A magnetically driven disc wind in the inner disc of PDS 70

Justyn Campbell-White (Lead / Corresponding author), Carlo F. Manara, Myriam Benisty, Antonella Natta, Rik A. B. Claes, Antonio Frasca, Jaehan Bae, Stefano Facchini, Andrea Isella, Laura Perez, Paola Pinilla, Aurora Sicilia Aguilar, Richard Teague

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Abstract

PDS 70 is so far the only young disc where multiple planets have been detected by direct imaging. The disc has a large cavity when seen at sub-mm and NIR wavelengths, which hosts two massive planets. This makes PDS 70 the ideal target to study the physical conditions in a strongly depleted inner disc shaped by two giant planets, and in particular to test whether disc 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 Å 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 discs with cavities in nearby star-forming regions. The FWHM and blue-shifted peak of the [O I] line suggest an emission in a region very close to the star, favouring a magnetically driven wind as the origin. We also detect wind emission and high variability in the He Ι 10830 Å 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 disc wind could also have had a significant contribution to clearing the inner-disc.
Original languageEnglish
Number of pages10
JournalAstrophysical Journal
Volume956
Publication statusPublished - 4 Oct 2023

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  • A magnetically driven disc wind in the inner disc of PDS 70

    Campbell-White, J., Manara, C. F., Benisty, M., Natta, A., Claes, R. A. B., Frasca, A., Bae, J., Facchini, S., Isella, A., Perez, L., Pinilla, P., Sicilia Aguilar, A. & Teague, R., 18 Aug 2023, arXiv, 13 p.

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