Search Publications
Speckle Observations and Orbits of Multiple Stars
Torres, Guillermo; Latham, David W.; Tokovinin, Andrei +2 more
We report results of speckle-interferometric monitoring of visual hierarchical systems using the newly commissioned instrument NN-EXPLORE Exoplanet and Stellar Speckle Imager at the 3.5 m WIYN telescope. During one year, 390 measurements of 129 resolved subsystems were made, while some targets were unresolved. Using our astrometry and archival dat…
Infrared K-band Photometry of Field RR Lyrae Variable Stars
Layden, Andrew C.; Chaboyer, Brian; Tiede, Glenn P. +2 more
We present multi-epoch infrared photometry in the K s -band for 74 bright RR Lyrae variable stars tied directly to the Two-Micron All-Sky Survey (2MASS) photometric system. We systematize additional K-band photometry from the literature to the 2MASS system and combine it to obtain photometry for 146 RR Lyrae stars on a consistent, mode…
Spectroscopic Follow-up of Discoveries from the NEOWISE Proper Motion Survey
Cushing, Michael C.; Kirkpatrick, J. Davy; Burgasser, Adam J. +2 more
We present low-resolution near-infrared spectra of discoveries from an all-sky proper motion search conducted using multi-epoch data from the Wide-field Infrared Survey Explorer. Using the data from NEOWISE, along with the AllWISE catalog, Schneider et al. conducted an all-sky proper motion survey to search for nearby objects with high proper moti…
Spitzer Transit Follow-up of Planet Candidates from the K2 Mission
Gorjian, Varoujan; Tamura, Motohide; Knutson, Heather A. +21 more
We present precision 4.5 µ {{m}} Spitzer transit photometry of eight planet candidates discovered by the K2 mission: K2-52 b, K2-53 b, EPIC 205084841.01, K2-289 b, K2-174 b, K2-87 b, K2-90 b, and K2-124 b. The sample includes four sub-Neptunes and two sub-Saturns, with radii between 2.6 and 18 {R}\oplus and equilibrium temperatur…
Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf
Stassun, Keivan G.; Han, Cheongho; Udalski, Andrzej +73 more
We report the discovery of a Spitzer microlensing planet OGLE-2018-BLG-0596Lb, with preferred planet-host mass ratio q ∼ 2 × 10-4. The planetary signal, which is characterized by a short (∼1 day) “bump” on the rising side of the lensing light curve, was densely covered by ground-based surveys. We find that the signal can be explained by…
Small Planets in the Galactic Context: Host Star Kinematics, Iron, and Alpha-element Enhancement
Bashi, Dolev; Zucker, Shay
We explored the occurrence rate of small close-in planets among Kepler target stars as a function of the iron abundance and the stellar total velocity {V}tot}. We estimated the occurrence rate of those planets by combining information from the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) and the California-Kepler S…
Phase Curves from the Kuiper Belt: Photometric Properties of Distant Kuiper Belt Objects Observed by New Horizons
Buratti, Bonnie J.; Singer, Kelsi N.; Stern, S. Alan +17 more
Prior to its close encounter with the Kuiper Belt object (KBO) (486958) 2014 MU69 on 2019 January 1, NASA’s New Horizons spacecraft observed other KBOs from distances greater than 0.1 au at solar phase angles far larger than those attainable from Earth. The expanded range in phase angle afforded by these distant KBO (DKBO) observations …
Single-lined Spectroscopic Binary Star Candidates from a Combination of the RAVE and Gaia DR2 Surveys
Grebel, Eva K.; Steinmetz, Matthias; Bland-Hawthorn, Joss +11 more
The combination of the final version of the Radial Velocity Experiment (RAVE) spectroscopic survey data release 6 with radial velocities (RVs) and astrometry from Gaia DR2 allows us to identify and create a catalog of single-lined binary star candidates (SB1), their inferred orbital parameters, and to inspect possible double-lined binary stars (SB…
Understanding Formation of Young, Distributed Low-mass Stars and Clusters in the W4 Cloud Complex
Samal, Manash R.; Sharma, Saurabh; Panwar, Neelam +2 more
It is well known that most of the stars form in rich clusters. However, recent Spitzer observations have shown that a significant number of stars also form in the distributed mode; their origin is not well understood. In this work, we aim to investigate clustered and distributed modes of star formation in the W4 complex. To do so, we identified an…
Hubble Ultraviolet Spectroscopy of Jupiter Trojans
Ehlmann, Bethany L.; Brown, Michael E.; Mahjoub, Ahmed +2 more
We present the first ultraviolet spectra of Jupiter Trojans. These observations were carried out using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope and cover the wavelength range 200-550 nm at low resolution. The targets include objects from both of the Trojan color subpopulations (less-red and red). We do not observe any…