Now showing items 338-357 of 703

    • K2 Ultracool Dwarfs Survey – V. High superflare rates on rapidly rotating late-M dwarfs 

      Paudel, Rishi R.; Gizis, J. E.; Mullan, D. J.; Schmidt, S. J.; Burgasser, A. J.; Williams, P. K. G.; Youngblood, A.; Stassun, K G (Oxford University Press, 2019-04-04)
      We observed strong superflares (defined as flares with energy in excess of 10³³ erg) on three late-M dwarfs: 2MASS J08315742+2042213 (hereafter 2M0831+2042; M7 V), 2MASS J08371832+2050349 (hereafter 2M0837+2050; M8 V), ...
    • K2 Ultracool Dwarfs Survey. III. White Light Flares Are Ubiquitous in M6-L0 Dwarfs 

      Paudel, Rishi R.; Gizis, John E.; Mullan, D. J.; Schmidt, Sarah J.; Burgasser, Adam J.; Williams, Peter K. G.; Berger, Edo (IOP, 2018-05-04)
      We report the white light are rates for 10 ultracool dwarfs (UCDs) using Kepler K2 short cadence data. Among our sample stars, two have spectral type M6, three are M7, three are M8 and two are L0. Most of our targets ...
    • K2 Ultracool Dwarfs Survey. I. Photometry of an L Dwarf Superflare 

      Gizis, John E.; Paudel, Rishi R.; Schmidt, Sarah J.; Williams, Peter K. G.; Burgasser, Adam J. (IOP, 2017-02-17)
      We report on K2 Campaign 8 measurements of a huge white light flare on the L1 dwarf SDSSp J005406.55-003101.8 (EPIC 220186653). The source is a typical L1 dwarf at a distance of ∼ 50 pc, probably an old hydrogen-burning ...
    • K2 Ultracool Dwarfs Survey. II. The White Light Flare Rate of Young Brown Dwarfs 

      Gizis, John E.; Paudel, Rishi R.; Mullan, Dermott; Schmidt, Sarah J.; Burgasser, Adam J.; Williams, Peter K. G. (IOP, 2017-08-09)
      We use Kepler K2 Campaign 4 short-cadence (one-minute) photometry to measure white light flares in the young, moving group brown dwarfs 2MASS J03350208+2342356 (2M0335+23) and 2MASS J03552337+1133437 (2M0355+11), and ...
    • K2 Ultracool Dwarfs Survey. IV. Monster Flares Observed on the Young Brown Dwarf CFHT-BD-Tau 4 

      Paudel, Rishi R.; Gizis, John E.; Mullan, D. J.; Schmidt, Sarah J.; Burgasser, Adam J.; Williams, Peter K. G.; Berger, Edo (IOP, 2018-05-28)
      We present photometric measurements of two superflares observed on a very young brown dwarf CFHT-BD-Tau 4, observed during Campaign 13 of the Kepler K2 mission. The stronger of the two superflares brightened by a factor ...
    • A Kiloparsec-scale Internal Shock Collision in the Jet of a Nearby Radio Galaxy 

      Meyer, Eileen T.; Georganopoulos, Markos; Sparks, William B.; Perlman, Eric; Marel, Roeland P. van der; Anderson, Jay; Sohn, Sangmo Tony; Biretta, John; Norman, Colin; Chiaberge, Marco (Nature Research, 2015-05-27)
      Jets of highly energized plasma with relativistic velocities are associated with black holes ranging in mass from a few times that of the Sun to the billion-solar-mass black holes at the centres of galaxies. A popular but ...
    • Kiloparsec-scale Jets: Physics, Emission Mechanisms, and Challenges 

