Search Publications
Early Release Science of the exoplanet WASP-39b with JWST NIRCam
Fortney, Jonathan J.; Carter, Aarynn L.; Gibson, Neale P. +96 more
Measuring the metallicity and carbon-to-oxygen (C/O) ratio in exoplanet atmospheres is a fundamental step towards constraining the dominant chemical processes at work and, if in equilibrium, revealing planet formation histories. Transmission spectroscopy (for example, refs. 1,2) provides the necessary means by constraining the abundance…
Gaia Data Release 3. Summary of the variability processing and analysis
Mazeh, T.; Zucker, S.; Szabados, L. +58 more
Context. Gaia has been in operations since 2014, and two full data releases (DR) have been delivered so far: DR1 in 2016 and DR2 in 2018. The third Gaia data release expands from the early data release (EDR3) in 2020, which contained the five-parameter astrometric solution and mean photometry for 1.8 billion sources by providing 34 months of multi…
The Robotic Multiobject Focal Plane System of the Dark Energy Spectroscopic Instrument (DESI)
Miquel, Ramon; Sanchez, Eusebio; Serrano, Santiago +98 more
A system of 5020 robotic fiber positioners was installed in 2019 on the Mayall Telescope, at Kitt Peak National Observatory. The robots automatically retarget their optical fibers every 10-20 minutes, each to a precision of several microns, with a reconfiguration time of fewer than 2 minutes. Over the next 5 yr, they will enable the newly construc…
First Batch of z ≈ 11-20 Candidate Objects Revealed by the James Webb Space Telescope Early Release Observations on SMACS 0723-73
Yan, Haojing; Cheng, Cheng; Ling, Chenxiaoji +2 more
On 2022 July 13, NASA released to the whole world the data obtained by the James Webb Space Telescope (JWST) Early Release Observations (ERO). These are the first set of science-grade data from this long-awaited facility, marking the beginning of a new era in astronomy. In the study of the early universe, JWST will allow us to push far beyond z ≈ …
Target Selection and Validation of DESI Emission Line Galaxies
Moustakas, J.; Myers, Adam D.; Yèche, Christophe +49 more
The Dark Energy Spectroscopic Instrument (DESI) will precisely constrain cosmic expansion and the growth of structure by collecting ~40 million extragalactic redshifts across ~80% of cosmic history and one-third of the sky. The Emission Line galaxy (ELG) sample, which will comprise about one-third of all DESI tracers, will be used to probe the uni…
Magnetic Fields in Star Formation: from Clouds to Cores
Ntormousi, E.; Pattle, K.; Liu, T. +2 more
In this chapter we review recent advances in understanding the roles that magnetic fields play throughout the star formation process, gained through observations and simulations of molecular clouds, the dense, star-forming phase of the magnetized, turbulent interstellar medium (ISM). Recent results broadly support a picture in which the magnetic f…
Gaia Data Release 3. Astrometric binary star processing
Arenou, Frédéric; Halbwachs, Jean-Louis; Teyssier, David +6 more
Context. The Gaia Early Data Release 3 contained the positions, parallaxes, and proper motions of 1.5 billion sources, some of which did not show a good fit to the `single star' model. Binarity is one of the causes of this.
Aims: Four million of these stars were selected and various models were tested to detect binary stars and to derive thei…
CEERS Key Paper. III. The Diversity of Galaxy Structure and Morphology at z = 3-9 with JWST
Papovich, Casey; Yang, Guang; Finkelstein, Steven L. +59 more
We present a comprehensive analysis of the evolution of the morphological and structural properties of a large sample of galaxies at z = 3-9 using early James Webb Space Telescope (JWST) CEERS NIRCam observations. Our sample consists of 850 galaxies at z > 3 detected in both Hubble Space Telescope (HST)/WFC3 and CEERS JWST/NIRCam images, enabli…
Gaia Data Release 3. Mapping the asymmetric disc of the Milky Way
Prusti, T.; Mazeh, T.; Zucker, S. +445 more
Context. With the most recent Gaia data release, the number of sources with complete 6D phase space information (position and velocity) has increased to well over 33 million stars, while stellar astrophysical parameters are provided for more than 470 million sources, and more than 11 million variable stars are identified.
Aims: Using the astr…
Overview of the DESI Milky Way Survey
Miquel, Ramon; Myers, Adam D.; Bailey, Stephen +62 more
We describe the Milky Way Survey (MWS) that will be undertaken with the Dark Energy Spectroscopic Instrument (DESI) on the Mayall 4 m telescope at the Kitt Peak National Observatory. Over the next 5 yr DESI MWS will observe approximately seven million stars at Galactic latitudes |b| > 20°, with an inclusive target selection scheme focused on th…