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Constraints on Metastable Helium in the Atmospheres of WASP-69b and WASP-52b with Ultranarrowband Photometry
Tinyanont, Samaporn; Millar-Blanchaer, Maxwell A.; Knutson, Heather A. +7 more
Infrared observations of metastable 23S helium absorption with ground- and space-based spectroscopy are rapidly maturing, as this species is a unique probe of exoplanet atmospheres. Specifically, the transit depth in the triplet feature (with vacuum wavelengths near 1083.3 nm) can be used to constrain the temperature and mass-loss rate …
Confirmation of water emission in the dayside spectrum of the ultrahot Jupiter WASP-121b
Mikal-Evans, Thomas; Sing, David K.; Wakeford, Hannah R. +5 more
We present four new secondary eclipse observations for the ultrahot Jupiter WASP-121b acquired using the Hubble Space Telescope Wide Field Camera 3. The eclipse depth is measured to a median precision of 60 ppm across 28 spectroscopic channels spanning the 1.12- $1.64\, \mu {\rm m}$ wavelength range. This is a considerable improvement to the 90 pp…
Revealing the intermediate-mass black hole at the heart of the dwarf galaxy NGC 404 with sub-parsec resolution ALMA observations
Neumayer, Nadine; Barth, Aaron J.; Greene, Jenny E. +15 more
We estimate the mass of the intermediate-mass black hole at the heart of the dwarf elliptical galaxy NGC 404 using Atacama Large Millimetre/submillimetre Array (ALMA) observations of the molecular interstellar medium at an unprecedented linear resolution of ≈0.5 pc, in combination with existing stellar kinematic information. These ALMA observation…
Absolute V-band magnitudes and mass-to-light ratios of Galactic globular clusters
Hilker, M.; Baumgardt, H.; Sollima, A.
We have used Hubble Space Telescope and ground-based photometry to determine total V-band magnitudes and mass-to-light ratios of more than 150 Galactic globular clusters. We do this by summing up the magnitudes of their individual member stars, using colour-magnitude information, Gaia DR2 proper motions, and radial velocities to distinguish cluste…
An all-sky proper-motion map of the Sagittarius stream using Gaia DR2
Jordi, C.; Anders, F.; Helmi, A. +4 more
Aims: We aim to measure the proper motion along the Sagittarius stream, which is the missing piece in determining its full 6D phase space coordinates.
Methods: We conduct a blind search of over-densities in proper motion from the Gaia second data release in a broad region around the Sagittarius stream by applying wavelet transform techni…
Chemical Evolution in the Milky Way: Rotation-based Ages for APOGEE-Kepler Cool Dwarf Stars
van Saders, Jennifer L.; García, Rafael A.; Claytor, Zachary R. +5 more
We use models of stellar angular momentum evolution to determine ages for ∼500 stars in the APOGEE-Kepler Cool Dwarfs sample. We focus on lower-main-sequence stars, where other age-dating tools become ineffective. Our age distributions are compared to those derived from asteroseismic and giant samples and solar analogs. We are able to recover gyro…
The Magellanic Corona as the key to the formation of the Magellanic Stream.
Bland-Hawthorn, J.; Lucchini, S.; D'Onghia, E. +3 more
The dominant gaseous structure in the Galactic halo is the Magellanic Stream, an extended network of neutral and ionized filaments surrounding the Large and Small Magellanic Clouds (LMC/SMC), the two most massive satellite galaxies of the Milky Way. Recent observations indicate that the Clouds are on their first passage around our Galaxy, the Stre…
Primordial black holes and oscillating gravitational waves in slow-roll and slow-climb inflation with an intermediate noninflationary phase
Wu, Puxun; Yu, Hongwei; Fu, Chengjie
We propose a new single field inflation model in which the usual slow-roll inflation is joined to a new period of slow-climb and slow-roll inflation through a short intermediate noninflationary phase. We then show that primordial curvature perturbations can be enhanced at small scales, a sizable amount of primordial black holes (PBHs) can be produ…
Cosmological constraints from galaxy-lensing cross-correlations using BOSS galaxies with SDSS and CMB lensing
Mandelbaum, Rachel; Seljak, Uroš; Slosar, Anže +2 more
We present cosmological parameter constraints based on a joint modelling of galaxy-lensing cross-correlations and galaxy clustering measurements in the SDSS, marginalizing over small-scale modelling uncertainties using mock galaxy catalogues, without explicit modelling of galaxy bias. We show that our modelling method is robust to the impact of di…
The ALPINE-ALMA [CII] survey. Circumgalactic medium pollution and gas mixing by tidal stripping in a merging system at z ∼ 4.57
Maiolino, R.; Schaerer, D.; Béthermin, M. +25 more
We present ALMA observations of a merging system at z ∼ 4.57, observed as a part of the ALMA Large Program to INvestigate [CII] at Early times (ALPINE) survey. Combining ALMA [CII]158 µm and far-infrared continuum data with multi-wavelength ancillary data, we find that the system is composed of two massive (M⋆ ≳ 1010 M<…