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A Galactic Eclipse: The Small Magellanic Cloud Is Forming Stars in Two Superimposed Systems
Murray, Claire E.; Choi, Yumi; Lee, Min-Young +22 more
The structure and dynamics of the star-forming disk of the Small Magellanic Cloud (SMC) have long confounded us. The SMC is widely used as a prototype for galactic physics at low metallicity, and yet we fundamentally lack an understanding of the structure of its interstellar medium (ISM). In this work, we present a new model for the SMC by compari…
Are These Planets or Brown Dwarfs? Broadly Solar Compositions from High-resolution Atmospheric Retrievals of ∼10–30 M Jup Companions
Zhang, Yapeng; Fitzgerald, Michael P.; López, Ronald A. +32 more
Using Keck Planet Imager and Characterizer high-resolution (R ∼ 35,000) spectroscopy from 2.29 to 2.49 µm, we present uniform atmospheric retrievals for eight young substellar companions with masses of ∼10–30 M Jup, orbital separations spanning ∼50–360 au, and T eff between ∼1500 and 2600 K. We find that all companions …
The hierarchical formation of 30 Doradus as seen by JWST
Fahrion, Katja; De Marchi, Guido
The 30 Doradus region in the Large Magellanic Cloud (LMC) is the most energetic star-forming region in the Local Group. It is powered by the feedback from the massive stars in R 136, the 1-2 Myr old central massive cluster. 30 Doradus has therefore long been regarded as a laboratory for studying star and star cluster formation under conditions rem…
Evolution of the star formation rate and ΣSFR of galaxies at cosmic morning (4 < z < 10)
Kartaltepe, J. S.; Franco, M.; Dickinson, M. +28 more
The galaxy-integrated star formation rate (SFR) surface density measurement (ΣSFR) has been proposed as a valuable diagnostic of the mass accumulation in galaxies given it is more tightly related to the physics of star formation and stellar feedback than other indicators. In this work, we assembled a statistical sample of 230 galaxies o…
Astrophysical constraints on decaying dark gravitons
Obied, Georges; Law-Smith, Jamie A. P.; Prabhu, Anirudh +1 more
In the dark dimension scenario, which predicts an extra dimension of micron scale, dark gravitons (KK modes) are a natural dark matter candidate. In this paper, we study observable features of this model. In particular, their decay to standard matter fields can distort the CMB and impact other astrophysical signals. Using this we place bounds on t…
A benchmark JWST near-infrared spectrum for the exoplanet WASP-39 b
Zhang, X.; Heng, K.; May, E. M. +77 more
Observing exoplanets through transmission spectroscopy supplies detailed information about their atmospheric composition, physics and chemistry. Before the James Webb Space Telescope (JWST), these observations were limited to a narrow wavelength range across the near-ultraviolet to near-infrared, alongside broadband photometry at longer wavelength…
The One-hundred-deg2 DECam Imaging in Narrowbands (ODIN): Survey Design and Science Goals
Dey, Arjun; Gronwall, Caryl; Jeong, Woong-Seob +40 more
We describe the survey design and science goals for One-hundred-deg2 DECam Imaging in Narrowbands (ODIN), a NOIRLab survey using the Dark Energy Camera (DECam) to obtain deep (AB ∼ 25.7) narrowband images over an unprecedented area of sky. The three custom-built narrowband filters, N419, N501, and N673, have central wavelengths of 419, …
Asteroseismic modelling of fast rotators and its opportunities for astrophysics
Aerts, Conny; Tkachenko, Andrew
Rotation matters for the life of a star. It causes a multitude of dynamical phenomena in the stellar interior during a star's evolution, and its effects accumulate until the star dies. All stars rotate at some level, but most of those born with a mass higher than 1.3 times the mass of the Sun rotate rapidly during more than 90% of their nuclear li…
The structure of massive star-forming galaxies from JWST and ALMA: Dusty, high-redshift disc galaxies
Smail, Ian; Brammer, Gabe; Swinbank, A. M. +15 more
We present an analysis of the JWST NIRCam and MIRI morphological and structural properties of 80 massive (log10(M*[M⊙]) = 11.2 ± 0.1) dusty star-forming galaxies at z = 2.7‑0.7+1.2, identified as sub-millimetre galaxies (SMGs) by ALMA, which have been observed as part of the JWST PRIMER projec…
Two Distinct Classes of Quiescent Galaxies at Cosmic Noon Revealed by JWST PRIMER and UNCOVER
Dickinson, Mark; Giavalisco, Mauro; Grogin, Norman A. +31 more
We present a measurement of the low-mass quiescent size–mass relation at cosmic noon (1 < z < 3) from the JWST PRIMER and UNCOVER treasury surveys, which highlights two distinct classes of quiescent galaxies. While the massive population is well studied at these redshifts, the low-mass end has been previously underexplored due to a lack of o…