- Unsupervised Transient Light Curve Analysis via Hierarchical Bayesian Inference
- Sanders, N. E.; Betancourt, M.; Soderberg, A. M.
Historically, light curve studies of supernovae (SNe) and other transient classes have focused on individual objects with copious and high signal-to-noise observations. In the nascent era of wide field transient searches, objects with detailed obser …
- A Continuum of Planet Formation between 1 and 4 Earth Radii
- Schlaufman, Kevin C.
It has long been known that stars with high metallicity are more likely to host giant planets than stars with low metallicity. Yet the connection between host star metallicity and the properties of small planets is only just beginning to be investig …
- On the Occurrence Rate of Hot Jupiters in Different Stellar Environments
- Wang, Ji; Fischer, Debra A.; Horch, Elliott P.; Huang, Xu
Many hot Jupiters (HJs) are detected by the Doppler and transit techniques. From surveys using these two techniques, however, the measured HJ occurrence rates differ by a factor of two or more. Using the California Planet Survey sample and the Keple …
- A Global Model of The Light Curves and Expansion Velocities of Type II-plateau Supernovae
- Pejcha, Ondřej; Prieto, Jose L.
We present a new self-consistent and versatile method that derives photospheric radius and temperature variations of Type II-Plateau supernovae based on their expansion velocities and photometric measurements. We apply the method to a sample of 26 w …
- A Statistical Reconstruction of the Planet Population around Kepler Solar-type Stars
- Silburt, Ari; Gaidos, Eric; Wu, Yanqin
Using the cumulative catalog of planets detected by the NASA Kepler mission, we reconstruct the intrinsic occurrence of Earth- to Neptune-size (1-4 R ⊕) planets and their distributions with radius and orbital period. We analyze 76,711 solar-type ( …
- A Stellar-mass-dependent Drop in Planet Occurrence Rates
- Mulders, Gijs D.; Pascucci, Ilaria; Apai, Dániel
The Kepler spacecraft has discovered a large number of planets with up to one-year periods and down to terrestrial sizes. While the majority of the target stars are main-sequence dwarfs of spectral type F, G, and K, Kepler covers stars with effectiv …
- Doppler tomography by total variation minimization
- Uemura, Makoto; Kato, Taichi; Nogami, Daisaku; Mennickent, Ronald
We have developed a new model of Doppler tomography using total variation minimization (DTTVM). This method can reconstruct localized and nonaxisymmetric profiles with sharp edges in the Doppler map. This characteristic is emphasized in the case whe …
- Cosmic voids detection without density measurements
- Elyiv, Andrii; Marulli, Federico; Pollina, Giorgia; Baldi, Marco; Branchini, Enzo; Cimatti, Andrea; Moscardini, Lauro
Cosmic voids are effective cosmological probes to discriminate among competing world models. Their identification is generally based on density or geometry criteria that, because of their very nature, are prone to shot noise. We propose two void fin …
- Recursive Bayesian estimation of regularized and irregular quasar light curves
- Hanif, A.; Protopapas, P.
We investigate the efficacy of recursive Bayesian estimation of regularized and irregular astrophysical time series using particle filters to understand latent dynamics. We begin by regularizing a MACHO (massive compact halo object) quasar light cur …
- Clustering-based redshift estimation: comparison to spectroscopic redshifts
- Rahman, Mubdi; Ménard, Brice; Scranton, Ryan; Schmidt, Samuel J.; Morrison, Christopher B.
We investigate the potential and accuracy of clustering-based redshift estimation using the method proposed by Ménard et al. This technique enables the inference of redshift distributions from measurements of the spatial clustering of arbitrary sou …
- Unsupervised spectral decomposition of X-ray binaries with application to GX 339-4
- Koljonen, K. I. I.
In this paper, we explore unsupervised spectral decomposition methods for distinguishing the effect of different spectral components for a set of consecutive spectra from an X-ray binary. We use well-established linear methods for the decomposition, …
- Generative pulsar timing analysis
- Lentati, L.; Alexander, P.; Hobson, M. P.
A new Bayesian method for the analysis of folded pulsar timing data is presented that allows for the simultaneous evaluation of evolution in the pulse profile in either frequency or time, along with the timing model and additional stochastic process …
- ORAC-DR: A generic data reduction pipeline infrastructure
- Jenness, Tim; Economou, Frossie
ORAC-DR is a general purpose data reduction pipeline system designed to be instrument and observatory agnostic. The pipeline works with instruments as varied as infrared integral field units, imaging arrays and spectrographs, and sub-millimeter hete …
- VIDE: The Void IDentification and Examination toolkit
- Sutter, P. M.; Lavaux, G.; Hamaus, N.; Pisani, A.; Wandelt, B. D.; Warren, M.; Villaescusa-Navarro, F.; Zivick, P.; Mao, Q.; Thompson, B. B.
We present VIDE, the Void IDentification and Examination toolkit, an open-source Python/C++ code for finding cosmic voids in galaxy redshift surveys and N -body simulations, characterizing their properties, and providing a platform for more detailed …
- Estimating extragalactic Faraday rotation
- Oppermann, N.; Junklewitz, H.; Greiner, M.; Enßlin, T. A.; Akahori, T.; Carretti, E.; Gaensler, B. M.; Goobar, A.; Harvey-Smith, L.; Johnston-Hollitt, M.; Pratley, L.; Schnitzeler, D. H. F. M.; Stil, J. M.; Vacca, V.
Observations of Faraday rotation for extragalactic sources probe magnetic fields both inside and outside the Milky Way. Building on our earlier estimate of the Galactic contribution, we set out to estimate the extragalactic contributions. We discuss …
- MIARMA: A minimal-loss information method for filling gaps in time series. Application to CoRoT light curves
- Pascual-Granado, J.; Garrido, R.; Suárez, J. C.
Context. Gaps in time series cause spurious frequencies in the power spectra. In light curves of pulsating stars, this hampers identifying the theoretical oscillation modes. When these gaps are smaller than the total time span, the commonly used app …
- Genus topology and cross-correlation of BICEP2 and Planck 353 GHz B-modes: further evidence favouring gravity wave detection
- Colley, Wesley N.; Gott, J. Richard
We have analysed the genus topology of the BICEP2 B-modes and found them to be Gaussian random phase as expected if they have a cosmological origin. These BICEP2 B-modes can be produced by gravity waves in the early Universe, but question has arisen …
- Foreground removal for Square Kilometre Array observations of the epoch of reionization with the correlated component analysis
- Bonaldi, Anna; Brown, Michael L.
We apply the correlated component analysis (CCA) method on simulated data of the Square Kilometre Array, with the aim of accurately cleaning the 21-cm reionization signal from diffuse foreground contamination. The CCA has been developed for the cosm …
- Simple stellar population modelling of low S/N galaxy spectra and quasar host galaxy applications
- Mosby, G.; Tremonti, C. A.; Hooper, E. J.; Wolf, M. J.; Sheinis, A. I.; Richards, J. W.
To study the effect of supermassive black holes (SMBHs) on their host galaxies it is important to study the hosts when the SMBH is near its peak activity. A method to investigate the host galaxies of high luminosity quasars is to obtain optical spec …
- Stellar atmospheric parameter estimation using Gaussian process regression
- Bu, Yude; Pan, Jingchang
As is well known, it is necessary to derive stellar parameters from massive amounts of spectral data automatically and efficiently. However, in traditional automatic methods such as artificial neural networks (ANNs) and kernel regression (KR), it is …