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The Optical Afterglow of GW170817 at One Year Post-merger
Lyman, J. D.; Fruchter, A. S.; Wiersema, K. +9 more
We present observations of the optical afterglow of GRB 170817A, made by the Hubble Space Telescope, between 2018 February and August, up to one year after the neutron star merger GW170817. The afterglow shows a rapid decline beyond 170 days, and confirms the jet origin for the observed outflow, in contrast to more slowly declining expectations fo…
Measurement and implications of Saturn's gravity field and ring mass
Iess, L.; Tortora, P.; Zannoni, M. +10 more
The interior structure of Saturn, the depth of its winds, and the mass and age of its rings constrain its formation and evolution. In the final phase of the Cassini mission, the spacecraft dived between the planet and its innermost ring, at altitudes of 2600 to 3900 kilometers above the cloud tops. During six of these crossings, a radio link with …
Kinematic detection of a planet carving a gap in a protoplanetary disk
Pinte, C.; Ménard, F.; Duchêne, G. +10 more
We still do not understand how planets form or why extrasolar planetary systems are so different from our own Solar System. However, the past few years have dramatically changed our view of the disks of gas and dust around young stars. Observations with the Atacama Large Millimeter/submillimeter Array and extreme adaptive-optics systems have revea…
The CANDELS/SHARDS Multiwavelength Catalog in GOODS-N: Photometry, Photometric Redshifts, Stellar Masses, Emission-line Fluxes, and Star Formation Rates
Barro, Guillermo; Pérez-González, Pablo G.; Castellano, Marco +52 more
We present a WFC3 F160W (H-band) selected catalog in the CANDELS/GOODS-N field containing photometry from the ultraviolet (UV) to the far-infrared (IR), photometric redshifts, and stellar parameters derived from the analysis of the multiwavelength data. The catalog contains 35,445 sources over the 171 arcmin2 of the CANDELS F160W mosaic…
MMT/MMIRS spectroscopy of z = 1.3 - 2.4 extreme [O III] emitters: implications for galaxies in the reionization era
Charlot, Stéphane; Chevallard, Jacopo; Tang, Mengtao +1 more
Galaxies in the reionization era have been shown to have prominent [O III] + H β emission. Little is known about the gas conditions and radiation field of this population, making it challenging to interpret the spectra emerging at z ≳ 6. Motivated by this shortcoming, we have initiated a large MMT spectroscopic survey identifying rest-frame optica…
The ALMA Spectroscopic Survey in the HUDF: CO Luminosity Functions and the Molecular Gas Content of Galaxies through Cosmic History
Carilli, Chris; Somerville, Rachel S.; Bacon, Roland +34 more
We use the results from the ALMA large program ASPECS, the spectroscopic survey in the Hubble Ultra Deep Field (HUDF), to constrain CO luminosity functions of galaxies and the resulting redshift evolution of ρ(H2). The broad frequency range covered enables us to identify CO emission lines of different rotational transitions in the HUDF …
Gaia-derived luminosities of Kepler A/F stars and the pulsator fraction across the δ Scuti instability strip
Bedding, Timothy R.; Murphy, Simon J.; Van Reeth, Timothy +1 more
We study the fraction of stars in and around the δ Scuti instability strip that are pulsating, using Gaia DR2 parallaxes to derive precise luminosities. We classify a sample of over 15 000 Kepler A and F stars into δ Sct and non-δ Sct stars, paying close attention to variability that could have other origins. We find that 18 per cent of the δ Sct …
Accuracy and Precision of Industrial Stellar Abundances
Jofré, Paula; Heiter, Ulrike; Soubiran, Caroline
There has been an incredibly large investment in obtaining high-resolution stellar spectra for determining chemical abundances of stars. This information is crucial to answer fundamental questions in astronomy by constraining the formation and evolution scenarios of the Milky Way as well as the stars and planets residing in it. We have just entere…
1ES 1927+654: An AGN Caught Changing Look on a Timescale of Months
Filippenko, Alexei V.; Remillard, Ronald A.; Rest, Armin +21 more
We study the sudden optical and ultraviolet (UV) brightening of 1ES 1927+654, which until now was known as a narrow-line active galactic nucleus (AGN). 1ES 1927+654 was part of the small and peculiar class of “true Type-2” AGNs that lack broad emission lines and line-of-sight obscuration. Our high-cadence spectroscopic monitoring captures the appe…
The Hubble Space Telescope PanCET Program: Exospheric Mg II and Fe II in the Near-ultraviolet Transmission Spectrum of WASP-121b Using Jitter Decorrelation
Nikolov, Nikolay; Mikal-Evans, Thomas; Sing, David K. +18 more
We present Hubble Space Telescope (HST) near-ultraviolet (NUV) transits of the hot Jupiter WASP-121b, acquired as part of the PanCET program. Time-series spectra during two transit events were used to measure the transmission spectra between 2280 and 3070 Å at a resolution of 30,000. Using HST data from 61 Space Telescope Imaging Spectrograph visi…