Search Publications
An optically dark merging system at z ∼ 6 detected by JWST
Rodighiero, G.; Vulcani, B.; Castellano, M. +16 more
Context. Near- to mid-infrared observations (from Spitzer and JWST) have revealed a hidden population of galaxies at redshift z = 3 ‑ 6 called optically dark objects, which are believed to be massive and dusty star-formers. They contribute substantially to the cosmic star-formation rate (SFR) density at z ∼ 4 ‑ 5 (up to 30 ‑ 40%). Aims. While opti…
Chemical abundances for a sample of FGK dwarfs in the Pleiades open cluster from APOGEE
Wanderley, Fábio; Cunha, Katia; Souto, Diogo +8 more
This paper presents chemical abundances of 12 elements (C, Na, Mg, Al, Si, K, Ca, Ti, V, Cr, Mn, and Fe) for 80 FGK dwarfs in the Pleiades open cluster, which span a temperature range of
JWST-TST DREAMS: Nonuniform Dayside Emission for WASP-17b from MIRI/LRS
Stevenson, Kevin B.; MacDonald, Ryan J.; Valenti, Jeff A. +23 more
We present the first spectroscopic characterization of the dayside atmosphere of WASP-17b in the mid-infrared using a single JWST MIRI/LRS eclipse observation. From forward-model fits to the 5–12 µm emission spectrum, we tightly constrain the heat redistribution factor of WASP-17b to be 0.92 ± 0.02 at the pressures probed by this data, indic…
A Study of Nine Extremely Low Mass Ratio-contact Binary Systems
Ferreira Lopes, C. E.; Catelan, Márcio; Lalounta, Eleni +2 more
Low-mass ratio systems (LMR) are a very interesting class of contact eclipsing binaries challenging the theoretical models of stability. These systems are also considered possible progenitors of the rare low-mass optical transients called red novae. In this study, we present the identification of 7 new totally eclipsing LMR systems from Catalina S…
"Beads-on-a-string" Star Formation Tied to One of the Most Powerful Active Galactic Nucleus Outbursts Observed in a Cool-core Galaxy Cluster
Baum, Stefi A.; O'Dea, Christopher P.; Vaddi, Sravani +19 more
With two central galaxies engaged in a major merger and a remarkable chain of 19 young stellar superclusters wound around them in projection, the galaxy cluster SDSS J1531+3414 (z = 0.335) offers an excellent laboratory to study the interplay between mergers, active galactic nucleus (AGN) feedback, and star formation. New Chandra X-ray imaging rev…
Toward Unveiling Cosmic Reionization: The Ionizing Photon Production Efficiency (ξ ion) of Low-mass Hα Emitters at z ∼ 2.3
Nakajima, Kimihiko; Spitler, Lee; Motohara, Kentaro +2 more
We investigate the galaxy properties of ∼400 low-mass (<109 M ⊙) Hα emitters (HAEs) at z ∼ 2.3 in the ZFOURGE survey. The selection of these HAEs is based on the excess in the observed K s broadband flux compared to the stellar continuum estimated from the best-fit spectral energy distribution. These low-mass …
JADES Ultrared Flattened Objects: Morphologies and Spatial Gradients in Color and Stellar Populations
Bunker, Andrew J.; Maiolino, Roberto; Willott, Chris +20 more
One of the more surprising findings after the first year of JWST observations is the large number of spatially extended galaxies (ultrared flattened objects, or UFOs) among the optically faint galaxy (OFG) population otherwise thought to be compact. Leveraging the depth and survey area of the JWST Advanced Deep Extragalactic Survey, we extend obse…
A baseline on the relation between chemical patterns and the birth stellar cluster
Jofré, P.; Signor, T.; Martí, L. +1 more
Context. The chemical composition of a star's atmosphere reflects the chemical composition of its birth environment. Therefore, it should be feasible to recognize stars born together that have scattered throughout the galaxy, solely based on their chemistry. This concept, known as "strong chemical tagging", is a major objective of spectroscopic st…
Unveiling the Cosmic Cradle: clustering and massive star formation in the enigmatic Galactic bubble N59
Ojha, D. K.; Paulson, Sonu Tabitha; Mallick, K. K.
In this paper, we have conducted an investigation focused on a segment of the Spitzer mid-infrared bubble N59, specifically referred to as R1 within our study. Situated in the inner Galactic plane, this region stands out for its hosting of five 6.7 GHz methanol masers, as well as numerous compact $\mathrm{H}\, \rm {{\small II}}$ regions, massive c…
VELOcities of CEpheids (VELOCE): II. Systematic search for spectroscopic binary cepheids
Anderson, Richard I.; Szabados, László; Mowlavi, Nami +4 more
Classical Cepheids provide valuable insights into the evolution of stellar multiplicity among intermediate-mass stars. Here, we present a systematic investigation of single-lined spectroscopic binaries (SB1s) based on high-precision velocities measured by the VELOcities of CEpheids (VELOCE) project. We detected 76 (29%) SB1 systems among the 258 M…