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The magnetic early B-type stars - III. A main-sequence magnetic, rotational, and magnetospheric biography
Wade, G. A.; Neiner, C.; Shultz, M. E. +10 more
Magnetic confinement of stellar winds leads to the formation of magnetospheres, which can be sculpted into centrifugal magnetospheres (CMs) by rotational support of the corotating plasma. The conditions required for the CMs of magnetic early B-type stars to yield detectable emission in H α - the principal diagnostic of these structures - are poorl…
Dynamics of cluster-forming hub-filament systems. The case of the high-mass star-forming complex Monoceros R2
Schneider, N.; Tremblin, P.; Didelon, P. +15 more
Context. High-mass stars and star clusters commonly form within hub-filament systems. Monoceros R2 (hereafter Mon R2), at a distance of 830 pc, harbors one of the closest of these systems, making it an excellent target for case studies.
Aims: We investigate the morphology, stability and dynamical properties of the Mon R2 hub-filament system. …
A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS
Henning, Thomas; Smalley, Barry; Chaplin, William J. +139 more
We present the discovery of HD 221416 b, the first transiting planet identified by the Transiting Exoplanet Survey Satellite (TESS) for which asteroseismology of the host star is possible. HD 221416 b (HIP 116158, TOI-197) is a bright (V = 8.2 mag), spectroscopically classified subgiant that oscillates with an average frequency of about 430 µ…
A public relativistic transfer function model for X-ray reverberation mapping of accreting black holes
Ingram, Adam; García, Javier A.; Mastroserio, Guglielmo +3 more
We present the publicly available model RELTRANS that calculates the light-crossing delays and energy shifts experienced by X-ray photons originally emitted close to the black hole when they reflect from the accretion disc and are scattered into our line of sight, accounting for all general relativistic effects. Our model is fast and flexible enou…
Dynamical Confirmation of a Black Hole in MAXI J1820+070
Armas Padilla, M.; Jiménez-Ibarra, F.; Muñoz-Darias, T. +4 more
We present time-resolved 10.4 m Gran Telescopio Canarias and 4.2 m William Herschel Telescope intermediate resolution spectroscopy of the X-ray transient MAXI J1820+070 (=ASASSN-18ey) obtained during its decline to the quiescent state. Cross-correlation of the 21 individual spectra against late-type templates reveals a sinusoidal velocity modulati…
Dust Unveils the Formation of a Mini-Neptune Planet in a Protoplanetary Ring
Dong, Ruobing; Baruteau, Clément; Pérez, Sebastián +3 more
Rings and radial gaps are ubiquitous in protoplanetary disks, yet their possible connection to planet formation is currently subject to intense debates. In principle, giant planet formation leads to wide gaps that separate the gas and dust mass reservoir in the outer disk, while lower mass planets lead to shallow gaps that are manifested mainly on…
Comprehensive comparison of models for spectral energy distributions from 0.1 µm to 1 mm of nearby star-forming galaxies
Helou, G.; Ciesla, L.; Boquien, M. +26 more
We have fit the far-ultraviolet (FUV) to sub-millimeter (850 µm) spectral energy distributions (SEDs) of the 61 galaxies from the Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel (KINGFISH). The fitting has been performed using three models: the Code for Investigating GALaxy Evolution (CIGALE), the GRAphite-SILicate appro…
Hot Jupiters Are Destroyed by Tides While Their Host Stars Are on the Main Sequence
Schlaufman, Kevin C.; Hamer, Jacob H.
While cooler giant planets are often observed with nonzero eccentricities, the short-period circular orbits of hot Jupiters suggest that they lose orbital energy and angular momentum due to tidal interactions with their host stars. However, orbital decay has never been unambiguously observed. We use data from Gaia Data Release 2 to show that hot J…
The Inside-out Growth of the Galactic Disk
Ting, Yuan-Sen; Rix, Hans-Walter; Ness, Melissa +2 more
We quantify the inside-out growth of the Milky Way’s low-α stellar disk, modeling the ages, metallicities, and Galactocentric radii of APOGEE red clump stars with 6 kpc < R < 13 kpc. The current stellar distribution differs significantly from that expected from the star formation history due to the redistribution of stars through radial orbi…
Proper Motions of Milky Way Ultra-faint Satellites with Gaia DR2 × DES DR1
Li, Ting S.; Pace, Andrew B.
We present a new, probabilistic method for determining the systemic proper motions of Milky Way (MW) ultra-faint satellites in the Dark Energy Survey (DES). We utilize the superb photometry from the first public data release (DR1) of the DES to select candidate members and cross-match them with the proper motions from the Gaia DR2. We model the ca…