Search Publications
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 …
What Is Missing from the Local Stellar Halo?
Conroy, Charlie; Naidu, Rohan P.; Sharpe, Katherine
The Milky Way's stellar halo, which extends to >100 kpc, encodes the evolutionary history of our Galaxy. However, most studies of the halo to date have been limited to within a few kiloparsecs of the Sun. Here, we characterize differences between this local halo and the stellar halo in its entirety. We construct a composite stellar halo model b…
A Snapshot Survey of Nearby Supernovae with the Hubble Space Telescope
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Kelly, Patrick L. +12 more
Over recent decades, robotic (or highly automated) searches for supernovae (SNe) have discovered several thousand events, many of them in quite nearby galaxies (distances < 30 Mpc). Most of these SNe, including some of the best-studied events to date, were found before maximum brightness and have associated with them extensive follow-up photome…
New Galaxy UV Luminosity Constraints on Warm Dark Matter from JWST
Liu, Bin; Shan, Huanyuan; Zhang, Jiajun
We exploit the recent James Webb Space Telescope (JWST) determination of galaxy UV luminosity functions over the redshift range z = 9–14.5 to derive constraints on warm dark matter (WDM) models. The delayed structure formations in WDM universes make high-redshift observations a powerful probe to set limits on the particle mass m x of WD…
A Unified Model for Bipolar Outflows from Young Stars: Kinematic and Mixing Structures in HH 30
Johnstone, Doug; Liu, Chun-Fan; Shang, Hsien +2 more
The young stellar source HH 30 is a textbook example of an ionic optical jet originating from a disk in an edge-on system shown by the Hubble Space Telescope. It has a remnant envelope in 12CO observed by the Atacama Large Millimeter/submillimeter Array. The optical jet is characterized by its narrow appearance, large line width at the …
Kinematic Age of the β-Pictoris Moving Group
Song, Inseok; Lee, Jinhee
Accurate age estimation of nearby young moving groups (NYMGs) is important as they serve as crucial testbeds in various fields of astrophysics, including the formation and evolution of stars and planets, as well as loose stellar associations. The β-Pictoris moving group (BPMG), being one of the closest and youngest NYMGs, has been extensively inve…
GRB 231115A: A Nearby Magnetar Giant Flare or a Cosmic Short Gamma-Ray Burst?
Zhou, Hao; Jin, Zhi-Ping; Wang, Yun +3 more
There are two classes of gamma-ray transients with a duration shorter than 2 s. One consists of cosmic short gamma-ray bursts (GRBs) taking place in the deep Universe via the neutron star mergers, and the other is the magnetar giant flares (GFs) with energies of ∼1044 ‑ 1046 erg from "nearby" galaxies. Though the magnetar GFs…