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  • Validation of the WRF Model for Estimating Precipitable Water Vapor at the Ali Observatory on the Tibetan Plateau
    PASP (IF 3.982) Pub Date : 2020-11-18
    Xuan Qian, Yongqiang Yao, Hongshuai Wang, Lei Zou, Yao Li, and Jia Yin

    In this study, we assess the validity of the Weather Research and Forecasting (WRF) numerical model for estimating precipitable water vapor (PWV) at the Ali observatory, located in the southwestern part of the Tibetan Plateau. We have run WRF in three nested domains with different horizontal resolutions, centered at the Ali observatory, and the ability of the WRF model on estimating PWV conditions

  • Seeing-limited Imaging Sky Surveys—Small versus Large Telescopes
    PASP (IF 3.982) Pub Date : 2020-11-18
    E. O. Ofek and S. Ben-Ami

    Typically large telescope construction and operation costs scale up faster than their collecting area. This slows scientific progress, making it expensive and complicated to increase telescope size. We review the argument that a metric that represents the capability of an imaging survey telescopes, and that captures a wide range of science objectives, is the telescope grasp —the amount of volume of

  • The MKID Exoplanet Camera for Subaru SCExAO
    PASP (IF 3.982) Pub Date : 2020-11-18
    Alexander B. Walter, Neelay Fruitwala, Sarah Steiger, John I. Bailey III, Nicholas Zobrist, Noah Swimmer, Isabel Lipartito, Jennifer Pearl Smith, Seth R. Meeker, Clint Bockstiegel, Gregoire Coiffard, Rupert Dodkins, Paul Szypryt, Kristina K. Davis, Miguel Daal, Bruce Bumble, Giulia Collura, Olivier Guyon, Julien Lozi, Sebastien Vievard, Nemanja Jovanovic, Frantz Martinache, Thayne Currie, and Benjamin

    We present the MKID Exoplanet Camera (MEC), a z through J band (800–1400 nm) integral field spectrograph located behind The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) at the Subaru Telescope on Maunakea that utilizes Microwave Kinetic Inductance Detectors (MKIDs) as the enabling technology for high contrast imaging. MEC is the first permanently deployed near-infrared MKID instrument and

  • Development of the MICADO Flat-field and Wavelength Calibration Unit: From Design to Prototyping
    PASP (IF 3.982) Pub Date : 2020-11-17
    Gabriele Rodeghiero, Maximilian Häberle, Jonas Sauter, Miriam Sawczuck, Jörg-Uwe Pott, Norbert Münch, José Ricardo Ramos, Vianak Naranjo, Wolfgang Kausch, Nadeen B. Sabha, Enrico Biancalani, Santiago Barboza, Peter Bizenberger, Ralf-Rainer Rohloff, Friedrich Müller, Ralph Hofferbert, Lars Mohr, Udo Neumann, Ulf Seemann, Sebastian Schäfer, Kieran Leschinski, Oliver Czoske, and Werner Laun

    We describe the evolution and the analysis of the design that led to the development of the Flat-field and wavelength Calibration Unit (FCU) for the Multi-AO Imaging CAmera for Deep Observations (MICADO) instrument. MICADO will be one of the first light instruments of the Extremely Large Telescope. The FCU challenge in terms of calibration is related to the large size of the MICADO entrance and final

  • Searching for RR Lyrae Stars by Imbalanced Learning
    PASP (IF 3.982) Pub Date : 2020-11-16
    Jingyi Zhang

    As standard candles, RR Lyrae stars are taken as distance markers and age indicators, which is helpful to estimate the distance and age of globular clusters as well as galactic and extragalactic (Local Group) locations. At the same time, as tracers, they reveal the structure, chemical and dynamic evolution of the galaxy, as well as the substructure of the halo. However, the number of RR stars is very

  • The Tsinghua University-Ma Huateng Telescopes for Survey: Overview and Performance of the System
    PASP (IF 3.982) Pub Date : 2020-10-30
    Ji-Cheng Zhang, Xiao-Feng Wang, Jun Mo, Gao-Bo Xi, Jie Lin, Xiao-Jun Jiang, Xiao-Ming Zhang, Wen-Xiong Li, Sheng-Yu Yan, Zhi-Hao Chen, Lei Hu, Xue Li, Wei-Li Lin, Han Lin, Cheng Miao, Li-Ming Rui, Han-Na Sai, Dan-Feng Xiang, and Xing-Han Zhang

