Search Publications
A Larger Sample Confirms Small Planets around Hot Stars Are Misaligned
Petigura, Erik A.; Winn, Joshua N.; Wang, Songhu +7 more
The distribution of stellar obliquities provides critical insight into the formation and evolution pathways of exoplanets. In the past decade, it was found that hot stars hosting hot Jupiters are more likely to have high obliquities than cool stars, but it is not clear whether this trend exists only for hot Jupiters or holds for other types of pla…
Surface Brightness Fluctuations in Two SPT Clusters: A Pilot Study
Kraft, Ralph; Bulbul, Esra; Romero, Charles E. +10 more
Studies of surface brightness fluctuations in the intracluster medium present an indirect probe of turbulent properties such as the turbulent velocities, injection scales, and the slope of the power spectrum of fluctuations toward smaller scales. With the advancement of Sunyaev–Zel'dovich (SZ) studies and surveys relative to X-ray observations, we…
Delayed and Fast-rising Radio Flares from an Optical and X-Ray-detected Tidal Disruption Event in the Center of a Dwarf Galaxy
Yang, Lei; Shu, Xinwen; Wang, Yibo +7 more
AT 2018cqh is a unique tidal disruption event (TDE) discovered in a dwarf galaxy. Both the light-curve fitting and galaxy scaling relationships suggest a central black hole mass in the range of 5.9 < logM BH/M ☉ < 6.4. The r-band peak luminosity is ∼ 1043 erg s‑1, making AT 2018cqh relatively faint…
Magnetic Fields and Plasma Heating in the Sun's Atmosphere
Kleint, L.; de Wijn, A. G.; Tritschler, A. +3 more
We use the first publicly available data from the Daniel K. Inouye Solar Telescope to track magnetic connections from the solar photosphere into the corona. We scrutinize relationships between chromospheric magnetism and bright chromospheric, transition region, and coronal plasmas. In 2022 June, the Visible Spectro-Polarimeter (ViSP) instrument ta…
An Empirical Calibration of the Tip of the Red Giant Branch Distance Method in the Near Infrared. I. Hubble Space Telescope WFC3/IR F110W and F160W Filters
McQuinn, Kristen B. W.; Dolphin, Andrew E.; Skillman, Evan D. +4 more
The tip of the red giant branch (TRGB) based distance method in the I band is one of the most efficient and precise techniques for measuring distances to nearby galaxies (D ≲ 15 Mpc). The TRGB in the near-infrared (NIR) is 1–2 mag brighter relative to the I band, and has the potential to expand the range over which distance measurements to nearby …
NuSTAR Observations of Candidate Subparsec Binary Supermassive Black Holes
Djorgovski, S. G.; Connor, Thomas; Walton, Dominic J. +12 more
We present an analysis of NuSTAR X-ray observations of three active galactic nuclei (AGN) that were identified as candidate subparsec binary supermassive black hole (SMBH) systems in the Catalina Real-Time Transient Survey based on apparent periodicity in their optical light curves. Simulations predict that close-separation accreting SMBH binaries…
Runaway OB Stars in the Small Magellanic Cloud. III. Updated Kinematics and Insights into Dynamical versus Supernova Ejections
Oey, M. S.; Phillips, Grant D.; Cuevas, Maria +2 more
We use the kinematics of field OB stars to estimate the frequencies of runaway stars generated by the dynamical ejection scenario (DES), the binary supernova scenario (BSS), and the combined two-step mechanism. We update the proper motions for field OB and OBe stars in the Small Magellanic Cloud (SMC) using Gaia DR3. Our sample now contains 336 st…
CLASSY. X. Highlighting Differences between Partial Covering and Semianalytic Modeling in the Estimation of Galactic Outflow Properties
Martin, Crystal L.; Charlot, Stéphane; Skillman, Evan D. +17 more
Feedback-driven massive outflows play a crucial role in galaxy evolution by regulating star formation and influencing the dynamics of surrounding media. Extracting outflow properties from spectral lines is a notoriously difficult process for a number of reasons, including the possibility that a substantial fraction of the outflow is carried by den…
Double "acct": A Distinct Double-peaked Supernova Matching Pulsational Pair Instability Models
Rest, A.; Angus, C. R.; Foley, R. J. +35 more
We present multiwavelength data of SN 2020acct, a double-peaked stripped-envelope supernova (SN) in NGC 2981 at ∼150 Mpc. The two peaks are temporally distinct, with maxima separated by 58 rest-frame days and a factor of 20 reduction in flux between. The first is luminous (Mr = ‑18.00 ± 0.02 mag) and blue (g ‑ r = 0.27 ± 0.03 mag) and d…
Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Transmission Spectroscopy
Henning, Thomas; Usuda, Tomonori; Hellier, Coel +103 more
Recent discoveries of Earth-sized planets transiting nearby M dwarfs have made it possible to characterize the atmospheres of terrestrial planets via follow-up spectroscopic observations. However, the number of such planets receiving low insolation is still small, limiting our ability to understand the diversity of the atmospheric composition and …