Search Publications
The accretion history of high-mass stars: an ArTéMiS pilot study of infrared dark clouds
Roussel, H.; Arzoumanian, D.; Könyves, V. +14 more
The mass growth of protostars is a central element to the determination of fundamental stellar population properties such as the initial mass function. Constraining the accretion history of individual protostars is therefore an important aspect of star formation research. The goal of the study presented here is to determine whether high-mass (prot…
Tidal tails of open star clusters as probes to early gas expulsion. II. Predictions for Gaia
Kroupa, Pavel; Dinnbier, František
Aims: We study the formation and evolution of the tidal tail released from a young star Pleiades-like cluster, due to expulsion of primordial gas in a realistic gravitational field of the Galaxy. The tidal tails (as well as clusters) are integrated from their embedded phase for 300 Myr. We vary star formation efficiencies (SFEs) from 33% to 1…
Impact of Planetary Mass Uncertainties on Exoplanet Atmospheric Retrievals
Waldmann, I. P.; Tinetti, G.; Changeat, Q. +1 more
In current models used to interpret exoplanet atmospheric observations, the planetary mass is treated as a prior and is measured/estimated independently with external methods, such as radial velocity or transit timing variation techniques. This approach is necessary as available spectroscopic data do not have sufficient wavelength coverage and/or …
Extending the Breakthrough Listen nearby star survey to other stellar objects in the field
Garrett, M. A.; Wlodarczyk-Sroka, B. S.; Siemion, A. P. V.
We extend the source sample recently observed by the Breakthrough Listen (BL) Initiative by including additional stars (with parallaxes measured by Gaia) that also reside within the full width at half-maximum of the Green Bank 100-m Telescope and Parkes radio telescope target fields. These stars have estimated distances as listed in the extensions…
Completing the Census of AGN in GOODS-S/HUDF: New Ultradeep Radio Imaging and Predictions for JWST
Rieke, George H.; Alberts, Stacey; Nyland, Kristina +2 more
A global understanding of active galactic nuclei (AGN) and their host galaxies hinges on completing a census of AGN activity without selection biases down to the low-luminosity regime. Toward that goal, we identify AGN within faint radio populations at cosmic noon selected from new ultradeep, high-resolution imaging from the Karl G. Jansky Very La…
ZTF J1901+5309: a 40.6-min orbital period eclipsing double white dwarf system
Kulkarni, S. R.; Duev, Dmitry A.; Riddle, Reed +17 more
The Zwicky Transient Facility has begun to discover binary systems with orbital periods that are less than 1 h. Combined with dedicated follow-up systems, which allow for high-cadence photometry of these sources, systematic confirmation and characterization of these sources are now possible. Here, we report the discovery of ZTF J190125.42+530929.5…
Highlights of exoplanetary science from Spitzer
Deming, Drake; Knutson, Heather A.
Observations of extrasolar planets were not projected to be a substantial part of the Spitzer Space Telescope's mission when it was conceived and designed. Nevertheless, Spitzer was the first facility to detect thermal emission from a hot Jupiter-sized planet, and the range of its exoplanetary investigations grew to encompass transiting planets, m…
A new model for including galactic winds in simulations of galaxy formation - I. Introducing the Physically Evolved Winds (PhEW) model
Davé, Romeel; Weinberg, David H.; Scannapieco, Evan +5 more
The propagation and evolution of cold galactic winds in galactic haloes is crucial to galaxy formation models. However, modelling of this process in hydrodynamic simulations of galaxy formation is oversimplified owing to a lack of numerical resolution and often neglects critical physical processes such as hydrodynamic instabilities and thermal con…
Elemental Abundances in M31: [Fe/H] and [α/Fe] in M31 Dwarf Galaxies Using Coadded Spectra
Gilbert, Karoline M.; Majewski, Steven R.; Beaton, Rachael L. +5 more
We present chemical abundances of red giant branch (RGB) stars in the dwarf spheroidal (dSph) satellite system of Andromeda (M31), using spectral synthesis of medium-resolution (R ∼ 6000) spectra obtained with the Keck II telescope and Deep Imaging Multi-Object Spectrometer spectrograph via the Spectroscopic and Photometric Landscape of Andromeda'…
Optical and near-infrared observations of the Fried Egg Nebula. Multiple shell ejections on a 100 yr timescale from a massive yellow hypergiant
Millour, F.; de Wit, W. -J.; Szczerba, R. +15 more
Context. The fate of a massive star during the latest stages of its evolution is highly dependent on its mass-loss rate and geometry and therefore knowing the geometry of the circumstellar material close to the star and its surroundings is crucial.
Aims: We aim to provide insight into the nature (i.e. geometry, rates) of mass-loss episodes, a…