    Over the past decade, time-domain astronomy in optical bands has developed rapidly with the operations of some wide-field survey facilities. However, most of these surveys are conducted with only a single band, and simultaneous color information is usually unavailable for the objects monitored during the survey. Here we present introductions to the system of Tsinghua University-Ma Huateng Telescopes

  • Research Output Between 1965 and 2019 from the Use of Telescopes at Lick Observatory
    PASP (IF 3.982) Pub Date : 2020-10-30
    Graeme H. Smith and Matthew Shetrone

    The productivity of Lick Observatory (LO) is reviewed over the years from 1965 to 2019, a 55 yr period which commences with the Shane 3 m telescope being the second-largest astronomical reflector in the world, but transitions into the era of 10 m ground-based optical telescopes. The metric of productivity used here is the annual number of refereed papers within which are presented results that are

  • The Resonance Hopping Effect in the Neptune-planet Nine System
    PASP (IF 3.982) Pub Date : 2020-10-29
    T. Khain, J. C. Becker, and F. C. Adams

    The observed physical clustering of the orbits of small bodies in the distant Kuiper Belt (TNOs) has recently prompted the prediction of an additional planet in the outer solar system. Since the initial posing of the hypothesis, the effects of Planet Nine on the dynamics of the main cluster of TNOs—the objects anti-aligned with its orbit—have been well-studied. In particular, numerical simulations

  • Evryscope-South Survey of Upper- and Pre-main Sequence Solar Neighborhood Stars
    PASP (IF 3.982) Pub Date : 2020-10-20
    Nathan W. Galliher, Jeffrey K. Ratzloff, Hank Corbett, Nicholas M. Law, Ward S. Howard, Amy L. Glazier, Alan Vasquez Soto, and Ramses Gonzalez

    Using photometric data collected by Evryscope-South, we search for nearby young variable systems on the upper main sequence (UMS) and pre-main sequence (PMS). The Evryscopes are all-sky high-cadence telescope arrays operating in the Northern and Southern hemispheres. We base our search on a Gaia-selected catalog of young neighborhood upper- and pre-main sequence stars which were chosen through both

  • Anomalies and Fluctuations of Near-surface Air Temperature at Tianhuangping (Zhejiang), China, Produced by the Longest Total Solar Eclipse of the 21st Century Under Cloudy Skies
    PASP (IF 3.982) Pub Date : 2020-10-14
    Marcos A. Peñaloza-Murillo, Michael T. Roman, and Jay M. Pasachoff

    During a total eclipse of the Sun, the solar disk blocked by the lunar disk produces an instant and strong decline of energy at the surface. This loss of energy leads to a decreasing air temperatures near the surface. Anyone under a completely clear sky, with a total solar eclipse (TSE) in progress, feels a cooling, whose minimum is reached a few minutes after totality. This drop in temperature is

  • Evidence for Radio Loud to Radio Quiet Evolution from Red and Blue Quasars
    PASP (IF 3.982) Pub Date : 2020-10-13
    David Garofalo and Katie Bishop

    Recent work on red and blue quasi-stellar objects (QSOs) has identified peculiar number distributions as a function of radio-loudness that we explore and attempt to explain from the perspective of a picture in which a subset of the population of active galaxies evolves from the radio-loud to the radio-quiet state. Because the time evolution is slowed down by an order of magnitude or more for the radio-quiet

  • Least-squares Spectral and Wavelet Analyses of V455 Andromedae Time Series: The Life After the Super-outburst
    PASP (IF 3.982) Pub Date : 2020-10-12
    Ebrahim Ghaderpour and Shahnaz Ghaderpour

    An extensive spectral analysis is performed on the light curve of dwarf nova V455 Andromedae (V455 And = HS 2331+3905) using the Least-squares WAVElet software (LSWAVE) to highlight its robustness for analyzing astronomical time series. The V455 And properties are briefly reviewed, and the recent results are compared with the results obtained herein. It is shown that the new analytical tools are superior

  • The Surface Brightness of MegaConstellation Satellite Trails on Large Telescopes
    PASP (IF 3.982) Pub Date : 2020-10-08
    Roberto Ragazzoni

