Resolving the large exoKuiper belt of the HD 126062 debris disc and extended gas emission in its vicinity
Rattachement africain : cl, us, nz, gb, ru. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Context . Intermediate mass stars (1–3 M ⊙ ) host some of the brightest and most well-studied debris discs. This stellar class is also the most frequent host of molecular gas in systems with ages beyond typical protoplanetary disc lifetimes and the most likely to host detected giant planets in radial velocity surveys. The debris discs of intermediate mass stars have therefore become a fertile ground for studying disc-planet interactions. Aims . In this work, we present the first ALMA observations towards the A-type star HD 126062, located in Upper Centaurus Lupus/Lower Centaurus Crux, with the aim of characterising the properties of its debris disc. Methods . We probed the thermal continuum emission using observations at 1.3 mm, which were analysed through image reconstruction while employing different visibility weighting regimes in addition to parametric model fitting to the observed visibilities. The observational setup also covers the frequency of the 12 CO molecular line, allowing for imaging of gas in the vicinity of the system. Results . We detected the dust continuum emission from an exoKuiper belt around HD 126062. Modelled as a Gaussian ring, the visibilities are consistent with a radial separation of R=2.01 −0.05 +0.04′′ , which is equivalent to ≈270 −4 +5 au, and a full width half maximum of ΔR=0.71″ ± 0.09, or 95 ± 12 au. The continuum emission appears in an almost face-on configuration with an inclination to the line of sight constrained to be ≤17°. 12 CO(2–1) emission is detected in the vicinity of the debris disc, with the majority of the emission found external to the exoKuiper belt. Conclusions . The exoKuiper belt characterised here is one of the largest to be detected, and it is consistent with the previous predictions of the distribution of dust in the system based on spectral energy distribution fitting. The morphology and displacement in velocity with respect to the systemic velocity suggest that the gas is not associated with the star and debris disc, and it most likely originates from a diffuse gas cloud in the nearby galaxy.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Resolving the large exoKuiper belt of the HD 126062 debris disc and extended gas emission in its vicinity
- Date Crossref
- 01/11/2025
- Éditeur
- EDP Sciences
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Universidad de Santiago de Chile pays non établi dans la noticeUniversité ou école supérieure
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Atacama Large Millimeter Submillimeter Array pays non établi dans la noticeStructure de recherche
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Millennium Engineering and Integration (United States) pays non établi dans la noticeEntreprise
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University of Chile pays non établi dans la noticeUniversité ou école supérieure
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Malaghan Institute of Medical Research pays non établi dans la noticeÉtablissement de santé
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University of Cambridge Institute of Astronomy pays non établi dans la noticeUniversité ou école supérieure
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Institute of Astronomy pays non établi dans la noticeStructure de recherche
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Pennsylvania State University Center for Exoplanets and Habitable Worlds pays non établi dans la noticeUniversité ou école supérieure
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Queen Mary University of London pays non établi dans la noticeUniversité ou école supérieure
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Universidad Diego Portales pays non établi dans la noticeUniversité ou école supérieure
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Center for Interdisciplinary Research in Astrophysics and Space Exploration (CIRAS) pays non établi dans la noticeInstitution
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Departamento de Física pays non établi dans la noticeInstitution
Universidad de Santiago de Chile, Atacama Large Millimeter Submillimeter Array et Millennium Engineering and Integration (United States), avec 9 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.