Browsing by Subject "methods: data analysis"

Now showing items 1-15 of 15

    • A new polarization amplitude bias reduction method 
      Vidal, Matías; Leahy, J. P.; Dickinson, C. (2016)
      Polarization amplitude estimation is affected by a positive noise bias, particularly important in regions with low signal-to-noise ratio (SNR). We present a new approach to correct for this bias in the case there is ...
    • Analysis of the Bayesian Cramer-Rao lower bound in astrometry Studying the impact of prior information in ... 
      Echeverría Solis, Alex; Silva Sánchez, Jorge; Méndez Bussard, René Alejandro; Orchard Concha, Marcos (EDP Sciences, 2016)
      Context. The best precision that can be achieved to estimate the location of a stellar-like object is a topic of permanent interest in the astrometric community. Aims. We analyze bounds for the best position estimation ...
    • First light of the VLT planet finder SPHERE I. Detection and characterization of the substellar companion GJ 758 B 
      Vigan, A.; Bonnefoy, M.; Ginski, C.; Beust, H.; Galicher, R.; Janson, M.; Baudino, J.-L.; Buenzli, E.; Hagelberg, J.; D’Orazi, V.; Desidera, S.; Maire, Anne-Lise; Gratton, R.; Sauvage, Jean Francois; Chauvin, G.; Thalmann, C.; Malo, L.; Salter, G.; Zurlo, A.; Antichi, J.; Baru olo, A.; Baudoz, P.; Blanchard, P.; Boccaletti, A.; Beuzit, J.-L.; Carle, M.; Claudi, R.; Costille, A.; Delboulbé, A.; Dohlen, K.; Feldt, M.; Fusco, T.; Gluck, L.; Girard, J.; Giro, E.; Gry, C.; Henning, Thomas; Hubin, N.; Hugot, E.; Jaquet, M.; Kasper, M.; Lagrange, Anne Marie; Langlois, M.; Le Mignant, D.; Llored, M.; Madec, F.; Martinez, P.; Mawet, D.; Mesa, D.; Milli, J.; Mouillet, D.; Moulin, T.; Moutou, C.; Origné, A.; Pavlov, A.; Perret, D.; Petit, C.; Pragt, J.; Puget, P.; Rabou, P.; Rochat, S.; Roelfsema, R.; Salasnich, B.; Schmid, H.-M.; Sevin, A.; Siebenmorgen, R.; Smette, A.; Stadler, E.; Suarez, M.; Turatto, M.; Udry, S.; Vakili, F.; Wahhaj, Z.; Weber, L.; Wildi, F. (ESO, 2016)
      GJ 758 B is a brown dwarf companion to a nearby (15.76%) solar-type, metal-rich (M/H = +0.2 dex) main-sequence star (G9V) that was discovered with Subaru/HiCIAO in 2009. From previous studies, it has drawn attention as ...
    • First light of the VLT planet finder SPHERE III. New spectrophotometry and astrometry of the HR 8799 ... 
      Zurlo, A.; Vigan, A.; Galicher, R.; Maire, Anne-Lise; Mesa, D.; Gratton, R.; Chauvin, G.; Kasper, M.; Moutou, C.; Bonnefoy, M.; Desidera, S.; Abe, L.; Apai, D.; Baruffolo, A.; Baudoz, P.; Baudrand, J.; Beuzit, J. -L.; Blancard, P.; Boccaletti, A.; Cantalloube, F.; Carle, M.; Cascone, E.; Charton, J.; Claudi, R. U.; Costille, A.; Caprio, V. de; Dohlen, K.; Dominik, C.; Fantinel, D.; Feautrier, P.; Feldt, M.; Fusco, T.; Gigan, P.; Girard, J. H.; Gisler, D.; Gluck, L.; Gry, C.; Henning, Thomas; Hugot, E.; Janson, M.; Jaquet, M.; Lagrange, Anne Marie; Langlois, M.; Llored, M.; Madec, F.; Magnard, Y.; Martinez, P.; Maurel, D.; Mawet, D.; Meyer, M. R.; Milli, J.; Moeller-Nilsson, O.; Mouillet, D.; Origne, A.; Pavlov, A.; Petit, C.; Puget, P.; Quanz, S. P.; Rabou, P.; Ramos, J.; Rousset, G.; Roux, A.; Salasnich, B.; Salter, G.; Sauvage, Jean Francois; Schmid, H. M.; Soenke, C.; Stadler, E.; Suarez, M.; Turatto, M.; Udry, S.; Vakili, F.; Wahhaj, Z.; Wildi, F.; Antichi, J. (EDP Sciences S.A., 2016-03)
      Context. The planetary system discovered around the young A-type HR8799 provides a unique laboratory to: a) test planet formation theories; b) probe the diversity of system architectures at these separations, and c) perform ...
