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Broadband transmission spectroscopy of HD 209458b with ESPRESSO: evidence for Na, TiO, or both
Bouchy, F.; Rebolo, R.; Pallé, E. +42 more
Context. The detection and characterization of exoplanet atmospheres is currently one of the main drivers pushing the development of new observing facilities. In this context, high-resolution spectrographs are proving their potential and showing that high-resolution spectroscopy will be paramount in this field.
Aims: We aim to make use of ESP…
The luminosity evolution of nova shells. I. A new analysis of old data
Vogt, N.; Ederoclite, A.; Schmidtobreick, L. +3 more
Over the last decade, nova shells have been discovered around a small number of cataclysmic variables that had not been known to be post-novae, while other searches around much larger samples have been mostly unsuccessful. This raises the question about how long such shells are detectable after the eruption and whether this time limit depends on t…
ALMA Observations of Young Eruptive Stars: Continuum Disk Sizes and Molecular Outflows
Hales, Antonio S.; Pérez, Sebastián; Gonzalez-Ruilova, Camilo +7 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm observations of four young, eruptive star-disk systems at 0"4 resolution: two FUors (V582 Aur and V900 Mon), one EXor (UZ Tau E), and one source with an ambiguous FU/EXor classification (GM Cha). The disks around GM Cha, V900 Mon, and UZ Tau E are resolved. These observations in…
TOI 694b and TIC 220568520b: Two Low-mass Companions near the Hydrogen-burning Mass Limit Orbiting Sun-like Stars
Henning, Thomas; Butler, R. Paul; Latham, David W. +40 more
We report the discovery of TOI 694 b and TIC 220568520 b, two low-mass stellar companions in eccentric orbits around metal-rich Sun-like stars, first detected by the Transiting Exoplanet Survey Satellite (TESS). TOI 694 b has an orbital period of 48.05131 ± 0.00019 days and eccentricity of 0.51946 ± 0.00081, and we derive a mass of 89.0 ± 5.3 ${M}…
K2-19b and c are in a 3:2 Commensurability but out of Resonance: A Challenge to Planet Assembly by Convergent Migration
Espinoza, Néstor; Bayliss, Daniel; Fulton, Benjamin J. +11 more
K2-19b and c were among the first planets discovered by NASA’s K2 mission and together stand in stark contrast with the physical and orbital properties of the solar system planets. The planets are between the size of Uranus and Saturn at 7.0 ± 0.2 {R}\oplus and 4.1 ± 0.2 {R}\oplus , respectively, and reside a mere 0.1% outsi…
Dark dust and single-cloud sightlines in the ISM
Krełowski, J.; Siebenmorgen, R.; Bagnulo, S. +2 more
The precise characteristics of clouds and the nature of dust in the diffuse interstellar medium can only be extracted by inspecting the rare cases of single-cloud sightlines. In our nomenclature such objects are identified by interstellar lines, such as K I, that show at a resolving power of λ/Δλ ~ 75 000 one dominating Doppler component that acco…
Forecasting Chemical Abundance Precision for Extragalactic Stellar Archaeology
Ting, Yuan-Sen; Weisz, Daniel R.; Sandford, Nathan R.
Increasingly powerful and multiplexed spectroscopic facilities promise detailed chemical abundance patterns for millions of resolved stars in galaxies beyond the Milky Way (MW). Here, we employ the Cramér-Rao lower bound (CRLB) to forecast the precision to which stellar abundances for metal-poor, low-mass stars outside the MW can be measured for 4…
Source of Energetic Protons in the 2014 September 1 Sustained Gamma-ray Emission Event
Gopalswamy, N.; Yashiro, S.; Mäkelä, P. +3 more
We report on the source of >300 MeV protons during the SOL2014-09-01 sustained gamma-ray emission (SGRE) event based on multi-wavelength data from a wide array of space- and ground-based instruments. Based on the eruption geometry we provide concrete explanation for the spatially and temporally extended γ -ray emission from the eruption. We sho…
On the Ratios of Si IV Lines (λ1394/λ1403) in an Emerging Flux Region
Isobe, Hiroaki; Tripathi, Durgesh; Nived, V. N. +1 more
The resonance lines of Si IV formed at λ1394 and 1403 Å are the most critical for the diagnostics of the solar transition region in the observations of the Interface Region Imaging Spectrograph (IRIS). Studying the intensity ratios of these lines (1394 Å/1403 Å), which under optically thin conditions is predicted to be two, helps us to diagnose th…
Galactic Rotation Parameters Based on Stars from Active Star-Forming Regions with Data from the Gaia DR2 Catalogue
Bobylev, V. V.; Bajkova, A. T.; Krisanova, O. I.
We have studied a sample of more than 25 000 young stars with proper motions and trigonometric parallaxes from the Gaia DR2 catalogue. The relative errors of their parallaxes do not exceed 10$%$. The selection of stars belonging to active star-forming regions was made by Marton et al. based on data from the Gaia DR2 catalogue by invoking infrared …