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Highlights of exoplanetary science from Spitzer
Deming, Drake; Knutson, Heather A.
Observations of extrasolar planets were not projected to be a substantial part of the Spitzer Space Telescope's mission when it was conceived and designed. Nevertheless, Spitzer was the first facility to detect thermal emission from a hot Jupiter-sized planet, and the range of its exoplanetary investigations grew to encompass transiting planets, m…
A new model for including galactic winds in simulations of galaxy formation - I. Introducing the Physically Evolved Winds (PhEW) model
Davé, Romeel; Weinberg, David H.; Scannapieco, Evan +5 more
The propagation and evolution of cold galactic winds in galactic haloes is crucial to galaxy formation models. However, modelling of this process in hydrodynamic simulations of galaxy formation is oversimplified owing to a lack of numerical resolution and often neglects critical physical processes such as hydrodynamic instabilities and thermal con…
Elemental Abundances in M31: [Fe/H] and [α/Fe] in M31 Dwarf Galaxies Using Coadded Spectra
Gilbert, Karoline M.; Majewski, Steven R.; Beaton, Rachael L. +5 more
We present chemical abundances of red giant branch (RGB) stars in the dwarf spheroidal (dSph) satellite system of Andromeda (M31), using spectral synthesis of medium-resolution (R ∼ 6000) spectra obtained with the Keck II telescope and Deep Imaging Multi-Object Spectrometer spectrograph via the Spectroscopic and Photometric Landscape of Andromeda'…
Optical and near-infrared observations of the Fried Egg Nebula. Multiple shell ejections on a 100 yr timescale from a massive yellow hypergiant
Millour, F.; de Wit, W. -J.; Szczerba, R. +15 more
Context. The fate of a massive star during the latest stages of its evolution is highly dependent on its mass-loss rate and geometry and therefore knowing the geometry of the circumstellar material close to the star and its surroundings is crucial.
Aims: We aim to provide insight into the nature (i.e. geometry, rates) of mass-loss episodes, a…
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…