Sökning: WFRF:(Waters Michael F) > MINDS Abundant wate...
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000 | 05865naa a2200901 4500 | |
001 | oai:DiVA.org:su-226342 | |
003 | SwePub | |
008 | 240207s2023 | |||||||||||000 ||eng| | |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-2263422 URI |
024 | 7 | a https://doi.org/10.1051/0004-6361/2023470052 DOI |
040 | a (SwePub)su | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a ref2 swepub-contenttype |
072 | 7 | a art2 swepub-publicationtype |
100 | 1 | a Gasman, Danny4 aut |
245 | 1 0 | a MINDS Abundant water and varying C/O across the disk of Sz 98 as seen by JWST/MIRI |
264 | 1 | c 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 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
650 | 7 | a 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 | |
700 | 1 | a van Dishoeck, Ewine F.4 aut |
700 | 1 | a Grant, Sierra L.4 aut |
700 | 1 | a Temmink, Milou4 aut |
700 | 1 | a Tabone, Benoit4 aut |
700 | 1 | a Henning, Thomas4 aut |
700 | 1 | a Kamp, Inga4 aut |
700 | 1 | a Guedel, Manuel4 aut |
700 | 1 | a Lagage, Pierre-Olivier4 aut |
700 | 1 | a Perotti, Giulia4 aut |
700 | 1 | a Christiaens, Valentin4 aut |
700 | 1 | a Samland, Matthias4 aut |
700 | 1 | a Arabhavi, Aditya M.4 aut |
700 | 1 | a Argyriou, Ioannis4 aut |
700 | 1 | a Abergel, Alain4 aut |
700 | 1 | a Absil, Olivier4 aut |
700 | 1 | a Barrado, David4 aut |
700 | 1 | a Boccaletti, Anthony4 aut |
700 | 1 | a Bouwman, Jeroen4 aut |
700 | 1 | a Garatti, Alessio Caratti o4 aut |
700 | 1 | a Geers, Vincent4 aut |
700 | 1 | a Glauser, Adrian M.4 aut |
700 | 1 | a Guadarrama, Rodrigo4 aut |
700 | 1 | a Jang, Hyerin4 aut |
700 | 1 | a Kanwar, Jayatee4 aut |
700 | 1 | a Lahuis, Fred4 aut |
700 | 1 | a Morales-Calderon, Maria4 aut |
700 | 1 | a Mueller, Michael4 aut |
700 | 1 | a Nehme, Cyrine4 aut |
700 | 1 | a Olofsson, Göran,d 1944-u Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)4 aut0 (Swepub:su)olofsson |
700 | 1 | a Pantin, Eric4 aut |
700 | 1 | a Pawellek, Nicole4 aut |
700 | 1 | a Ray, Tom P.4 aut |
700 | 1 | a Rodgers-Lee, Donna4 aut |
700 | 1 | a Scheithauer, Silvia4 aut |
700 | 1 | a Schreiber, Juergen4 aut |
700 | 1 | a Schwarz, Kamber4 aut |
700 | 1 | a Vandenbussche, Bart4 aut |
700 | 1 | a Vlasblom, Marissa4 aut |
700 | 1 | a Waters, Rens L. B. F. M.4 aut |
700 | 1 | a Wright, Gillian4 aut |
700 | 1 | a Colina, Luis4 aut |
700 | 1 | a Greve, Thomas R.4 aut |
700 | 1 | a Östlin, Göran,d 1968-u Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)4 aut0 (Swepub:su)ostlin |
710 | 2 | a Stockholms universitetb Institutionen för astronomi4 org |
773 | 0 | t Astronomy and Astrophysicsg 679q 679x 0004-6361x 1432-0746 |
856 | 4 | u https://doi.org/10.1051/0004-6361/202347005y Fulltext |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-226342 |
856 | 4 8 | u https://doi.org/10.1051/0004-6361/202347005 |
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