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16O/18O ratio in water in the coma of comet 67P/Churyumov-Gerasimenko measured with the Rosetta/ROSINA double-focusing mass spectrometer
De Keyser, Johan; Gombosi, Tamas I.; Berthelier, Jean-Jacques +11 more
The European Space Agency spacecraft Rosetta accompanied the Jupiter-family comet 67P/Churyumov-Gerasimenko for over 2 yr along its trajectory through the inner solar system. Between 2014 and 2016, it performed almost continuous in situ measurements of the comet's gaseous atmosphere in close proximity to its nucleus. In this study, the 16
AGN feedback and multiphase gas in giant elliptical galaxies
Ruszkowski, Mateusz; Li, Yuan; Wang, Chaoran
Recent observations have found extended multiphase gas in a significant fraction of massive elliptical galaxies. We perform high-resolution three-dimensional hydrodynamical simulations of two idealized elliptical galaxies - one representing a typical galaxy characterized by initial conditions conducive to the development of thermal instability and…
Evidence for spots on hot stars suggests major revision of stellar physics
Balona, L. A.
It has long been thought that starspots are not present in the A and B stars because magnetic fields cannot be generated in stars with radiative envelopes. Space observations show that a considerable fraction of these stars varies in light with periods consistent with the expected rotation periods. Here we show that the photometric periods are the…
Multiple Rings of Millimeter Dust Emission in the HD 15115 Debris Disk
MacGregor, Meredith A.; Weinberger, Alycia J.; Nesvold, Erika R. +8 more
We present observations of the HD 15115 debris disk from the Atacama Large Millimeter/submillimeter Array (ALMA) at 1.3 mm that capture this intriguing system with the highest resolution (0.″6 or 29 au) at millimeter wavelengths to date. This new ALMA image shows evidence for two rings in the disk separated by a cleared gap. By fitting models dire…
High Gas Fraction in a CO-detected Main-sequence Galaxy at z > 3
Daddi, Emanuele; Neri, Roberto; Dannerbauer, Helmut +3 more
We report NOrthern Extended Millimetre Array (NOEMA) observations of warm molecular gas traced by CO(5 - 4) in a z∼ 3.2 gas-rich main-sequence (MS) galaxy, initially serendipitously detected in CO(3 - 2) emission in “blind” deep NOEMA observations. Our target shows a gas excitation consistent with that seen in z∼ 1.5 MS galaxies ({L}CO(…
A High-resolution Mid-infrared Survey of Water Emission from Protoplanetary Disks
Zhang, Ke; Lacy, John; Najita, Joan R. +5 more
We present the largest survey of spectrally resolved mid-infrared water emission to date, with spectra for 11 disks obtained with the Michelle and TEXES spectrographs on Gemini North. Water emission is detected in six of eight disks around classical T Tauri stars. Water emission is not detected in the transitional disks SR 24 N and SR 24 S, in spi…
High-velocity outflows in massive post-starburst galaxies at z > 1
Castellano, Marco; Koekemoer, Anton M.; Pentericci, Laura +21 more
We investigate the prevalence of galactic-scale outflows in post-starburst (PSB) galaxies at high redshift (1 < z < 1.4), using the deep optical spectra available in the UKIDSS Ultra Deep Survey (UDS). We use a sample of ∼40 spectroscopically confirmed PSBs, recently identified in the UDS field, and perform a stacking analysis in order to an…
Ruprecht 147 DANCe. I. Members, empirical isochrone, luminosity, and mass distributions
Tamura, M.; Bertin, E.; Miret-Roig, N. +10 more
Context. Ruprecht 147 is the oldest (2.5 Gyr) open cluster in the solar vicinity (< 300 pc), making it an important target for stellar evolution studies and exoplanet searches.
Aims: We aim to derive a census of members and the luminosity, mass, and spatial distributions of the cluster.
Methods: We used an astro-photometric data set i…
The COMBS survey - I. Chemical origins of metal-poor stars in the Galactic bulge
Kobayashi, Chiaki; Marino, Anna F.; Hawkins, Keith +7 more
Chemistry and kinematic studies can determine the origins of stellar population across the Milky Way. The metallicity distribution function of the bulge indicates that it comprises multiple populations, the more metal-poor end of which is particularly poorly understood. It is currently unknown if metal-poor bulge stars ([Fe/H] <-1 dex) are part…
The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs
Doyle, J. G.; Mullan, D. J.; Butler, C. J. +3 more
Empirical correlations between stellar parameters such as rotation or radius and magnetic activity diagnostics require estimates of the effective temperatures and the stellar radii. The aim of this study is to propose simple methods that can be applied to large samples of stars in order to derive estimates of the stellar parameters. Good empirical…