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Tomographic line analysis identifies possible embedded planets in disks

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A orange-glowing protoplanetary disk with a spiral structure and two dark cavities or gaps visible in the center against a black background, captured through astronomical observation.
Research area:AstrophysicsAstronomy and AstrophysicsAstro and Planetary Science

What the study found

The study found that tomographic analysis of molecular lines can reveal signatures of embedded planets in protoplanetary disks, not just deviations from Keplerian motion but also localized line broadening. The authors also report that a line-skewness diagnostic may help separate planet-driven signatures from those caused by disk instabilities.

Why the authors say this matters

The authors say this matters because it extends the analysis of disk substructures beyond line-centroid kinematics alone. They suggest this approach can help investigate the origin of substructures seen in dust and molecular line emission.

What the researchers tested

The researchers used synthetic observations of planet-disk interactions and disk instabilities to test a tomographic study of molecular lines. They also applied the analysis to exoALMA CO line data from the disks of HD 135344B and MWC 758.

What worked and what didn't

With only a few hours of ALMA integration at moderate angular resolution, the study indicates it is possible to identify signatures driven by planets more massive than 0.1% of the stellar mass. The authors report that these signatures can constrain a planet's orbital radius and azimuthal location. For HD 135344B, the analysis identified strongly localized velocity and line-width perturbations, suggesting three massive planets may be present; for MWC 758, the observed dominance of vertical-velocity spirals was consistent with moderate disk eccentricities or warps, possibly induced by a substellar companion in the inner regions.

What to keep in mind

The abstract does not describe detailed uncertainties, sample sizes, or formal limitations beyond the observational setup and the use of synthetic observations. The interpretation of the HD 135344B and MWC 758 results is presented as suggestive or consistent with models, rather than as a definitive detection.

Key points

  • Tomographic molecular-line analysis can reveal planet-related signatures in protoplanetary disks.
  • The study says both line broadening and deviations from Keplerian motion are useful signals.
  • A line-skewness diagnostic may help distinguish planets from disk instabilities.
  • The authors report detectability with a few hours of ALMA integration at moderate angular resolution.
  • HD 135344B showed localized velocity and line-width perturbations consistent with possible embedded planets.
  • MWC 758 showed signatures consistent with moderate disk eccentricities or warps.

Disclosure

Research title:
Tomographic line analysis identifies possible embedded planets in disks
Authors:
Andrés F. Izquierdo, J. Bae, Stefano Facchini, Ewine F. van Dishoeck, Marcelo Barraza-Alfaro, Myriam Benisty, Richard Teague, Jochen Stadler, Sean M. Andrews, Gianni Cataldi, Nicolás Cuello, Pietro Curone, Ian Czekala, Daniele Fasano, Mario Flock, Misato Fukagawa, Maria Galloway-Sprietsma, Cassandra Hall, Jane Huang, John D. Ilee, Andrea Isella, Jensen Lawrence, Geoffroy Lesur, Giuseppe Lodato, Cristiano Longarini, Ryan A. Loomis, François Ménard, C. Pinte, Daniel J. Price, Giovanni Rosotti, Leonardo Testi, David J. Wilner, Andrew J. Winter, Lisa Wölfer, Brianna Zawadzki
Institutions:
Center for Astrophysics Harvard & Smithsonian, Center for Astrophysics Harvard & Smithsonian, Centre National de la Recherche Scientifique, Centre National de la Recherche Scientifique, Centre National de la Recherche Scientifique, Centre National de la Recherche Scientifique, Centre National de la Recherche Scientifique, Centre National de la Recherche Scientifique, Columbia University, European Southern Observatory, Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Leiden University, Leiden University, Massachusetts Institute of Technology, Massachusetts Institute of Technology, Massachusetts Institute of Technology, Massachusetts Institute of Technology, Max Planck Institute for Astronomy, Max Planck Institute for Astronomy, Max Planck Institute for Extraterrestrial Physics, Monash University, Monash University, National Astronomical Observatory of Japan, National Astronomical Observatory of Japan, National Radio Astronomy Observatory, Observatoire de la Côte d’Azur, Observatoire de la Côte d’Azur, Osservatorio astronomico di Bologna, Queen Mary University of London, Rice University, Université Côte d'Azur, Université Côte d'Azur, Université Grenoble Alpes, Université Grenoble Alpes, Université Grenoble Alpes, Université Grenoble Alpes, University of Bologna, University of Cambridge, University of Chile, University of Florida, University of Florida, University of Florida, University of Georgia, University of Leeds, University of Milan, University of Milan, University of Milan, University of St Andrews, Wesleyan University
Publication date:
2026-03-16
DOI:
10.3847/2041-8213/ae48fd
OpenAlex record:
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AI provenance: This post was generated by gpt-5.4-mini (OpenAI). The original authors did not write or review this post.