Search Publications
The Discovery and Follow-up of Four Transiting Short-period Sub-Neptunes Orbiting M Dwarfs
Lester, Kathryn V.; Ikuta, Kai; Tamura, Motohide +100 more
Sub-Neptunes with radii of 2–3 R ⊕ are intermediate in size between rocky planets and Neptune-sized planets. The orbital properties and bulk compositions of transiting sub-Neptunes provide clues to the formation and evolution of close-in small planets. In this paper, we present the discovery and follow-up of four sub-Neptunes orbiting M…
Detection of High-frequency Pulsation in WR 135: Investigation of Stellar Wind Dynamics
Mathew, Blesson; Baug, Tapas; Das, Ramkrishna +2 more
We report the detection of high-frequency pulsations in WR 135 from short-cadence (10 minute) optical photometric and spectroscopic time series surveys. The harmonics up to the sixth order are detected from the integrated photometric flux variations, while the comparatively weaker eighth harmonic is detected from the strengths of the emission line…
Clusters, Clumps, Dust, and Gas (CCDG) in NGC 1614: Benchmarking Cluster Demographics in Extreme Systems
Whitmore, Bradley C.; Chandar, Rupali; Goudfrooij, Paul +3 more
Observations of young star clusters in a variety of galaxies have been used to constrain basic properties related to star formation, such as the fraction of stars found in clusters (Γ) and the shape of the cluster mass function (CMF). However, the results can depend heavily on the reliability of the cluster age-dating process and other assumptions…
The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation
Myers, Adam D.; Bailey, Stephen; Palanque-Delabrouille, Nathalie +57 more
Over the next 5 yr, the Dark Energy Spectroscopic Instrument (DESI) will use 10 spectrographs with 5000 fibers on the 4 m Mayall Telescope at Kitt Peak National Observatory to conduct the first Stage IV dark energy galaxy survey. At z < 0.6, the DESI Bright Galaxy Survey (BGS) will produce the most detailed map of the universe during the dark-e…
Target Selection and Validation of DESI Luminous Red Galaxies
Moustakas, J.; Myers, Adam D.; Brooks, D. +46 more
The Dark Energy Spectroscopic Instrument (DESI) is carrying out a five-year survey that aims to measure the redshifts of tens of millions of galaxies and quasars, including 8 million luminous red galaxies (LRGs) in the redshift range 0.4 < z ≲ 1.0. Here we present the selection of the DESI LRG sample and assess its spectroscopic performance usi…
The Spectroscopic Data Processing Pipeline for the Dark Energy Spectroscopic Instrument
Alexander, D. M.; Moustakas, J.; Myers, Adam D. +55 more
We describe the spectroscopic data processing pipeline of the Dark Energy Spectroscopic Instrument (DESI), which is conducting a redshift survey of about 40 million galaxies and quasars using a purpose-built instrument on the 4 m Mayall Telescope at Kitt Peak National Observatory. The main goal of DESI is to measure with unprecedented precision th…
JWST PEARLS. Prime Extragalactic Areas for Reionization and Lensing Science: Project Overview and First Results
Finkelstein, Steven L.; Hathi, Nimish P.; Holwerda, Benne W. +82 more
We give an overview and describe the rationale, methods, and first results from NIRCam images of the JWST "Prime Extragalactic Areas for Reionization and Lensing Science" (PEARLS) project. PEARLS uses up to eight NIRCam filters to survey several prime extragalactic survey areas: two fields at the North Ecliptic Pole (NEP); seven gravitationally le…
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…
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…
The Target-selection Pipeline for the Dark Energy Spectroscopic Instrument
Myers, Adam D.; Bailey, Stephen; Palanque-Delabrouille, Nathalie +51 more
In 2021 May, the Dark Energy Spectroscopic Instrument (DESI) began a 5 yr survey of approximately 50 million total extragalactic and Galactic targets. The primary DESI dark-time targets are emission line galaxies, luminous red galaxies, and quasars. In bright time, DESI will focus on two surveys known as the Bright Galaxy Survey and the Milky Way …