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A Guide to Realistic Uncertainties on the Fundamental Properties of Solar-type Exoplanet Host Stars
van Saders, Jennifer; Huber, Daniel; Claytor, Zachary R. +1 more
Our understanding of the properties and demographics of exoplanets critically relies on our ability to determine the fundamental properties of their host stars. The advent of Gaia and large spectroscopic surveys has now made it possible, in principle, to infer the properties of individual stars, including most exoplanet hosts, to very high precisi…
Characterizing the Fast Radio Burst Host Galaxy Population and its Connection to Transients in the Local and Extragalactic Universe
Ryder, Stuart D.; Tejos, Nicolas; Day, Cherie K. +23 more
We present the localization and host galaxies of one repeating and two apparently nonrepeating fast radio bursts (FRBs). FRB 20180301A was detected and localized with the Karl G. Jansky Very Large Array to a star-forming galaxy at z = 0.3304. FRB20191228A and FRB20200906A were detected and localized by the Australian Square Kilometre Array Pathfin…
From dawn till disc: Milky Way's turbulent youth revealed by the APOGEE+Gaia data
Belokurov, Vasily; Kravtsov, Andrey
We use accurate estimates of aluminium abundance from the APOGEE Data Release 17 and Gaia Early Data Release 3 astrometry to select a highly pure sample of stars with metallicity -1.5 ≲ [Fe/H] ≲ 0.5 born in-situ in the Milky Way proper. The low-metallicity ([Fe/H] ≲ -1.3) in-situ component we dub Aurora is kinematically hot with an approximately i…
On the Stellar Populations of Galaxies at z = 9-11: The Growth of Metals and Stellar Mass at Early Times
Papovich, Casey; Finkelstein, Steven L.; Dickinson, Mark +18 more
We present a detailed stellar population analysis of 11 bright (H < 26.6) galaxies at z = 9-11 (three spectroscopically confirmed) to constrain the chemical enrichment and growth of stellar mass of early galaxies. We use the flexible Bayesian spectral energy distribution (SED) fitting code Prospector with a range of star formation histories (SF…
A time-resolved picture of our Milky Way's early formation history
Xiang, Maosheng; Rix, Hans-Walter
The formation of our Milky Way can be split up qualitatively into different phases that resulted in its structurally different stellar populations: the halo and the disk components1-3. Revealing a quantitative overall picture of our Galaxy's assembly requires a large sample of stars with very precise ages. Here we report an analysis of …
An Isolated Stellar-mass Black Hole Detected through Astrometric Microlensing
Ferguson, Henry C.; Brown, Thomas M.; Casertano, Stefano +91 more
We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). We used the Hubble Space Telescope (HST) to carry out precise astrometry of the source star of the long-duration (t E ≃ 270 days), high-magnification microlensing event MOA-2011-BLG-191/OGLE-2011-BLG-0462 (hereafter designated as …
First look with JWST spectroscopy: Resemblance among z ∼ 8 galaxies and local analogs
Schaerer, D.; Marques-Chaves, R.; Brammer, G. +5 more
Deep images and near-IR spectra of galaxies in the field of the lensing cluster SMACS J0723.3−7327 were recently taken as part of the Early Release Observations (EROs) program of the James Webb Space Telescope (JWST). Among these, two NIRSpec spectra of galaxies, at z = 7.7 and at z = 8.5, were obtained, revealing, for the first time, the rest-fra…
The Low-redshift Lyman Continuum Survey. I. New, Diverse Local Lyman Continuum Emitters
Papovich, Casey; Finkelstein, Steven L.; Santini, Paola +44 more
The origins of Lyman continuum (LyC) photons responsible for the reionization of the universe are as of yet unknown and highly contested. Detecting LyC photons from the Epoch of Reionization is not possible due to absorption by the intergalactic medium, which has prompted the development of several indirect diagnostics to infer the rate at which g…
Star formation near the Sun is driven by expansion of the Local Bubble
Alves, João; Speagle, Joshua S.; Zucker, Catherine +8 more
For decades we have known that the Sun lies within the Local Bubble, a cavity of low-density, high-temperature plasma surrounded by a shell of cold, neutral gas and dust1-3. However, the precise shape and extent of this shell4,5, the impetus and timescale for its formation6,7, and its relationship to nearby star fo…
Fast, Slow, Early, Late: Quenching Massive Galaxies at z ∼ 0.8
Barro, Guillermo; van Dokkum, Pieter; Conroy, Charlie +14 more
We investigate the stellar populations for a sample of 161 massive, mainly quiescent galaxies at <z obs> = 0.8 with deep Keck/DEIMOS rest-frame optical spectroscopy (HALO7D survey). With the fully Bayesian framework Prospector, we simultaneously fit the spectroscopic and photometric data with an advanced physical model (including …