    • General two-dimensional least-squares image subtraction 
      Quinn, J. L.; Clocchiatti, A.; Hamuy Wackenhut, Mario (2010)
      A very general two-dimensional solution to the image convolution problem is presented extending the least-squares approach of Bramich. Image convolution is of wide applicability in astronomical data reduction including, ...
    • Improved signal detection algorithms for unevenly sampled data. Six signals in the radial velocity data for GJ876 
      Jenkins, James Stewart; Becerra Yoma, Néstor; Rojo Rubke, Patricio; Mahu, R.; Wuth Sepúlveda, Jorge Iván. (Montlhy Notices of The Royal Society Astronomy, 2014-04-04)
      The hunt for Earth analogue planets orbiting Sun-like stars has forced the introduction of novel methods to detect signals at, or below, the level of the intrinsic noise of the observations. We present a new global ...
    • A novel, fully automated pipeline for period estimation in the EROS 2 data set 
      Protopapas, Pavlos; Huijse Heise, Pablo Andrés; Estévez Valencia, Pablo; Zegers, Pablo; Principe, José; Marquette, Jean Baptiste (IOP Publishing, 2015)
      We present a new method to discriminate periodic from nonperiodic irregularly sampled light curves. We introduce a periodic kernel and maximize a similarity measure derived from information theory to estimate the periods ...
    • NPARSEC: NTT Parallaxes of Southern Extremely Cool objects. Goals, targets, procedures and first results 
      Smart, R. L.; Tinney, C. G.; Bucciarelli, B.; Marocco, F.; Abbas, U.; Andrei, A.; Bernardi, G.; Burningham, B.; Cardoso, C.; Costa Hechenleitner, Edgardo; Crosta, M. T.; Daprá, A.; Day Jones, A.; Goldman, B.; Jones, H. R.; Lattanzi, M. G.; Leggett, S. K.; Lucas, P.; Méndez Bussard, René Alejandro; Penna, J. L.; Pinfield, D.; Smith, L.; Sozzetti, A.; Vecchiato, A. (Oxford University Press on behalf of the Royal Astronomical Society, 2013)
      The discovery and subsequent detailed study of T dwarfs have provided many surprises and pushed the physics and modelling of cool atmospheres in unpredicted directions. Distance is a critical parameter for studies of ...
    • Pipe3D, a pipeline to analyse integral field spectroscopy data: II. Analysis sequence and califa dataproducts 
      Sánchez, S. F.; Pérez, E.; Sánchez Blázquez, P.; García Benito, R.; Ibarra-Mede, H. J.; González, J.J.; Rosales Ortega, F.; Sánchez Menguiano, L.; Ascasibar, Y.; Bitsakis, T.; Law, D.; Cano-Díaz, M.; López-Cobá, C.; Marino, R.A.; Gil de Paz, A.; López Sánchez, Ángel R.; Barrera Ballesteros, J. K.; Galbany, Lluis; Mast, D.; Abril-Melgarejo, V.; Roman-Lopes, A. (Universidad Nacional Autónoma de México, 2016-04)
      We present PIPE3D, an analysis pipeline based on the FIT3D fitting tool, developed to explore the properties of the stellar populations and ionized gas of integral field spectroscopy (IFS) data. PIPE3D was created to provide ...