      Perlman, Eric S.; Meyer, Eileen; Eilek, Jean; Tchekhovskoy, Sasha; Nyland, Kristina; Agudo, Ivan; Baum, Stefi; Hardcastle, Martin; Kadler, Matthias; Labiano, Alvaro; Marshall, Herman; O’Dea, Christopher; Worrall, Diana (2019-03-08)
      Jets are a ubiquitous part of the accretion process, created in AGN, by a coupling between the magnetic field near the central black hole and inflowing material. We point out what advances can be achieved by new technologies, ...
    • The Knotty Question of the Jet of PKS B1421–490 

      Gelbord, J. M.; Marshall, H. L.; Worrall, D. M.; Birkinshaw, M.; Lovell, J. E. J.; Ojha, R.; Godfrey, L.; Schwartz, D. A.; Perlman, E. S.; Georganopoulos, M.; Murphy, D. W.; Jauncey, D. L. (IOP, 2005-10-04)
      We report the discovery of unusually strong optical and X-ray emission associated with a knot in the radio jet of PKS B1421-490. The knot is the brightest feature observed beyond the radio band, with knot/core flux ratios ...
    • The L 98-59 System: Three Transiting, Terrestrial-size Planets Orbiting a Nearby M Dwarf 

      Barclay, Thomas; Mukai, Koji; Pidhorodetska, Daria; et al. (IOP Publishing, 2019-06-27)
      We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three terrestrial-size planets transiting L 98-59 (TOI-175, TIC 307210830)—a bright M dwarf at a distance of 10.6 pc. Using the Gaia-measured distance ...
    • L 98-59: A Benchmark System of Terrestrial Planets for Future Atmospheric Characterization 

      Pidhorodetska, Daria; Moran, Sarah; Fauchez, Thomas; Kopparapu, Ravi; Colon, Knicole; Quintana, Elisa; Villanueva, Geronimo; Domagal-Goldman, Shawn (Universities Space Research Association, 2020)
    • Large-FSR Thermally Tunable Double-Ring Filters for WDM Applications in Silicon Photonics 

      Manganelli, C. L.; Pintus, P.; Gambini, Fabrizio; Fowler, D.; Fournier, M.; Faralli, S.; Kopp, C.; Oton, C. J. (IEEE, 2017-02-02)
      We present the design procedure and experimental results of thermally tunable double ring resonators for integrated wavelength division multiplexing applications. A detailed analytical model specific for double rings is ...
    • Large-scale H I in nearby radio galaxies – II. The nature of classical low-power radio sources 

      Emonts, B. H. C.; Morganti, R.; Struve, C.; Oosterloo, T. A.; Moorsel, G. van; Tadhunter, C. N.; Hulst, J. M. van der; Brogt, E.; Holt, J.; Mirabal, N. (Oxford University Press, 2010-07-19)
      An important aspect of solving the long-standing question as to what triggers various types of active galactic nuclei (AGN) involves a thorough understanding of the overall properties and formation history of their host ...
    • The Laser Interferometer Space Antenna: Unveiling the Millihertz Gravitational Wave Sky 

      Baker, John; Bellovary, Jillian; Bender, Peter L.; Berti, Emanuele; Caldwell, Robert; Camp, Jordan; Conklin, John W.; Cornish, Neil; Cutler, Curt; DeRosa, Ryan; Eracleous, Michael; Ferrara, Elizabeth C.; Francis, Samuel; Hewitson, Martin; Holley-Bockelmann, Kelly; Hornschemeier, Ann; Hogan, Craig; Kamai, Brittany; Kelly, Bernard J.; Key, Joey Shapiro; Larson, Shane L.; Livas, Jeff; Manthripragada, Sridhar; McKenzie, Kirk; McWilliams, Sean T.; Mueller, Guido; Natarajan, Priyamvada; Numata, Kenji; Rioux, Norman; Sankar, Shannon R.; Schnittman, Jeremy; Shoemaker, David; Shoemaker, Deirdre; Slutsky, Jacob; Spero, Robert; Stebbins, Robin; Thorpe, Ira; Vallisneri, Michele; Ware, Brent; Wass, Peter; Yu, Anthony; Ziemer, John (2019-07-26)
      The first terrestrial gravitational wave interferometers have dramatically underscored the scientific value of observing the Universe through an entirely different window, and of folding this new channel of information ...
    • Lightcurve Evolution of the nearest Tidal Disruption Event: A late-time, radio-only flare 

