Search Publications
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, …
A Gaia Early DR3 Mock Stellar Catalog: Galactic Prior and Selection Function
Girardi, Léo; Fouesneau, Morgan; Sharma, Sanjib +7 more
We present a mock stellar catalog, matching in volume, depth and data model the content of the planned Gaia early data release 3 (Gaia EDR3). We have generated our catalog (GeDR3mock) using galaxia, a tool to sample stars from an underlying Milky Way (MW) model or from N-body data. We used an updated Besançon Galactic model together with the lates…
Multi-resolution Filtering: An Empirical Method for Isolating Faint, Extended Emission in Dragonfly Data and Other Low Resolution Images
van Dokkum, Pieter; Abraham, Roberto; Danieli, Shany +6 more
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 wi…
Ondřejov Echelle Spectrograph, Ground Based Support Facility for Exoplanet Missions
Sabotta, S.; Skarka, M.; Kabáth, P. +18 more
Fulfilling the goals of space-based exoplanetary transit surveys, like Kepler and TESS, is impossible without ground-based spectroscopic follow-up. In particular, the first-step vetting of candidates could easily necessitate several hundreds of hours of telescope time - an area where 2 m class telescopes can play a crucial role. Here, we describe …
Sixteen Open Clusters Discovered with Sample-based Clustering Search of Gaia DR2
Xu, Ye; Hao, ChaoJie; Wu, ZhenYu +2 more
Accurate astrometric parameters and photometric data in three bands for more than 1.3 billion sources (mainly stars) were made available in the recent Gaia Data Release 2, allowing us to find new open clusters in the milky Way. We propose a novel sample-based clustering search method with high spatial resolution to search for open clusters (OCs). …
A Real-time Automatic Validation System for Optical Transients Detected by GWAC
Xu, Y.; Wang, J.; Xin, L. P. +4 more
The ground-based wide-angle camera array generates millions of single frame alerts per night. After the complicated and elaborate filters by multiple methods, a couple of dozens of candidates are still needed to be confirmed by follow-up observations in real-time. In order to free scientists from the complex and high-intensity follow-up tasks, we …
Tests of Catastrophic Outlier Prediction in Empirical Photometric Redshift Estimation with Redshift Probability Distributions
Singal, J.; Jones, E.
We present results of using individual galaxies’ redshift probability information derived from a photometric redshift (photo-z) algorithm, SPIDERz, to identify potential catastrophic outliers in photometric redshift determinations. By using two test data sets comprised of COSMOS multi-band photometry spanning a wide redshift range (0 < z < 4…
Synthetic Tracking Using ZTF Deep Drilling Data Sets
Rusholme, Ben; Bellm, Eric C.; Graham, Matthew J. +15 more
The Zwicky Transit Facility (ZTF) is a powerful time domain survey telescope with a large field of view of 47 ${\deg }^{2}$ deg 2 . We apply the synthetic tracking technique to integrate a ZTF's deep drilling data set, which consists of 133 nominal 30 s exposure frames spanning about 1.5 hr, to search for slowly moving asteroids down to approximat…