Water in the terrestrial planet-forming zone of the PDS 70 disk

Autor(en)

G. Perotti, V. Christiaens, Th. Henning, B. Tabone, L.~B.~F.~M. Waters, I. Kamp, G. Olofsson, S.~L. Grant, D. Gasman, J. Bouwman, M. Samland, R. Franceschi, E.~F. van Dishoeck, K. Schwarz, M. Güdel, P. -O. Lagage, T.~P. Ray, B. Vandenbussche, A. Abergel, O. Absil, A.~M. Arabhavi, I. Argyriou, D. Barrado, A. Boccaletti, A. Caratti o Garatti, V. Geers, A.~M. Glauser, K. Justannont, F. Lahuis, M. Mueller, C. Nehmé, E. Pantin, S. Scheithauer, C. Waelkens, R. Guadarrama, H. Jang, J. Kanwar, M. Morales-Calderón, N. Pawellek, D. Rodgers-Lee, J. Schreiber, L. Colina, T.~R. Greve, G. Östlin, G. Wright

Abstrakt

Terrestrial and sub-Neptune planets are expected to form in the inner (less than 10 au) regions of protoplanetary disks

¹. Water plays a key role in their formation

^2–4, although it is yet unclear whether water molecules are formed in situ or transported from the outer disk

^5,6. So far Spitzer Space Telescope observations have only provided water luminosity upper limits for dust-depleted inner disks

⁷, similar to PDS 70, the first system with direct confirmation of protoplanet presence

^8,9. Here we report JWST observations of PDS 70, a benchmark target to search for water in a disk hosting a large (approximately 54 au) planet-carved gap separating an inner and outer disk

^10,11. Our findings show water in the inner disk of PDS 70. This implies that potential terrestrial planets forming therein have access to a water reservoir. The column densities of water vapour suggest in-situ formation via a reaction sequence involving O, H

₂ and/or OH, and survival through water self-shielding

⁵. This is also supported by the presence of CO

₂ emission, another molecule sensitive to ultraviolet photodissociation. Dust shielding, and replenishment of both gas and small dust from the outer disk, may also play a role in sustaining the water reservoir

¹². Our observations also reveal a strong variability of the mid-infrared spectral energy distribution, pointing to a change of inner disk geometry.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Max-Planck-Institut für Astronomie, Université de Liège, Université Paris Saclay, Radboud University, SRON Netherlands Institute for Space Research , University of Groningen, Stockholm University, Max-Planck-Institut für extraterrestrische Physik, Katholieke Universiteit Leuven, Leiden University, Eidgenössische Technische Hochschule Zürich, Dublin Institute for Advanced Studies, Centro de Astrobiología (CAB), Université de recherche Paris Sciences et Lettres, The Royal Observatory, Edinburgh, Chalmers University of Technology, Österreichische Akademie der Wissenschaften (ÖAW), Technische Universität Graz, Centro de Astrobiología (CSIC-INTA), Technical University of Denmark (DTU)

Journal

nat

Band

620

Seiten

516-520

Anzahl der Seiten

5

DOI

https://doi.org/10.1038/s41586-023-06317-9

Publikationsdatum

08-2023

Peer-reviewed

Ja

ÖFOS 2012

103004 Astrophysik

Schlagwörter

ASJC Scopus Sachgebiete

General

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/eb33a9a9-d188-4850-b133-81266eb3f225