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High Spatial Resolution Thermal Infrared Spectroscopy with ALES: Resolved Spectra of the Benchmark Brown Dwarf Binary HD 130948BC
Spalding, Eckhart; Leisenring, Jarron; Woodward, Charles E. +6 more
We present 2.9-4.1 µm integral field spectroscopy of the L4+L4 brown dwarf binary HD 130948BC, obtained with the Arizona Lenslets for Exoplanet Spectroscopy (ALES) mode of the Large Binocular Telescope Interferometer. The HD 130948 system is a hierarchical triple system, in which the G2V primary is joined by two co-orbiting brown dwarfs. By …
Qatar Exoplanet Survey: Qatar-7b—A Very Hot Jupiter Orbiting a Metal-rich F-Star
Bieryla, Allyson; Latham, David W.; Esquerdo, Gilbert A. +18 more
We present the discovery of Qatar-7b—a very hot and inflated giant gas planet orbiting close to its parent star. The host star is a relatively massive main-sequence F-star with mass and radius {M}\star =1.41+/- 0.03 {M}⊙ and {R}\star =1.56+/- 0.02 {R}⊙ , respectively, at a distance d = 726 ± 26 pc, and …
A Hot Saturn Near (but Unassociated with) the Open Cluster NGC 1817
Vanderburg, Andrew; Rampalli, Rayna; Bieryla, Allyson +14 more
We report on the discovery of a hot Saturn-sized planet (9.916 ± 0.985 R ⊕) around a late F-star, K2-308, observed in Campaign 13 of the K2 mission. We began studying this planet candidate because prior to the release of Gaia DR2, the host star was thought to have been a member (≥slant 90 % membership probability) of the ≈ 1 {Gyr} open …
Fragmented Comet 73P/Schwassmann-Wachmann 3
Graykowski, Ariel; Jewitt, David
Comet 73P/Schwassmann-Wachmann 3 has been observed to fragment on several occasions, yet the cause of its fragmentation remains poorly understood. We use previously unpublished archival Hubble Space Telescope data taken in 2006 to study the properties of the primary fragment, 73P-C, in order to constrain the potential fragmentation mechanisms. Cur…
Constraints on a Putative Planet Sculpting the V4046 Sagittarii Circumbinary Disk
Dong, Ruobing; Wilner, David J.; Andrews, Sean M. +3 more
We analyze the highest-resolution millimeter continuum and near-infrared (NIR) scattered-light images presented to date of the circumbinary disk orbiting V4046 Sgr, a ∼20-Myr-old actively accreting, close binary T Tauri star system located a mere 72.4 pc from Earth. We observed the disk with the Atacama Large Millimeter/submillimeter Array (ALMA) …
A Long-term Photometric Variability and Spectroscopic Study of Luminous Blue Variable AF And in M31
Joshi, Yogesh C.; Misra, Kuntal; Gangopadhyay, Anjasha +2 more
We present a photometric and spectroscopic analysis of the Hubble-Sandage variable star AF And in M31. The data have been taken under the Nainital Microlensing Survey during 1998-2002, and follow-up observations were carried out until 2011. During this period, photometric observations in Cousins R and I bands were obtained for 169 nights spanning …
Searching for Wide Companions and Identifying Circum(sub)stellar Disks through PSF Fitting of Spitzer/IRAC Archival Images
Kraus, Adam L.; Martinez, Raquel A.
Direct imaging surveys have discovered wide-orbit planetary-mass companions that challenge existing models of both star and planet formation, but their demographics remain poorly sampled. We have developed an automated binary companion point-spread function (PSF) fitting pipeline to take advantage of Spitzer's infrared sensitivity to planetary-mas…
The Case for a Large-scale Occultation Network
Rice, Malena; Laughlin, Gregory
We discuss the feasibility of and present initial designs and approximate cost estimates for a large (N ∼ 2000) network of small photometric telescopes that is purpose-built to monitor V ≲ 15 Gaia mission program stars for occultations by minor solar system bodies. The implementation of this network would permit measurement of the solar system’s t…
The Quadratic Programming Method for Extracting Emission Line Maps from Line-blended Narrowband Images
Mito, Hiroyuki; Nakada, Yoshikazu; Ueta, Toshiya +3 more
We present a method to separate blended line emission from a set of narrowband (NB) images whose distinct throughput profiles overlap with each other. This method, based on the principle of quadratic programming (QP), treats line blending as a linearly constrained quadratic optimization problem and finds the solution by imposing a condition that t…
Io’s Atmosphere Silhouetted by Jupiter Lyα
Feaga, L. M.; Roth, L.; Retherford, K. D. +4 more
We report results from a new technique for mapping Io’s SO2 vapor distribution. The Space Telescope Imaging Spectrograph (STIS) instrument on the Hubble Space Telescope observed Io during four Jupiter transit events to obtain medium resolution far-UV spectral images near the Lyα wavelength of 121.6 nm. Jupiter’s bright Lyα dayglow provi…