Search Publications
Extended Aperture Photometry of K2 RR Lyrae stars
Skarka, Marek; Pope, Benjamin J. S.; Sódor, Ádám +6 more
The Kepler Space Telescope observed thousands of RR Lyrae stars in the K2 mission. In this paper, we present our photometric solutions using extended apertures in order to conserve the flux of the stars to the highest possible extent. With this method, we are able to avoid most of the problems that RR Lyrae light curves produced by other pipelines…
Metallic-line Stars Identified from Low-resolution Spectra of LAMOST DR5
Qin, Li; Luo, A. -Li; Hou, Wen +6 more
The Large Sky Area Multi-Object Fibre Spectroscopic Telescope data release 5 (DR5) released more than 200,000 low-resolution spectra of early-type stars with a signal-to-noise ratio > 50. The search for metallic-line (Am) stars in such a large database and a study of their statistical properties are presented in this paper. Six machine-learning…
The Massive Star-forming Regions Omnibus X-ray Catalog, Third Installment
Garmire, Gordon P.; Townsley, Leisa K.; Broos, Patrick S. +1 more
We offer to the star formation community the third installment of the Massive Star-forming Regions (MSFRs) Omnibus X-ray Catalog (MOXC3), a compilation of X-ray point sources detected in 50 archival Chandra Advanced CCD Imaging Spectrometer observations of 14 Galactic MSFRs and surrounding fields. The MOXC3 MSFRs are NGC 2264, NGC 6193, RCW 108-IR…
Identifying Young Stellar Objects in the Outer Galaxy: l = 224° Region in Canis Major
Boyer, Martha L.; Szczerba, Ryszard; Elia, Davide +14 more
We study a very young star-forming region in the outer Galaxy that is the most concentrated source of outflows in the Spitzer Space Telescope GLIMPSE360 survey. This region, dubbed CMa-l224, is located in the Canis Major OB1 association. CMa-l224 is relatively faint in the mid-infrared, but it shines brightly at the far-infrared wavelengths as rev…
PEXO: A Global Modeling Framework for Nanosecond Timing, Microarcsecond Astrometry, and µm s-1 Radial Velocities
Butler, R. Paul; Anglada-Escudé, Guillem; Feng, Fabo +4 more
The ability to make independent detections of the signatures of exoplanets with complementary telescopes and instruments brings a new potential for robust identification of exoplanets and precision characterization. We introduce PEXO, a package for Precise EXOplanetology to facilitate the efficient modeling of timing, astrometry, and radial veloci…
KELT-22Ab: A Massive, Short-Period Hot Jupiter Transiting a Near-solar Twin
Bieryla, Allyson; Latham, David W.; Berlind, Perry +53 more
We present the discovery of KELT-22Ab, a hot Jupiter from the KELT-South survey. KELT-22Ab transits the moderately bright (V ∼ 11.1) Sun-like G2V star TYC 7518-468-1. The planet has an orbital period of P =1.3866529+/- 0.0000027 days, a radius of {R}P={1.285}-0.071+0.12 {R}J, and a relatively large mass …
M-subdwarf Research. I. Identification, Modified Classification System, and Sample Construction
Qin, Li; Luo, A. -Li; Zhang, Shuo +7 more
We propose a revision of the system developed by Lépine et al. for spectroscopic M-subdwarf classification. Based on an analysis of subdwarf spectra and templates from Savcheva et al., we show that the CaH1 feature originally proposed by Gizis is important in selecting reliable cool subdwarf spectra. This index should be used in combination with t…
An Atlas of Coronal Electron Density at 5R ⊙. II. A Spherical Harmonic Method for Density Reconstruction
Morgan, Huw
This is the second of a series of three papers that present a methodology with the aim of creating a set of maps of the coronal density over a period of many years. This paper describes a method for reconstructing the coronal electron density based on spherical harmonics. By assuming a radial structure to the corona at the height of interest, line…
Swift-XRT Follow-up of Gravitational-wave Triggers in the Second Advanced LIGO/Virgo Observing Run
Troja, E.; Cenko, S. B.; Sakamoto, T. +37 more
The Neil Gehrels Swift Observatory carried out prompt searches for gravitational-wave (GW) events detected by the LIGO/Virgo Collaboration (LVC) during the second observing run (“O2”). Swift performed extensive tiling of eight LVC triggers, two of which had very low false-alarm rates (GW170814 and the epochal GW170817), indicating a high confidenc…
Exoplanets in the Antarctic Sky. II. 116 Transiting Exoplanet Candidates Found by AST3-II (CHESPA) within the Southern CVZ of TESS
Wittenmyer, Robert A.; Wang, Lifan; Yang, Ming +37 more
We report first results from the CHinese Exoplanet Searching Program from Antarctica (CHESPA)—a wide-field high-resolution photometric survey for transiting exoplanets carried out using telescopes of the AST3 (Antarctic Survey Telescopes times 3) project. There are now three telescopes (AST3-I, AST3-II, and CSTAR-II) operating at Dome A—the highes…