Search Publications
AXS: A Framework for Fast Astronomical Data Processing Based on Apache Spark
Bellm, Eric C.; Golkhou, V. Zach; Jurić, Mario +5 more
We introduce AXS (Astronomy eXtensions for Spark), a scalable open-source astronomical data analysis framework built on Apache Spark, a widely used industry-standard engine for big-data processing. Building on capabilities present in Spark, AXS aims to enable querying and analyzing almost arbitrarily large astronomical catalogs using familiar Pyth…
Super Metal-rich Stars in the LAMOST Survey: A Test on Radial Migration
Tian, H.; Zhao, G.; Chen, Y. Q. +5 more
Super metal-rich stars with [Fe/H] > 0.4 are selected from LAMOST DR6, and two groups, the blue and the red, are found in the T eff versus logg diagram with a temperature gap between them. In combination with Gaia DR2, stellar positions, velocities, and orbits are calculated, and spatial distributions, kinematical properties, and orb…
CALSPEC: Wide Field Camera 3 Infrared Grism Spectrophotometry
Bohlin, Ralph C.; Deustua, Susana E.
The collections of spectral energy distributions (SEDs) in the Hubble Space Telescope (HST) CALSPEC database are augmented by 19 infrared (IR) SEDs from Wide Field Camera 3 (WFC3) IR grism spectra. Together, the two IR grisms, G102 and G141, cover the 0.8-1.7 µm range with resolutions of R = 200 and 150, respectively. These new WFC3 SEDs ove…
The Trans-Neptunian Object (84922) 2003 VS2 through Stellar Occultations
Bérard, D.; Brosch, N.; Maury, A. +50 more
We present results from three world-wide campaigns that resulted in the detections of two single-chord and one multi-chord stellar occultations by the plutino object (84922) 2003 VS2. From the single-chord occultations in 2013 and 2014 we obtained accurate astrometric positions for the object, while from the multi-chord occultation on 2…
A Near-infrared View of Nearby Galaxies: The Case of NGC 6300
Díaz, R. J.; Agüero, M. P.; Gaspar, G. +3 more
We present a near-infrared study of the Seyfert 2 galaxy NGC 6300, based on subarcsecond images and long slit spectroscopy obtained with Flamingos-2 at Gemini South. We have found that the peak of the nuclear continuum emission in the K s band and the surrounding nuclear disk are 25 pc off-center with respect to the center of symmetry…
KELT-23Ab: A Hot Jupiter Transiting a Near-solar Twin Close to the TESS and JWST Continuous Viewing Zones
Bieryla, Allyson; Latham, David W.; Quinn, Samuel N. +55 more
We announce the discovery of KELT-23Ab, a hot Jupiter transiting the relatively bright (V = 10.3) star BD+66 911 (TYC 4187-996-1), and characterize the system using follow-up photometry and spectroscopy. A global fit to the system yields host-star properties of {T}eff} =5900+/- 49 K, {M}* ={0.945}-0.054+0.060<…
Thermal Emission in the Southwest Clump of VY CMa
Humphreys, Roberta M.; Stone, Jordan; Ertel, Steve +6 more
We present high spatial resolution LBTI/NOMIC 9-12 µm images of VY CMa and its massive outflow feature, the Southwest (SW) Clump. Combined with high-resolution imaging from the Hubble Space Telescope (0.4-1 µm) and LBT/LMIRCam (1-5µm), we isolate the spectral energy distribution (SED) of the clump from the star itself. Using radi…
The 2L1S/1L2S Degeneracy for Two Microlensing Planet Candidates Discovered by the KMTNet Survey in 2017
Kim, S. -L.; Lee, C. -U.; Bennett, D. P. +49 more
We report two microlensing planet candidates discovered by the Korea Microlensing Telescope Network (KMTNet) survey in 2017. However, both events have the 2L1S/1L2S degeneracy, which is an obstacle to claiming the discovery of the planets with certainty unless the degeneracy can be resolved. For KMT-2017-BLG-0962, the degeneracy cannot be resolved…
The Giant Herbig-Haro Flow HH 212 and Associated Star Formation
Bally, John; Raga, A. C.; Geballe, T. R. +5 more
The bipolar jet HH 212 is one of the finest collimated jets known. It has up to now been detected only in near-infrared H2 emission, but here we present deep optical images that show that two of the major bow shocks are weakly detected in optical [S II] emission, as expected for a bona fide Herbig-Haro jet. We also present widefield H
Spectroscopic Orbits of Subsystems in Multiple Stars. V.
Tokovinin, Andrei
Spectroscopic orbits are determined for inner subsystems in nine stellar hierarchies (HIP 2863, 4974, 8353, 28796, 35261, 92929, 115272, 115552, and 117596). Their periods range from 2.5 to 312 days. For each system, estimates of masses, orbital inclination, and other parameters are given.