PDS 70 is so far the only young disk where multiple planets have been detected by direct imaging. The disk has a large cavity when seen at submillimeter and near-infrared wavelengths, which hosts two massive planets. This makes PDS 70 the ideal target to study the physical conditions in a strongly depleted inner disk shaped by two giant planets, and in particular to test whether disk winds can play a significant role in its evolution. Using X-Shooter and HARPS spectra, we detected for the first time the wind-tracing [O i] 6300 angstrom line, and confirm the low-moderate value of mass-accretion rate in the literature. The [O i] line luminosity is high with respect to the accretion luminosity when compared to a large sample of disks with cavities in nearby star-forming regions. The FWHM and blueshifted peak of the [O i] line suggest an emission in a region very close to the star, favoring a magnetically driven wind as the origin. We also detect wind emission and high variability in the He i 10830 angstrom line, which is unusual for low accretors. We discuss that, although the cavity of PDS 70 was clearly carved out by the giant planets, the substantial inner-disk wind could also have had a significant contribution to clearing the inner disk.

A Magnetically Driven Disk Wind in the Inner Disk of PDS 70 / J. Campbell-White, C. Manara, M. Benisty, A. Natta, R. Claes, A. Frasca, J. Bae, S. Facchini, A. Isella, L. Pérez, P. Pinilla, A. Sicilia-Aguilar, R. Teague. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 956:1(2023 Oct 01), pp. 25.1-25.10. [10.3847/1538-4357/acf0c0]

A Magnetically Driven Disk Wind in the Inner Disk of PDS 70

S. Facchini;
2023

Abstract

PDS 70 is so far the only young disk where multiple planets have been detected by direct imaging. The disk has a large cavity when seen at submillimeter and near-infrared wavelengths, which hosts two massive planets. This makes PDS 70 the ideal target to study the physical conditions in a strongly depleted inner disk shaped by two giant planets, and in particular to test whether disk winds can play a significant role in its evolution. Using X-Shooter and HARPS spectra, we detected for the first time the wind-tracing [O i] 6300 angstrom line, and confirm the low-moderate value of mass-accretion rate in the literature. The [O i] line luminosity is high with respect to the accretion luminosity when compared to a large sample of disks with cavities in nearby star-forming regions. The FWHM and blueshifted peak of the [O i] line suggest an emission in a region very close to the star, favoring a magnetically driven wind as the origin. We also detect wind emission and high variability in the He i 10830 angstrom line, which is unusual for low accretors. We discuss that, although the cavity of PDS 70 was clearly carved out by the giant planets, the substantial inner-disk wind could also have had a significant contribution to clearing the inner disk.
Settore FIS/05 - Astronomia e Astrofisica
   Winds ANd Disk structures near and Afar
   WANDA
   European Commission
   Horizon Europe Framework Programme
   101039452

   Establishing a global observational view of the early stages of planet formation and evolution
   PROTOPLANETS
   European Commission
   Horizon 2020 Framework Programme
   101002188
1-ott-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1011609
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