Search Publications
Missions
Journals
Publication Years
The infrared view of dust and molecules around V4334 Sgr (Sakurai's object): a 20-yr retrospective
Gehrz, R. D.; Joyce, R. R.; Eyres, S. P. S. +16 more
We present an analysis of the evolution of circumstellar dust and molecules in the environment of the very late thermal pulse object V4334 Sgr (Sakurai's object) over an ∼20-yr period, drawing on ground-, airborne-, and space-based infrared photometry and spectroscopy. The dust emission, which started in 1997, resembles a blackbody that cooled fro…
Astraea: Predicting Long Rotation Periods with 27 Day Light Curves
Angus, Ruth; Grunblatt, Sam; Agüeros, Marcel A. +5 more
The rotation periods of planet-hosting stars can be used for modeling and mitigating the impact of magnetic activity in radial velocity measurements and can help constrain the high-energy flux environment and space weather of planetary systems. Millions of stars and thousands of planet hosts are observed with the Transiting Exoplanet Survey Satell…
CCD VI time-series of the extremely metal-poor globular cluster M92: revisiting its variable star population
Arellano Ferro, A.; Deras, D.; Yepez, M. A.
We present an analysis of VI CCD time-series photometry of the Oo II type globular cluster M92. The variable star population of the cluster is studied with the aim of revising their classifications, identifications, frequency spectra, and to select indicators of the parental cluster metallicity and distance. The Fourier decomposition of RR Lyrae l…
The Warm Gas in the MW: A Kinematical Model
Bregman, Joel N.; Qu, Zhijie; Lindley, Ryan +2 more
We develop a kinematical model for the Milky Way Si IV-bearing gas to determine its density distribution and kinematics. This model is constrained by a column density line-shape sample extracted from the Hubble Space Telescope/Cosmic Origins Spectrograph archival data, which contains 186 active galactic nucleus sight lines. We find that the Si IV …
HD 117214 debris disk: scattered-light images and constraints on the presence of planets
Quanz, S. P.; Ginski, C.; Henning, Th. +34 more
Context. Young stars with debris disks are the most promising targets for an exoplanet search because debris indicate a successful formation of planetary bodies. Debris disks can be shaped by planets into ring structures that give valuable indications on the presence and location of planets in the disk.
Aims: We performed observations of the …
ZFIRE: Measuring Electron Density with [O II] as a Function of Environment at z = 1.62
Papovich, Casey; Kewley, Lisa J.; Harshan, Anishya +8 more
The global star formation rates (SFR) of galaxies at fixed stellar masses increase with redshift and are known to vary with environment up to z ∼ 2. We explore here whether the changes in the SFRs also apply to the electron densities of the interstellar medium by measuring the [O II] (λ 3726, λ 3729) ratio for cluster and field galaxies at z ∼ 2. …
Large non-radial propagation of a coronal mass ejection on 2011 January 24
Mierla, M.; D'Huys, E.; Stenborg, G. +6 more
Understanding the deflection of coronal mass ejections (CMEs) is of great interest to the space weather community because of their implications for improving the prediction of CME. This paper aims to shed light into the effects of the coronal magnetic field environment on CME trajectories. We analyze the influence of the magnetic environment on th…
High-energy characteristics of the accretion-powered millisecond pulsar IGR J17591-2342 during its 2018 outburst. XMM-Newton, NICER, NuSTAR, and INTEGRAL view of the 0.3-300 keV X-ray band
Tsygankov, S. S.; Kuiper, L.; Poutanen, J. +4 more
IGR J17591-2342 is an accreting millisecond X-ray pulsar, discovered with INTEGRAL, which went into outburst around July 21, 2018. To better understand the physics acting in these systems during the outburst episode, we performed detailed temporal-, timing-, and spectral analyses across the 0.3-300 keV band using data from NICER, XMM-Newton, NuSTA…
On the Coronal Temperature in Solar Microflares
Testa, Paola; Reale, Fabio
We present a study of solar imaging and spectral observations of a microflare, focusing on the temperature diagnostics provided by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory, and the Extreme-Ultraviolet Imaging Spectrometer (EIS) on board Hinode. Our data analysis, in particular from the emission in the 131 and …
MeerKAT HI commissioning observations of MHONGOOSE galaxy ESO 302-G014
Groot, P. J.; Dettmar, R. -J.; Walter, F. +43 more
Aims: We present the results of three commissioning H I observations obtained with the MeerKAT radio telescope. These observations make up part of the preparation for the forthcoming MHONGOOSE nearby galaxy survey, which is a MeerKAT large survey project that will study the accretion of gas in galaxies and the link between gas and star format…