Search Publications
A Blueprint for the Milky Way's Stellar Populations. V. 3D Local Dust Extinction
Beers, Timothy C.; Chiti, Anirudh; An, Deokkeun
Using a grid of empirically calibrated synthetic spectra developed in our previous study, we construct an all-sky 3D extinction map from the large collection of low-resolution XP spectra in Gaia DR3. Along each line of sight, with an area ranging from 0.2 to 13.4 deg2, we determine both the reddening and metallicity of main-sequence sta…
Origin and Properties of the Near-subsonic Solar Wind Observed by Parker Solar Probe
Liu, Ying D.; Kasper, Justin C.; Stevens, Michael L. +3 more
We identify and examine the solar wind intervals near the sonic critical point (i.e., M S ∼ 1) observed by the Parker Solar Probe. The near-subsonic wind intervals show similar properties: a low density, an extremely low velocity, a low proton temperature, and essentially no magnetic field deflections compared with the surrounding sol…
The impact of third dredge-up on the mass loss of Mira variables
Eriksson, K.; Wolter, U.; Höfner, S. +8 more
Context. The details of the mass-loss process in the late stages of low- and intermediate-mass stellar evolution are not well understood, in particular its dependence on stellar parameters. Mira variables are highly suitable targets for studying this mass-loss process. Aims. Here, we follow up on our earlier finding that a near-to-mid-infrared (NI…
Metallicities and Refined Stellar Parameters for 52 Cool Dwarfs with Transiting Planets and Planet Candidates
Mayo, Andrew W.; Schlieder, Joshua E.; Giacalone, Steven +8 more
We collected near-infrared spectra of 65 cool stars with the NASA Infrared Telescope Facility and analyzed them to calculate accurate metallicities and stellar parameters. The sample of 55 M dwarfs and 10 K dwarfs includes 25 systems with confirmed planets and 27 systems with planet candidates identified by the K2 and TESS missions. Three of the 2…
Connecting core galaxy properties to the massive black hole binary population
Gültekin, Kayhan; Harris, C. J.
We investigate how the properties of massive black hole binaries influence the observed properties of core galaxies. We compare the observed trend in stellar mass deficit as a function of total stellar mass in the core galaxy with predicted trends in IllustrisTNG. We calculate mass deficits in simulated galaxies by applying subgrid, post-processin…
High-resolution Spectroscopic Analysis of Four Unevolved Barium Stars
Pereira, C. B.; Holanda, N.; Drake, N. A. +4 more
A classical local thermodynamic equilibrium analysis, based on high-resolution spectroscopic data, is performed for a sample of three potential barium dwarf candidates and one star already recognized as such. We derived their atmospheric parameters, estimated their masses and luminosities, and determined chemical abundances for a set of 21 element…
PRODIGE - planet-forming disks in Taurus with NOEMA. I. Overview and first results for 12CO, 13CO, and C18O
Cunningham, N.; Ceccarelli, C.; Henning, Th. +21 more
Context. The physics and chemistry of planet-forming disks are far from being fully understood. To make further progress, both broad line surveys and observations of individual tracers in a statistically significant number of disks are required.
Aims: Our aim is to perform a line survey of eight planet-forming Class II disks in Taurus with th…
Crucial future observations and directions for unveiling magnetopause dynamics and their geospace impacts
Nykyri, Katariina; Shi, Xueling; Hartinger, Michael D. +5 more
The dynamics of Earth's magnetopause, driven by several different external/internal physical processes, plays a major role in the geospace energy budget. Given magnetopause motion couples across many space plasma regions, numerous forms of observations may provide valuable information in understanding these dynamics and their impacts. In-situ mult…
X-ray and optical observations of the millisecond pulsar binary PSR J1431–4715
de Martino, D.; Dhillon, V. S.; Rea, N. +7 more
We present the first X-ray observation of the energetic millisecond pulsar binary PSR J1431‑4715, performed with XMM-Newton and complemented with fast optical multi-band photometry acquired with the ULTRACAM instrument at ESO-NTT. It is found as a faint X-ray source without a significant orbital modulation. This contrasts with the majority of syst…
Long-period modulation of the classical T Tauri star CI Tau. Evidence for an eccentric close-in massive planet at 0.17 au
Moutou, C.; Carmona, A.; Bayo, A. +13 more
Context. Detecting planets within protoplanetary disks around young stars is essential for understanding planet formation and evolution. However, planet detection using the radial velocity method faces challenges due to the strong stellar activity in these early stages.
Aims: We detect long-term periodicities in photometric and spectroscopic …