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  • Design and Operation of the ATLAS Transient Science Server
    PASP (IF 3.982) Pub Date : 2020-06-22
    K. W. Smith, S. J. Smartt, D. R. Young, J. L. Tonry, L. Denneau, H. Flewelling, A. N. Heinze, H. J. Weiland, B. Stalder, A. Rest, C. W. Stubbs, J. P. Anderson, T.-W Chen, P. Clark, A. Do, F. Förster, M. Fulton, J. Gillanders, O. R. McBrien, D. O’Neill, S. Srivastav, and D. E. Wright

    The Asteroid Terrestrial impact Last Alert System (ATLAS) system consists of two 0.5 m Schmidt telescopes with cameras covering 29 square degrees at plate scale of 1.86 arcsec per pixel. Working in tandem, the telescopes routinely survey the whole sky visible from Hawaii (above ##IMG## [http://ej.iop.org/images/1538-3873/132/1014/085002/paspab936eieqn1.gif] {$\delta \gt -50^\circ $} ) every two nights

  • A Low Cost 4bit 16 Giga-sample-per-second Analog-to-digital Converter for Radio Astronomy
    PASP (IF 3.982) Pub Date : 2020-06-22
    Homin Jiang, Chen-Yu Yu, Mark Chen, and Miter Liu

    In this study, a 4 bit, 16 giga samples per second analog-to-digital converter (ADC) printed circuit board assembly (PCBA) was designed, manufactured, and characterized for digitizing signals from radio telescopes. For this purpose, an Adsantec ANST7123-KMA flash ADC chip was used. Because this design of chip is not followed the serial ADC JESD204 standard completely, we used a novel channel bonding

  • Simulations of ELT-GMCAO Performance for Deep Field Observations
    PASP (IF 3.982) Pub Date : 2020-06-22
    E. Portaluri, V. Viotto, R. Ragazzoni, C. Arcidiacono, M. Bergomi, M. Dima, D. Greggio, J. Farinato, and D. Magrin

    The Global-Multi Conjugated Adaptive Optics (GMCAO) approach offers an alternative way to correct an adequate scientific Field of View (FoV) using only natural guide stars (NGSs) to extremely large ground-based telescopes. Thus, even in the absence of laser guide stars, a GMCAO-equipped ELT-like telescope can achieve optimal performance in terms of Strehl Ratio (SR), retrieving impressive results in

  • Forecasting Rates of Volcanic Activity on Terrestrial Exoplanets and Implications for Cryovolcanic Activity on Extrasolar Ocean Worlds
    PASP (IF 3.982) Pub Date : 2020-06-17
    Lynnae C. Quick, Aki Roberge, Amy Barr Mlinar, and Matthew M. Hedman

    Like the planets and moons in our solar system, the surfaces of terrestrial exoplanets may be shaped by volcanic activity. The magnitudes and rates of volcanic activity on terrestrial exoplanets will be intimately linked to their sizes and internal heating rates and can either facilitate or preclude the existence of habitable environments. In order to place bounds on the potential for such activity

  • Brighter-fatter Effect in Near-infrared Detectors—III. Fourier-domain Treatment of Flat Field Correlations and Application to WFIRST
    PASP (IF 3.982) Pub Date : 2020-06-15
    Jenna K. C. Freudenburg, Jahmour J. Givans, Ami Choi, Christopher M. Hirata, Chris Bennett, Stephanie Cheung, Analia Cillis, Dave Cottingham, Robert J. Hill, Jon Mah, and Lane Meier

    Weak gravitational lensing has emerged as a leading probe of the growth of cosmic structure. However, the shear signal is very small and accurate measurement depends critically on our ability to understand how non-ideal instrumental effects affect astronomical images. The Wide-Field Infrared Survey Telescope (WFIRST) will fly a focal plane containing 18 Teledyne H4RG-10 near-infrared detector arrays

  • A Simple Method to Estimate the Refractive Index Structure Parameter () in the Atmosphere
    PASP (IF 3.982) Pub Date : 2020-06-15
    Su Wu, Changdong Su, Xiaoqing Wu, Tao Luo, and Xuebin Li

