Search Publications
The lower dayside ionosphere of Mars from 14 years of MaRS radio science observations
Tellmann, Silvia; Pätzold, Martin; González-Galindo, Francisco +5 more
This work uses a subset of "quiet" MaRS ionospheric dayside observations (MaRSquiet, 2004-2017) and a 1-D photochemical model (IonA-2) to investigate the potential formation processes of the excess electron densities merged with the base of the main ionosphere (Mm). 42% of the investigated MaRS observations contain identified Mm, which …
A Lyα Transit Left Undetected: the Environment and Atmospheric Behavior of K2-25b
Youngblood, Allison; Mann, Andrew W.; Charbonneau, David +6 more
K2-25b is a Neptune-sized exoplanet (3.45R⊕) that orbits its M4.5 host with a period of 3.48 days. Due to its membership in the Hyades Cluster, the system has a known age (727 ± 75 Myr). K2-25b's youth and its similarities with Gl 436b suggested that K2-25b could be undergoing strong atmospheric escape. We observed two transits of K2-25…
Characteristics of Magnetic Holes in the Solar Wind Revealed by Parker Solar Probe
Zhang, J.; Huang, S. Y.; Xu, S. B. +6 more
We present a statistical analysis for the characteristics and radial evolution of linear magnetic holes (LMHs) in the solar wind from 0.166 to 0.82 au using Parker Solar Probe observations of the first two orbits. It is found that the LMHs mainly have a duration less than 25 s and the depth is in the range from 0.25 to 0.7. The durations slightly …
Gemini Planet Imager Spectroscopy of the Dusty Substellar Companion HD 206893 B
Duchêne, G.; Doyon, R.; Saumon, D. +55 more
We present new near-infrared Gemini Planet Imager (GPI) spectroscopy of HD 206893 B, a substellar companion orbiting within the debris disk of its F5V star. The J, H, K1, and K2 spectra from GPI demonstrate the extraordinarily red colors of the object, confirming it as the reddest substellar object observed to date. The significant flux increase t…
Simulations of radio-wave anisotropic scattering to interpret type III radio burst data from Solar Orbiter, Parker Solar Probe, STEREO, and Wind
Maksimovic, M.; Bale, S. D.; Bonnin, X. +9 more
Aims: We use multi-spacecraft observations of individual type III radio bursts to calculate the directivity of the radio emission. We compare these data to the results of ray-tracing simulations of the radio-wave propagation and probe the plasma properties of the inner heliosphere.
Methods: We used ray-tracing simulations of radio-wave p…
Suprathermal particles from corotating interaction regions during the first perihelion pass of Solar Orbiter
Kulkarni, S. R.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +24 more
The first orbit of Solar Orbiter provided comprehensive measurements of six corotating interaction regions (CIRs) within 1 au. Five of these CIRs were also observed by ACE at 1 au, allowing for comparisons of the suprathermal ion intensities and spectra at different radial distances. Only subtle modulations of the 4He spectral slopes ar…
An ALMA view of 11 dusty star-forming galaxies at the peak of cosmic star formation history
Cimatti, A.; Pozzi, F.; Massardi, M. +10 more
We present the ALMA view of 11 main-sequence dusty star-forming galaxies (DSFGs) (sub-)millimetre selected in the Great Observatories Origins Survey South (GOODS-S) field and spectroscopically confirmed to be at the peak of cosmic star formation history (z ~ 2). Our study combines the analysis of galaxy spectral energy distribution with ALMA conti…
Spectroscopic evolution of massive stars near the main sequence at low metallicity
Martins, F.; Palacios, A.
Context. The evolution of massive stars is not fully understood. Several physical processes affect their life and death, with major consequences on the progenitors of core-collapse supernovae, long-soft gamma-ray bursts, and compact-object mergers leading to gravitational wave emission.
Aims: In this context, our aim is to make the prediction…
The effect of active galactic nuclei on the cold interstellar medium in distant star-forming galaxies
Daddi, E.; Gómez-Guijarro, C.; Magdis, G. E. +17 more
In the framework of a systematic study with the ALMA interferometer of IR-selected main-sequence and starburst galaxies at z ∼ 1 − 1.7 at typical ∼1″ resolution, we report on the effects of mid-IR- and X-ray-detected active galactic nuclei (AGN) on the reservoirs and excitation of molecular gas in a sample of 55 objects. We find widespread detecta…
Probing the structure of a massive filament: ArTéMiS 350 and 450 µm mapping of the integral-shaped filament in Orion A
Rodriguez, L.; Roussel, H.; André, Ph. +18 more
Context. The Orion molecular cloud is the closest region of high-mass star formation. It is an ideal target for investigating the detailed structure of massive star-forming filaments at high resolution and the relevance of the filament paradigm for the earliest stages of intermediate- to high-mass star formation.
Aims: Within the Orion A mole…