    • SOLAR WIND MAGNETIC FLUCTUATIONS and ELECTRON NON-THERMAL TEMPERATURE ANISOTROPY: SURVEY of WIND-SWE-VEIS ... 
      Adrian, M. L.; Viñas, A. F.; Moya, P. S.; Wendel, D. E. (Institute of Physics Publishing, 2016)
      © 2016. The American Astronomical Society. All rights reserved. The solar wind electron velocity distribution function (eVDF) exhibits a variety of non-thermal features that deviate from thermal equilibrium. These deviations ...
    • The ALMA early science view of FUor/EXor objects – I. Through the looking-glass of V2775 Ori 
      Zurlo, Alice; Cieza, Lucas; Williams, Jonathan; Canovas, Hector; Pérez González, Sebastián; Hales, Antonio; Muzic, Koraljka; Principe, David; Ruíz-Rodríguez, Dary; Tobin, John; Zhu, Zhaohuan; Casassus Montero, Simón; Aliste Prieto, José (Royal Astronomical Society, 2017)
      As part of an Atacama Large Millimeter/submillimiter Array (ALMA) survey to study the origin of episodic accretion in young eruptive variables, we have observed the circum-stellar environment of the star V2775 Ori. This ...
    • The high cadence transient survey (HITS). I. survey design and supernova shock breakout constraints 
      Foster Buron, Francisco; Maureira, Juan carlos; San Martín, J.; Hamuy Wackenhut, Mario; Martínez Palomera, Jorge; Huijse Heise, Pablo; Cabrera, Guillermo; Galbany, Lluis; De Jaeger, Thomas; González Gaitán, Santiago; Anderson, J. P.; Kunkarayakti, H.; Pignata Libralato, Giuliano; Bufano, F.; Littín, J.; Olivares, F.; Medina, G.; Smith, R. C.; Vivas, A. K.; Estévez, P. A.; Muñoz Vidal, Ricardo Rodrigo; Vera, E. (The American Astronomical Society, 2016-12-01)
      We present the first results of the High Cadence Transient Survey (HiTS), a survey for which the objective is to detect and follow-up optical transients with characteristic timescales from hours to days, especially the ...
    • TraMoS project – III. Improved physical parameters, timing analysis and starspot modelling of theWASP-4b ... 
      Hoyer, S.; López Morales, M.; Rojo, P.; Nascimbeni, V.; Hidalgo, S.; Astudillo Defru, N.; Concha, F.; Contreras, Y.; Servajean, E.; Hinse, T. C. (Oxford University Press on behalf of the Royal Astronomical Society, 2013)
      We report 12 new transit observations of the exoplanetWASP-4b from the Transit Monitoring in the South (TraMoS) project. These transits are combined with all previously published transit data for this planet to provide ...
    • Using the local gas-phase oxygen abundances to explore a metallicity dependence in SNe Ia luminosities 
      Moreno Raya, M. E.; López Sánchez, Ángel R.; Molla, M.; Galbany, Lluis (2016)
      We present an analysis of the gas-phase oxygen abundances of a sample of 28 galaxies in the local Universe (z < 0.02) hosting Type Ia supernovae (SNe Ia). The data were obtained with the 4.2 m William Herschel Telescope. ...
    • VISION - Vienna survey in Orion I. VISTA Orion A Survey 
      Meingast, Stefan; Alves, João; Mardones Pérez, Diego; Teixeira, Paula Stella; Lombardi, Marco; Großschedl, Josefa; Ascenso, Joana; Bouy, Herve; Forbrich, Jan; Goodman, Alyssa; Hacar, Alvaro; Hasenberger, Birgit; Kainulainen, Jouni; Kubiak, Karolina; Lada, Charles; Lada, Elizabeth; Moitinho, André; Petr-Gotzens, Monika; Rodrigues, Lara; Román-Zúñiga, Carlos G. (ESO, 2016-03)
      Context. Orion A hosts the nearest massive star factory, thus offering a unique opportunity to resolve the processes connected with the formation of both low- and high-mass stars. Here we present the most detailed and ...