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Kojima-1Lb Is a Mildly Cold Neptune around the Brightest Microlensing Host Star
Kuzuhara, M.; Tamura, M.; Alonso, R. +57 more
We report the analysis of additional multiband photometry and spectroscopy and new adaptive optics (AO) imaging of the nearby planetary microlensing event TCP J05074264+2447555 (Kojima-1), which was discovered toward the Galactic anticenter in 2017 (Nucita et al.). We confirm the planetary nature of the light-curve anomaly around the peak while fi…
Consistent accretion-induced heating of the neutron-star crust in MXB 1659-29 during two different outbursts
Degenaar, N.; Wijnands, R.; Homan, J. +10 more
Monitoring the cooling of neutron-star crusts heated during accretion outbursts allows us to infer the physics of the dense matter present in the crust. We examine the crust cooling evolution of the low-mass X-ray binary MXB 1659-29 up to ∼505 days after the end of its 2015 outburst (hereafter outburst II) and compare it with what we observed afte…
Mapping the Interstellar Reddening and Extinction toward Baade’s Window Using Minimum Light Colors of ab-type RR Lyrae Stars: Revelations from the De-reddened Color-Magnitude Diagrams
Cenko, S. Bradley; Cunha, Katia; Olsen, Knut +21 more
We have obtained repeated images of six fields toward the Galactic bulge in five passbands (u, g, r, i, z) with the DECam imager on the Blanco 4 m telescope at CTIO. From more than 1.6 billion individual photometric measurements in the field centered on Baade’s window, we have detected 4877 putative variable stars. A total of 474 of these have bee…
Radial abundance gradients in the outer Galactic disk as traced by main-sequence OB stars
McMillan, P. J.; Oey, M. S.; Borges Fernandes, M. +8 more
Context. Elemental abundance gradients in galactic disks are important constraints for models of how spiral galaxies form and evolve. However, the abundance structure of the outer disk region of the Milky Way is poorly known, which hampers our understanding of the spiral galaxy that is closest to us and that can be studied in greatest detail. Youn…
Background modelling for γ-ray spectroscopy with INTEGRAL/SPI
Diehl, Roland; Greiner, Jochen; Siegert, Thomas +3 more
Context. The coded-mask spectrometer-telescope SPI on board the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) records photons in the energy range between 20 and 8000 keV. A robust and versatile method for modelling the dominating instrumental background radiation is difficult to establish for such a telescope in the rapidly changing s…
On measuring the Galactic dark matter halo with hypervelocity stars
Rossi, E. M.; Marchetti, T.; Contigiani, O.
Hypervelocity stars (HVSs) travel from the Galactic Centre across the dark matter halo of the Milky Way, where they are observed with velocities in excess of the Galactic escape speed. Because of their quasi-radial trajectories, they represent a unique probe of the still poorly constrained dark matter component of the Galactic potential. In this p…
The Methane Diurnal Variation and Microseepage Flux at Gale Crater, Mars as Constrained by the ExoMars Trace Gas Orbiter and Curiosity Observations
Atreya, Sushil K.; Newman, Claire E.; Moores, John E. +8 more
The upper bound of 50 parts per trillion by volume for Mars methane above 5 km established by the ExoMars Trace Gas Orbiter, substantially lower than the 410 parts per trillion by volume average measured overnight by the Curiosity Rover, places a strong constraint on the daytime methane flux at the Gale crater. We propose that these measurements m…
Unexpected Behavior of the Solar Wind Mass Flux During Solar Maxima: Two Peaks at Middle Heliolatitudes
Quémerais, Eric; Koutroumpa, Dimitra; Katushkina, Olga +2 more
In this work we study the temporal and latitudinal variations of the solar wind mass flux at 1 AU derived from SOHO/SWAN data on backscattered solar Lyman-α radiation in 1996 - 2018. Previously Katushkina et al. (J. Geophys. Res.118, 2800, 2013) have shown that the latitudinal profiles of the solar wind mass flux during the solar maximum 2001 - 20…
Evidence for Inside-out Galaxy Growth and Quenching of a z ∼ 2 Compact Galaxy From High-resolution Molecular Gas Imaging
Weiner, Benjamin J.; Bezanson, Rachel; Williams, Christina C. +2 more
We present high spatial resolution imaging of the CO(1-0) line from the Karl G. Jansky Very Large Array of COSMOS 27289, a massive, compact star-forming galaxy (SFG) at z = 2.234. This galaxy was selected because of its structural similarity to z ∼ 2 passive galaxies. Our previous observations showed that it is very gas poor with respect to typica…
A relativistic disc reflection model for 1H0419-577: Multi-epoch spectral analysis with XMM-Newton and NuSTAR
Fabian, Andrew C.; Walton, Dominic J.; Jiang, Jiachen +1 more
We present a detailed analysis of the spectral properties of the Seyfert 1 galaxy 1H0419-577, based on the archival XMM-Newton, NuSTAR, and simultaneous Swift observations taken between 2002 and 2015. All the observations show a broad emission line feature at the iron band. We demonstrate that the broad-band spectral variability at different level…