Search Publications
The young massive SMC cluster NGC 330 seen by MUSE. I. Observations and stellar content
Lennon, D. J.; de Mink, S. E.; de Koter, A. +9 more
Context. A majority of massive stars are part of binary systems, a large fraction of which will inevitably interact during their lives. Binary-interaction products (BiPs), that is, stars affected by such interaction, are expected to be commonly present in stellar populations. BiPs are thus a crucial ingredient in the understanding of stellar evolu…
Full of Orions: a 200-pc mapping of the interstellar medium in the redshift-3 lensed dusty star-forming galaxy SDP.81
Andreani, P.; Vegetti, S.; McKean, J. P. +4 more
We present a sub-kpc resolved study of the interstellar medium properties in SDP.81, a $z$ = 3.042 strongly gravitationally lensed, dusty star-forming galaxy, based on high-resolution, multiband ALMA observations of the far-infrared (FIR) continuum, CO ladder, and the [C II] line. Using a visibility-plane lens modelling code, we achieve a median s…
A Comparison of Flare Forecasting Methods. IV. Evaluating Consecutive-day Forecasting Patterns
Leka, K. D.; Gallagher, Peter T.; Murray, Sophie A. +21 more
A crucial challenge to successful flare prediction is forecasting periods that transition between "flare-quiet" and "flare-active." Building on earlier studies in this series in which we describe the methodology, details, and results of flare forecasting comparison efforts, we focus here on patterns of forecast outcomes (success and failure) over …
A Blueprint for the Milky Way's Stellar Populations: The Power of Large Photometric and Astrometric Surveys
Beers, Timothy C.; An, Deokkeun
Recent advances from astronomical surveys have revealed spatial, chemical, and kinematical inhomogeneities in the inner region of the stellar halo of the Milky Way. In particular, large spectroscopic surveys, combined with Gaia astrometric data, have provided powerful tools for analyzing the detailed abundances and accurate kinematics for individu…
Persistent Starspot Signals on M Dwarfs: Multiwavelength Doppler Observations with the Habitable-zone Planet Finder and Keck/HIRES
Cochran, William D.; Endl, Michael; Mahadevan, Suvrath +23 more
Young, rapidly rotating M dwarfs exhibit prominent starspots, which create quasiperiodic signals in their photometric and Doppler spectroscopic measurements. The periodic Doppler signals can mimic radial velocity (RV) changes expected from orbiting exoplanets. Exoplanets can be distinguished from activity-induced false positives by the chromaticit…
Determination of the Local Hubble Constant from Virgo Infall Using TRGB Distances
Lee, Myung Gyoon; Kang, Jisu; Jang, In Sung +1 more
An independent determination of H0 is crucial given the growing tension between the Hubble constant, H0, derived locally and that determined from the modeling of the cosmic microwave background (CMB) originating in the early universe. In this work, we present a new determination of H0 using velocities and tip of th…
A joint SZ-X-ray-optical analysis of the dynamical state of 288 massive galaxy clusters
Smith, M.; Lidman, C.; Zenteno, A. +77 more
We use imaging from the first three years of the Dark Energy Survey to characterize the dynamical state of 288 galaxy clusters at 0.1 ≲ z ≲ 0.9 detected in the South Pole Telescope (SPT) Sunyaev-Zeldovich (SZ) effect survey (SPT-SZ). We examine spatial offsets between the position of the brightest cluster galaxy (BCG) and the centre of the gas dis…
WISPR Imaging of a Pristine CME
Kouloumvakos, Athanasios; Rouillard, Alexis P.; Stenborg, Guillermo +6 more
The Wide-field Imager for Solar Probe (WISPR) on board the Parker Solar Probe (PSP) observed a coronal mass ejection (CME) on 2018 November 1, the first day of the initial PSP encounter. The speed of the CME, approximately 200-300 km s-1 in the WISPR field of view, is typical of slow, streamer blowout CMEs. This event was also observed …
On the first δ Sct-roAp hybrid pulsator and the stability of p and g modes in chemically peculiar A/F stars
Murphy, Simon J.; Hey, Daniel R.; Saio, Hideyuki +4 more
Strong magnetic fields in chemically peculiar A-type (Ap) stars typically suppress low-overtone pressure modes (p modes) but allow high-overtone p modes to be driven. KIC 11296437 is the first star to show both. We obtained and analysed a Subaru spectrum, from which we show that KIC 11296437 has abundances similar to other magnetic Ap stars, and w…
The Leoncino Dwarf Galaxy: Exploring the Low-metallicity End of the Luminosity-Metallicity and Mass-Metallicity Relations
Cannon, John M.; Dolphin, Andrew E.; Skillman, Evan D. +10 more
Extremely metal-poor (XMP) galaxies are low-mass, star-forming galaxies with gas-phase oxygen abundances below 12 + log(O/H) = 7.35 (∼ 1/20 Z⊙). Galaxy evolution scenarios suggest three pathways to form an XMP: (1) secular evolution at low galaxy masses, (2) slow evolution in voids, or (3) dilution of measured abundances from infall of …