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CO or no CO? Narrowing the CO abundance constraint and recovering the H2O detection in the atmosphere of WASP-127 b using SPIRou
Vinatier, Sandrine; Gaidos, Eric; Cowan, Nicolas B. +24 more
Precise measurements of chemical abundances in planetary atmospheres are necessary to constrain the formation histories of exoplanets. A recent study of WASP-127 b, a close-in puffy sub-Saturn orbiting its solar-type host star in 4.2 d, using Hubble Space Telescope (HST) and Spitzer revealed a feature-rich transmission spectrum with strong excess …
Gaia Data Release 3. Validating the classification of variable young stellar object candidates
Gavras, Panagiotis; Ábrahám, Péter; Kóspál, Ágnes +14 more
Context. The Gaia third Data Release (DR3) presents the first catalogue of full-sky variable young stellar object (YSO) candidates observed by the Gaia space telescope during the initial 34 months of science operations.
Aims: Numerous types of variable stars were classified using photometric data collected by Gaia. One of the new classes pres…
JWST CEERS probes the role of stellar mass and morphology in obscuring galaxies
Papovich, Casey; Finkelstein, Steven L.; Buat, Véronique +38 more
In recent years, observations have uncovered a population of massive galaxies that are invisible or very faint in deep optical/near-infrared (near-IR) surveys but brighter at longer wavelengths. However, the nature of these optically dark or faint galaxies (OFGs; one of several names given to these objects) is highly uncertain. In this work, we in…
Distant Echoes of the Milky Way's Last Major Merger
Conroy, Charlie; Ting, Yuan-Sen; Cargile, Phillip A. +9 more
The majority of the Milky Way's stellar halo consists of debris from our galaxy's last major merger, the Gaia-Sausage-Enceladus (GSE). In the past few years, stars from the GSE have been kinematically and chemically studied in the inner 30 kpc of our galaxy. However, simulations predict that accreted debris could lie at greater distances, forming …
JWST's PEARLS: A JWST/NIRCam View of ALMA Sources
Grogin, Norman A.; Hathi, Nimish P.; Holwerda, Benne W. +33 more
We report the results of James Webb Space Telescope/NIRCam observations of 19 (sub)millimeter sources detected by the Atacama Large Millimeter Array (ALMA). The accurate ALMA positions allowed unambiguous identifications of their NIRCam counterparts. Taking gravitational lensing into account, these represent 16 distinct galaxies in three fields an…
Massive dark matter haloes at high redshift: implications for observations in the JWST era
Wang, Kai; Chen, Yangyao; Mo, H. J.
The presence of massive galaxies at high z as recently observed by JWST appears to contradict the current ΛCDM cosmology. Here, we aim to alleviate this tension by incorporating uncertainties from three sources in counting galaxies: cosmic variance, error in stellar mass estimation, and backsplash enhancement. Each of these factors significantly i…
Spectroscopic Time Series Performance of the Mid-infrared Instrument on the JWST
Espinoza, Néstor; Bell, Taylor J.; Bouwman, Jeroen +21 more
We present here the first ever mid-infrared spectroscopic time series observation of the transiting exoplanet L 168-9 b with the Mid-Infrared Instrument (MIRI) on the James Webb Space Telescope. The data were obtained as part of the MIRI commissioning activities, to characterize the performance of the Low Resolution Spectroscopy (LRS) mode for the…
A JWST NIRSpec Phase Curve for WASP-121b: Dayside Emission Strongest Eastward of the Substellar Point and Nightside Conditions Conducive to Cloud Formation
Mikal-Evans, Thomas; Sing, David K.; Lothringer, Joshua D. +10 more
We present the first exoplanet phase-curve measurement made with the JWST NIRSpec instrument, highlighting the exceptional stability of this newly commissioned observatory for exoplanet climate studies. The target, WASP-121b, is an ultrahot Jupiter with an orbital period of 30.6 hr. We analyze two broadband light curves generated for the NRS1 and …
Dynamically constraining the length of the Milky way bar
Price-Whelan, Adrian M.; Hawkins, Keith; Lucey, Madeline +5 more
We present a novel method for constraining the length of the Galactic bar using 6D phase-space information to directly integrate orbits. We define a pseudo-length for the Galactic bar, named RFreq, based on the maximal extent of trapped bar orbits. We find the RFreq measured from orbits is consistent with the RFreq…
Signs of environmental effects on star-forming galaxies in the Spiderweb protocluster at z = 2.16
Tanaka, I.; Dannerbauer, H.; Daikuhara, K. +11 more
We use multi-object near-infrared spectroscopy with VLT/KMOS to investigate the role of the environment in the evolution of the ionized gas properties of narrow-band-selected H α emitters (HAEs) in the Spiderweb protocluster at z = 2.16. Based on rest-frame optical emission lines, H α and [N II]λ6584, we confirm the cluster membership of 39 of our…