    On large telescopes, the trails produced by MegaConstellation satellites will be significantly defocused due to their close proximity. As a result, their apparent surface brightness will be, under a range of conditions, almost constant during their apparent sweep across the focal plane. This paper derives a few simple relationships and evaluate the impact of such trails on operations of large optical

  • Beamed and Unbeamed Emission of γ-Ray Blazars
    PASP (IF 3.982) Pub Date : 2020-10-08
    Zhiyuan Pei, Junhui Fan, Jianghe Yang, and Denis Bastieri

    A two-component model of radio emission has been used to explain some radio observational properties of Active Galactic Nuclei (AGNs) and, in particular, of blazars. In this work, we extend the two-component idea to the γ -ray emission and assume that the total γ -ray output of blazars consists of relativistically beamed and unbeamed components. The basic idea leverages the correlation between the

  • The Faint Optical Counterparts Catalog at 19.4 < r < 22 mag from Herschel-ATLAS SDP Field
    PASP (IF 3.982) Pub Date : 2020-10-08
    Pin-Song Zhao, Yi-Nan Zhu, Man I Lam, Hong Wu, and Zhi-Min Zhou

    We carry out a spectroscopic survey with Hectospec mounted on the 6.5 m Multiple Mirror Telescope to obtain redshifts of optical counterparts of the Herschel-ATLAS sources in the science demonstration phase field. Our work concerns counterparts with a magnitude range at ##IMG## [http://ej.iop.org/images/1538-3873/132/1017/114101/paspabb766ieqn1.gif] {$19.4\lt {r}_{\mathrm{SDSS}}\lt 22$} mag. The observation

  • Extremely Low Mass-ratio Semi-detached Binaries: KIC 2719436 and KIC 4245897
    PASP (IF 3.982) Pub Date : 2020-10-04
    Jia Zhang, Sheng-Bang Qian, and Bing Lyu

    We present two semi-detached binaries with extremely low mass-ratio (<0.1). The total eclipse feature on the light curves greatly improves the reliability of the binary light analysis results. Combining the photometric and spectral data, both the relative and the absolute parameters were obtained based on two methods. The masses and radii are M 1 = 1.21 ± 0.45 M ⊙ , M 2 = 0.116 ± 0.044 M ⊙ , R 1 = 1

  • Narrow-band Signal Localization for SETI on Noisy Synthetic Spectrogram Data
    PASP (IF 3.982) Pub Date : 2020-09-29
    Bryan Brzycki, Andrew P. V. Siemion, Steve Croft, Daniel Czech, David DeBoer, Julia DeMarines, Jamie Drew, Vishal Gajjar, Howard Isaacson, Brian Lacki, Matthew Lebofsky, David H. E. MacMahon, Imke de Pater, Danny C. Price, and S. Pete Worden

    As it stands today, the search for extraterrestrial intelligence is highly dependent on our ability to detect interesting candidate signals, or technosignatures, in radio telescope observations and distinguish these from human radio frequency interference (RFI). Current signal search pipelines look for signals in spectrograms of intensity as a function of time and frequency (which can be thought of

  • First Principle Simulator of a Stochastically Varying Image Plane for Photon-counting High Contrast Applications
    PASP (IF 3.982) Pub Date : 2020-09-16
    Rupert H. Dodkins, Kristina K. Davis, Briley Lewis, Sumedh Mahashabde, Benjamin A. Mazin, Isabel A. Lipartito, Neelay Fruitwala, Kieran O’Brien, and Niranjan Thatte

    Optical and near-infrared Microwave Kinetic Inductance Detectors, or MKIDs are low-temperature detectors with inherent spectral resolution that are able to instantly register individual photons with potentially no false counts or readout noise. These properties make MKIDs transformative for exoplanet direct imaging by enabling photon-statistics-based planet-discrimination techniques as well as performing

