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The asymmetric structure of the inner disc around HD 142527 A with VLTI/MATISSE

Context. Circumstellar discs, and especially their inner regions, which cover ranges from less than 1 au to a few au, are the birthplaces of terrestrial planets. The inner regions are thought to be as diverse in structure as the well-observed outer regions probed by ALMA. Aims. By combining data and...

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Autori principali: Scheuck, Marten Beatus (Autore) , Boekel, R. van (Autore) , Henning, Thomas (Autore) , Boley, P. A. (Autore) , Varga, J. (Autore) , Matter, A. (Autore) , Penzlin, A. (Autore) , Leftley, J. H. (Autore) , Haastere, L. van (Autore) , Perraut, K. (Autore) , Labadie, L. (Autore) , Min, M. (Autore) , Berger, J. P. (Autore) , Waters, L. B. F. M. (Autore) , Zieba, S. (Autore) , Lopez, B. (Autore) , Lykou, F. (Autore) , Augereau, J.-C. (Autore) , Cruzalèbes, P. (Autore) , Danchi, W. C. (Autore) , Rosas, V. Gámez (Autore) , Hogerheijde, M. (Autore) , Letessier, M. (Autore) , Scigliuto, J. (Autore) , Weigelt, G. (Autore) , Wolf, S. (Autore)
Natura: Article (Journal)
Lingua:inglese
Pubblicazione: April 2026
In: Astronomy and astrophysics
Year: 2026, Volume: 708, Pages: 1-22
ISSN:1432-0746
DOI:10.1051/0004-6361/202556795
Accesso online:Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202556795
Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2026/04/aa56795-25/aa56795-25.html
Testo
Note sull'autore:M.B. Scheuck, R. van Boekel, Th Henning, P.A. Boley, J. Varga, A. Matter, A. Penzlin, J.H. Leftley, L. van Haastere, K. Perraut, L. Labadie, M. Min, J.P. Berger, L.B.F.M. Waters, S. Zieba, B. Lopez, F. Lykou, J.-C. Augereau, P. Cruzalèbes, W.C. Danchi, V. Gámez Rosas, M. Hogerheijde, M. Letessier, J. Scigliuto, G. Weigelt, S. Wolf, and the MATISSE and GRAVITY collaborations
Descrizione
Riassunto:Context. Circumstellar discs, and especially their inner regions, which cover ranges from less than 1 au to a few au, are the birthplaces of terrestrial planets. The inner regions are thought to be as diverse in structure as the well-observed outer regions probed by ALMA. Aims. By combining data and results from previous studies using the VLTI/PIONIER and VLTI/GRAVITY instruments with new, multi-epoch VLTI/MATISSE observations, we aim to provide a comprehensive picture of the structure of the inner regions of the circumstellar disc around the F-type Herbig Ae/Be star HD 142527 A, the primary of a binary star system. Methods. We modelled the multi-wavelength interferometric data using a parametrised, geometrically thin disc model, allowing for azimuthal asymmetry, and exploring a first-order disc modulation and an off-centre Gaussian component. Results. We find time-variable structures in the N-band observables, which we reproduce with time-dependent models. This variability manifests as azimuthally asymmetric emission, evidenced by strong, non-zero closure phases in the N-band data. Fits to individual epochs of the N-band observations yield better χ2r values than fits to all epochs simultaneously. This suggests substantial changes in the geometry of the inner disc emission from ∼1 au up to a few astronomical-unit scales from one year to the next. Moreover, our models produce a very close-in inner disc rim R rim ≈ 0.1 au. Altogether, we find a very complex, substantially non-point symmetric and temporally variable disc (r out ≲ 6 au) around the primary. Conclusions. The very close-in inner rim indicates the presence of material within the typical wall-like sublimation radius, R rim,literature ≈ 0.3 au. The complex, temporally variable inner-disc geometry is likely affected, or even caused by, the close passage (∼5 au) and short orbit (P ≈ 24 yr) of the companion HD 142527 B.
Descrizione del documento:Online veröffentlicht: 24. April 2026
Gesehen am 16.06.2026
Descrizione fisica:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202556795

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