      Perlman, Eric S; Meyer, Eileen T; Wang, Q. Daniel; Yuan, Qiang; Henriksen, Richard; Irwin, Judith; Li, Jiangtao; Wiegert, Theresa; Li, Haochuan; Yang, Yang (2021-11-23)
      Tidal disruption events (TDEs) occur when a star passes close enough to a galaxy's supermassive black hole to be disrupted by tidal forces. We discuss new observations of IGRJ12580+0134, a TDE observed in NGC 4845 (d=17 ...
    • Limits on the hard X-ray emission from the periodic fast radio burst FRB 180916.J0158+65 

      Laha, Sibasish; Wadiasingh, Zorawar; Parsotan, Tyler; Lien, Amy; Younes, George; Zhang, Bing; Cenko, S. Bradley; Troja, Eleonora; Oates, Samantha; Nicholl, Matt; Meyer, Eileen; Becerra, Josefa G.; Ghosh, Ritesh; Klingler, Noel (2022-03-16)
      FRB 180916.J0158+65 is one of the nearest, periodically repeating, and actively bursting fast radio burst (FRB) which has been localized to the outskirts of a spiral galaxy. In this work we study the FRB with the hard X-ray ...
    • The lively accretion disk in NGC 2992. I. Transient iron K emission lines in the high flux state 

      Marinucci, A.; Bianchi, S.; Braito, V.; De Marco, B.; Matt, G.; Middei, R.; Nardini, E.; Reeves, J. N. (2020-06-09)
      We report on one of the brightest flux levels of the Seyfert 2 galaxy NGC 2992 ever observed in X-rays, on May 2019. The source has been monitored every few days from March 26, 2019 to December 14, 2019 by Swift-XRT, and ...
    • LOCALIZATION AND BROADBAND FOLLOW-UP OF THE GRAVITATIONAL-WAVE TRANSIENT GW150914 

      Mirabal, N.; et al. (IOP, 2016-07-20)
      A gravitational-wave (GW) transient was identified in data recorded by the Advanced Laser Interferometer Gravitational-wave Observatory (LIGO) detectors on 2015 September 14. The event, initially designated G184098 and ...
    • Looking at cosmic near-infrared background radiation anisotropies 

      Kashlinsky, A.; Arendt, Richard; Atrio-Barandela, F.; Cappelluti, N.; Ferrara, A.; Hasinger, G. (APS, 2018-06-19)
      The cosmic infrared background (CIB) contains emissions accumulated over the entire history of the Universe, including from objects inaccessible to individual telescopic studies. The near-infrared (∼1–10 μm) part of the ...
    • Lyman-tomography of Cosmic Infrared Background Fluctuations with Euclid: Probing Emissions and Baryonic Acoustic Oscillations at z ≳ 10 

      Kashlinsky, A.; Arendt, Richard; Atrio-Barandela, F.; Helgason, K. (IOP Science, 2015-10-26)
      The Euclid space mission, designed to probe evolution of the Dark Energy (DE), will map a large area of the sky at three adjacent near-IR filters, Y, J, and H. This coverage will also enable mapping source-subtracted cosmic ...
    • Machine learning applications on event reconstruction and identification for ISS-CREAM 

      Yu, Monong; Anderson, Tyler B.; Chen, Yu; Coutu, Stéphane; LaBree, Tyler; Link, Jason T.; Mitchell, John W.; Mognet, S.A. Isaac; Nutter, Scott; Sakai, Kenichi; Smith, Jacob (Proceedings of Science, 2021-07-12)
      A supervised machine learning algorithm is applied to the visual representations of the energy deposits in two orthogonal views of the calorimeter of ISS-CREAM. Convolutional Neural Networks (CNNs) backed by Tensorflow ...