Skip to content. | Skip to navigation

Personal tools

Navigation

You are here: Home / Recent Papers / January - June 2013

January - June 2013

An improved quasar detection method in EROS-2 and MACHO LMC data sets

Karim Pichara, Pavlos Protopapas, Dae-Won Kim, Jean Baptiste Marquette and Patrick Tisserand

We present a new classification method for quasar identification in the EROS-2 and MACHO data sets based on a boosted version of a random forest classifier. We use a set of variability features including parameters of a continuous autoregressive mod ...
A Multivariate Fit Luminosity Function and World Model for Long Gamma-Ray Bursts

Shahmoradi, Amir

It is proposed that the luminosity function, the rest-frame spectral correlations, and distributions of cosmological long-duration (Type-II) gamma-ray bursts (LGRBs) may be very well described as a multivariate log-normal distribution. This result i ...
A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky

Lépine, Sébastien; Hilton, Eric J.; Mann, Andrew W.; Wilde, Matthew; Rojas-Ayala, Bárbara; Cruz, Kelle L.; Gaidos, Eric

We present a spectroscopic catalog of the 1564 brightest (J < 9) M dwarf candidates in the northern sky, as selected from the SUPERBLINK proper motion catalog. Observations confirm 1408 of the candidates to be late-K and M dwarfs with spectral subty ...
Properties of M31. II. A Cepheid Disk Sample Derived from the First Year of PS1 PAndromeda Data

Kodric, Mihael; Riffeser, Arno; Hopp, Ulrich; Seitz, Stella; Koppenhoefer, Johannes; Bender, Ralf; Goessl, Claus; Snigula, Jan; Lee, Chien-Hsiu; Ngeow, Chow-Choong; Chambers, K. C.; Magnier, E. A.; Price, P. A.; Burgett, W. S.; Hodapp, K. W.; Kaiser, N.; Kudritzki, R.-P.

We present a sample of Cepheid variable stars toward M31 based on the first year of regular M31 observations of the PS1 survey in the r P1 and i P1 filters. We describe the selection procedure for Cepheid variable stars from the overall variable sou ...
The GALEX Time Domain Survey. I. Selection and Classification of Over a Thousand Ultraviolet Variable Sources

The GALEX Time Domain Survey. I. Selection and Classification of Over a Thousand Ultraviolet Variable Sources

We present the selection and classification of over a thousand ultraviolet (UV) variable sources discovered in ~40 deg2 of GALEX Time Domain Survey (TDS) NUV images observed with a cadence of 2 days and a baseline of observations of ~3 years. The GA ...
Automated Unsupervised Classification of the Sloan Digital Sky Survey Stellar Spectra using k-means Clustering

Sánchez Almeida, J.; Allende Prieto, C.

Large spectroscopic surveys require automated methods of analysis. This paper explores the use of k-means clustering as a tool for automated unsupervised classification of massive stellar spectral catalogs. The classification criteria are defined by ...
The Murchison Widefield Array: The Square Kilometre Array Precursor at Low Radio Frequencies

Tingay, S. J.; Goeke, R.; Bowman, J. D.; Emrich, D.; Ord, S. M.; Mitchell, D. A.; Morales, M. F.; Booler, T.; Crosse, B.; Wayth, R. B.; Lonsdale, C. J.; Tremblay, S.; Pallot, D.; Colegate, T.; Wicenec, A.; Kudryavtseva, N.; Arcus, W.; Barnes, D.; Bernardi, G.; Briggs, F.; Burns, S.; Bunton, J. D.; Cappallo, R. J.; Corey, B. E.; Deshpande, A.; Desouza, L.; Gaensler, B. M.; Greenhill, L. J.; Hall, P. J.; Hazelton, B. J.; Herne, D.; Hewitt, J. N.; Johnston-Hollitt, M.; Kaplan, D. L.; Kasper, J. C.; Kincaid, B. B.; Koenig, R.; Kratzenberg, E.; Lynch, M. J.; Mckinley, B.; Mcwhirter, S. R.; Morgan, E.; Oberoi, D.; Pathikulangara, J.; Prabu, T.; Remillard, R. A.; Rogers, A. E. E.; Roshi, A.; Salah, J. E.; Sault, R. J.; Udaya-Shankar, N.; Schlagenhaufer, F.; Srivani, K. S.; Stevens, J.; Subrahmanyan, R.; Waterson, M.; Webster, R. L.; Whitney, A. R.; Williams, A.; Williams, C. L.; Wyithe, J. S. B.

The Murchison Widefield Array (MWA) is one of three Square Kilometre Array Precursor telescopes and is located at the Murchison Radio-astronomy Observatory in the Murchison Shire of the mid-west of Western Australia, a location chosen for its extrem ...
Holographic imaging of crowded fields: high angular resolution imaging with excellent quality at very low cost

Schödel, R.; Yelda, S.; Ghez, A.; Girard, J. H.; Labadie, L.; Rebolo, R.; Pérez-Garrido, A.; Morris, M. R.

