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Sökning: onr:"swepub:oai:DiVA.org:su-226342" > MINDS Abundant wate...

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FältnamnIndikatorerMetadata
00005865naa a2200901 4500
001oai:DiVA.org:su-226342
003SwePub
008240207s2023 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-2263422 URI
0247 a https://doi.org/10.1051/0004-6361/2023470052 DOI
040 a (SwePub)su
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Gasman, Danny4 aut
2451 0a MINDS Abundant water and varying C/O across the disk of Sz 98 as seen by JWST/MIRI
264 1c 2023
338 a print2 rdacarrier
520 a Context. The Mid-InfraRed Instrument (MIRI) Medium Resolution Spectrometer (MRS) on board the James Webb Space Telescope (JWST) allows us to probe the inner regions of protoplanetary disks, where the elevated temperatures result in an active chemistry and where the gas composition may dictate the composition of planets forming in this region. The disk around the classical T Tauri star Sz 98, which has an unusually large dust disk in the millimetre with a compact core, was observed with the MRS, and we examine its spectrum here.Aims. We aim to explain the observations and put the disk of Sz 98 in context with other disks, with a focus on the H2O emission through both its ro-vibrational and pure rotational emission. Furthermore, we compare our chemical findings with those obtained for the outer disk from Atacama Large Millimeter/submillimeter Array (ALMA) observations.Methods. In order to model the molecular features in the spectrum, the continuum was subtracted and local thermodynamic equilibrium (LTE) slab models were fitted. The spectrum was divided into different wavelength regions corresponding to H2O lines of different excitation conditions, and the slab model fits were performed individually per region.Results. We confidently detect CO, H2O, OH, CO2, and HCN in the emitting layers. Despite the plethora of H2O lines, the isotopo-logue (H2O)-O-18 is not detected. Additionally, no other organics, including C2H2, are detected. This indicates that the C/O ratio could be substantially below unity, in contrast with the outer disk. The H2O emission traces a large radial disk surface region, as evidenced by the gradually changing excitation temperatures and emitting radii. Additionally, the OH and CO2 emission is relatively weak. It is likely that H2O is not significantly photodissociated, either due to self-shielding against the stellar irradiation, or UV shielding from small dust particles. While H2O is prominent and OH is relatively weak, the line fluxes in the inner disk of Sz 98 are not outliers compared to other disks.Conclusions. The relative emitting strength of the different identified molecular features points towards UV shielding of H2O in the inner disk of Sz 98, with a thin layer of OH on top. The majority of the organic molecules are either hidden below the dust continuum, or not present. In general, the inferred composition points to a sub-solar C/O ratio (<0.5) in the inner disk, in contrast with the larger than unity C/O ratio in the gas in the outer disk found with ALMA.
650 7a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng
653 a protoplanetary disks
653 a stars
653 a variables
653 a T Tauri
653 a Herbig Ae/Be
653 a infrared
653 a general
653 a astrochemistry
7001 a van Dishoeck, Ewine F.4 aut
7001 a Grant, Sierra L.4 aut
7001 a Temmink, Milou4 aut
7001 a Tabone, Benoit4 aut
7001 a Henning, Thomas4 aut
7001 a Kamp, Inga4 aut
7001 a Guedel, Manuel4 aut
7001 a Lagage, Pierre-Olivier4 aut
7001 a Perotti, Giulia4 aut
7001 a Christiaens, Valentin4 aut
7001 a Samland, Matthias4 aut
7001 a Arabhavi, Aditya M.4 aut
7001 a Argyriou, Ioannis4 aut
7001 a Abergel, Alain4 aut
7001 a Absil, Olivier4 aut
7001 a Barrado, David4 aut
7001 a Boccaletti, Anthony4 aut
7001 a Bouwman, Jeroen4 aut
7001 a Garatti, Alessio Caratti o4 aut
7001 a Geers, Vincent4 aut
7001 a Glauser, Adrian M.4 aut
7001 a Guadarrama, Rodrigo4 aut
7001 a Jang, Hyerin4 aut
7001 a Kanwar, Jayatee4 aut
7001 a Lahuis, Fred4 aut
7001 a Morales-Calderon, Maria4 aut
7001 a Mueller, Michael4 aut
7001 a Nehme, Cyrine4 aut
7001 a Olofsson, Göran,d 1944-u Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)4 aut0 (Swepub:su)olofsson
7001 a Pantin, Eric4 aut
7001 a Pawellek, Nicole4 aut
7001 a Ray, Tom P.4 aut
7001 a Rodgers-Lee, Donna4 aut
7001 a Scheithauer, Silvia4 aut
7001 a Schreiber, Juergen4 aut
7001 a Schwarz, Kamber4 aut
7001 a Vandenbussche, Bart4 aut
7001 a Vlasblom, Marissa4 aut
7001 a Waters, Rens L. B. F. M.4 aut
7001 a Wright, Gillian4 aut
7001 a Colina, Luis4 aut
7001 a Greve, Thomas R.4 aut
7001 a Östlin, Göran,d 1968-u Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)4 aut0 (Swepub:su)ostlin
7102 a Stockholms universitetb Institutionen för astronomi4 org
7730 t Astronomy and Astrophysicsg 679q 679x 0004-6361x 1432-0746
8564 u https://doi.org/10.1051/0004-6361/202347005y Fulltext
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-226342
8564 8u https://doi.org/10.1051/0004-6361/202347005

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