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X-Ray Emission of Ultraviolet Variable Active Galactic Nucleus Candidates
Wasleske, Erik J.; Baldassare, Vivienne F.
We analyze the X-ray properties of a sample of 23 high-probability active galactic nucleus (AGN) candidates with ultraviolet variability identified in Wasleske et al. Using data from the Chandra X-ray Observatory and XMM-Newton Observatory, we that find 11/23 nuclei are X-ray detected. We use spectral energy distribution modeling to compute star f…
Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752
Pilachowski, Catherine A.; Deliyannis, Constantine P.; Shetrone, Matthew D. +8 more
We present analyses of improved photometric and spectroscopic observations for two detached eclipsing binaries at the turnoff of the open cluster NGC 752: the 1.01 days binary DS And and the 15.53 days BD +37 410. For DS And, we find M 1 = 1.692 ± 0.004 ± 0.010M ⊙, R 1 = 2.185 ± 0.004 ± 0.008R ⊙, M …
First Detection of Radio Emission Associated with a Classical Cepheid
Rupen, M. P.; Evans, N. R.; Matthews, L. D.
We report the detection of 15 GHz radio continuum emission associated with the classical Cepheid variable star δ Cephei (δ Cep) based on observations with the Karl G. Jansky Very Large Array. Our results constitute the first probable detection of radio continuum emission from a classical Cepheid. We observed the star at pulsation phase ϕ ≈ 0.43 (c…
Confirmation of Color-dependent Centroid Shift Measured After 1.8 Years with HST
Lu, Jessica R.; Cole, Andrew A.; Fukui, Akihiko +10 more
We measured the precise masses of the host and planet in the OGLE-2003-BLG-235 system, when the lens and source were resolving, with 2018 Keck high resolution images. This measurement is in agreement with the observation taken in 2005 with the Hubble Space Telescope (HST). In the 2005 data, the lens and sources were not resolved and the measuremen…
Atmospheric Retrieval of L Dwarfs: Benchmarking Results and Characterizing the Young Planetary Mass Companion HD 106906 b in the Near-infrared
Marley, Mark; Meyer, Michael R.; Quanz, Sascha P. +7 more
We present model constraints on the atmospheric structure of HD 106906 b, a planetary-mass companion orbiting at a ~700 au projected separation around a 15 Myr old stellar binary, using the APOLLO retrieval code on spectral data spanning 1.1-2.5 µm. C/O ratios can provide evidence for companion formation pathways, as such pathways are ambigu…
The K2 and TESS Synergy. II. Revisiting 26 Systems in the TESS Primary Mission
Vanderburg, Andrew; Bieryla, Allyson; Latham, David W. +16 more
The legacy of NASA's K2 mission has provided hundreds of transiting exoplanets that can be revisited by new and future facilities for further characterization, with a particular focus on studying the atmospheres of these systems. However, the majority of K2-discovered exoplanets have typical uncertainties on future times of transit within the next…
Testing the Interaction between a Substellar Companion and a Debris Disk in the HR 2562 System
Duchêne, Gaspard; Oppenheimer, Rebecca; Rice, Malena +51 more
The HR 2562 system is a rare case where a brown dwarf companion resides in a cleared inner hole of a debris disk, offering invaluable opportunities to study the dynamical interaction between a substellar companion and a dusty disk. We present the first ALMA observation of the system as well as the continued Gemini Planet Imager monitoring of the c…
Signal Synchronization Strategies and Time Domain SETI with Gaia DR3
Davenport, James R. A.; Siemion, Andrew P. V.; Croft, Steve +1 more
Spatiotemporal techniques for signal coordination with actively transmitting extraterrestrial civilizations, without the need for prior communication, can constrain technosignature searches to a significantly smaller coordinate space. With the variable star catalog from Gaia Data Release 3, we explore two related signaling strategies: the SETI Ell…
The SSA22 H I Tomography Survey (SSA22-HIT). I. Data Set and Compiled Redshift Catalog
Ouchi, Masami; Hennawi, Joseph F.; Inoue, Akio K. +16 more
We conducted a deep spectroscopic survey, named SSA22-HIT, in the SSA22 field with the DEep Imaging MultiObject Spectrograph (DEIMOS) on the Keck telescope, designed to tomographically map high-z H I gas through analysis of Lyα absorption in background galaxies' spectra. In total, 198 galaxies were spectroscopically confirmed at 2.5 < z < 6 …
Spinning up a Daze: TESS Uncovers a Hot Jupiter Orbiting the Rapid Rotator TOI-778
Bieryla, Allyson; Latham, David W.; Quinn, Samuel N. +69 more
NASA's Transiting Exoplanet Survey Satellite (TESS) mission has been uncovering a growing number of exoplanets orbiting nearby, bright stars. Most exoplanets that have been discovered by TESS orbit narrow-line, slow-rotating stars, facilitating the confirmation and mass determination of these worlds. We present the discovery of a hot Jupiter orbit…