Numerical simulations of stochastic inflation using importance sampling

jacks0nj/pyfpt 22 Jun 2022

We show how importance sampling can be used to reconstruct the statistics of rare cosmological fluctuations in stochastic inflation.

Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology

0
22 Jun 2022

Primordial non-Gaussianity and non-Gaussian Covariance

tsfloss/pyng 21 Jun 2022

We then consider these effects on the hydrogen bispectrum as observed from a PUMA-like 21-cm intensity mapping survey at redshifts $2<z<6$ and show that not including off-diagonal covariance over-predicts the constraining power on $f_{\rm NL}$ by up to a factor of $5$.

Cosmology and Nongalactic Astrophysics

0
21 Jun 2022

Exoplanet atmosphere retrievals in 3D using phase curve data with ARCiS: application to WASP-43b

michielmin/diffusebeta 20 Jun 2022

For the free chemistry retrievals, we retrieve abundances of H2O, CH4, CO, CO2, AlO, and NH3 as a function of phase, with many more species considered for the equilibrium chemistry retrievals.

Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics

0
20 Jun 2022

The Indian Pulsar Timing Array: First data release

ipta/dr2 18 Jun 2022

Parts of the data presented in this work are expected to be incorporated into the upcoming third data release of the International Pulsar Timing Array.

Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena

0
18 Jun 2022

The BlueTides Mock Image Catalogue: Simulated observations of high-redshift galaxies and predictions for JWST imaging surveys

madelinemarshall/bluetidesmockimagecatalogue 17 Jun 2022

We predict that the COSMOS-Web survey will detect ~1000 MUV<-20. 1 mag galaxies at 6. 5<z<7. 5, by virtue of its large survey area.

Astrophysics of Galaxies

1
17 Jun 2022

FastChem 2: An improved computer program to determine the gas-phase chemical equilibrium composition for arbitrary element distributions

exoclime/FastChem 16 Jun 2022

We present FastChem 2, a new version of the established semi-analytical thermochemical equilibrium code FastChem.

Earth and Planetary Astrophysics Solar and Stellar Astrophysics Chemical Physics

16
16 Jun 2022

Rotational Variation Allows for Narrow Age Spread in the Extended Main Sequence Turnoff of Massive Cluster NGC 1846

mlipatov/calc_cluster 16 Jun 2022

In this paper, we compute continuous probability densities in three-dimensional color, magnitude, and vsini space for individual stars in a cluster's eMSTO, based on a rotating stellar evolution model.

Solar and Stellar Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics

0
16 Jun 2022

The Frequency and Mass-Ratio Distribution of Binaries in Clusters I: Description of the method and application to M67

michaeldalbrow/cmdfitter 15 Jun 2022

We present a new method for probabilistic generative modelling of stellar colour-magnitude diagrams (CMDs) to infer the frequency of binary stars and their mass-ratio distribution.

Solar and Stellar Astrophysics Astrophysics of Galaxies

0
15 Jun 2022

CMB lensing from Planck PR4 maps

carronj/planck_pr4_lensing 15 Jun 2022

We reconstruct the Cosmic Microwave Background (CMB) lensing potential on the latest Planck CMB PR4 (NPIPE) maps, which include slightly more data than the 2018 PR3 release, and implement quadratic estimators using more optimal filtering.

Cosmology and Nongalactic Astrophysics

0
15 Jun 2022

Investigation of stellar magnetic activity using variational autoencoder based on low-resolution spectroscopic survey

xylib/vae-for-spectroscopic-survey 15 Jun 2022

We apply the variational autoencoder (VAE) to the LAMOST-K2 low-resolution spectra to detect the magnetic activity of the stars in the K2 field.

Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics

0
15 Jun 2022