  • FEEDBACK: a SOFIA Legacy Program to Study Stellar Feedback in Regions of Massive Star Formation
    PASP (IF 3.982) Pub Date : 2020-09-16
    N. Schneider, R. Simon, C. Guevara, C. Buchbender, R. D. Higgins, Y. Okada, J. Stutzki, R. Güsten, L. D. Anderson, J. Bally, H. Beuther, L. Bonne, S. Bontemps, E. Chambers, T. Csengeri, U. U. Graf, A. Gusdorf, K. Jacobs, M. Justen, S. Kabanovic, R. Karim, M. Luisi, K. Menten, M. Mertens, B. Mookerjea, V. Ossenkopf-Okada, C. Pabst, M. W. Pound, H. Richter, N. Reyes, O. Ricken, M. Röllig, D. Russeil

    FEEDBACK is a SOFIA (Stratospheric Observatory for Infrared Astronomy) legacy program dedicated to study the interaction of massive stars with their environment. It performs a survey of 11 galactic high mass star-forming regions in the 158 μ m (1.9 THz) line of [C ii ] and the 63 μ m (4.7 THz) line of [O i ]. We employ the 14 pixel Low Frequency Array and 7 pixel High Frequency Array upGREAT heterodyne

  • Goldstone Apple Valley Radio Telescope Monitoring Flux Density of Jupiter's Synchrotron Radiation during the Juno Mission
    PASP (IF 3.982) Pub Date : 2020-09-16
    T. Velusamy, V. Adumitroaie, J. Arballo, S. M. Levin, P. A. Ries, R. Dorcey, N. Kreuser-Jenkins, J. Leflang, D. Jauncey, and S. Horiuchi

    Goldstone Apple Valley Radio Telescope (GAVRT) is a science education partnership among NASA, the Jet Propulsion Laboratory (JPL), and the Lewis Center for Educational Research (LCER), offering unique opportunities for K-12 students and their teachers. As part of a long-term Jupiter synchrotron radiation (JSR) flux density monitoring program, LCER has been carrying out Jupiter observations with some

  • Exocomets from a Solar System Perspective
    PASP (IF 3.982) Pub Date : 2020-09-16
    Paul A. Strøm, Dennis Bodewits, Matthew M. Knight, Flavien Kiefer, Geraint H. Jones, Quentin Kral, Luca Matrà, Eva Bodman, Maria Teresa Capria, Ilsedore Cleeves, Alan Fitzsimmons, Nader Haghighipour, John H. D. Harrison, Daniela Iglesias, Mihkel Kama, Harold Linnartz, Liton Majumdar, Ernst J. W. de Mooij, Stefanie N. Milam, Cyrielle Opitom, Isabel Rebollido, Laura K. Rogers, Colin Snodgrass, Clara

    Exocomets are small bodies releasing gas and dust which orbit stars other than the Sun. Their existence was first inferred from the detection of variable absorption features in stellar spectra in the late 1980s using spectroscopy. More recently, they have been detected through photometric transits from space, and through far-IR/mm gas emission within debris disks. As (exo)comets are considered to contain

  • GWOPS: A VO-technology Driven Tool to Search for the Electromagnetic Counterpart of Gravitational Wave Event
    PASP (IF 3.982) Pub Date : 2020-09-02
    Yunfei Xu, Dong Xu, Chenzhou Cui, Dongwei Fan, Zipei Zhu, Bangyao Yu, Changhua Li, Jun Han, Linying Mi, Shanshan Li, Boliang He, Yihan Tao, Hanxi Yang, and Sisi Yang

    The search and follow-up observation of electromagnetic (EM) counterparts of gravitational waves (GW) is a current hot topic of GW cosmology. Due to the limitation of the accuracy of the GW observation facility at this stage, we can only get a rough sky-localization region for the GW event, and the typical area of the region is between 200 and 1500 square degrees. Since GW events occur in or near galaxies

  • Laboratory Demonstration of Spatial Linear Dark Field Control For Imaging Extrasolar Planets in Reflected Light
    PASP (IF 3.982) Pub Date : 2020-09-02
    Thayne Currie, Eugene Pluzhnik, Olivier Guyon, Ruslan Belikov, Kelsey Miller, Steven Bos, Jared Males, Dan Sirbu, Charlotte Bond, Richard Frazin, Tyler Groff, Brian Kern, Julien Lozi, Benjamin A. Mazin, Bijan Nemati, Barnaby Norris, Hari Subedi, and Scott Will

    Imaging planets in reflected light, a key focus of future NASA missions and extremely large telescopes, requires advanced wavefront control to maintain a deep, temporally correlated null of stellar halo—i.e., a dark hole (DH)—at just several diffraction beam widths. Using the Ames Coronagraph Experiment testbed, we present the first laboratory tests of Spatial Linear Dark Field Control (LDFC) approaching

