Search Publications
A Rapid Sequence of Solar Energetic Particle Events Associated with a Series of Extreme-ultraviolet Jets: Solar Orbiter, STEREO-A, and Near-Earth Spacecraft Observations
Lario, D.; Zhukov, A. N.; Jebaraj, I. C. +28 more
A series of solar energetic electron (SEE) events was observed from 2022 November 9 to November 15 by Solar Orbiter, STEREO-A, and near-Earth spacecraft. At least 32 SEE intensity enhancements at energies >10 keV were clearly distinguishable in Solar Orbiter particle data, with 13 of them occurring on November 11. Several of these events were a…
Infrared Spectroscopic and Physical Properties of Methanol Ices—Reconciling the Conflicting Published Band Strengths of an Important Interstellar Solid
Gerakines, Perry A.; Yarnall, Yukiko Y.; Hudson, Reggie L.
Infrared spectroscopic observations have established the presence of solid methanol (CH3OH) in the interstellar medium and in solar system ices, but the abundance of frozen CH3OH cannot be deduced without accurate band strengths, optical constants, and reference spectra. In this paper we identify disagreements, omissions, and…
Recovering the gas properties of protoplanetary disks through parametric visibility modeling: MHO 6
Pinilla, P.; Kurtovic, N. T.
Context. The composition and distribution of the gas in a protoplanetary disk plays a key role in shaping the outcome of the planet formation process. Observationally, the recovery of information such as the emission height and brightness temperature from interfer-ometric data is often limited by the imaging processes.
Aims: To overcome the l…
Ly Halo Properties and Dust in the Circumgalactic Medium of z ∼ 2 Star-forming Galaxies
Shapley, Alice E.; Steidel, Charles C.; Reddy, Naveen A. +7 more
We present Keck Cosmic Web Imager integral-field unit observations around extended Lyα halos of 27 typical star-forming galaxies with redshifts 2.0 < z < 3.2 drawn from the MOSFIRE Deep Evolution Field survey. We examine the average Lyα surface brightness profiles in bins of star formation rate (SFR), stellar mass (M *), age, stel…
The remarkable microquasar S26: A super-Eddington PeVatron
Romero, Gustavo E.; Abaroa, Leandro; Mancuso, Giulio C. +1 more
Context. S26 is an extragalactic microquasar with the most powerful jets ever discovered. They have a kinetic luminosity of Lj ∼ 5 × 1040 erg s‑1. This implies that the accretion power to the black hole should be super-Eddington, of the order of Lacc ∼ Lj. However, the observed X-ray flux of t…
Observation of the Mars O2 visible nightglow by the NOMAD spectrometer onboard the Trace Gas Orbiter
Vandaele, A. C.; Daerden, F.; Thomas, I. R. +9 more
On Mars, atomic oxygen controls the carbon dioxide radiative cooling of the upper atmosphere and the presence of an ozone layer near the poles. To remotely probe meridional transport of O atoms from the summer to the winter hemisphere and the descending flow in the winter polar regions, the O2 Herzberg II atmospheric emission could be u…
Toward Exoplanet Transit Spectroscopy Using JWST/MIRI's Medium Resolution Spectrometer
Deming, Drake; Lustig-Yaeger, Jacob; Fu, Guangwei +9 more
The Mid-Infrared Instrument Medium Resolution Spectrometer (the MRS) on JWST has potentially important advantages for transit and eclipse spectroscopy of exoplanets, including lack of saturation for bright host stars, wavelength span to longward of 20 µm, and JWST's highest spectral resolving power. We here test the performance of the MRS for time…
The only inflated brown dwarf in an eclipsing white dwarf-brown dwarf binary: WD1032+011B
Mayorga, L. C.; Lothringer, Joshua D.; Parmentier, Vivien +9 more
Due to their short orbital periods and relatively high-flux ratios, irradiated brown dwarfs in binaries with white dwarfs offer better opportunities to study irradiated atmospheres than hot Jupiters, which have lower planet-to-star flux ratios. WD1032+011 is an eclipsing, tidally locked white dwarf-brown dwarf binary with a 9950 K white dwarf orbi…
A unified framework for global auroral morphologies of different planets
Merkin, V. G.; Lyon, J. G.; Delamere, P. A. +8 more
Planetary magnetic fields control energetic particles in their space environments and guide particles to polar atmospheres, where they produce stunning auroral forms. As revealed by spacecraft measurements of the Earth, Saturn and Jupiter, the pathways of energetic particles to these planetary polar atmospheres are diverse, suggesting that there a…
The SAMI galaxy survey: on the importance of applying multiple selection criteria for finding Milky Way analogues
Bland-Hawthorn, Joss; van de Sande, Jesse; Sweet, Sarah M. +10 more
Milky Way analogues (MWAs) provide an alternative insight into the various pathways that lead to the formation of disc galaxies with similar properties to the Milky Way (MW). In this study, we explore different selection techniques for identifying MWAs in the Sydney-AAO (Australian Astronomical Observatory) Multi-object Integral field spectrograph…