Search Publications
The natural history of `Oumuamua
Bannister, Michele T.; Guilbert-Lepoutre, Aurélie; Meech, Karen J. +12 more
The discovery of the first interstellar object passing through the Solar System, 1I/2017 U1 (`Oumuamua), provoked intense and continuing interest from the scientific community and the general public. The faintness of `Oumuamua, together with the limited time window within which observations were possible, constrained the information available on i…
TESS Reveals that the Nearby Pisces-Eridanus Stellar Stream is only 120 Myr Old
Wright, Jason T.; Cummings, Jeffrey D.; Mamajek, Eric E. +2 more
Pisces-Eridanus (Psc-Eri), a nearby (d ≃ 80-226 pc) stellar stream stretching across ≈120° of the sky, was recently discovered with Gaia data. The stream was claimed to be ≈1 Gyr old, which would make it an exceptional discovery for stellar astrophysics, as star clusters of that age are rare and tend to be distant, limiting their utility as benchm…
Forecasting the Structure and Orientation of Earthbound Coronal Mass Ejections
Kilpua, E. K. J.; Temmer, M.; Mays, M. L. +1 more
Coronal Mass Ejections (CMEs) are the key drivers of strong to extreme space weather storms at the Earth that can have drastic consequences for technological systems in space and on ground. The ability of a CME to drive geomagnetic disturbances depends crucially on the magnetic structure of the embedded flux rope, which is thus essential to predic…
Spitzer Phase Curves of KELT-1b and the Signatures of Nightside Clouds in Thermal Phase Observations
Fortney, Jonathan J.; Showman, Adam P.; Marley, Mark S. +3 more
We observed two full orbital phase curves of the transiting brown dwarf KELT-1b, at 3.6 and 4.5 µm, using the Spitzer Space Telescope. Combined with previous eclipse data from Beatty et al., we strongly detect KELT-1b’s phase variation as a single sinusoid in both bands, with amplitudes of 964 ± 36 ppm at 3.6 µm and 979 ± 54 ppm at 4.5…
Barium and related stars, and their white-dwarf companions. I. Giant stars
Jorissen, A.; Escorza, A.; Boffin, H. M. J. +4 more
Context. Barium and S stars without technetium are red giants and are suspected of being members of binary systems due to their overabundances in heavy elements. These elements are produced by the s-process of nucleosynthesis, despite the stars not being evolved enough to be able to activate the s-process in their interiors. A companion formerly o…
Molecular clouds in the Cosmic Snake normal star-forming galaxy 8 billion years ago
Pérez-González, Pablo G.; Richard, Johan; Schaerer, Daniel +12 more
The cold molecular gas in contemporary galaxies is structured in discrete cloud complexes. These giant molecular clouds (GMCs), with 104-107 solar masses (M⊙) and radii of 5-100 parsecs, are the seeds of star formation1. Highlighting the molecular gas structure at such small scales in distant galaxies is…
Rates and Properties of Supernovae Strongly Gravitationally Lensed by Elliptical Galaxies in Time-domain Imaging Surveys
Nugent, Peter E.; Goobar, Ariel; Goldstein, Daniel A.
Supernovae that are strongly gravitationally lensed (gLSNe) by elliptical galaxies are powerful probes of astrophysics and cosmology that will be discovered systematically by wide-field, high-cadence imaging surveys such as the Zwicky Transient Facility (ZTF) and the Large Synoptic Survey Telescope (LSST). Here we use pixel-level simulations that …
The evolution of coronal mass ejections in the inner heliosphere: Implementing the spheromak model with EUHFORIA
Poedts, S.; Verbeke, C.; Pomoell, J.
Aims: We introduce a new model for coronal mass ejections (CMEs) that has been implemented in the magnetohydrodynamics (MHD) inner heliosphere model EUHFORIA. Utilising a linear force-free spheromak (LFFS) solution, the model provides an intrinsic magnetic field structure for the CME. As a result, the new model has the potential to predict th…
From the far-ultraviolet to the far-infrared - galaxy emission at 0 ≤ z ≤ 10 in the SHARK semi-analytic model
Obreschkow, Danail; Driver, Simon P.; Robotham, Aaron S. G. +8 more
We combine the SHARK semi-analytic model of galaxy formation with the PROSPECT software tool for spectral energy distribution (SED) generation to study the multiwavelength emission of galaxies from the far-ultraviolet (FUV) to the far-infrared (FIR) at 0 ≤ z ≤ 10. We produce a physical model for the attenuation of galaxies across cosmic time by co…
Hybrid-kinetic Simulations of Ion Heating in Alfvénic Turbulence
Quataert, Eliot; Chandran, Benjamin D. G.; Kunz, Matthew W. +1 more
We present three-dimensional, hybrid-kinetic numerical simulations of driven Alfvén-wave turbulence of relevance to the collisionless near-Earth solar wind. Special attention is paid to the spectral transition that occurs near the ion-Larmor scale and to the origins of preferential perpendicular ion heating and of nonthermal wings in the parallel …