Search Publications
Signatures of strong magnetization and a metal-poor atmosphere for a Neptune-sized exoplanet
Mikal-Evans, Thomas; Sing, David K.; López-Morales, Mercedes +10 more
The magnetosphere of an exoplanet has yet to be unambiguously detected. Investigations of star-planet interaction and neutral atomic hydrogen absorption during transit to detect magnetic fields in hot Jupiters have been inconclusive, and interpretations of the transit absorption non-unique. In contrast, ionized species escaping a magnetized exopla…
Multiple Channels for the Onset of Magnetism in Isolated White Dwarfs
Landstreet, John D.; Bagnulo, Stefano
The presence of a strong magnetic field is a feature common to a significant fraction of degenerate stars, yet little is understood about the field's origin and evolution. New observational constraints from volume-limited surveys point to a more complex situation than a single mechanism valid for all stars. We show that in high-mass white dwarfs, …
GOALS-JWST: Tracing AGN Feedback on the Star-forming Interstellar Medium in NGC 7469
Inami, Hanae; Böker, Torsten; Law, David R. +34 more
We present James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) integral-field spectroscopy of the nearby merging, luminous infrared galaxy, NGC 7469. This galaxy hosts a Seyfert type-1.5 nucleus, a highly ionized outflow, and a bright, circumnuclear star-forming ring, making it an ideal target to study active galactic nucleus (AGN) fe…
Early Results from GLASS-JWST. I: Confirmation of Lensed z ≥ 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS
Santini, Paola; Castellano, Marco; Fontana, Adriano +29 more
We present the first search for z ≥ 7, continuum-confirmed Lyman break sources with NIRISS/WFS spectroscopy over the Abell 2744 Frontier Fields cluster, as part of the GLASS-JWST-ERS survey. With ~15 hr of preimaging and multiangle grism exposures in the F115W, F150W, and F200W filters, we describe the general data handling (i.e., reduction, clean…
Classifying Be Star Variability With TESS. I. The Southern Ecliptic
Labadie-Bartz, Jonathan; Carciofi, Alex C.; Henrique de Amorim, Tajan +4 more
TESS photometry is analyzed for 430 classical Be stars observed in the first year of the mission. The often complex and diverse variability of each object in this sample is classified to obtain an understanding of the behavior of this class as a population. Ninety-seven percent of the systems are variable above the noise level, with timescales spa…
Asteroid taxonomy from cluster analysis of spectrometry and albedo
Carry, B.; Mahlke, M.; Mattei, P. -A.
Context. The classification of the minor bodies of the Solar System based on observables has been continuously developed and iterated over the past 40 yr. While prior iterations followed either the availability of large observational campaigns or new instrumental capabilities opening new observational dimensions, we see the opportunity to improve …
A major asymmetric ice trap in a planet-forming disk. III. First detection of dimethyl ether
Booth, Alice S.; van Dishoeck, Ewine F.; Nazari, Pooneh +3 more
The complex organic molecules (COMs) detected in star-forming regions are the precursors of the prebiotic molecules that can lead to the emergence of life. By studying COMs in more evolved protoplanetary disks we can gain a better understanding of how they are incorporated into planets. This paper presents ALMA band 7 observations of the dust and …
Distance estimates for AGB stars from parallax measurements
De Beck, E.; Ramstedt, S.; Vlemmings, W. H. T. +1 more
Context. Estimating the distances to asymptotic giant branch (AGB) stars using optical measurements of their parallaxes is not straightforward because of the large uncertainties introduced by their dusty envelopes, their large angular sizes, and their surface brightness variability.
Aims: This paper aims to assess the reliability of the dista…
Data Release 2 of S-PLUS: Accurate template-fitting based photometry covering 1000 deg2 in 12 optical filters
Molino, A.; Werle, A.; Mendes de Oliveira, C. +32 more
The Southern Photometric Local Universe Survey (S-PLUS) is an ongoing survey of ~9300 deg2 in the southern sky in a 12-band photometric system. This paper presents the second data release (DR2) of S-PLUS, consisting of 514 tiles covering an area of 950 deg2. The data has been fully calibrated using a new photometric calibrati…
The R-process Alliance: A Nearly Complete R-process Abundance Template Derived from Ultraviolet Spectroscopy of the R-process-enhanced Metal-poor Star HD 222925
Beers, Timothy C.; Placco, Vinicius M.; Hattori, Kohei +9 more
We present a nearly complete rapid neutron-capture process (r-process) chemical inventory of the metal-poor ([Fe/H] = -1.46 ± 0.10) r-process-enhanced ([Eu/Fe] = +1.32 ± 0.08) halo star HD 222925. This abundance set is the most complete for any object beyond the solar system, with a total of 63 metals detected and seven with upper limits. It compr…