K. Cook — Scifaro

Overlap Zoo Beta: A Catalogue of ~800 Occulting Pairs in the DESI Legacy Survey using Citizen Science

Overlapping galaxies, in which a foreground galaxy partially overlaps a background galaxy, offer a unique opportunity to measure dust attenuation, a key nuisance parameter in galaxy studies, empirically and in great detail by modelling the…

Astrophysics of Galaxies · Physics 2026-02-26 T. Butrum , B. Holwerda , W. C. Keel , C. Robertson , I. Castellano , S. Pandey , S. M. R. Adnan , L. C. Bills , D. Patel , K. Cook , T. Hardin , A. Palao , B. Connelly , M. Morton

Ground- and Space-Based Dust Observations of VV 191 Overlapping Galaxy Pair

The Balmer decrement (H$\alpha$/H$\beta$) provides a constraint on attenuation, the cumulative effects of dust grains in the ISM. The ratio is a reliable spectroscopic tool for deriving the dust properties of galaxies that determine many…

Astrophysics of Galaxies · Physics 2024-03-26 C. Robertson , B. Holwerda , J. Young , W. Keel , J. Berkheimer , K. Cook , C. Conselice , B. Frye , N. Grogin , A. Koekemoer , C. Nasr , D. Patel , W. Roemer , D. Smith , R. Windhorst

Galaxy And Mass Assembly: The xSAGA Galaxy Complement in Nearby Galaxy Groups

Groups of galaxies are the intermediate density environment in which much of the evolution of galaxies is thought to take place. In spectroscopic redshift surveys, one can identify these as close spatial redshift associations. However,…

Astrophysics of Galaxies · Physics 2023-11-01 B. W. Holwerda , S. Phillipps , S. Weerasooriya , M. S. Bovill , S. Brough , M. J. I. Brown , C. Robertson , K. Cook

The Simultaneous Low State Spectral Energy Distribution of 1ES 2344+514 from Radio to Very High Energies

[Abridged] Context. To construct and interpret the spectral energy distribution (SED) of BL Lacertae objects, simultaneous broad-band observations are mandatory. Aims. We present the results of a dedicated multi-wavelength study of the…

High Energy Astrophysical Phenomena · Physics 2019-08-15 MAGIC Collaboration , J. Aleksić , L. A. Antonelli , P. Antoranz , M. Asensio , M. Backes , U. Barres de Almeida , J. A. Barrio , W. Bednarek , K. Berger , E. Bernardini , A. Biland , O. Blanch , R. K. Bock , A. Boller , S. Bonnefoy , G. Bonnoli , D. Borla Tridon , T. Bretz , E. Carmona , A. Carosi , D. Carreto Fidalgo , P. Colin , E. Colombo , J. L. Contreras , J. Cortina , L. Cossio , S. Covino , P. Da Vela , F. Dazzi , A. De Angelis , G. De Caneva , B. De Lotto , C. Delgado Mendez , M. Doert , A. Domínguez , D. Dominis Prester , D. Dorner , M. Doro , D. Eisenacher , D. Elsaesser , D. Ferenc , M. V. Fonseca , L. Font , C. Fruck , R. J. García López , M. Garczarczyk , D. Garrido Terrats , M. Gaug , G. Giavitto , N. Godinović , A. González Muñoz , S. R. Gozzini , A. Hadamek , D. Hadasch , A. Herrero , J. Hose , D. Hrupec , F. Jankowski , V. Kadenius , S. Klepser , M. L. Knoetig , T. Krähenbühl , J. Krause , J. Kushida , A. La Barbera , D. Lelas , E. Leonardo , N. Lewandowska , E. Lindfors , S. Lombardi , M. López , R. López-Coto , A. López-Oramas , E. Lorenz , I. Lozano , M. Makariev , K. Mallot , G. Maneva , N. Mankuzhiyil , K. Mannheim , L. Maraschi , B. Marcote , M. Mariotti , M. Martínez , J. Masbou , D. Mazin , M. Meucci , J. M. Miranda , R. Mirzoyan , J. Moldón , A. Moralejo , P. Munar-Adrover , D. Nakajima , A. Niedzwiecki , D. Nieto , K. Nilsson , N. Nowak , R. Orito , S. Paiano , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , S. Partini , M. Persic , M. Pilia , F. Prada , P. G. Prada Moroni , E. Prandini , I. Puljak , I. Reichardt , R. Reinthal , W. Rhode , M. Ribó , J. Rico , S. Rügamer , A. Saggion , K. Saito , T. Y. Saito , M. Salvati , K. Satalecka , V. Scalzotto , V. Scapin , C. Schultz , T. Schweizer , S. N. Shore , A. Sillanpää , J. Sitarek , I. Snidaric , D. Sobczynska , F. Spanier , S. Spiro , V. Stamatescu , A. Stamerra , B. Steinke , J. Storz , S. Sun , T. Surić , L. Takalo , H. Takami , F. Tavecchio , P. Temnikov , T. Terzić , D. Tescaro , M. Teshima , O. Tibolla , D. F. Torres , T. Toyama , A. Treves , M. Uellenbeck , P. Vogler , R. M. Wagner , Q. Weitzel , F. Zandanel , R. Zanin , The MAGIC Collaboration , F. Longo , F. Lucarelli , C. Pittori , S. Vercellone , D. Bastieri , C. Sbarra , E. Angelakis , L. Fuhrmann , I. Nestoras , T. P. Krichbaum , A. Sievers , J. A. Zensus , K. A. Antonyuk , W. Baumgartner , A. Berduygin , M. Carini , K. Cook , N. Gehrels , M. Kadler , Yu. A. Kovalev , Y. Y. Kovalev , F. Krauss , H. A. Krimm , A. Lähteenmäki , M. L. Lister , W. Max-Moerbeck , M. Pasanen , A. B. Pushkarev , A. C. S. Readhead , J. L. Richards , J. Sainio , D. N. Shakhovskoy , K. V. Sokolovsky , M. Tornikoski , J. Tueller , M. Weidinger , J. Wilms

