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Author Feinstein, A.D.; Radica, M.; Welbanks, L.; Murray, C.A.; Ohno, K.; Coulombe, L.P.; Espinoza, N.; Bean, J.L.; Teske, J.K.; Benneke, B.; Line, M.R.; Rustamkulov, Z.; Saba, A.; Tsiaras, A.; Barstow, J.K.; Fortney, J.J.; Gao, P.T.; Knutson, H.A.; MacDonald, R.J.; Mikal-Evans, T.; Rackham, B.V.; Taylor, J.; Parmentier, V.; Batalha, N.M.; Berta-Thompson, Z.K.; Carter, A.L.; Changeat, Q.; dos Santos, L.A.; Gibson, N.P.; Goyal, J.M.; Kreidberg, L.; Lopez-Morales, M.; Lothringer, J.D.; Miguel, Y.; Molaverdikhani, K.; Moran, S.E.; Morello, G.; Mukherjee, S.; Sing, D,.K.; Stevenson, K.B.; Wakeford, H.R.; Ahrer, E.M.; Alam, M.K.; Alderson, L.; Allen, N.H.; Batalha, N.E.; Bell, T.J.; Blecic, J.; Brande, J.; Caceres, C.; Casewell, S.L.; Chubb, K.L.; Crossfield, I.J.M.; Crouzet, N.; Cubillos, P.E.; Decin, L.; Desert, J.M.; Harrington, J.; Heng, K.V.; Henning, T.; Iro, N.; Kempton, E.M.R.; Kendrew, S.; Kirk, J.; Krick, J.; Lagage, P.O.; Lendl, M.; Mancini, L.; Mansfield, M.; May, E.M.; Mayne, N.J.; Nikolov, N.K.; Palle, E.; de la Roche, D.J.M.P.D.; Piaulet, C.; Powell, D.; Redfield, S.; Rogers, L.K.; Roman, M.T.; Roy, P.A.; Nixon, M.C.; Schlawin, E.; Tan, X.Y.; Tremblin, P.; Turner, J.D.; Venot, O.; Waalkes, W.C.; Wheatley, P.J.; Zhang, X.
Title Early Release Science of the exoplanet WASP-39b with JWST NIRISS Type
Year 2023 Publication Nature Abbreviated Journal Nature
Volume Early Access Issue Pages
Keywords EXOMOL LINE LISTS; THERMAL STRUCTURE; MODEL; ABUNDANCES; ATMOSPHERE; RETRIEVAL; SCATTERING; EFFICIENT; SPECTRUM; METHANE
Abstract The Saturn-mass exoplanet WASP-39b has been the subject of extensive efforts to determine its atmospheric properties using transmission spectroscopy(1-4). However, these efforts have been hampered by modelling degeneracies between composition and cloud properties that are caused by limited data quality(5-9). Here we present the transmission spectrum of WASP-39b obtained using the Single-Object Slitless Spectroscopy (SOSS) mode of the Near Infrared Imager and Slitless Spectrograph (NIRISS) instrument on the JWST. This spectrum spans 0.6-2.8 mu m in wavelength and shows several water-absorption bands, the potassium resonance doublet and signatures of clouds. The precision and broad wavelength coverage of NIRISS/SOSS allows us to break model degeneracies between cloud properties and the atmospheric composition of WASP-39b, favouring a heavy-element enhancement ('metallicity') of about 10-30 times the solar value, a sub-solar carbon-to-oxygen (C/O) ratio and a solar-to-super-solar potassium-to-oxygen (K/O) ratio. The observations are also best explained by wavelength-dependent, non-grey clouds with inhomogeneous coverageof the planet's terminator.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0028-0836 ISBN Medium
Area Expedition Conference
Notes WOS:000951197700001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1800
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Author Sbordone, L.; Hansen, C.J.; Monaco, L.; Cristallo, S.; Bonifacio, P.; Caffau, E.; Villanova, S.; Amigo, P.
Title A wide angle view of the Sagittarius dwarf spheroidal galaxy II. A CEMP-r/s star in the Sagittarius dwarf spheroidal galaxy Type
Year 2020 Publication Astronomy & Astrophysics Abbreviated Journal Astron. Astrophys.
Volume 641 Issue Pages 9 pp
Keywords galaxies: abundances; galaxies: individual: Sgr dSph; Galaxy: abundances; stars: abundances; stars: chemically peculiar
Abstract We report on the discovery and chemical abundance analysis of the first CEMP-r/s star detected in the Sagittarius dwarf spheroidal galaxy (Sgr dSph) by means of UVES high-resolution spectra. The star, found in the outskirts of Sgr dSph, along the major axis of the main body, is a moderately metal-poor giant (T-eff=4753 K, log g=1.75, [Fe/H] = -1.55) with [C/Fe] = 1.13, placing it in the so-called “high-carbon band”, and strong s-process and r-process enrichment ([Ba/Fe] = 1.4, [Eu/Fe] = 1.01). Abundances of 29 elements from C to Dy were obtained. The chemical pattern appears to be best fitted by a scenario where an r-process pollution event pre-enriched the material out of which the star was born as secondary in a binary system whose primary evolved through the AGB phase, providing C- and s-process enrichment.
Address [Sbordone, L.] ESO European Southern Observ, Alonso Cordova 3107, Santiago, Chile, Email: lsbordon@eso.org
Corporate Author Thesis
Publisher Edp Sciences S A Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1432-0746 ISBN Medium
Area Expedition Conference
Notes WOS:000574599400004 Approved
Call Number UAI @ alexi.delcanto @ Serial 1239
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