We present a method for speckle holography that is optimized for crowded fields. Its two key features are an iterative improvement of the instantaneous point spread functions (PSFs) extracted from each speckle frame and the (optional) simultaneous u ...
Simultaneous exoplanet detection and instrument aberration retrieval in multispectral coronagraphic imaging

Ygouf, M.; Mugnier, L. M.; Mouillet, D.; Fusco, T.; Beuzit, J.-L.

Context. High-contrast imaging for the detection and characterization of exoplanets relies on the instrument's capability to block out the light of the host star. Some current post-processing methods for calibrating out the residual speckles use inf ...
The Coordinated Radio and Infrared Survey for High-mass Star Formation. II. Source Catalog

Purcell, C. R.; Hoare, M. G.; Cotton, W. D.; Lumsden, S. L.; Urquhart, J. S.; Chandler, C.; Churchwell, E. B.; Diamond, P.; Dougherty, S. M.; Fender, R. P.; Fuller, G.; Garrington, S. T.; Gledhill, T. M.; Goldsmith, P. F.; Hindson, L.; Jackson, J. M.; Kurtz, S. E.; Martí, J.; Moore, T. J. T.; Mundy, L. G.; Muxlow, T. W. B.; Oudmaijer, R. D.; Pandian, J. D.; Paredes, J. M.; Shepherd, D. S.; Smethurst, S.; Spencer, R. E.; Thompson, M. A.; Umana, G.; Zijlstra, A. A.

The CORNISH project is the highest resolution radio continuum survey of the Galactic plane to date. It is the 5 GHz radio continuum part of a series of multi-wavelength surveys that focus on the northern GLIMPSE region (10° < l < 65°), observed by ...
Coronagraphic phase diversity: performance study and laboratory demonstration

Paul, B.; Sauvage, J.-F.; Mugnier, L. M.

Context. The final performance of current and future instruments dedicated to exoplanet detection and characterization (such as SPHERE on the European Very Large Telescope, GPI on Gemini North, or future instruments on Extremely Large Telescopes) is ...
Dancing in the Dark: New Brown Dwarf Binaries from Kernel Phase Interferometry

Pope, Benjamin; Martinache, Frantz; Tuthill, Peter

This paper revisits a sample of ultracool dwarfs in the solar neighborhood previously observed with the Hubble Space Telescope's NICMOS NIC1 instrument. We have applied a novel high angular resolution data analysis technique based on the extraction ...
The scale of the problem: recovering images of reionization with Generalized Morphological Component Analysis

Chapman, Emma; Abdalla, Filipe B.; Bobin, J.; Starck, J.-L.; Harker, Geraint; Jelić, Vibor; Labropoulos, Panagiotis; Zaroubi, Saleem; Brentjens, Michiel A.; de Bruyn, A. G.; Koopmans, L. V. E.

The accurate and precise removal of 21-cm foregrounds from Epoch of Reionization (EoR) redshifted 21-cm emission data is essential if we are to gain insight into an unexplored cosmological era. We apply a non-parametric technique, Generalized Morpho ...
TPZ: photometric redshift PDFs and ancillary information by using prediction trees and random forests

Carrasco Kind, Matias; Brunner, Robert J.

With the growth of large photometric surveys, accurately estimating photometric redshifts, preferably as a probability density function (PDF), and fully understanding the implicit systematic uncertainties in this process, has become increasingly imp ...
Periodicity detection in irregularly sampled light curves by robust regression and outlier detection

Anita Monika Thieler, Michael Backes, Roland Fried, Wolfgang Rhode

An important task in astroparticle physics is the detection of periodicities in irregularly sampled time series, called light curves. Many periodogram methods for light curves may be characterized as fitting periodic models using least squares regre ...
A convergent blind deconvolution method for post-adaptive-optics astronomical imaging

M. Prato, A. La Camera, S. Bonettini, and M. Bertero

In this paper, we propose a blind deconvolution method which applies to data perturbed by Poisson noise. The objective function is a generalized Kullback–Leibler (KL) divergence, depending on both the unknown object and unknown point spread functi ...
Hints for families of GRBs improving the Hubble diagram

Vincenzo F. Cardone, Didier Fraix-Burnet

As soon as their extragalactic origins were established, the hope to make Gamma - Ray Bursts (GRBs) standardizeable candles to probe the very high - z universe has opened the search for scaling relations between redshift independent observable quant ...
Interpolating point spread function anisotropy

Gentile, M.; Courbin, F.; Meylan, G.

Planned wide-field weak lensing surveys are expected to reduce the statistical errors on the shear field to unprecedented levels. In contrast, systematic errors like those induced by the convolution with the point spread function (PSF) will not bene ...
Query driven visualization of astronomical catalogs

Buddelmeijer, Hugo; Valentijn, Edwin A.

Interactive visualization of astronomical catalogs requires novel techniques due to the huge volumes and complex structure of the data produced by existing and upcoming astronomical surveys. The creation as well as the disclosure of the catalogs can ...
Libsharp - spherical harmonic transforms revisited

Reinecke, M.; Seljebotn, D. S.

We present libsharp, a code library for spherical harmonic transforms (SHTs), which evolved from the libpsht library and addresses several of its shortcomings, such as adding MPI support for distributed memory systems and SHTs of fields with arbitra ...