Search Publications
K2 Targets Observed with SPHERE/VLT: An M4-7 Dwarf Companion Resolved around EPIC 206011496
Gratton, Raffaele; Vigan, Arthur; Bonavita, Mariangela +6 more
The quest to discover exoplanets is one of the most important missions in astrophysics, and is widely performed using the transit method, which allows for the detection of exoplanets down to the size of Mercury. However, to confirm these detections, additional vetting is mandatory. We selected six K2 targets from campaigns #1 to #8 that show trans…
Gemini, SOFIA, and ATCA Reveal Very Young, Massive Protostars in the Collapsing Molecular Cloud BYF 73
Ryder, Stuart D.; Li, Dan; Pitts, Rebecca L. +1 more
We present multi-wavelength data on the globally infalling molecular cloud/protostellar cluster BYF 73. These include new far-infrared (FIR) spectral line and continuum data from the Stratospheric Observatory for Infrared Astronomy’s (SOFIA’s) Far Infrared Field-Imaging Line Spectrometer (FIFI-LS), mid-infrared (MIR) observations with the Thermal-…
Estimation of error on the cross-correlation, phase and time lag between evenly sampled light curves
Misra, R.; Dewangan, G.; Bora, A.
Temporal analysis of radiation from Astrophysical sources like Active Galactic Nuclei, X-ray Binaries and Gamma-ray bursts provides information on the geometry and sizes of the emitting regions. Establishing that two light-curves in different energy bands are correlated, and measuring the phase and time-lag between them is an important and frequen…
Young and Eccentric: The Quadruple System HD 86588
Law, Nicholas M.; Walter, Frederick M.; Tokovinin, Andrei +5 more
High-resolution spectroscopy and speckle interferometry reveal the young star HD 86588 as a quadruple system with a three-tier hierarchy. The 0.″3 resolved binary A,B with an estimated period around 300 years contains the 8-yr pair Aa,Abc (also potentially resolvable), where Ab,Ac is a double-lined binary with equal components, for which we comput…
Spectroscopic Orbits for Late-type Stars. II
Abt, Helmut A.; Fekel, Francis C.; Willmarth, Daryl W. +1 more
We have determined spectroscopic orbital elements for 13 systems—10 single-lined binaries and three double-lined binaries. For the three binaries with previously published spectroscopic orbits, we have computed improved or comparable elements. While two systems have relatively short periods between 10 and 19 days, the remaining systems have much l…
Energy deposition and ion production from thermal oxygen ion precipitation during Cassini's T57 flyby
Smith, Michael; Snowden, Darci; Jimson, Theodore +1 more
Cassini's Radio Science Investigation (RSS) and Langmuir Probe observed abnormally high electron densities in Titan's ionosphere during Cassini's T57 flyby. We have developed a three-dimensional model to investigate how the precipitation of thermal magnetospheric O+ may have contributed to enhanced ion production in Titan's ionosphere. …
A Study of Low-mass X-Ray Binaries in the Low-luminosity Regime
Sonbas, E.; Dhuga, K. S.; Göğüş, E.
A recent study of a small sample of X-ray binaries (XRBs) suggests a significant softening of spectra of neutron star (NS) binaries as compared to black hole (BH) binaries in the luminosity range 1034-1037 erg s-1. This softening is quantified as an anticorrelation between the spectral index and the 0.5-10 keV X-ra…
Ions Accelerated by Sounder-Plasma Interaction as Observed by Mars Express
Barabash, S.; Frahm, R. A.; Gurnett, D. +6 more
The ion sensor of the Analyzer of Space Plasmas and Energetic Atoms (ASPERA-3) experiment detects accelerated ions during pulses of radio emissions from the powerful topside sounder: the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) onboard Mars Express. Accelerated ions (O2+, O+, and lighter …
Spectroscopic Observations of the Outflowing Wind in the Lensed Quasar SDSS J1001+5027
Charlton, Jane C.; Eracleous, Michael; Oguri, Masamune +4 more
We performed spectroscopic observations of the small-separation lensed quasar SDSS J1001+5027, whose images have an angular separation θ =2\buildrel{\prime\prime}\over{.} 86, and placed constraints on the physical properties of gas clouds in the vicinity of the quasar (i.e., in the outflowing wind launched from the accretion disk). The two cylinde…
Infrared Two-Color Diagrams of AGB Stars and Planetary Nebulae Using WISE Data
Suh, Kyung-Won
We present various infrared two-color diagrams (2CDs) using WISE data for asymptotic giant branch (AGB) stars and Planetary Nebulae (PNe) and investigate possible evolutionary tracks. We use the sample of 5036 AGB stars, 660 post-AGB stars, and 2748 PNe in our Galaxy. For each object, we cross-identify the IRAS, AKARI, WISE, and 2MASS counterparts…