Search Publications
Discovery of Extended Tidal Tails around the Globular Cluster Palomar 13
Price-Whelan, Adrian M.; Mateu, Cecilia; Drlica-Wagner, Alex +2 more
We use photometry from the DECam Legacy Survey to detect candidate tidal tails extending ∼5° on either side of the Palomar 13 globular cluster. The tails are aligned with the proper motion of Palomar 13 and are consistent with its old, metal-poor stellar population. We identify three RR Lyrae stars (RRLs) that are plausibly associated with the tai…
Probing the Evolutionary History of Comets: An Investigation of the Hypervolatiles CO, CH4, and C2H6 in the Jupiter-family Comet 21P/Giacobini-Zinner
Feaga, Lori M.; Cochran, Anita L.; Vervack, Ronald J., Jr. +13 more
Understanding the cosmogonic record encoded in the parent volatiles stored in cometary nuclei requires investigating whether evolution (thermal or otherwise) has modified the composition of short-period comets during successive perihelion passages. As the most volatile molecules systematically observed in comets, the abundances of CO, CH4
VVVX-Gaia discovery of a low luminosity globular cluster in the Milky Way disk
Minniti, D.; Rejkuba, M.; Ripepi, V. +21 more
Context. Milky Way globular clusters (GCs) are difficult to identify at low Galactic latitudes because of high differential extinction and heavy star crowding. The new deep near-infrared (IR) images and photometry from the VISTA Variables in the Via Láctea Extended Survey (VVVX) allow us to chart previously unexplored regions.
Aims: Our long …
Phosphorus-rich stars with unusual abundances are challenging theoretical predictions
Masseron, Thomas; García-Hernández, D. A.; Zamora, Olga +4 more
Almost all chemical elements have been made by nucleosynthetic reactions in various kind of stars and have been accumulated along our cosmic history. Among those elements, the origin of phosphorus is of extreme interest because it is known to be essential for life such as we know on Earth. However, current models of (Galactic) chemical evolution u…
ORIGIN: Blind detection of faint emission line galaxies in MUSE datacubes
Bacon, Roland; Piqueras, Laure; Mary, David +2 more
Context. One of the major science cases of the Multi Unit Spectroscopic Explorer (MUSE) integral field spectrograph is the detection of Lyman-alpha emitters at high redshifts. The on-going and planned deep fields observations will allow for one large sample of these sources. An efficient tool to perform blind detection of faint emitters in MUSE da…
Evidence for radio and X-ray auroral emissions from the magnetic B-type star ρ Oph A
Umana, G.; Fossati, L.; Loru, S. +20 more
We present new ATCA multiwavelength radio measurements (range 2.1-21.2 GHz) of the early-type magnetic star ρ Oph A, performed in 2019 March during three different observing sessions. These new ATCA observations evidence a clear rotational modulation of the stellar radio emission and the detection of coherent auroral radio emission from ρ Oph A at…
Considerations for atmospheric retrieval of high-precision brown dwarf spectra
Madhusudhan, Nikku; Piette, Anjali A. A.
Isolated brown dwarfs provide remarkable laboratories for understanding atmospheric physics in the low-irradiation regime, and can be observed more precisely than exoplanets. As such, they provide a glimpse into the future of high-signal-to-noise ratio (SNR) observations of exoplanets. In this work, we investigate several new considerations that a…
Stellar Spins in the Open Cluster NGC 2516
Healy, Brian F.; McCullough, P. R.
Measuring the distribution of stellar spin axis orientations in a coeval group of stars probes the physical processes underlying the stars' formation. In this paper, we use spectrophotometric observations of the open cluster NGC 2516 to determine the degree of spin alignment among its stars. We combine TESS light curves, ground-based spectroscopy …
A 60 kpc Galactic Wind Cone in NGC 3079
Bregman, Joel N.; Yukita, Mihoko; Ptak, Andrew F. +3 more
Galactic winds are associated with intense star formation and active galactic nuclei. Depending on their formation mechanism and velocity, they may remove a significant fraction of gas from their host galaxies, thus suppressing star formation, enriching the intergalactic medium, and shaping the circumgalactic gas. However, the long-term evolution …
Cataloging accreted stars within Gaia DR2 using deep learning
Hopkins, P. F.; Ostdiek, B.; Necib, L. +6 more
Aims: The goal of this study is to present the development of a machine learning based approach that utilizes phase space alone to separate the Gaia DR2 stars into two categories: those accreted onto the Milky Way from those that are in situ. Traditional selection methods that have been used to identify accreted stars typically rely on full 3…