Lower bounds on photometric redshift errors from Type Ia supernovae templates

Cosmology with Type Ia supernovae heretofore has required extensive spectroscopic follow-up to establish a redshift. Though tolerable at the present discovery rate, the next generation of ground-based all-sky survey instruments will render…

Instrumentation and Methods for Astrophysics · Physics 2015-05-13 S. Asztalos , S. Nikolaev , W. de Vries , S. Olivier , K. Cook , L. Wang

A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes Are Common

We present the discovery of a Neptune-mass planet OGLE-2007-BLG-368Lb with a planet-star mass ratio of q=[9.5 +/- 2.1] x 10^{-5} via gravitational microlensing. The planetary deviation was detected in real-time thanks to the high cadence of…

Earth and Planetary Astrophysics · Physics 2012-08-27 T. Sumi , D. P. Bennett , I. A. Bond , A. Udalski , V. Batista , M. Dominik , P. Fouqué , D. Kubas , A. Gould , B. Macintosh , K. Cook , S. Dong , L. Skuljan , A. Cassan , The MOA Collaboration , : , F. Abe , C. S. Botzler , A. Fukui , K. Furusawa , J. B. Hearnshaw , Y. Itow , K. Kamiya , P. M. Kilmartin , A. Korpela , W. Lin , C. H. Ling , K. Masuda , Y. Matsubara , N. Miyake , Y. Muraki , M. Nagaya , T. Nagayama , K. Ohnishi , T. Okumura , Y. C. Perrott , N. Rattenbury , To. Saito , T. Sako , D. J. Sullivan , W. L. Sweatman , P. , P. C. M. Yock , The PLANET Collaboration , : , J. P. Beaulieu , A. Cole , Ch. Coutures , M. F. Duran , J. Greenhill , F. Jablonski , U. Marboeuf , E. Martioli , E. Pedretti , O. Pejcha , P. Rojo , M. D. Albrow , S. Brillant , M. Bode , D. M. Bramich , M. J. Burgdorf , J. A. R. Caldwell , H. Calitz , E. Corrales , S. Dieters , D. Dominis Prester , J. Donatowicz , K. Hill , M. Hoffman , K. Horne , U. G. J , N. Kains , S. Kane , J. B. Marquette , R. Martin , P. Meintjes , J. Menzies , K. R. Pollard , K. C. Sahu , C. Snodgrass , I. Steele , R. Street , Y. Tsapras , J. Wambsganss , A. Williams , M. Zub , The OGLE Collaboration , : , M. K. Szyma , M. Kubiak , G. Pietrzy , I. Soszy , O. Szewczyk , K. Ulaczyk , The microFUN Collaboration , : , W. Allen , G. W. Christie , D. L. DePoy , B. S. Gaudi , C. Han , J. Janczak , C. -U. Lee , J. McCormick , F. Mallia , B. Monard , T. Natusch , B. -G. Park , R. W. Pogge , R. Santallo

