• 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

更新日期：2020-11-18
• 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

更新日期：2020-11-18
• 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

更新日期：2020-11-18
• 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

更新日期：2020-11-17
• 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

更新日期：2020-11-17
• 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

更新日期：2020-11-02
• 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

更新日期：2020-11-02
• 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

更新日期：2020-10-30
• 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

更新日期：2020-10-30
• 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

更新日期：2020-10-16
• 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

更新日期：2020-10-15
• PASP (IF 3.982) Pub Date : 2020-10-12

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

更新日期：2020-10-13
• 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

更新日期：2020-10-13
• 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

更新日期：2020-10-13
• 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

更新日期：2020-10-13
• 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

更新日期：2020-10-05
• 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

更新日期：2020-09-30
• 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

更新日期：2020-09-18
• 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

更新日期：2020-09-18
• 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

更新日期：2020-09-18
• 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

更新日期：2020-09-18
• 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

更新日期：2020-09-03
• 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

更新日期：2020-09-03
• 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

更新日期：2020-09-03
• 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

更新日期：2020-09-03
• 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

更新日期：2020-09-03
• PASP (IF 3.982) Pub Date : 2020-08-16
Jeffrey G. Mangum

Description unavailable

更新日期：2020-08-17
• 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

更新日期：2020-08-14
• 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

更新日期：2020-08-14
• 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

更新日期：2020-08-10
• 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

更新日期：2020-08-10
• PASP (IF 3.982) Pub Date : 2020-07-27
Shuxin Chen

Description unavailable

更新日期：2020-07-28
• 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

更新日期：2020-07-28
• PASP (IF 3.982) Pub Date : 2020-07-20
Xuan Qian, Yongqiang Yao, Lei Zou, Hongshuai Wang, and Jia Yin

Description unavailable

更新日期：2020-07-21
• 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

更新日期：2020-07-15
• 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

更新日期：2020-07-14
• 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

更新日期：2020-07-13
• 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

更新日期：2020-06-30
• 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

更新日期：2020-06-30
• 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

更新日期：2020-06-30
• 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

更新日期：2020-06-30
• 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

更新日期：2020-06-30
• 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

更新日期：2020-06-30
• 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

更新日期：2020-06-30
• 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

更新日期：2020-06-30
• 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

更新日期：2020-06-30
• 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

更新日期：2020-06-30
• 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

更新日期：2019-11-01
• 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

更新日期：2019-11-01
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