Search Publications
Missions
Journals
Publication Years
Spectroscopic identification of rapidly rotating red giant stars in APOKASC-3 and APOGEE DR16
García, Rafael A.; Mathur, Savita; Pinsonneault, Marc H. +6 more
Rotationally enhanced red giant stars are astrophysically interesting but rare. In this paper, we present a catalogue of 3217 active red giant candidates in the APOGEE DR16 (Apache Point Observatory Galactic Evolution Experiment - Data Release 16) survey. We use a control sample in the well-studied Kepler fields to demonstrate a strong relationshi…
A 2.9 hr Periodic Radio Transient with an Optical Counterpart
Strader, Jay; Rea, N.; Chomiuk, Laura +12 more
We present a long-period radio transient (GLEAM-X J0704‑37) discovered to have an optical counterpart, consistent with a cool main-sequence star of spectral type M3. The radio periodicity occurs at the longest period yet found, 2.9 hr, and was discovered in archival low-frequency data from the Murchison Widefield Array. High time resolution observ…
Clumpy star formation and an obscured nuclear starburst in the luminous dusty z = 4 galaxy GN20 seen by MIRI/JWST
Östlin, G.; Güdel, M.; Colina, L. +28 more
Dusty star-forming galaxies emit most of their light at far-infrared to millimeter wavelengths as their star formation is highly obscured. Far-infrared and millimeter observations have revealed their dust, neutral and molecular gas properties. The sensitivity of JWST at rest-frame optical and near-infrared wavelengths now allows the study of the s…
VIA MACHINAE 2.0: Full-sky, model-agnostic search for stellar streams in Gaia DR2
Buckley, Matthew R.; Shih, David; Necib, Lina
We present an update to VIA MACHINAE, an automated stellar stream-finding algorithm based on the deep learning anomaly detector ANODE. VIA MACHINAE identifies stellar streams within Gaia, using only angular positions, proper motions, and photometry, without reference to a model of the Milky Way potential for orbit integration or stellar distances.…
The morphological mix of dwarf galaxies in the nearby Universe
Kaviraj, S.; Watkins, A. E.; Lazar, I. +3 more
We use a complete, unbiased sample of 257 dwarf (10$^{8}\, {\rm M}_{\odot } \lt M_{\rm {\star }} \lt 10^{9.5}\, {\rm M}_{\odot }$) galaxies at z < 0.08, in the COSMOS field, to study the morphological mix of the dwarf population in low-density environments. Visual inspection of extremely deep optical images and their unsharp-masked counterparts…
The Heavy Metal Survey: Star Formation Constraints and Dynamical Masses of 21 Massive Quiescent Galaxies at z = 1.3–2.3
Barro, Guillermo; Franx, Marijn; van Dokkum, Pieter +14 more
In this paper, we present the Heavy Metal Survey, which obtained ultradeep medium-resolution spectra of 21 massive quiescent galaxies at 1.3 < z < 2.3 with Keck/LRIS and MOSFIRE. With integration times of up to 16 hr per band per galaxy, we observe numerous Balmer and metal absorption lines in atmospheric windows. We successfully derive spec…
Abundances of iron-peak elements in accreted and in situ born Galactic halo stars
Skúladóttir, Á.; Amarsi, A. M.; Nissen, P. E. +1 more
Context. Studies of the element abundances and kinematics of stars belonging to the Galactic halo have revealed the existence of two distinct populations: accreted stars with a low [α/Fe] ratio and in situ born stars with a higher ratio.
Aims: Previous work on the abundances of C, O, Na, Mg, Si, Ca, Ti, Cr, Mn, Fe, Ni, Cu, and Zn in high-α an…
Possible Carbon Dioxide above the Thick Aerosols of GJ 1214 b
Fortney, Jonathan J.; Wheatley, Peter J.; Henry, Gregory W. +14 more
Sub-Neptune planets with radii smaller than Neptune (3.9 R ⊕) are the most common type of planet known to exist in the Milky Way, even though they are absent in the solar system. These planets can potentially have a large diversity of compositions as a result of different mixtures of rocky material, icy material, and gas accreted from a…
Extended Stellar Populations in Ultrafaint Dwarf Galaxies
Vivas, A. Katherina; Martínez-Vázquez, Clara E.; Tau, Elisa A.
The possible existence of stellar halos in low-mass galaxies is being intensely discussed nowadays after some recent discoveries of stars located in the outskirts of dwarf galaxies of the Local Group. RR Lyrae stars can be used to identify the extent of these structures, taking advantage of the minimization of foreground contamination they provide…
Characterizing the Average Interstellar Medium Conditions of Galaxies at z ∼ 5.6–9 with Ultraviolet and Optical Nebular Lines
Papovich, Casey; Cole, Justin W.; Finkelstein, Steven L. +30 more
Ultraviolet (UV; rest-frame ∼1200–2000 Å) spectra provide a wealth of diagnostics to characterize fundamental galaxy properties, such as their chemical enrichment, the nature of their stellar populations, and their amount of Lyman-continuum (LyC) radiation. In this work, we leverage publicly released JWST data to construct the rest-frame UV-to-opt…