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ACCESS: a featureless optical transmission spectrum for WASP-19b from Magellan/IMACS
Fortney, Jonathan J.; López-Morales, Mercedes; Jordán, Andrés +13 more
The short-period (0.94-d) transiting exoplanet WASP-19b is an exceptional target for transmission spectroscopy studies, due to its relatively large atmospheric scale height (∼500 km) and equilibrium temperature (∼2100 K). Here, we report on six precise spectroscopic Magellan/IMACS observations, five of which target the full optical window from 0.4…
The pattern speed of the Milky Way bar from transverse velocities
Evans, N. Wyn; Sanders, Jason L.; Smith, Leigh
We use the continuity equation to derive a method for measuring the pattern speed of the Milky Way's bar/bulge from proper motion data. The method has minimal assumptions but requires complete coverage of the non-axisymmetric component in two of the three Galactic coordinates. We apply our method to the proper motion data from a combination of Gai…
The GREATS H β + [O III] luminosity function and galaxy properties at z ∼ 8: walking the way of JWST
Oesch, P. A.; Bouwens, R. J.; Illingworth, G. D. +5 more
The James Webb Space Telescope will allow to spectroscopically study an unprecedented number of galaxies deep into the reionization era, notably by detecting [O III]λλ4959, 5007, and H β nebular emission lines. To efficiently prepare such observations, we photometrically select a large sample of galaxies at z ∼ 8 and study their rest-frame optical…
Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization
Tamura, M.; Nagel, E.; Amado, P. J. +73 more
We report the detection of a transiting Earth-size planet around GJ 357, a nearby M2.5 V star, using data from the Transiting Exoplanet Survey Satellite (TESS). GJ 357 b (TOI-562.01) is a transiting, hot, Earth-sized planet (Teq = 525 ± 11 K) with a radius of Rb = 1.217 ± 0.084 R⊕ and an orbital period of Pb
Surface Rotation and Photometric Activity for Kepler Targets. I. M and K Main-sequence Stars
García, R. A.; Pinsonneault, M. H.; Mathur, S. +5 more
Brightness variations due to dark spots on the stellar surface encode information about stellar surface rotation and magnetic activity. In this work, we analyze the Kepler long-cadence data of 26,521 main-sequence stars of spectral types M and K in order to measure their surface rotation and photometric activity level. Rotation-period estimates ar…
Analysis of Helium-rich White Dwarfs Polluted by Heavy Elements in the Gaia Era
Bergeron, P.; Dufour, P.; Allard, N. F. +4 more
We present an analysis of 1023 DBZ/DZ(A) and 319 DQ white dwarf stars taken from the Montreal White Dwarf Database. This represents a significant increase over the previous comprehensive studies on these types of objects. We use new trigonometric parallax measurements from the Gaia second data release, together with photometry from the Sloan Digit…
Ingredients for solar-like systems: protostar IRAS 16293-2422 B versus comet 67P/Churyumov-Gerasimenko
van Dishoeck, Ewine F.; Drozdovskaya, Maria N.; Jørgensen, Jes K. +2 more
Our modern day Solar System has 4.6 × 109 yr of evolution behind it with just a few relics of its birth conditions remaining. Comets are thought to be some of the most pristine tracers of the initial ingredients that were combined to produce the Earth and the other planets. Other low-mass protostars may be analogous to our proto-Sun and…
Carbon, oxygen, and iron abundances in disk and halo stars. Implications of 3D non-LTE spectral line formation
Skúladóttir, Á.; Amarsi, A. M.; Nissen, P. E.
The abundances of carbon, oxygen, and iron in late-type stars are important parameters in exoplanetary and stellar physics, as well as key tracers of stellar populations and Galactic chemical evolution. However, standard spectroscopic abundance analyses can be prone to severe systematic errors, based on the assumption that the stellar atmosphere i…
The Hubble Legacy Field GOODS-S Photometric Catalog
Franx, Marijn; Mowla, Lamiya; Labbé, Ivo +12 more
This manuscript describes the public release of the Hubble Legacy Fields (HLF) project photometric catalog for the extended GOODS-South region from the Hubble Space Telescope (HST) archival program AR-13252. The analysis is based on the version 2.0 HLF data release that now includes all ultraviolet (UV) imaging, combining three major UV surveys. T…
Hyades tidal tails revealed by Gaia DR2
Goldman, Bertrand; Röser, Siegfried; Schilbach, Elena
Aims: Within a 200 pc sphere around the Sun, we search for the Hyades tidal tails in the Gaia DR2 dataset.
Methods: We used a modified convergent-point method to search for stars with space velocities close to the space velocity of the Hyades cluster.
Results: We find a clear indication for the existence of the Hyades tidal tails, a…