Wide-Field InfraRed Survey Telescope (WFIRST) Final Report

In December 2010, NASA created a Science Definition Team (SDT) for WFIRST, the Wide Field Infra-Red Survey Telescope, recommended by the Astro 2010 Decadal Survey as the highest priority for a large space mission. The SDT was chartered to…

Instrumentation and Methods for Astrophysics · Physics 2012-08-21 J. Green , P. Schechter , C. Baltay , R. Bean , D. Bennett , R. Brown , C. Conselice , M. Donahue , X. Fan , B. S. Gaudi , C. Hirata , J. Kalirai , T. Lauer , B. Nichol , N. Padmanabhan , S. Perlmutter , B. Rauscher , J. Rhodes , T. Roellig , D. Stern , T. Sumi , A. Tanner , Y. Wang , D. Weinberg , E. Wright , N. Gehrels , R. Sambruna , W. Traub , J. Anderson , K. Cook , P. Garnavich , L. Hillenbrand , Z. Ivezic , E. Kerins , J. Lunine , P. McDonald , M. Penny , M. Phillips , G. Rieke , A. Riess , R. van der Marel , R. K. Barry , E. Cheng , D. Content , R. Cutri , R. Goullioud , K. Grady , G. Helou , C. Jackson , J. Kruk , M. Melton , C. Peddie , N. Rioux , M. Seiffert

TeV and Multi-wavelength Observations of Mrk 421 in 2006-2008

We report on TeV gamma-ray observations of the blazar Mrk 421 (redshift of 0.031) with the VERITAS observatory and the Whipple 10m Cherenkov telescope. The excellent sensitivity of VERITAS allowed us to sample the TeV gamma-ray fluxes and…

High Energy Astrophysical Phenomena · Physics 2011-08-12 V. A. Acciari , E. Aliu , T. Arlen , T. Aune , M. Beilicke , W. Benbow , D. Boltuch , S. M. Bradbury , J. H. Buckley , V. Bugaev , K. Byrum , A. Cannon , A. Cesarini , L. Ciupik , W. Cui , R. Dickherber , C. Duke , A. Falcone , J. P. Finley , G. Finnegan , L. Fortson , A. Furniss , N. Galante , D. Gall , G. H. Gillanders , S. Godambe , J. Grube , R. Guenette , G. Gyuk , D. Hanna , J. Holder , C. M. Hui , T. B. Humensky , A. Imran , P. Kaaret , N. Karlsson , M. Kertzman , D. Kieda , A. Konopelko , H. Krawczynski , F. Krennrich , M. J. Lang , G. Maier , S. McArthur , M. McCutcheon , P. Moriarty , R. A. Ong , A. N. Otte , M. Ouellette , D. Pandel , J. S. Perkins , A. Pichel , M. Pohl , J. Quinn , K. Ragan , L. C. Reyes , P. T. Reynolds , E. Roache , H. J. Rose , A. C. Rovero , M. Schroedter , G. H. Sembroski , G. Demet Senturk , D. Steele , S. P. Swordy , M. Theiling , S. Thibadeau , A. Varlotta , V. V. Vassiliev , S. Vincent , R. G. Wagner , S. P. Wakely , J. E. Ward , T. C. Weekes , A. Weinstein , T. Weisgarber , D. A. Williams , S. Wissel , M. Wood , B. Zitzer , A. Garson , K. Lee , A. C. Sadun , M. Carini , D. Barnaby , K. Cook , J. Maune , A. Pease , S. Smith , R. Walters , A. Berdyugin , E. Lindfors , K. Nilsson , M. Pasanen , J. Sainio , A. Sillanpaa , L. O. Takalo , C. Villforth , T. Montaruli , M. Baker , A. Lahteenmaki , M. Tornikoski , T. Hovatta , E. Nieppola , H. D. Aller , M. F. Aller

Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482

Aims: We present a detailed analysis of OGLE 2004-BLG-482, a relatively high-magnification single-lens microlensing event which exhibits clear extended-source effects. These events are relatively rare, but they potentially contain unique…