    This paper proposes a simple physics-based method for estimating the ##IMG## [http://ej.iop.org/images/1538-3873/132/1014/084501/paspab9451ieqn4.gif] {${C}_{n}^{2}$} profile in the lower atmosphere, using the Ellison scale as a measure of the outer turbulence scale. The new approach only Requires the temperature profile as an input to obtain the profile of the outer turbulence scale, followed by the

  • Herschel Observations of Disks around Late-type Stars
    PASP (IF 3.982) Pub Date : 2020-06-15
    Angelle Tanner, Peter Plavchan, Geoff Bryden, Grant Kennedy, Luca Matrá, Patrick Cronin-Coltsmann, Patrick Lowrance, Todd Henry, Basmah Riaz, John E. Gizis, Adric Riedel, and Elodie Choquet

    A set of twenty late-type (K5-M5) stars were observed with the Herschel Space Observatory at 100 and 160 microns with the goal of searching for far-infrared excesses indicative of the presence of circumstellar disks. Out of this sample, four stars (TYC 7443-1102-1, TYC 9340-437-1, GJ 784 and GJ 707) have infrared excesses above their stellar photospheres at either 100 or 160 μ m or both. At 100 microns

  • Multi-resolution Filtering: An Empirical Method for Isolating Faint, Extended Emission in Dragonfly Data and Other Low Resolution Images
    PASP (IF 3.982) Pub Date : 2020-06-10
    Pieter van Dokkum, Deborah Lokhorst, Shany Danieli, Jiaxuan Li, Allison Merritt, Roberto Abraham, Colleen Gilhuly, Johnny P. Greco, and Qing Liu

    We describe an empirical, self-contained method to isolate faint, large-scale emission in imaging data of low spatial resolution. Multi-resolution filtering (MRF) uses independent data of superior spatial resolution and point source depth to create a model for all compact and high surface brightness objects in the field. This model is convolved with an appropriate kernel and subtracted from the low

  • Absolute Magnitudes of Early-type Supergiants from uvbyβ Photometry and Parallax Data
    PASP (IF 3.982) Pub Date : 2020-06-10
    Nadia Kaltcheva, Ernst Paunzen, Michal Prišegen, Valeri Golev, and Michael Watson

    We combine Strömgren–Crawford uvbyβ photometry with Gaia-DR2 parallaxes for a sample of 880 supergiants of O-B9 spectral types to explore the potential of these data in providing physical parameters of such stars. We obtained reddening corrections and photometric absolute magnitudes via the existing uvbyβ calibrations. We calculated Gaia-based absolute magnitudes applying individual photometric reddening

  • Detection of CH+, CH and H2 Molecules in the Young Planetary Nebula IC 4997
    PASP (IF 3.982) Pub Date : 2020-06-08
    N. Kameswara Rao, David L. Lambert, Arumalla B. S. Reddy, D. A. García-Hernández, Arturo Manchado, and J. J. Díaz-Luis

    We have detected CH + and CH molecular absorption lines from the youngcompact planetary nebula IC 4997 from high resolution optical spectra. A high-resolution infra-red ( H and K bands) spectrum provides detection of H 2 emission lines among many other lines. The H 2 lines provide an excitation temperature of 2100 K which may result from UV fluorescence in the envelope or from shocks formed at the

  • Classical polarimetry with a twist: a compact, geometric approach.
    PASP (IF 3.982) Pub Date : 2019-01-01
    William B Sparks,Thomas A Germer,Rebecca M Sparks

    We present an approach to classical polarimetry that requires no moving parts, is compact and robust, and that encodes the complete polarization information on a single data frame, accomplished by replacing the rotation of components such as wave plates with position along a spatial axis. We demonstrate the concept with a polarimeter having a quarter wave plate whose fast axis direction changes with

  • Moving Object Detection Using a Parallax Shift Vector Algorithm.
    PASP (IF 3.982) Pub Date : 2018-07-07
    Peter S Gural,Paul R Otto,Edward F Tedesco

    There are various algorithms currently in use to detect asteroids from ground-based observatories, but they are generally restricted to linear or mildly curved movement of the target object across the field of view. Space based sensors in high inclination, low Earth orbits can induce significant parallax in a collected sequence of images, especially for objects at the typical distances of asteroids

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