ALMA millimetre-wavelength imaging of HD 138965: new constraints on the debris dust composition and presence of planetary companions

Article

Marshall, J.P., Hengst, S., Trejo-Cruz, A., del Burgo, C., Milli, J., Booth, M., Augereau, J.C., Choquet, E., Morales, F. Y., Thebault, P., Kemper, F., Faramaz-Gorka, V. and Bryden, G.. 2025. "ALMA millimetre-wavelength imaging of HD 138965: new constraints on the debris dust composition and presence of planetary companions." Monthly Notices of the Royal Astronomical Society. 541 (1), pp. 71-84. https://doi.org/10.1093/mnras/staf984
Article Title

ALMA millimetre-wavelength imaging of HD 138965: new constraints on the debris dust composition and presence of planetary companions

ERA Journal ID1074
Article CategoryArticle
AuthorsMarshall, J.P., Hengst, S., Trejo-Cruz, A., del Burgo, C., Milli, J., Booth, M., Augereau, J.C., Choquet, E., Morales, F. Y., Thebault, P., Kemper, F., Faramaz-Gorka, V. and Bryden, G.
Journal TitleMonthly Notices of the Royal Astronomical Society
Journal Citation541 (1), pp. 71-84
Number of Pages14
Year2025
PublisherOxford University Press
Place of PublicationUnited Kingdom
ISSN0035-8711
1365-2966
Digital Object Identifier (DOI)https://doi.org/10.1093/mnras/staf984
Web Address (URL)https://academic.oup.com/mnras/article/541/1/71/8162742
AbstractHD 138965 is a young A type star and member of the nearby young Argus association. This star is surrounded by a broad, bright debris disc with two temperature components that was spatially resolved at far-infrared wavelengths by Herschel. Here, we present Atacama Large Millimiter/Submillimeter Array (ALMA) millimetre-wavelength imaging of the cool outer belt. These reveal its radial extent to be 150 au with a width () of 49 au (), at a moderate inclination of 499. Due to the limited angular resolution, signal-to-noise and inclination we have no constraint on the disc's vertical scale height. We modelled the disc emission with both gravitational and radiation forces acting on the dust grains. As the inner belt has not been spatially resolved, we fixed its radius and width prior to modelling the outer belt. We find astronomical silicate is the best fit for the dust composition. However, we could not reject possible scenarios where there are at least 10 per cent water-ice inclusions. Combining the spatially resolved imaging by ALMA with non-detection at optical wavelengths by HST, we obtain a limit on the scattering albedo for the debris dust in the outer belt. Analysis of the outer belt's architecture in conjunction with simple stirring models places a mass limit of 2.3 0.4 on a companion interior to the belt (78 au), a factor of two improvement over constraints from high contrast imaging.
Keywordsplanet–disc interactions; circumstellarmatter; stars: individual: HD 138965; radio continuum: planetary systems
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 20205101. Astronomical sciences
Byline AffiliationsAcademia Sinica Institute of Astronomy and Astrophysics, Taiwan
School of Mathematics, Physics and Computing
National Autonomous University of Mexico, Mexico
Instituto de Astrof´ısica de Canarias (IAC), Spain
University of La Laguna, Spain
Grenoble Alpes University, France
Royal Observatory Edinburgh, United Kingdom
Aix-Marseille University, France
California Institute of Technology (Caltech), United States
Los Angeles Mission College, United States
Pierre and Marie Curie University, France
Institute of Space Sciences, Spain
Catalan Institution for Research and Advanced Studies (ICREA), Spain
Institute of Space Studies of Catalonia (IEEC), Spain
University of Arizona, United States
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