The asymmetric structure of the inner disc around HD 142527 A with VLTI/MATISSE
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arXiv
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| Format: | Preprint |
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2026
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| author | Scheuck, M. B. van Boekel, R. Henning, Th. Boley, P. A. Varga, J. Matter, A. Penzlin, A. Leftley, J. H. van Haastere, L. Perraut, K. Labadie, L. Min, M. Berger, J. P. Waters, L. B. F. M. Zieba, S. Lopez, B. Lykou, F. Augereau, J. -C. Cruzalèbes, P. Danchi, W. C. Rosas, V. Gámez Hogerheijde, M. Letessier, M. Scigliuto, J. Weigelt, G. Wolf, S. MATISSE, the collaborations, GRAVITY |
| author_facet | Scheuck, M. B. van Boekel, R. Henning, Th. Boley, P. A. Varga, J. Matter, A. Penzlin, A. Leftley, J. H. van Haastere, L. Perraut, K. Labadie, L. Min, M. Berger, J. P. Waters, L. B. F. M. Zieba, S. Lopez, B. Lykou, F. Augereau, J. -C. Cruzalèbes, P. Danchi, W. C. Rosas, V. Gámez Hogerheijde, M. Letessier, M. Scigliuto, J. Weigelt, G. Wolf, S. MATISSE, the collaborations, GRAVITY |
| contents | Circumstellar discs, and especially their inner regions, covering ranges from <1 au to a few astronomical units, are the birthplaces of terrestrial planets. The inner regions are thought to be similarly diverse in structure as the well-observed outer regions probed by ALMA. Combining data and results from previous studies of 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. We model the multi-wavelength interferometric data using a parametrised, geometrically thin disc model, allowing for azimuthal asymmetry, exploring a first-order disc modulation and an off-centre Gaussian component. 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 $χ^2_\text{r}$ 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 $R_\text{rim}\approx0.1$ au. All together, we find a very complex, substantially non-point symmetric and temporally-variable disc ($r_\text{out}\lesssim6$ au) around the primary. The very close-in inner rim indicates the presence of material inside the typical wall-like sublimation radius $R_\text{rim,literature}\approx0.3$ au. The complex, temporally variable inner-disc geometry is likely affected or even caused by the close passing (~5 au) and short orbit ($P\approx24$ yr) of the companion HD 142527 B. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_03393 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The asymmetric structure of the inner disc around HD 142527 A with VLTI/MATISSE Scheuck, M. B. van Boekel, R. Henning, Th. Boley, P. A. Varga, J. Matter, A. Penzlin, A. Leftley, J. H. van Haastere, L. Perraut, K. Labadie, L. Min, M. Berger, J. P. Waters, L. B. F. M. Zieba, S. Lopez, B. Lykou, F. Augereau, J. -C. Cruzalèbes, P. Danchi, W. C. Rosas, V. Gámez Hogerheijde, M. Letessier, M. Scigliuto, J. Weigelt, G. Wolf, S. MATISSE, the collaborations, GRAVITY Earth and Planetary Astrophysics Solar and Stellar Astrophysics Circumstellar discs, and especially their inner regions, covering ranges from <1 au to a few astronomical units, are the birthplaces of terrestrial planets. The inner regions are thought to be similarly diverse in structure as the well-observed outer regions probed by ALMA. Combining data and results from previous studies of 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. We model the multi-wavelength interferometric data using a parametrised, geometrically thin disc model, allowing for azimuthal asymmetry, exploring a first-order disc modulation and an off-centre Gaussian component. 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 $χ^2_\text{r}$ 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 $R_\text{rim}\approx0.1$ au. All together, we find a very complex, substantially non-point symmetric and temporally-variable disc ($r_\text{out}\lesssim6$ au) around the primary. The very close-in inner rim indicates the presence of material inside the typical wall-like sublimation radius $R_\text{rim,literature}\approx0.3$ au. The complex, temporally variable inner-disc geometry is likely affected or even caused by the close passing (~5 au) and short orbit ($P\approx24$ yr) of the companion HD 142527 B. |
| title | The asymmetric structure of the inner disc around HD 142527 A with VLTI/MATISSE |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2602.03393 |