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A high-contrast search for variability in HR 8799bc with VLT-SPHERE
Wagner, Kevin; Apai, Dániel; Zurlo, Alice +11 more
The planets HR8799bc display nearly identical colours and spectra as variable young exoplanet analogs such as VHS 1256-1257ABb and PSO J318.5-22, and are likely to be similarly variable. Here we present results from a 5-epoch SPHERE IRDIS broadband-H search for variability in these two planets. HR 8799b aperture photometry and HR 8799bc negative s…
Distant Relatives: The Chemical Homogeneity of Comoving Pairs Identified in Gaia
Ting, Yuan-Sen; Hawkins, Keith; El-Badry, Kareem +3 more
Comoving pairs, even at the separations of ${ \mathcal O }({10}^{6})$ au, are a predicted reservoir of conatal stars. We present detailed chemical abundances of 62 stars in 31 comoving pairs with separations of 102-107 au and 3D velocity differences <2 km s-1. This sample includes both bound comoving pairs/wide …
NGC 5128 Globular Cluster Candidates Out to 150 kpc: A Comprehensive Catalog from Gaia and Ground-based Data
Forbes, Duncan A.; Caldwell, Nelson; Strader, Jay +9 more
We present a new catalog of 40,502 globular cluster (GC) candidates in NGC 5128 out to a projected radius of ~150 kpc based on data from the Panoramic Imaging Survey of Centaurus and Sculptor, the Gaia Data Release 2, and the NOAO Source Catalog. Ranking these candidates based on the likelihood that they are true GCs, we find that approximately 19…
The effects of rotation on the lithium depletion of G- and K-dwarfs in Messier 35
Jeffries, R. D.; Deliyannis, Constantine P.; Sun, Qinghui +1 more
New fibre spectroscopy and radial velocities from the WIYN telescope are used to measure photospheric lithium in 242 high-probability, zero-age main-sequence F- to K-type members of the rich cluster M35. Combining these with published rotation periods, the connection between lithium depletion and rotation is studied in unprecedented detail. At T
Observations of Magnetic Fields Surrounding LkHα 101 Taken by the BISTRO Survey with JCMT-POL-2
Zhang, Yapeng; Pattle, Kate; Ward-Thompson, Derek +146 more
We report the first high spatial resolution measurement of magnetic fields surrounding LkHα 101, part of the Auriga-California molecular cloud. The observations were taken with the POL-2 polarimeter on the James Clerk Maxwell Telescope within the framework of the B-fields In Star-forming Region Observations (BISTRO) survey. Observed polarization o…
The Atacama Cosmology Telescope: Probing the baryon content of SDSS DR15 galaxies with the thermal and kinematic Sunyaev-Zel'dovich effects
Bond, J. R.; Calabrese, E.; Huffenberger, K. M. +51 more
We present measurements of the average thermal Sunyaev Zel'dovich (tSZ) effect from optically selected galaxy groups and clusters at high signal-to-noise (up to 12 σ ) and estimate their baryon content within a 2.1' radius aperture. Sources from the Sloan Digital Sky Survey Baryon Oscillation Spectroscopic Survey DR15 catalog overlap wi…
A preserved high-z compact progenitor in the heart of NGC 3311 revealed with MUSE 2D stellar population analysis
Hilker, M.; Richtler, T.; Coccato, L. +3 more
Context. Massive early-type galaxies are believed to be the end result of an extended mass accretion history. The stars formed in situ very early on in the initial phase of the mass assembly might have originated from an extremely intense and rapid burst of star formation. These stars may still be found within the cores of such galaxies at z = 0, …
Stars and gas in the most metal-poor galaxies - I. COS and MUSE observations of SBS 0335-052E
Feltre, Anna; Charlot, Stéphane; Chevallard, Jacopo +5 more
Among the nearest most metal-poor starburst-dwarf galaxies known, SBS 0335-052E is the most luminous in integrated nebular He II λ4686 emission. This makes it a unique target to test spectral synthesis models and spectral interpretation tools of the kind that will be used to interpret future rest-frame UV observations of primeval galaxies. Previou…
The source of the major solar energetic particle events from super active region 11944
Brooks, David H.; Yardley, Stephanie L.
Shock waves associated with fast coronal mass ejections (CMEs) accelerate solar energetic particles (SEPs) in the long duration, gradual events that pose hazards to crewed spaceflight and near-Earth technological assets, but the source of the CME shock-accelerated plasma is still debated. Here, we use multi-messenger observations from the Heliophy…
3D MHD astrospheres: applications to IRC-10414 and Betelgeuse
Meyer, D. M. -A.; Mignone, A.; Petrov, M. +3 more
A significative fraction of all massive stars in the Milky Way move supersonically through their local interstellar medium (ISM), producing bow shock nebulae by wind-ISM interaction. The stability of these observed astrospheres around cool massive stars challenges precedent 2D (magneto-)hydrodynamical (MHD) simulations of their surroundings. We pr…