Search Publications
Search for Stellar Flybys in the Sco-Cen OB Association with the Gaia DR2
Kalas, Paul; De Rosa, Robert J.; Ma, Yilun
High-contrast imaging studies of debris disks have revealed a significant diversity in their morphologies, including large-scale asymmetries. Theories involving stellar flybys, an external source of gravitational disturbance, have offered a plausible explanation for the origin of these morphological variations. Our study is an experiment to gain e…
Chemically Peculiar Stars in the Open Cluster Stock 2
Bouy, Hervé; Agüeros, Marcel A.; Gebran, Marwan +2 more
The recently rediscovered open cluster Stock 2, located roughly 375 pc away and about 400 Myr old, has the potential to be an exciting new testbed for our understanding of stellar evolution. We present results from a spectroscopic campaign to characterize stars near the cluster's main-sequence turnoff; our goal is to identify candidate chemically …
Optimal Differential Astrometry for Multiconjugate Adaptive Optics. I. Astrometric Distortion Mapping using On-sky GeMS Observations of NGC 6723
McConnachie, Alan W.; Bono, Giuseppe; Fiorentino, Giuliana +7 more
The Extremely Large Telescope and the Thirty Meter Telescope will use state of the art multiconjugate adaptive optics (MCAO) systems to obtain the full D 4 advantage that their apertures can provide. However, to reach the full astrometric potential of these facilities for on-sky science requires understanding any residual astrometric di…
Detection of p-mode Oscillations in HD 35833 with NEID and TESS
Mahadevan, Suvrath; Wright, Jason T.; Logsdon, Sarah E. +15 more
We report the results of observations of p-mode oscillations in the G0 subgiant star HD 35833 in both radial velocities and photometry with NEID and TESS, respectively. We achieve separate, robust detections of the oscillation signal with both instruments (radial velocity amplitude A RV = 1.11 ± 0.09 m s-1, photometric amplit…
Unbound Close Stellar Encounters in the Solar Neighborhood
Hansen, Bradley M. S.
We present a catalog of unbound stellar pairs, within 100 pc of the Sun, that are undergoing close, hyperbolic, encounters. The data are drawn from the GAIA EDR3 catalog, and the limiting factors are errors in the radial distance and unknown velocities along the line of sight. Such stellar pairs have been suggested to be possible events associated…
Searching the SETI Ellipsoid with Gaia
Davenport, James R. A.; Siemion, Andrew P. V.; Cody, Ann Marie +4 more
The search for extraterrestrial intelligence (SETI) Ellipsoid is a geometric method for prioritizing technosignature observations based on the strategy of receiving signals synchronized to conspicuous astronomical events. Precise distances to nearby stars from Gaia makes constraining Ellipsoid crossing times possible. Here we explore the utility o…
The Population of Compact Radio Sources in M17
Menten, Karl M.; Rodríguez, Luis F.; Loinard, Laurent +7 more
We present a catalog of radio sources of the M17 region based on deep X-band radio observations centered at 10 GHz obtained with the Jansky Very Large Array in the A configuration. We detect a total of 194 radio sources, 12 of them extended and 182 compact. We find that a significant fraction (at least 40% in our catalog) have suspected gyrosynchr…
Monitoring Inner Regions in the RY Tau Jet
Ohyama, Youichi; Currie, Thayne; Kwon, Jungmi +18 more
We present multiepoch observations of the RY Tau jet for Hα and [Fe II] 1.644 µm emission lines obtained with the Subaru Coronagraphic Extreme-AO and Visible Aperture Masking Polarimetric Imager for Resolved Exoplanetary Structures (VAMPIRES), Gemini Near-infrared Integral Field Spectrograph, and Keck/OSIRIS in 2019-2021. These data show a s…
The Hubble PanCET Program: Emission Spectrum of Hot Jupiter HAT-P-41b
Deming, Drake; Mikal-Evans, Thomas; Sing, David K. +7 more
We present the most complete emission spectrum for inflated hot Jupiter HAT-P-41b combining new Hubble Space Telescope Wide Field Camera/G141 spectrum from the Hubble Panchromatic Comparative Exoplanet Treasury program with archival Spitzer eclipse observations. We found a near blackbody-like emission spectrum, which is best fitted with an isother…
An Integrative Analysis of the Rich Planetary System of the Nearby Star e Eridani: Ideal Targets for Exoplanet Imaging and Biosignature Searches
Apai, Dániel; Dietrich, Jamie; Basant, Ritvik
e Eridani, the fifth-closest Sun-like star, hosts at least three planets and could possibly harbor more. However, the veracity of the planet candidates in the system and its full planetary architecture remain unknown. Here we analyze the planetary architecture of e Eridani via DYNAMITE, a method providing an integrative assessment of the system ar…