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Characterization of Low-mass K2 Planet Hosts Using Near-infrared Spectroscopy
Vanderburg, Andrew; Montet, Benjamin T.; Christiansen, Jessie L. +3 more
We present moderate resolution near-infrared spectra in the H, J, and K band of M-dwarf hosts to candidate transiting exoplanets discovered by NASA’s K2 mission. We employ known empirical relationships between spectral features and physical stellar properties to measure the effective temperature, radius, metallicity, and luminosity of our sample. …
Deuterated methanol toward NGC 7538-IRS1
Fedele, D.; Favre, C.; Lefloch, B. +7 more
We investigate the deuteration of methanol towards the high-mass star-forming region NGC 7538-IRS1. We carried out a multi-transition study of CH3OH, 13CH3OH, and the deuterated flavors, CH2DOH and CH3OD, between 1.0 and 1.4 mm with the IRAM-30 m antenna. In total, 34 13CH3
Variability of Precipitating Ion Fluxes During the September 2017 Event at Mars
Holmström, M.; Leblanc, F.; Luhmann, J. +15 more
In this work, we study the influence of the September 2017 solar event on the precipitating heavy ion fluxes toward Mars' atmosphere as seen by Mars Atmosphere and Volatile EvolutioN/Solar Wind Ion Analyzer, an energy and angular ion spectrometer and by Mars Atmosphere and Volatile EvolutioN/Suprathermal and Thermal Ion Composition instrument, an …
Awakening of the Fast-spinning Accreting Be/X-Ray Pulsar A0538-66
Mereghetti, Sandro; Santangelo, Andrea; Ducci, Lorenzo
A0538-66 is a Be/X-ray binary (Be/XRB) hosting a 69 ms pulsar It emitted bright X-ray outbursts with peak luminosity up to ∼1039 erg s-1 during the first years after its discovery in 1977. Since then, it was always seen in quiescence or during outbursts with L x ≲ 4 × 1037 erg s-1. In 2018 we …
A Multi-epoch X-Ray Study of the Spiral Galaxy NGC 7331
Kong, Albert K. H.; Jin, Ruolan
X-ray point sources in galaxies are dominated by X-ray binaries (XRBs) that are variables or transients, and whether their variability would alter the X-ray luminosity functions (XLFs) is still in debate. Here we report on NGC 7331 as an example to test this with seven Chandra observations. Their detection limit is 7 × 1037 erg s-1…
Runaway O-star Bow Shocks as Particle Accelerators? The Case of AE Aur Revisited
Rangelov, Blagoy; Federman, S. R.; Montmerle, Thierry +2 more
We present results of our Chandra/ACIS observations of the field centered on the fast, runaway O star AE Aur and its bow shock. Previous XMM-Newton observations revealed an X-ray “blob” near the IR arc tracing the bow shock, possibly a nonthermal source consistent with models of Inverse Compton scattering of dust IR photons by electrons accelerate…
Spectroscopy of NGC 4258 Globular Cluster Candidates: Membership Confirmation and Kinematics
González-Lópezlira, Rosa A.; Georgiev, Iskren Y.; Loinard, Laurent +9 more
We present multiobject spectroscopic observations of 23 globular cluster candidates (GCCs) in the prototypical megamaser galaxy NGC 4258, carried out with the Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy instrument at the 10.4 m Gran Telescopio Canarias. The candidates have been selected based on the (u* - i‧)…
Cassini UVIS Detection of Saturn's North Polar Hexagon in the Grand Finale Orbits
Lamy, L.; West, R. A.; Esposito, L. W. +6 more
Cassini's final orbits in 2016 and 2017 provided unprecedented spatial resolution of Saturn's polar regions from near-polar spacecraft viewing geometries. Long-wavelength channels of Cassini's Ultraviolet Imaging Spectrograph instrument detected Saturn's UV-dark north polar hexagon near 180 nm at planetocentric latitudes near 75°N. The dark polar …
X-ray and radio studies of SNR CTB 37B hosting the magnetar CXOU J171405.7-381031
Safi-Harb, Samar; Kothes, Roland; Gotthelf, Eric V. +2 more
We present a Chandra and XMM-Newton study of the supernova remnant (SNR) CTB 37B, along with archival radio observations. In radio wavelengths, the SNR CTB 37B is an incomplete shell showing bright emission from the eastern side, while the X-ray morphology shows diffuse emission from regions surrounding the magnetar CXOU J171405.7-381031. We used …
Multifractal detrended moving average analysis of Kepler stars with surface differential rotation traces
De Medeiros, J. R.; de Freitas, D. B.; Das Chagas, M. L. +2 more
A multifractal formalism is employed to analyse high-precision time-series data of Kepler stars with surface differential rotation (DR) traces. The multifractal detrended moving average (MFDMA) algorithm has been explored to characterize the multiscale behaviour of the observed time series from a sample of 662 stars selected with parameters close …