485 citations · 1.2k across the 42 of their papers we have counts for
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Kilonova evolution -- the rapid emergence of spectral features
Albert Sneppen, Darach Watson, James H. Gillanders +1
Kilonovae (KNe) are one of the fastest types of optical transients known, cooling rapidly in the first few days following their neutron-star merger origin. We show here that KN spe…
Efficient survey design for finding high-redshift galaxies with JWST
Luka Vujeva, Charles L. Steinhardt, Christian Kragh Jespersen +9
Several large JWST blank field observing programs have not yet discovered the first galaxies expected to form at . This has motivated the search for more effecti…
Towards inferring the geometry of kilonovae
Christine E. Collins, Luke J. Shingles, Andreas Bauswein +11
Recent analysis of the kilonova, AT2017gfo, has indicated that this event was highly spherical. This may challenge hydrodynamics simulations of binary neutron star mergers, which u…
Discovery of a 760 nm P Cygni line in AT2017gfo: Identification of yttrium in the kilonova photosphere
Albert Sneppen, Darach Watson
Neutron star mergers are believed to be a major cosmological source of rapid neutron-capture elements. The kilonovae associated with neutron star mergers have to date yielded only…
A Value-added COSMOS2020 Catalog of Physical Properties: Constraining Temperature-dependent Initial Mass Function
Vadim Rusakov, Charles L. Steinhardt, Albert Sneppen
This work presents and releases a catalog of new photometrically-derived physical properties for the most well-measured galaxies in the COSMOS field on the sky. Using a…
Measuring the Hubble constant with kilonovae using the Expanding Photosphere Method
Albert Sneppen, Darach Watson, Dovi Poznanski +3
While gravitational wave (GW) standard sirens from neutron star (NS) mergers have been proposed to offer good measurements of the Hubble constant, we show in this paper how a varia…
On the Blackbody Spectrum of Kilonovae
Albert Sneppen
The early spectra of the kilonova AT2017gfo have a remarkably smooth blackbody continuum, which reveals information on the thermal properties and radioactive heating within the eje…
The Highest-Redshift Balmer Breaks as a Test of CDM
Charles L. Steinhardt, Albert Sneppen, Thorbjørn Clausen +3
Recent studies have reported tension between the presence of luminous, high-redshift galaxies and the halo mass functions predicted by standard cosmology. Here, an improved test is…
Spherical symmetry in the kilonova AT2017gfo/GW170817
Albert Sneppen, Darach Watson, Andreas Bauswein +5
The mergers of neutron stars expel a heavy-element enriched fireball which can be observed as a kilonova. The kilonova's geometry is a key diagnostic of the merger and is dictated…
The Earliest Stage of Galactic Star Formation
Charles L. Steinhardt, Vadim Rusakov, Thomas H. Clark +5
Using a recently-developed technique to estimate gas temperatures () in star-forming regions from large photometric surveys, we propose a diagram, analogous to the H…