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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
Acceleration of suprathermal protons near an interplanetary shock
Wang, L.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +12 more
Context. Interplanetary collisionless shocks are known to be sources of energetic charged particles up to hundreds of MeV. However, the underlying acceleration mechanisms are still under debate.
Aims: We determine the properties of suprathermal protons accelerated by the interplanetary shock on 2021 November 3 with the unprecedented high-reso…
Intracluster light in the core of z ∼ 2 galaxy proto-clusters
Matharu, J.; Mei, S.; Gonzalez, A. H. +5 more
Intracluster light is thought to originate from stars that were ripped away from their parent galaxies by gravitational tides and galaxy interactions during the build up of the cluster. The stars from such interactions will accumulate over time, so semi-analytic models suggest that the abundance of intracluster stars is negligible in young proto-c…
Transition disc nature of post-AGB binary systems confirmed by mid-infrared interferometry
Cuello, N.; Mérand, A.; Van Winckel, H. +4 more
Context. Many properties of circumbinary discs around evolved post-asymptotic giant branch (post-AGB) binary systems are similar to those of protoplanetary discs around young stars. The deficits of near-infrared (near-IR) flux in the spectral energy distributions (SEDs) of these systems hints towards large dust-free cavities that are reminiscent o…