Search Publications
A new look inside planetary nebula LoTr 5: a long-period binary with hints of a possible third component
Montesinos, B.; Lillo-Box, J.; Zorotovic, M. +5 more
LoTr 5 is a planetary nebula with an unusual long-period binary central star. As far as we know, the pair consists of a rapidly rotating G-type star and a hot star, which is responsible for the ionization of the nebula. The rotation period of the G-type star is 5.95 d and the orbital period of the binary is now known to be ∼2700 d, one of the long…
Jet-related Excitation of the [C II] Emission in the Active Galaxy NGC 4258 with SOFIA
Appleton, P. N.; Guillard, P.; Togi, A. +7 more
We detect widespread [C II] 157.7 µm emission from the inner 5 kpc of the active galaxy NGC 4258 with the SOFIA integral field spectrometer FIFI-LS. The emission is found to be associated with warm H2, distributed along and beyond the end of the southern jet, in a zone known to contain shock-excited optical filaments. It is also a…
Spatial variations in Titan's atmospheric temperature: ALMA and Cassini comparisons from 2012 to 2015
Irwin, P. G. J.; Achterberg, R. K.; Nixon, C. A. +7 more
Submillimeter emission lines of carbon monoxide (CO) in Titan's atmosphere provide excellent probes of atmospheric temperature due to the molecule's long chemical lifetime and stable, well constrained volume mixing ratio. Here we present the analysis of 4 datasets obtained with the Atacama Large Millimeter/Submillimeter Array (ALMA) in 2012, 2013,…
What We Learn from the X-Ray Grating Spectra of Nova SMC 2016
Rauch, T.; Della Valle, M.; Behar, E. +17 more
Nova SMC 2016 has been the most luminous nova known in the direction of the Magellanic Clouds. It turned into a very luminous supersoft X-ray source between days 16 and 28 after the optical maximum. We observed it with Chandra, the HRC-S camera, and the Low Energy Transmission Grating on 2016 November and 2017 January (days 39 and 88 after optical…
Local Swift-BAT active galactic nuclei prefer circumnuclear star formation
Lutz, D.; Sturm, E.; Tacconi, L. J. +4 more
We use Herschel data to analyze the size of the far-infrared 70 µm emission for z < 0.06 local samples of 277 hosts of Swift-BAT selected active galactic nuclei (AGN), and 515 comparison galaxies that are not detected by BAT. For modest far-infrared luminosities 8.5 <log (LFIR [L⊙]) < 10.5, we find large scatte…
FUV Spectral Signatures of Molecules and the Evolution of the Gaseous Coma of Comet 67P/Churyumov-Gerasimenko
Parker, Joel Wm.; Bertaux, Jean-Loup; Stern, S. Alan +10 more
The Alice far-ultraviolet imaging spectrograph onboard Rosetta observed emissions from atomic and molecular species from within the coma of comet 67P/Churyumov-Gerasimenko during the entire escort phase of the mission from 2014 August to 2016 September. The initial observations showed that emissions of atomic hydrogen and oxygen close to the surfa…
Kepler-503b: An Object at the Hydrogen Burning Mass Limit Orbiting a Subgiant Star
Schneider, Donald P.; Mahadevan, Suvrath; Majewski, Steven R. +10 more
Using spectroscopic radial velocities with the Apache Point Observatory Galaxy Evolution Experiment (APOGEE) instrument and Gaia distance estimates, we demonstrate that Kepler-503b, currently considered a validated Kepler planet, is in fact a brown-dwarf/low-mass star in a nearly circular 7.2-day orbit around a subgiant star. Using a mass estimate…
Classifying galaxy spectra at 0.5 < z < 1 with self-organizing maps
Barmby, P.; Teimoorinia, H.; Rahmani, S.
The spectrum of a galaxy contains information about its physical properties. Classifying spectra using templates helps to elucidate the nature of a galaxy's energy sources. In this paper, we investigate the use of self-organizing maps in classifying galaxy spectra against templates. We trained semi-supervised self-organizing map networks using a s…
The GeMS/GSAOI Galactic Globular Cluster Survey (G4CS). I. A Pilot Study of the Stellar Populations in NGC 2298 and NGC 3201
Dotter, Aaron; Miller, Bryan W.; Monty, Stephanie +12 more
We present the first results from the GeMS/GSAOI Galactic Globular Cluster Survey (G4CS) of the Milky Way globular clusters NGC 3201 and NGC 2298. Using the Gemini South Adaptive Optics Imager (GSAOI), in tandem with the Gemini Multi-conjugate adaptive optics System (GeMS) on the 8.1 m Gemini-South telescope, we collected deep near-IR observations…
Near-infrared Stellar Populations in the Metal-poor, Dwarf Irregular Galaxies Sextans A and Leo A
Boyer, Martha L.; Meixner, Margaret; McDonald, Iain +3 more
We present JHK s observations of the metal-poor ([Fe/H] < -1.40) dwarf-irregular galaxies, Leo A and Sextans A, obtained with the WIYN High-resolution Infrared Camera at Kitt Peak. Their near-IR stellar populations are characterized by using a combination of color-magnitude diagrams and by identifying long-period variable stars. We…