, A. Jaskó, S. Abadie, R. ter Horst, Stephane Lagarde, R. Brast, F. Y. J. Gonté, Norbert Hubin, William C. Danchi, V. Gámez Rosas, A. Soulain, Walter Jaffe, Pierre Kervella, W. Boland, Ramón Navarro, Michiel R. Hogerheijde, Julien Woillez, K. Meixner, Felix Bettonvil, S. Borgniet, J. Beltran, Uwe Graser, Ph. Berio, Ralf Klein, J. Idserda, M. Lopez, Klaus Meisenheimer, Andreas Glindemann, J.-U. Pott, H. Hanenburg, Lars Venema, Sylvie Robbe-Dubois, Alexis Matter, Tibor Agócs, R. Buter, M. Ebert, Carsten Dominik, P. Guajardo, Laurent Pallanca, A. Marcotto, R. Waters, A. Gabasch, R. Castillo, M. Lehmitz, Jean-Charles Augereau, Derek Ives, Yves Bresson, S. Kuindersma, A. Glazenborg, Claudia Cid, C. Stephan, Sebastian Wolf, L. Mohr, J. Kragt, Christoph Leinert, F. Rigal, N. Tromp, Xavier Haubois, N. Mauclert, Gerd Jakob, Gerd Weigelt, J. Vinther, A. Chelli, C. Bailet, Paul Bristow, A. Domiciano de Souza, T. Maurer, A. van Duin, Ralf Conzelmann, M. Mellein, G. Kroes, G. Yoffe, T. Phan Duc |
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| Přispěvatelé: | Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Lagrange, Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS., European Southern Observatory (ESO), COMUE Université Côte d'Azur (2015 - 2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015 - 2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015 - 2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Radioastronomie (MPIFR), Max Planck Institute for Astronomy (MPIA), Leiden Observatory [Leiden], Universiteit Leiden [Leiden], Observatoire de la Côte d'Azur (OCA), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Low Energy Astrophysics (API, FNWI) |
| Rok vydání: | 2021 |
| Předmět: |
Infrared
Cepheid variable Astronomy Astrophysics - astrophysics of galaxies Flux FOS: Physical sciences Context (language use) Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Astrophysics - solar and stellar astrophysics 010309 optics Spitzer Space Telescope 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Spectroscopy 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Physics [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] Research Programm of Institute for Mathematics Astrophysics and Particle Physics Stars: variables: Cepheids [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] Astronomy and Astrophysics Circumstellar matter Infrared: stars [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] Stars Wavelength 13. Climate action Space and Planetary Science [SDU]Sciences of the Universe [physics] Instrumentation: interferometers Astrophysics of Galaxies (astro-ph.GA) Stars: atmospheres Astrophysics::Earth and Planetary Astrophysics |
| Zdroj: | Astronomy & Astrophysics, 651, 1-13 Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 651, pp.A92. ⟨10.1051/0004-6361/202140626⟩ Astronomy & Astrophysics, 651, pp. 1-13 Astronomy & Astrophysics, 651:A92. EDP Sciences |
| ISSN: | 1432-0746 0004-6361 |
| Popis: | The nature of circumstellar envelopes (CSE) around Cepheids is still a matter of debate. The physical origin of their infrared (IR) excess could be either a shell of ionized gas, or a dust envelope, or both. This study aims at constraining the geometry and the IR excess of the environment of the long-period Cepheid $\ell$ Car (P=35.5 days) at mid-IR wavelengths to understand its physical nature. We first use photometric observations in various bands and Spitzer Space Telescope spectroscopy to constrain the IR excess of $\ell$ Car. Then, we analyze the VLTI/MATISSE measurements at a specific phase of observation, in order to determine the flux contribution, the size and shape of the environment of the star in the L band. We finally test the hypothesis of a shell of ionized gas in order to model the IR excess. We report the first detection in the L band of a centro-symmetric extended emission around l Car, of about 1.7$R_\star$ in FWHM, producing an excess of about 7.0\% in this band. In the N band, there is no clear evidence for dust emission from VLTI/MATISSE correlated flux and Spitzer data. On the other side, the modeled shell of ionized gas implies a more compact CSE ($1.13\pm0.02\,R_\star$) and fainter (IR excess of 1\% in the L band). We provide new evidences for a compact CSE of $\ell$ Car and we demonstrate the capabilities of VLTI/MATISSE for determining common properties of CSEs. While the compact CSE of $\ell$ Car is probably of gaseous nature, the tested model of a shell of ionized gas is not able to simultaneously reproduce the IR excess and the interferometric observations. Further Galactic Cepheids observations with VLTI/MATISSE are necessary for determining the properties of CSEs, which may also depend on both the pulsation period and the evolutionary state of the stars. Comment: 13 pages, 8 figures, accepted in Astronomy and Astrophysics |
| Databáze: | OpenAIRE |
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