Search Publications
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…
Structures, Stellar Population Properties, AGN Fractions, and Environments of Massive Compact Galaxies at 1 < z < 2 in 3D-HST/CANDELS
Fang, Guanwen; Gu, Yizhou; Yuan, Qirong +1 more
We present a study on structures and physical properties of massive (M* > 1010M⊙) compact galaxies at 1.0 < z < 2.0 in five 3D-HST/CANDELS fields. Compared with the extended star-forming galaxies (eSFGs), compact star-forming galaxies (cSFGs) are found to have the lower level of star formation, and mainly …
Herschel Observations of Disks around Late-type Stars
Gizis, John E.; Plavchan, Peter; Matrá, Luca +9 more
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 photo…
HiFLEx—A Highly Flexible Package to Reduce Cross-dispersed Echelle Spectra
Anglada-Escudé, Guillem; Sithajan, Sirinrat; Feng, Fabo +8 more
We describe a flexible data reduction package for high resolution cross-dispersed echelle data. This open-source package is developed in Python and includes optional GUIs for most of the steps. It does not require any pre-knowledge about the form or position of the echelle-orders. It has been tested on cross-dispersed echelle spectrographs between…