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The First Photometric Investigation and Spectroscopic Analysis of Two Contact Binaries: ASAS J124343+1531.7 and LINEAR 2323566
Li, Kai; Michel, Raul; Xia, Qiqi +1 more
The multi-color passband CCD light curves of ASAS J124343+1531.7 and LINEAR 2323566 were first obtained by the 0.84 m Ritchey-Chrétien telescope with follow up observations by the WIYN 0.90 m Cassegrain telescope. The data from the Transiting Exoplanet Survey Satellite of ASAS J124343+1531.7 was also applied for subsequent analysis. By analyzing t…
Simulating Photometric Images of Moving Targets with Photon-mapping
Chen, Xu; Hu, Shaoming; Du, Junju +2 more
We present a novel, easy-to-use method based on the photon-mapping technique to simulate photometric images of moving targets. Realistic images can be created in two passes: photon tracing and image rendering. The nature of light sources, tracking mode of the telescope, point-spread function, and specifications of the CCD are taken into account in…
A Morphological Classification Model to Identify Unresolved PanSTARRS1 Sources. II. Update to the PS1 Point Source Catalog
Miller, A. A.; Hall, X. J.
We present an update to the PanSTARRS-1 Point Source Catalog (PS1 PSC), which provides morphological classifications of PS1 sources. The original PS1 PSC adopted stringent detection criteria that excluded hundreds of millions of PS1 sources from the PSC. Here, we adapt the supervised machine learning methods used to create the PS1 PSC and apply th…
Interstellar Extinction and Polarization of Stars in the Open Cluster NGC 7160
Topasna, G. A.; Riley, R. W.; Kaltcheva, N. T.
We present polarimetric observations of stars in the field of the open cluster NGC 7160. The multi-wavelength UBVRI polarization measurements of 21 stars that we performed indicate that some of the observed stars follow the typical wavelength dependence indicative of polarization by selective extinction in the interstellar medium, while others dis…
Trigonometric Parallaxes of Two T Dwarfs With Keck and ShaneAO Astrometry
Lu, Jessica R.; Ammons, S. Mark; Nguyen, Jayke +4 more
We present trigonometric parallax and proper motion measurements for two T-type brown dwarfs. We derive our measurements from infrared laser guide star adaptive optics observations spanning five years from the ShaneAO/SHARCS and NIRC2/medium-cam instruments on the Shane and Keck telescopes, respectively. To improve our astrometric precision, we me…
Infrared Emission Properties of Active Galactic Nuclei from Swift-BAT Hard X-Ray Survey
Yang, Xiao-Hong
The Swift/Burst Alert Telescope (BAT) 105-month survey detected 1632 hard X-ray sources in the 14-195 keV band, which includes 1105 active galactic nuclei (AGNs) that are unbiased against Compton-thin obscuration. We use a series of two-color diagrams to analyze the near, mid (MIR), and far-infrared properties of the Swift/BAT AGNs, based on data …
Lost in Space? Relativistic Interstellar Navigation using an Astrometric Star Catalog
Bailer-Jones, Coryn A. L.
The exploration of interstellar space will require autonomous navigation systems that do not rely on tracking from the Earth. Here I develop a method to determine the 3D position and 3D velocity of a spacecraft in deep space using a star catalog. As a spacecraft moves away from the Sun, the observed positions and velocities of the stars will chang…
Design and Operation of the ATLAS Transient Science Server
Rest, A.; Smartt, S. J.; Stalder, B. +19 more
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 $\delta \gt -50^\circ $ ) every two nights, exposing four times per ni…
Palomar Gattini-IR: Survey Overview, Data Processing System, On-sky Performance and First Results
Soria, Roberto; Burdge, Kevin B.; De, Kishalay +24 more
Palomar Gattini-IR is a new wide-field, near-infrared (NIR) robotic time domain survey operating at Palomar Observatory. Using a 30 cm telescope mounted with a H2RG detector, Gattini-IR achieves a field of view (FOV) of 25 sq. deg. with a pixel scale of 8.″7 in J-band. Here, we describe the system design, survey operations, data processing system …
Solar System Physics for Exoplanet Research
Löhne, T.; Marshall, J. P.; Dalba, P. A. +13 more
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, …