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The young massive SMC cluster NGC 330 seen by MUSE. III. Stellar parameters and rotational velocities
Wang, C.; Dufton, P. L.; de Mink, S. E. +11 more
Context. The origin of the initial rotation rates of stars, and how a star's surface rotational velocity changes during the evolution, either by internal angular momentum transport or due to interactions with a binary companion, remain open questions in stellar astrophysics.
Aims: Here, we aim to derive the physical parameters and study the d…
Hydrogen column density variability in a sample of local Compton-thin AGN
Ajello, M.; Marchesi, S.; Torres-Albà, N. +5 more
We present the analysis of multiepoch observations of a set of 12 variable, Compton-thin, local (z < 0.1) active galactic nuclei (AGN) selected from the 100-month BAT catalog. We analyzed all available X-ray data from Chandra, XMM-Newton, and NuSTAR, adding up to a total of 53 individual observations. This corresponds to between three and seven…
Dependence of Chemical Abundance on the Cosmic-Ray Ionization Rate in IC 348
Li, Di; Wang, Junzhi; Yue, Nannan +8 more
Ions (e.g., ${{\rm{H}}}_{3}^{+}$ , H2O+) have been used extensively to quantify the cosmic-ray ionization rate (CRIR) in diffuse sightlines. However, measurements of the CRIR in low-to-intermediate density gas environments are rare, especially when background stars are absent. In this work, we combine molecular line observati…
The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). V. The Structure of M33 in Resolved Stellar Populations
Bell, Eric F.; Williams, Benjamin F.; Choi, Yumi +14 more
We present a detailed analysis of the structure of the Local Group flocculent spiral galaxy M33, as measured using the Panchromatic Hubble Andromeda Treasury Triangulum Extended Region (PHATTER) survey. Leveraging the multiwavelength coverage of PHATTER, we find that the oldest populations are dominated by a smooth exponential disk with two distin…
The clumpy structure of ϵ Eridani's debris disc revisited by ALMA
Cruz-Sáenz de Miera, Fernando; Dent, William R. F.; Wyatt, Mark C. +8 more
ϵ Eridani is the closest star to our Sun known to host a debris disc. Prior observations in the (sub-)millimetre regime have potentially detected clumpy structure in the disc and attributed this to interactions with an (as yet) undetected planet. However, the prior observations were unable to distinguish between structure in the disc and backgroun…
CHIME Discovery of a Binary Pulsar with a Massive Nondegenerate Companion
Ransom, Scott M.; van Kerkwijk, M. H.; Kaspi, Victoria M. +25 more
Of the more than 3000 radio pulsars currently known, only ~300 are in binary systems, and only five of these consist of young pulsars with massive nondegenerate companions. We present the discovery and initial timing, accomplished using the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope, of the sixth such binary pulsar, PSR J2108…
Photometric variability of the LAMOST sample of magnetic chemically peculiar stars as seen by TESS
Paunzen, E.; Shultz, M. E.; Bernhard, K. +2 more
Context. High-quality light curves from space-based missions have opened up a new window on the rotational and pulsational properties of magnetic chemically peculiar (mCP) stars and have fuelled asteroseismic studies. They allow the internal effects of surface magnetic fields to be probed and numerous astrophysical parameters to be derived with gr…
Deep Orbital Search for Additional Planets in the HR 8799 System
Do Ó, Clarissa R.; De Rosa, Robert J.; Macintosh, Bruce +6 more
The HR 8799 system hosts four massive planets orbiting 15 and 80 au. Studies of the system's orbital stability and its outer debris disk open the possibility of additional planets, both interior to and exterior to the known system. Reaching a sufficient sensitivity to search for interior planets is very challenging due to the combination of bright…
Type II-P supernova progenitor star initial masses and SN 2020jfo: direct detection, light-curve properties, nebular spectroscopy, and local environment
Kilpatrick, Charles D.; Izzo, Luca; Bentley, Rory O. +23 more
We present optical, ultraviolet, and infrared data of the type II supernova (SN II) 2020jfo at 14.5 Mpc. This wealth of multiwavelength data allows us to compare different metrics commonly used to estimate progenitor masses of SN II for the same object. Using its early light curve, we infer SN 2020jfo had a progenitor radius of ≈700 R⊙,…
Evolution of the Lyman-α-emitting fraction and UV properties of lensed star-forming galaxies in the range 2.9 < z < 6.7
Richard, J.; Pello, R.; Tuan-Anh, P. +6 more
Context. Faint galaxies are theorised to have played a major role, perhaps the dominant role, in reionising the Universe. Their properties, as well as the Lyman-α emitter (LAE) fraction, XLAE, could provide useful insights into this epoch.
Aims: We used four clusters of galaxies from the Lensed Lyman-alpha MUSE Arcs Sample (LLAMAS)…