Issue |
A&A
Volume 691, November 2024
|
|
---|---|---|
Article Number | A169 | |
Number of page(s) | 10 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361/202452120 | |
Published online | 08 November 2024 |
Spatially correlated stellar accretion in the Lupus star-forming region
Evidence for ongoing infall from the interstellar medium
1
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange,
06300
Nice,
France
2
Max-Planck Institute for Astronomy (MPIA),
Königstuhl 17,
69117
Heidelberg,
Germany
3
European Southern Observatory,
Karl-Schwarzschild-Str. 2,
85748
Garching bei München,
Germany
★ Corresponding author; andrew.winter@oca.eu
Received:
5
September
2024
Accepted:
24
September
2024
Context. Growing evidence suggests that protoplanetary discs may be influenced by late stage infall from the interstellar medium (ISM). It remains unclear the degree to which infall shapes disc populations at ages ≳1 Myr.
Aims. We explored possible spatial correlations between stellar accretion rates in the Lupus star-forming region, which would support the hypothesis that infall can regulate stellar accretion.
Methods. We considered both the ‘clustered’ stars towards the centre of Lupus 3, and the ‘distributed’ stars that are more sparsely distributed across the Lupus complex. We took the observed accretion rates in the literature and explore spatial correlations. In particular, we tested whether the clustered stars exhibit a radial gradient in normalised accretion rates, and whether the distributed stars have spatially correlated accretion rates.
Results. We found statistically significant correlations for both the clustered and distributed samples. The clustered sample exhibits higher accretion rates in the central region, consistent with the expected Bondi-Hoyle-Lyttleton accretion rate. Stars that are spatially closer among the distributed population also exhibit more similar accretion rates. These results cannot be explained by the stellar mass distribution for either sample. Age gradients are disfavoured, though not discounted, because normalised disc dust masses are not spatially correlated across the region.
Conclusions. Spatially correlated stellar accretion rates within the Lupus star-forming region argue in favour of an environmental influence on stellar accretion, possibly combined with internal processes in the inner disc. Refined age measurements and searches for evidence of infalling material are potential ways to further test this finding.
Key words: accretion, accretion disks / turbulence / planets and satellites: formation / protoplanetary disks / ISM: clouds
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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