T CrA has a companion
Astronomy and Astrophysics, vol. 695, pp. L21
Abstract
T CrA is a Herbig Ae-type young star in a complex circumstellar environment; it includes a circumstellar disk, accretion streamers, jets, and outflows. It has long been suspected to be a binary. However, until now, there has been no direct detection of a companion. Here we present new VLTI/MATISSE L - and N -band observations of T CrA taken between 2023 May and 2024 August with the aim of testing the binary nature of the system. We modeled the data with a geometric model using the Python tool oimodeler . We detected a companion (T CrA B) with a projected separation of Δ r = 153.2 ± 1.2 mas (≈23 au) toward the west direction at a position angle of 275.4 ± 0.1°, in 2024 May–August. Our results support that the companion has a nearly edge-on orbit that is highly misaligned with respect to the circumprimary disk. Such a configuration could cause warping and tearing of the disk around the primary, which has been proposed by recent studies. In the L band the companion is extended, with a full width at half maximum (FWHM) size of ∼1 au, suggesting that the emission comes from a disk around the secondary star. The companion flux is 0.2–0.3 Jy in the L band, and 0.2–0.7 Jy in the N band, accounting for 4–20% of the total emission at those wavelengths. The SED of the companion is compatible with thermal radiation of warm dust (600–800 K).
Authors 21
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Konkoly Observatory · HUN-REN Research Centre for Astronomy and Earth Sciences
Affiliation as printed
CSFK, MTA Centre of Excellence
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, HUN-REN
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Centre National de la Recherche Scientifique · Université Côte d'Azur · Lagrange Laboratory · Observatoire de la Côte d’Azur
Affiliation as printed
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange
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Centre National de la Recherche Scientifique · Université Côte d'Azur · Lagrange Laboratory · Observatoire de la Côte d’Azur
Affiliation as printed
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange
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Max Planck Institute for Radio Astronomy
Affiliation as printed
Max-Planck-Institut für Radioastronomie
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Max Planck Institute for Astronomy
Affiliation as printed
Max Planck Institute for Astronomy
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Konkoly Observatory · HUN-REN Research Centre for Astronomy and Earth Sciences
Affiliation as printed
CSFK, MTA Centre of Excellence
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, HUN-REN
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Eötvös Loránd University · Konkoly Observatory · Max Planck Institute for Astronomy · HUN-REN Research Centre for Astronomy and Earth Sciences
Affiliation as printed
CSFK, MTA Centre of Excellence
ELTE Eötvös Loránd University, Institute of Physics
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, HUN-REN
Max Planck Institute for Astronomy
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Konkoly Observatory · HUN-REN Research Centre for Astronomy and Earth Sciences
Affiliation as printed
CSFK, MTA Centre of Excellence
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, HUN-REN
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Max Planck Institute for Astronomy
Affiliation as printed
Max Planck Institute for Astronomy
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Leiden University · Leiden Observatory · University of Amsterdam
Affiliation as printed
Anton Pannekoek Institute for Astronomy, University of Amsterdam
Leiden Observatory, Leiden University
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Konkoly Observatory · HUN-REN Research Centre for Astronomy and Earth Sciences
Affiliation as printed
CSFK, MTA Centre of Excellence
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, HUN-REN
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Eötvös Loránd University · University of Vienna · Konkoly Observatory · HUN-REN Research Centre for Astronomy and Earth Sciences
Affiliation as printed
CSFK, MTA Centre of Excellence
ELTE Eötvös Loránd University, Institute of Physics
Institute for Astronomy (IfA), University of Vienna
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, HUN-REN
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Centre National de la Recherche Scientifique · Institut de Planétologie et d'Astrophysique de Grenoble · Université Grenoble Alpes
Affiliation as printed
Univ. Grenoble Alpes, CNRS, IPAG
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Centre National de la Recherche Scientifique · Konkoly Observatory · HUN-REN Research Centre for Astronomy and Earth Sciences · Institut de Recherche en Astrophysique et Planétologie · Université de Toulouse
Affiliation as printed
CSFK, MTA Centre of Excellence
Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, UT3-PS, CNRS, CNES
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, HUN-REN
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Goddard Space Flight Center · Astrophysics Division
Affiliation as printed
NASA Goddard Space Flight Center, Astrophysics Division
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Max Planck Institute for Astronomy
Affiliation as printed
Max Planck Institute for Astronomy
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Centre National de la Recherche Scientifique · Institut de Planétologie et d'Astrophysique de Grenoble · Université Grenoble Alpes
Affiliation as printed
Univ. Grenoble Alpes, CNRS, IPAG
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Max Planck Institute for Astronomy
Affiliation as printed
Max Planck Institute for Astronomy
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Centre National de la Recherche Scientifique · Université Côte d'Azur · Lagrange Laboratory · Observatoire de la Côte d’Azur
Affiliation as printed
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange
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Leiden University · Leiden Observatory
Affiliation as printed
Leiden Observatory, Leiden University
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Konkoly Observatory · HUN-REN Research Centre for Astronomy and Earth Sciences
Affiliation as printed
CSFK, MTA Centre of Excellence
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, HUN-REN
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