Search Publications
Heavy-ion Acceleration in 3He-rich Solar Energetic Particle Events: New Insights from Solar Orbiter
Lario, D.; Wimmer-Schweingruber, R. F.; Allen, R. C. +7 more
We present Solar Orbiter energetic particle observations of two 3He-rich events with features more clearly observed than in prior studies. The event of 2022 November 9 observed from 0.59 au contained hundreds of ultraheavy (UH; mass >78 amu) ions whereas previous observations at 1 au have shown only an occasional count or two. The ev…
On the evolution of the size of Lyman alpha haloes across cosmic time: no change in the circumgalactic gas distribution when probed by line emission
Blaizot, Jérémy; Garel, Thibault; Verhamme, Anne +18 more
Lyman α (Lyα) is now routinely used as a tool for studying high-redshift galaxies, and its resonant nature means it can trace neutral hydrogen around star-forming galaxies. Integral field spectrograph measurements of high-redshift Lyα emitters indicate that significant extended Lyα halo emission is ubiquitous around such objects. We present a samp…
A fresh perspective on the 3D dynamics of Tycho's supernova remnant: Ejecta asymmetries in the X-ray band
Ballet, J.; Decourchelle, A.; Acero, F. +1 more
Context. Even 450 yr after the explosion of the Type Ia SN 1572, the dynamics of the Tycho supernova remnant (Tycho's SNR) can offer keys to improving our understanding of the explosion mechanism and the interaction of the remnant with the interstellar medium.
Aims: To probe the asymmetries and the evolution of the SNR, we tracked the ejecta …
HAZMAT. IX. An Analysis of the UV and X-Ray Evolution of Low-mass Stars in the Era of Gaia
Jackman, James A. G.; Peacock, Sarah; Barman, Travis +6 more
Low-mass stars (≤1 M ⊙) are some of the best candidates for hosting planets with detectable life because of these stars' long lifetimes and relative ratios of planet to star mass and radius. An important aspect of these stars to consider is the amount of ultraviolet (UV) and X-ray radiation incident on planets in the habitable zones due…
The ubiquity of carbon dredge-up in hydrogen-deficient white dwarfs as revealed by GALEX
Blouin, Simon; Kilic, Mukremin; Tremblay, Pier-Emmanuel +1 more
The convective dredge-up of carbon from the interiors of hydrogen-deficient white dwarfs has long been invoked to explain the presence of carbon absorption features in the spectra of cool DQ stars ($T_{\rm eff} \lt 10\,000\,$K). It has been hypothesized that this transport process is not limited to DQ white dwarfs and also operates, albeit less ef…
Revealing the structure of the lensed quasar Q 0957+561. III. Constraints on the size of the broad-line region
Hanslmeier, A.; Muñoz, J. A.; Mediavilla, E. +6 more
Aims: Our aim is to examine the size, kinematics, and geometry of the broad-line region (BLR) in the double-lensed quasar Q 0957+561 by analyzing the impact of microlensing on various rest-frame ultraviolet broad-emission lines (BELs).
Methods: We explore the influence of intrinsic variability and microlensing on the C IV, C III], and Mg…
Dissecting the Mid-infrared Heart of M83 with JWST
Kumari, Nimisha; Hirschauer, Alec S.; Hernandez, Svea +10 more
We present a first look at the MRS observations of the nucleus of the nearby galaxy M83, taken with MIRI on board JWST. The observations show a rich set of emission features from the ionized gas, warm molecular gas, and dust. To begin dissecting the complex processes in this part of the galaxy, we divide the observations into four different region…
Flares, Rotation, Activity Cycles, and a Magnetic Star–Planet Interaction Hypothesis for the Far-ultraviolet Emission of GJ 436
Loyd, R. O. Parke; Jackman, James A. G.; France, Kevin +6 more
Variability in the far-ultraviolet (FUV) emission produced by stellar activity affects photochemistry and heating in orbiting planetary atmospheres. We present a comprehensive analysis of the FUV variability of GJ 436, a field-age M2.5V star (P rot ≈ 44 days) that is orbited by a warm Neptune-sized planet (M ≈ 25 M ⊕, R ≈ 4.1…
RELICS: A Strong-lens Model of SMACS J0723.3-7327
Mahler, Guillaume; Coe, Dan; Sharon, Keren +2 more
We present the details of a strong-lens model of SMACS J0723.3-7327, which was made public as part of the data and high-level science products (HLSP) release of the RELICS Hubble Space Telescope (HST) treasury program (Reionization Lensing Cluster Survey; GO-14096, PI: Coe). The model products were made available on the Mikulski Archive for Space …
Hyades Member K2-136c: The Smallest Planet in an Open Cluster with a Precisely Measured Mass
Vanderburg, Andrew; Shkolnik, Evgenya; López-Morales, Mercedes +39 more
K2-136 is a late-K dwarf (0.742 ± 0.039 M ⊙) in the Hyades open cluster with three known, transiting planets and an age of 650 ± 70 Myr. Analyzing K2 photometry, we found that planets K2-136b, c, and d have periods of 8.0, 17.3, and 25.6 days and radii of 1.014 ± 0.050 R ⊕, 3.00 ± 0.13 R ⊕, and 1.565 ± 0.077 R