Solar and Stellar Astrophysics · Physics 2011-05-24 M. Zub , A. Cassan , D. Heyrovsky , P. Fouque , H. C. Stempels , M. D. Albrow , J. -P. Beaulieu , S. Brillant , G. W. Christie , N. Kains , S. Kozlowski , D. Kubas , J. Wambsganss , V. Batista , D. P. Bennett , K. Cook , C. Coutures , S. Dieters , M. Dominik , D. Dominis Prester , J. Donatowicz , J. Greenhill , K. Horne , U. G. Jorgensen , S. R. Kane , J. -B. Marquette , R. Martin , J. Menzies , K. R. Pollard , K. C. Sahu , C. Vinter , A. Williams , A. Gould , D. L. DePoy , A. Gal-Yam , B. S. Gaudi , C. Han , Y. Lipkin , D. Maoz , E. O. Ofek , B. -G. Park , R. W. Pogge , J. McCormick , A. Udalski , M. K. Szymanski , M. Kubiak , G. Pietrzynski , I. Soszynski , O. Szewczyk , L. Wyrzykowski

Completing the Census of Exoplanets with the Microlensing Planet Finder (MPF)

The MPF mission will provide a statistical census of exoplanets with masses greater than 0.1 Earth-masses and orbital separations ranging from 0.5AU to infinity. This includes analogs to all the Solar System's planets except for Mercury, as…

Earth and Planetary Astrophysics · Physics 2010-12-22 David P. Bennett , J. Anderson , J. -P. Beaulieu , I. Bond , E. Cheng , K. Cook , S. Friedman , B. S. Gaudi , A. Gould , J. Jenkins , R. Kimble , D. Lin , J. Mather , M. Rich , K. Sahu , M. Shao , T. Sumi , D. Tenerelli , A. Udalski , P. Yock

OGLE 2004-BLG-254: a K3 III Galactic Bulge Giant spatially resolved by a single microlens

We present an analysis of OGLE 2004-BLG-254, a high-magnification and relatively short duration microlensing event in which the source star, a Bulge K3-giant, has been spatially resolved by a point-like lens. We have obtained dense…

Astrophysics · Physics 2009-11-11 A. Cassan , J. -P. Beaulieu , P. Fouque , S. Brillant , M. Dominik , J. Greenhill , D. Heyrovsky , K. Horne , U. G. Jorgensen , D. Kubas , H. C. Stempels , C. Vinter , M. D. Albrow , D. Bennett , J. A. R. Caldwell , J. J. Calitz , K. Cook , C. Coutures , D. Dominis , J. Donatowicz , K. Hill , M. Hoffman , S. Kane , J. -B. Marquette , R. Martin , P. Meintjes , J. Menzies , V. R. Miller , K. R. Pollard , K. C. Sahu , J. Wambsganss , A. Williams , A. Udalski , M. K. Szymanski , M. Kubiak , G. Pietrzynski , I. Soszynski , K. Zebrun , O. Szewczyk , L. Wyrzykowski

Echoes from Ancient Supernovae in the Large Magellanic Cloud

In principle, the light from historical supernovae could still be visible as scattered-light echoes even centuries later. However, while echoes have been discovered around some nearby extragalactic supernovae well after the explosion,…

Astrophysics · Physics 2009-11-11 A. Rest , N. B. Suntzeff , K. Olsen , J. L. Prieto , R. C. Smith , D. L. Welch , A. Becker , M. Bergmann , A. Clocchiatti , K. Cook , A. Garg , M. Huber , G. Miknaitis , D. Minniti , S. Nikolaev , C. Stubbs

The Galactic Exoplanet Survey Telescope (GEST)

The Galactic Exoplanet Survey Telescope (GEST) will observe a 2 square degree field in the Galactic bulge to search for extra-solar planets using a gravitational lensing technique. This gravitational lensing technique is the only method…

Astrophysics · Physics 2009-11-07 D. P. Bennett , J. Bally , I. Bond , E. Cheng , K. Cook , D. Deming , P. Garnavich , K. Griest , D. Jewitt , N. Kaiser , T. Lauer , J. Lunine , G. Luppino , J. Mather , D. Minniti , S. Peale , S. Rhie , J. Rhodes , J. Schneider , G. Sonneborn , R. Stevenson , C. Stubbs , D. Tenerelli , N. Woolf , P. Yock

Mass-Losing Semiregular Variable Stars in Baade's Windows

By cross-correlating the results of two recent large-scale surveys, the general properties of a well defined sample of semi-regular variable stars have been determined. ISOGAL mid-infrared photometry and MACHO lightcurves are assembled for…

