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The MESAS Project: ALMA Observations of the F-type Stars γ Lep, γ Vir A, and γ Vir B
De la Luz, V.; Moór, A.; White, Jacob Aaron +7 more
The spectrum of stars in the submillimeter to centimeter wavelength range remains poorly constrained due to a lack of data for most spectral types. An accurate characterization of stellar emission in this regime is needed to test stellar atmosphere models, and is also essential for revealing emission associated with unresolved circumstellar debris…
Searching for globular cluster chemical anomalies on the main sequence of a young massive cluster
Martocchia, S.; Dalessandro, E.; Salaris, M. +9 more
The spectroscopic and photometric signals of the star-to-star abundance variations found in globular clusters seem to be correlated with global parameters like the cluster's metallicity, mass, and age. Understanding this behaviour could bring us closer to the origin of these intriguing abundance spreads. In this work we use deep HST photometry to …
Mathematical Underpinnings of the Multiwavelength Structure of the Tip of the Red Giant Branch
Madore, Barry F.; Freedman, Wendy L.
We consider the application of the tip of the red giant branch (TRGB) in the optical and in the near-infrared for the determination of distances to nearby galaxies. We analyze ACS VI (F555W and F814W) data and self-consistently cross-calibrate WFC3-IR JH (F110W and F120W) data using an absolute magnitude calibration of MI = -4.05 mag as…
New Candidates for Planetary-mass Brown Dwarfs in IC 348
Luhman, K. L.; Hapich, C. J.
We have used infrared images obtained with the Wide Field Camera 3 on board the Hubble Space Telescope to search for planetary-mass brown dwarfs in the star-forming cluster IC 348. In those images, we have identified 12 objects that have colors indicative of spectral types later than M8, corresponding to masses of ≲30 MJup at the age of…
Validation of PSF models for HST and other space-based observations
Schrabback, Tim; Massey, Richard; Rhodes, Jason +4 more
Forthcoming space-based observations will require high-quality point spread function (PSF) models for weak gravitational lensing measurements. One approach to generating these models is using a wavefront model based on the known telescope optics. We present an empirical framework for validating such models to confirm that they match the actual PSF…
Soft X-ray emission lines in the X-ray binary Swift J1858.6-0814 observed with XMM-Newton Reflection Grating Spectrometer: disc atmosphere or wind?
Díaz Trigo, M.; Altamirano, D.; Knigge, C. +11 more
We find soft X-ray emission lines from the X-ray binary Swift J1858.6-0814 in data from XMM-NewtonReflection Grating Spectrometer (RGS): N VII, O VII, and O VIII, as well as notable residuals short of a detection at Ne IX and other higher ionization transitions. These could be associated with the disc atmosphere, as in accretion disc corona source…
Prediction and Understanding of Soft-proton Contamination in XMM-Newton: A Machine Learning Approach
Tiengo, Andrea; Allen, Robert C.; Kuntz, K. D. +10 more
One of the major and unfortunately unforeseen sources of background for the current generation of X-ray telescopes are few tens to hundreds of keV (soft) protons concentrated by the mirrors. One such telescope is the European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton). Its observing time lost due to background contamination is ab…
The Solar Event of 14 - 15 July 2012 and Its Geoeffectiveness
Gil, Agnieszka; Modzelewska, Renata; Moskwa, Szczepan +5 more
During Solar Cycle 24, which started at the end of 2008, the Sun was calm, and there were not many spectacular geoeffective events. In this article, we analyze the geomagnetic storm that happened on 15 July 2012 during the 602nd anniversary of the Polish Battle of Grunwald, thus we propose this event to be called the "Battle of Grunwald Day Storm"…
Mission Data Processor Aboard the BepiColombo Mio Spacecraft: Design and Scientific Operation Concept
Barabash, Stas; Moncuquet, Michel; Saito, Yoshifumi +25 more
BepiColombo Mio, also known as the Mercury Magnetospheric Orbiter (MMO), is intended to conduct the first detailed study of the magnetic field and environment of the innermost planet, Mercury, alongside the Mercury Planetary Orbiter (MPO). This orbiter has five payload groups; the MaGnetic Field Investigation (MGF), the Mercury Plasma Particle Exp…
Magnetospheric "Penetration" of IMF By Viewed Through the Lens of an Empirical RBF Modeling
Tsyganenko, N. A.; Andreeva, V. A.
The spiral structure of the interplanetary magnetic field (IMF) is known to induce intramagnetospheric azimuthal magnetic field By, which strongly correlates with the IMF By. We reconstruct this effect for the first time in 3-D, using a large set of data taken in the near/inner magnetosphere and a flexible magnetic field model based on expansions …