  • SALT HRS Capabilities for Time Resolved Pulsation Analysis: A Test with the roAp Star α Circini
    PASP (IF 3.982) Pub Date : 2020-09-02
    D. L. Holdsworth and E. Brunsden

    Spectroscopy is a powerful tool for detecting variability in the rapidly oscillating Ap (roAp) stars. The technique requires short integrations times and high resolution, and so is limited to only a few telescopes and instruments. To test the capabilities of the High Resolution Spectrograph (HRS) at the Southern African Large Telescope (SALT) for the study of pulsations in roAp stars, we collected

  • A Novel Survey for Young Substellar Objects with the W-band Filter. I. Filter Design and New Discoveries in Ophiuchus and Perseus
    PASP (IF 3.982) Pub Date : 2020-09-02
    K. N. Allers and Michael C. Liu

    We present the design and implementation of a medium-band near-IR filter tailored for detecting low-mass stars and brown dwarfs from the summit of Maunakea. The W -band filter is centered at 1.45 μ m with a bandpass width of 6%, designed to measure the depth of the H 2 O water absorption prominent in objects with spectral types of M6 and later. When combined with standard J and H photometry, the W

  • Solar System Physics for Exoplanet Research
    PASP (IF 3.982) Pub Date : 2020-09-02
    J. Horner, S. R. Kane, J. P. Marshall, P. A. Dalba, T. R. Holt, J. Wood, H. E. Maynard-Casely, R. Wittenmyer, P. S. Lykawka, M. Hill, R. Salmeron, J. Bailey, T. Löhne, M. Agnew, B. D. Carter, and C. C. E. Tylor

    Over the past three decades, we have witnessed one of the great revolutions in our understanding of the cosmos—the dawn of the Exoplanet Era. Where once we knew of just one planetary system (the solar system), we now know of thousands, with new systems being announced on a weekly basis. Of the thousands of planetary systems we have found to date, however, there is only one that we can study up-close

  • Editorial
    PASP (IF 3.982) Pub Date : 2020-08-16
    Jeffrey G. Mangum

    Description unavailable

  • Detection of Radio Pulsars in Single-pulse Searches Within and Across Surveys
    PASP (IF 3.982) Pub Date : 2020-08-12
    Di Pang, Katerina Goseva-Popstojanova, and Maura McLaughlin

    Pulsar detection using machine learning is a challenging problem as it involves extreme class imbalance and strong prioritization of high Recall. This paper is focused on automatic detection of astrophysical pulses in single-pulse searches, both within and across surveys. We use the output from the first stage of our previously developed two-stage Single-Pulse Event Group IDentification approach and

  • Goldstone Apple Valley Radio Telescope Observations of 2012 Solar Eclipse: A Multi-wavelength Study of cm-λ Gyroresonance Emission from Active Regions
    PASP (IF 3.982) Pub Date : 2020-08-12
    T. Velusamy, T. B. H. Kuiper, S. M. Levin, R. Dorcey, N. Kreuser-Jenkins, and J. Leflang

    Goldstone Apple Valley Radio Telescope (GAVRT) is a science education partnership among NASA, the Jet Propulsion Laboratory, and the Lewis Center for Educational Research, offering unique opportunities for K-12 students and their teachers. The GAVRT program operates a 34 m radio telescope with a wide-band, low noise receiver, which is tunable in four independent dual-polarization bands from 3 to 14

  • Physical Properties of H ii Regions in M51 from Spectroscopic Observations
    PASP (IF 3.982) Pub Date : 2020-08-06
    Peng Wei, Hu Zou, Xu Kong, Xu Zhou, Ning Hu, Zesen Lin, Yewei Mao, Lin Lin, Zhimin Zhou, Xiang Liu, Shuguo Ma, Lu Ma, Tuhong Zhong, Fei Dang, Jiantao Sun, and Xinkui Lin

    M51 and NGC 5195 is an interacting system that can be explored in great details with ground-based telescopes. The H ii regions in M51 were observed using the 2.16 m telescope of the National Astronomical Observatories of the Chinese Academy of Sciences and the 6.5 m Multiple Mirror Telescope with spatial resolution of less than ∼100 pc. We obtain a total of 113 spectra across the galaxy and combine

