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Modeling spurious forces on the LISA spacecraft across a full solar cycle
Frank, Barrett M.; Piotrzkowski, Brandon; Bolen, Brett +2 more
One source of noise for the laser interferometer space antenna (LISA) will be time-varying changes of the space environment in the form of solar wind particles and photon pressure from fluctuating solar irradiance. The approximate magnitude of these effects can be estimated from the average properties of the solar wind and the solar irradiance. We…
Observing the Earliest Stages of Star Formation in Galaxies: 8 µm Cores in Three Edge-on Disks
Elmegreen, Bruce G.; Elmegreen, Debra Meloy
To study the vertical distribution of the earliest stages of star formation in galaxies, three edge-on spirals, NGC 891, NGC 3628, and IC 5052, observed by the Spitzer Space Telescope InfraRed Array Camera (IRAC) were examined for compact 8 µm cores using an unsharp mask technique; 173, 267, and 60 cores were distinguished, respectively. Col…
The first observed stellar occultations by the irregular satellite Phoebe (Saturn IX) and improved rotational period
Barry, T.; Snodgrass, C.; Jehin, E. +24 more
We report six stellar occultations by Phoebe (Saturn IX), an irregular satellite of Saturn, obtained between mid-2017 and mid-2019. The 2017 July 6 event was the first stellar occultation by an irregular satellite ever observed. The occultation chords were compared to a 3D shape model of the satellite obtained from Cassini observations. The rotati…
Cluster membership for the long-period Cepheid calibrator SV Vul
Negueruela, I.; Dorda, R.; Marco, A.
Classical Cepheids represent the first step of the distance scale ladder. Claims of tension between the locally calculated Hubble constant and the values deduced from Planck's results have sparked new interest in these distance calibrators. Cluster membership provides an independent distance measurement, as well as astrophysical context for studie…
Quantifying torque from the Milky Way bar using Gaia DR2
Kipper, Rain; Tenjes, Peeter; Tuvikene, Taavi +2 more
We determine the mass of the Milky Way bar and the torque it causes, using Gaia DR2, by applying the orbital arc method. Based on this, we have found that the gravitational acceleration is not directed towards the centre of our Galaxy but a few degrees away from it. We propose that the tangential acceleration component is caused by the bar of the …
A Catalog of Periodic Variables in Open Clusters M35 and NGC 2158
Bouma, L. G.; Bhatti, W.; Bakos, G. Á. +3 more
We present a catalog of 1143 periodic variables, compiled from our image-subtracted photometric analysis of the K2 Campaign-0 super stamp. This super stamp is centered on the open clusters M35 and NGC 2158. Approximately 46% of our periodic variables were previously unreported. Of the catalog variables, we find that 331 are members of M35 and 56 a…
SOIR/VEx observations of water vapor at the terminator in the Venus mesosphere
Vandaele, A. C.; Trompet, L.; Robert, S. +4 more
The Solar Occultation in the InfraRed (SOIR) instrument onboard Venus Express sounded the Venus mesosphere and lower thermosphere using solar occultation geometry between April 2006 and December 2014. The observations were all taken at the terminator. This paper reports on the water vapor vertical distribution above the clouds and geo-temporal var…
HST/COS Spectra of the Wind Lines of VFTS 102 and 285
Gies, Douglas R.; Lester, Kathryn V.; Wang, Luqian +5 more
Rapid rotation in massive stars imposes a latitudinal variation in the mass loss from radiatively driven winds that can lead to enhanced mass loss at the poles (with little angular momentum loss) and/or equator (with maximal angular momentum loss). Here we present an examination of the stellar wind lines of the two O-type stars with the fastest kn…
Modeling the IRIS Lines During a Flare. I. The Blue-wing Enhancement in the Mg II k Line
Ding, M. D.; Li, Ying; Hong, Jie +1 more
The Interface Region Imaging Spectrograph (IRIS) Mg II k line serves as a very good tool to diagnose the heating processes in solar flares. Recent studies have shown that apart from the usual red asymmetries that are interpreted as the result of condensation downflows, this line could also show a blue-wing enhancement. To investigate how such a bl…
A model of the 3-µm hydration band with Exponentially Modified Gaussian (EMG) profiles: Application to hydrated chondrites and asteroids
Schmitt, B.; Beck, P.; Potin, S. +2 more
We present here a new method to model the shape of the 3-µm absorption band in the reflectance spectra of meteorites and small bodies. The band is decomposed into several OH/H2O components using Exponentially Modified Gaussian (EMG) profiles, as well as possible organic components using Gaussian profiles when present. We compare t…