Search Publications
A Systematic Study of Galactic Outflows via Fluorescence Emission: Implications for Their Size and Structure
Heckman, Timothy M.; Wang, Bingjie; Norman, Colin A. +1 more
Galactic outflows play a major role in the evolution of galaxies, but the underlying physical processes are poorly understood. This is mainly because we have little information about the outflow structure, especially on large scales. In this paper, we probe the structure of galactic outflows in low-z starbursts using a combination of ultraviolet s…
Estimating black hole masses: Accretion disk fitting versus reverberation mapping and single epoch
Celotti, Annalisa; Ghisellini, Gabriele; Sbarrato, Tullia +1 more
We selected a sample of 28 Type 1 active galactic nuclei for which a black hole mass has been inferred using the reverberation mapping technique and single epoch scaling relations. All 28 sources show clear evidence of the "Big Blue Bump" in the optical-UV band whose emission is produced by an accretion disk (AD) around a supermassive black hole. …
High-contrast Thermal Infrared Spectroscopy with ALES: The 3-4 µm Spectrum of κ Andromedae b
Spalding, Eckhart; Barman, Travis; Woodward, Charles E. +7 more
We present the first L-band (2.8-4.1 µm) spectroscopy of κ Andromedae b, a ∼20 MJup companion orbiting at 1″ projected separation from its B9-type stellar host. We combine our Large Binocular Telescope (LBT) Arizona Lenslets for Exoplanet Spectroscopy (ALES) integral field spectrograph data with measurements from other instruments…
Very long baseline interferometry imaging of the advancing ejecta in the first gamma-ray nova V407 Cygni
Munari, U.; Cheung, C. C.; Giroletti, M. +7 more
Context. In 2010 March, the Large Area Telescope on board Fermi revealed a transient gamma-ray source that is positionally coincident with the optical nova in the symbiotic binary, V407 Cyg. This event marked the first discovery of gamma-ray emission from a nova.
Aims: We aim to obtain resolved radio imaging of the material involved in the no…
The OTELO survey. Nature and mass-metallicity relation for Hα emitters at z ∼ 0.4
Gallego, Jesús; Sánchez-Portal, Miguel; Pintos-Castro, Irene +14 more
Context. A sample of low-mass Hα emission line sources at z ∼ 0.4 was studied in the context of the mass-metallicty relation (MZR) and its possible evolution. We drew our sample from the OSIRIS Tunable Emission Line Object (OTELO) survey, which exploits the red tunable filter of OSIRIS at the Gran Telescopio Canarias to perform a blind narrow-band…
Orbits and resonances of the regular moons of Neptune
de Pater, Imke; Showalter, Mark R.; Lissauer, Jack J. +3 more
We report integrated orbital fits for the inner regular moons of Neptune based on the most complete astrometric data set to date, with observations from Earth-based telescopes, Voyager 2, and the Hubble Space Telescope covering 1981-2016. We summarize the results in terms of state vectors, mean orbital elements, and orbital uncertainties. The esti…
TESS photometry of the eclipsing δ Scuti star AI Hydrae
Kristiansen, Martti H.; Hong, Kyeongsoo; Lee, Jae Woo
AI Hya has been known as an eclipsing binary with a monoperiodic $\delta$ Sct pulsator. We present the results from its TESS (Transiting Exoplanet Survey Satellite) photometry observed during Sector 7. Including our five minimum epochs, the eclipse timing diagram displays the apsidal motion with a rate of $\dot{\omega } = 0.075 \pm 0.031\:$ deg $\…
Evidence for a rapid decrease of Pluto's atmospheric pressure revealed by a stellar occultation in 2019
Kasaba, Y.; Ohsawa, R.; Kagitani, M. +4 more
We report observations of a stellar occultation by Pluto on 2019 July 17. A single-chord high-speed (time resolution = 2 s) photometry dataset was obtained with a CMOS camera mounted on the Tohoku University 60 cm telescope (Haleakala, Hawaii). The occultation light curve is satisfactorily fitted to an existing atmospheric model of Pluto. We find …
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…
Sensitivity Analyses of Exoplanet Occurrence Rates from Kepler and Gaia
Bryson, Steve; Huber, Daniel; Batalha, Natalie +11 more
We infer the number of planets per star as a function of orbital period and planet size using Kepler archival data products with updated stellar properties from the Gaia Data Release 2. Using hierarchical Bayesian modeling and Hamiltonian Monte Carlo, we incorporate planet radius uncertainties into an inhomogeneous Poisson point process model. We …