  • High Efficiency Direct-drive Mount for Space Surveillance and NEO Applications
    PASP (IF 3.982) Pub Date : 2020-08-06
    B. Krysiak, D. Pazderski, S. K. Kozłowski, and K. R. Kozłowski

    The design, manufacturing and field tests of a new astronomical telescope mount are the main topics of this paper. The new robotic mount dedicated for 0.5 m class telescopes is the first mount developed, developed and produced as fully Polish concept by engineers and researchers representing the automation and robotics discipline (Poznań University of Technology) and astronomy (Nicolaus Copernicus

  • Research and Application of Data Processing Technology on LAMOST Survey Spectra
    PASP (IF 3.982) Pub Date : 2020-07-27
    Shuxin Chen

    Description unavailable

  • Characterizing the Accuracy of ALMA Linear-polarization Mosaics
    PASP (IF 3.982) Pub Date : 2020-07-27
    Charles L. H. Hull, Paulo C. Cortes, Valentin J. M. Le Gouellec, Josep M. Girart, Hiroshi Nagai, Kouichiro Nakanishi, Seiji Kameno, Edward B. Fomalont, Crystal L. Brogan, George A. Moellenbrock, Rosita Paladino, and Eric Villard

    We characterize the accuracy of linear-polarization mosaics made using the Atacama Large Millimeter/submillimeter Array (ALMA). First, we observed the bright, highly linearly polarized blazar 3C 279 at Bands 3, 5, 6, and 7 (3 mm, 1.6 mm, 1.3 mm, and 0.87 mm, respectively). At each band, we measured the blazar’s polarization on an 11 × 11 grid of evenly spaced offset pointings covering the full-width

  • Corrigendum: “An Empirical Model for Estimating Precipitable Water Vapor on the Tibetan Plateau” (2019, PASP, 131, 125001)
    PASP (IF 3.982) Pub Date : 2020-07-20
    Xuan Qian, Yongqiang Yao, Lei Zou, Hongshuai Wang, and Jia Yin

    Description unavailable

  • Mitigation of Polarization Effects in Single-mode Fiber Spectrographs
    PASP (IF 3.982) Pub Date : 2020-07-14
    Andrew J. Bechter, Eric B. Bechter, Justin R. Crepp, Ryan Ketterer, and Jonathan Crass

    The use of single-mode fibers (SMFs) to illuminate radial velocity (RV) spectrographs shows promise to achieve extremely precise Doppler measurements. Due to their small core diameter, SMFs only propagate a single spatial mode which allows for diffraction-limited optical performance while simultaneously eliminating fiber modal noise. The single spatial mode however consists of two orthogonal polarization

  • Simulations Predicting the Ability of Multi-color Simultaneous Photometry to Distinguish TESS Candidate Exoplanets from False Positives
    PASP (IF 3.982) Pub Date : 2020-07-13
    Dana R. Louie, Norio Narita, Akihiko Fukui, Enric Palle, Motohide Tamura, Nobuhiko Kusakabe, Hannu Parviainen, and Drake Deming

    The Transiting Exoplanet Survey Satellite (TESS) is currently concluding its 2 yr primary science mission searching 85% of the sky for transiting exoplanets. TESS has already discovered well over one thousand TESS objects of interest (TOIs), but these candidate exoplanets must be distinguished from astrophysical false positives using other instruments or techniques. The 3-band Multi-color Simultaneous

  • The Compact Star-forming Galaxies at 2 < z < 3 in 3D-HST/CANDELS: AGN and Non-AGN Physical Properties
    PASP (IF 3.982) Pub Date : 2020-07-12
    Shiying Lu, Yizhou Gu, Guanwen Fang, Qirong Yuan, Shuang Liu, Min Bao, and Xiaotong Guo

    We investigate the differences in the stellar population properties, the structure, and the environment between massive compact star-forming galaxies (cSFGs) with or without active galactic nucleus (AGN) at2 < z < 3 in the five 3D-Hubble Space Telescope/CANDELS fields. In a sample of 221 massive cSFGs, we constitute the most complete AGN census so far, identifying 66 AGNs by the X-ray detection, the

  • 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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