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The Rossiter-McLaughlin effect revolutions: an ultra-short period planet and a warm mini-Neptune on perpendicular orbits
Rebolo, R.; Zapatero Osorio, M. R.; Scandariato, G. +34 more
Comparisons of the alignment of exoplanets with a common host star and each other can be used to distinguish among concurrent evolution scenarios for the star and the planets. However, multi-planet systems usually host mini-Neptunes and super-Earths, whose sizes make orbital architecture measurements challenging. We introduce the Rossiter-McLaughl…
The S2 stream: the shreds of a primitive dwarf galaxy
Myeong, G. C.; Belokurov, Vasily; Matteucci, Francesca +12 more
The S2 stream is a kinematically cold stream that is plunging downwards through the Galactic disc. It may be part of a hotter and more diffuse structure called the Helmi stream. We present a multi-instrument chemical analysis of the stars in the metal-poor S2 stream using both high- and low-resolution spectroscopy, complemented with a re-analysis …
The properties of the AGN torus as revealed from a set of unbiased NuSTAR observations
Ajello, M.; Marchesi, S.; Torres-Albà, N. +4 more
The obscuration observed in active galactic nuclei (AGNs) is mainly caused by dust and gas distributed in a torus-like structure surrounding the supermassive black hole. However, the properties of the obscuring torus of an AGN in X-ray have not yet been fully investigated because of a lack of high-quality data and proper models. In this work, we p…
Deriving CME Density From Remote Sensing Data and Comparison to In Situ Measurements
Temmer, M.; Veronig, A. M.; Vršnak, B. +8 more
We determine the three dimensional geometry and deprojected mass of 29 well observed coronal mass ejections (CMEs) and their interplanetary counterparts (ICMEs) using combined Solar Terrestrial Relations Observatory Solar and Heliospheric Observatory white light data. From the geometry parameters, we calculate the volume of the CME for the magneti…
Lithium pollution of a white dwarf records the accretion of an extrasolar planetesimal
Clemens, J. C.; Dufour, P.; Blouin, S. +4 more
Tidal disruption and subsequent accretion of planetesimals by white dwarfs can reveal the elemental abundances of rocky bodies in exoplanetary systems. Those abundances provide information on the composition of the nebula from which the systems formed, which is analogous to how meteorite abundances inform our understanding of the early Solar Syste…
The Evolving Interstellar Medium of Star-forming Galaxies, as Traced by Stardust
Brammer, Gabriel; Daddi, Emanuele; Toft, Sune +13 more
We analyze the far-infrared (FIR) properties of ~5000 star-forming galaxies at z < 4.5, drawn from the deepest, super-deblended catalogs in the GOODS-N and COSMOS fields. We develop a novel panchromatic spectral energy distribution fitting algorithm, Stardust, that models the emission from stars, active galactic nuclei (AGNs), and infrared dust…
The Location of Magnetic Reconnection at Earth's Magnetopause
Fuselier, S. A.; Trattner, K. J.; Petrinec, S. M.
One of the major questions about magnetic reconnection is how specific solar wind and interplanetary magnetic field conditions influence where reconnection occurs at the Earth's magnetopause. There are two reconnection scenarios discussed in the literature: a) anti-parallel reconnection and b) component reconnection. Early spacecraft observations …
New Candidate Extreme T Subdwarfs from the Backyard Worlds: Planet 9 Citizen Science Project
Debes, John H.; Meisner, Aaron M.; Line, Michael R. +27 more
Schneider et al. presented the discovery of WISEA J041451.67-585456.7 and WISEA J181006.18-101000.5, which appear to be the first examples of extreme T-type subdwarfs (esdTs; metallicity ≤-1 dex, Teff ≲ 1400 K). Here, we present new discoveries and follow-up of three T-type subdwarf candidates, with an eye toward expanding the sample of…
Modelling the He I triplet absorption at 10 830 Å in the atmospheres of HD 189733 b and GJ 3470 b
Sánchez-López, A.; López-Puertas, M.; Nagel, E. +16 more
Characterising the atmospheres of exoplanets is key to understanding their nature and provides hints about their formation and evolution. High resolution measurements of the helium triplet absorption of highly irradiated planets have been recently reported, which provide a new means of studying their atmospheric escape. In this work we study the e…
The VMC survey - XLIII. The spatially resolved star formation history across the Large Magellanic Cloud
Sun, Ning-Chen; Girardi, Léo; de Grijs, Richard +19 more
We derive the spatially resolved star formation history (SFH) for a 96 deg2 area across the main body of the Large Magellanic Cloud (LMC), using the near-infrared photometry from the VISTA survey of the Magellanic Clouds (VMC). The data and analyses are characterized by a great degree of homogeneity and a low sensitivity to the interste…