Astrophysics · Physics 2009-11-06 C. Alard , J. Blommaert , C. Cesarsky , N. Epchtein , M. Felli , P. Fouque , S. Ganesh , R. Genzel , G. Gilmore , I. Glass , H. Habing , A. Omont , M. Perault , S. Price , A. Robin , M. Schultheis , G. Simon , J. van Loon , C. Alcock , R. Allsman , D. Alves , T. Axelrod , A. Becker , D. Bennett , K. Cook , A. Drake , K. Freeman , M. Geha , K. Griest , M. Lehner , S. Marshall , D. Minniti , C. Nelson , B. Peterson , P. Popowski , M. Pratt , P. Quinn , W. Sutherland , A. Tomaney , T. Vandehei , D. Welch

The Performance and Scientific Rationale for an IR Imaging Fourier Transform Spectrograph on a Large Space Telescope

We describe a concept for an imaging spectrograph for a large orbiting observatory such as NASA's proposed Next Generation Space Telescope (NGST) based on an imaging Fourier transform spectrograph (IFTS). An IFTS has several important…

Astrophysics · Physics 2009-10-30 James R. Graham , Mark Abrams , C. Bennett , J. Carr , K. Cook , A. Dey , J. Najita , E. Wishnow

Gravitational Microlensing Results from Macho

We provide a status report on our search for dark matter in our Galaxy in the form of massive compact halo objects (MACHOs), using gravitational microlensing of background stars. This search uses a very large CCD camera on the dedicated…

Astrophysics · Physics 2009-10-22 W. Sutherland , C. Alcock , R. Allsman , T. Axelrod , D. Bennett , S. Chan , K. Cook , K. Freeman , K. Griest , S. Marshall , S. Perlmutter , B. Peterson , M. Pratt , P. Quinn , A. Rodgers , C. Stubbs

Probable Gravitational Microlensing towards the Galatic Bulge

The MACHO project carries out regular photometric monitoring of millions of stars in the Magellanic Clouds and Galactic Bulge, to search for very rare gravitational microlensing events due to compact objects in the galactic halo and disk. A…

Astrophysics · Physics 2009-10-22 C. Alcock , R. Allsman , T. Axelrod , D. Bennett , S. Chan , K. Cook , K. Freeman , K. Griest , S. Marshall , S. Perlmutter , B. Peterson , M. Pratt , P. Quinn , A. Rodgers , C. Stubbs , W. Sutherland

Further empirical evidence for the non-linearity of the period-luminosity relations as seen in the Large Magellanic Cloud Cepheids

(abridged) Recent studies, using OGLE data for LMC Cepheids in the optical, strongly suggest that the period-luminosity (PL) relation for the Large Magellanic Cloud (LMC) Cepheids shows a break or non-linearity at a period of 10 days. In…

Astrophysics · Physics 2009-04-13 C. Ngeow , S. Kanbur , S. Nikolaev , J. Buonaccorsi , K. Cook , D. Welch

A Census of Exoplanets in Orbits Beyond 0.5 AU via Space-based Microlensing

A space-based gravitational microlensing exoplanet survey will provide a statistical census of exoplanets with masses greater than 0.1 Earth-masses and orbital separations ranging from 0.5AU to infinity. This includes analogs to all the…

Earth and Planetary Astrophysics · Physics 2009-02-19 David P. Bennett , J. Anderson , J. -P. Beaulieu , I. Bond , E. Cheng , K. Cook , S. Friedman , B. S. Gaudi , A. Gould , J. Jenkins , R. Kimble , D. Lin , J. Mather , M. Rich , K. Sahu , T. Sumi , D. Tenerelli , A. Udalski , P. Yock

Towards A Census of Earth-mass Exo-planets with Gravitational Microlensing

Thirteen exo-planets have been discovered using the gravitational microlensing technique (out of which 7 have been published). These planets already demonstrate that super-Earths (with mass up to ~10 Earth masses) beyond the snow line are…

Astrophysics · Physics 2008-08-04 J. P. Beaulieu , E. Kerins , S. Mao , D. Bennett , A. Cassan , S. Dieters , B. S. Gaudi , A. Gould , V. Batista , R. Bender , S. Brillant , K. Cook , C. Coutures , D. Dominis-Prester , J. Donatowicz , P. Fouqué , E. Grebel , J. Greenhill , D. Heyrovsky , K. Horne , D. Kubas , J. B. Marquette , J. Menzies , N. J. Rattenbury , I. Ribas , K. Sahu , Y. Tsapras , A. Udalski , C. Vinter