Search Publications
Galactic structure from binary pulsar accelerations: Beyond smooth models
Chang, Philip; Widrow, Lawrence M.; Lam, Michael T. +3 more
We measure the line-of-sight accelerations of 26 binary pulsars due to the Milky Way's gravitational potential, and produce a three-dimensional map of the acceleration field of the Galaxy. Acceleration measurements directly give us the change in the line-of-sight velocity at present day, without requiring any assumptions inherent to kinematic mode…
The Factory and the Beehive. V. Chromospheric and Coronal Activity and Its Dependence on Rotation in Praesepe and the Hyades
Drake, Jeremy J.; Covey, Kevin R.; Agüeros, Marcel A. +6 more
Low-mass (≲1.2 M ⊙) main-sequence stars lose angular momentum over time, leading to a decrease in their magnetic activity. The details of this rotation–activity relation remain poorly understood, however. Using observations of members of the ≈700 Myr old Praesepe and Hyades open clusters, we aim to characterize the rotation–activity rel…
A low-density ocean inside Titan inferred from Cassini data
Goossens, Sander; van Noort, Bob; Mateo, Alfonso +2 more
The Cassini mission has provided measurements of the gravity of several moons of Saturn as well as an estimate of the tidal response, which is expressed as the degree 2 Love number k2 of its largest moon, Titan. The first estimates of Titan's Love number were larger than pre-Cassini expectations. Interior modelling suggested it may be e…
X-ray counterpart detection and γ-ray analysis of the supernova remnant G279.0+01.1 with eROSITA and Fermi-LAT
Sasaki, Manami; Santangelo, Andrea; Pühlhofer, Gerd +2 more
A thorough inspection of known Galactic supernova remnants (SNRs) along the Galactic plane with SRG/eROSITA yielded the detection of the X-ray counterpart of the SNR G279.0+01.1. The SNR is located just 1.5° above the Galactic plane. Its X-ray emission emerges as an incomplete, partial shell of ~3° angular extension. It is strongly correlated to t…
Confirmation of TiO absorption and tentative detection of MgH and CrH in the atmosphere of HAT-P-41b
Pallé, E.; Chen, G.; Murgas, F. +3 more
Understanding the role of optical absorbers is critical for linking the properties of the dayside and terminator atmospheres of hot Jupiters. This study aims to identify the signatures of optical absorbers in the atmosphere of the hot Jupiter HAT-P-41b. We conducted five transit observations of this planet to obtain its optical transmission spectr…
Why Are (Almost) All the Protostellar Outflows Aligned in Serpens Main?
Manoj, P.; Narang, Mayank; Reiter, Megan +4 more
We present deep 1.4–4.8 µm JWST-NIRCam imaging of the Serpens Main star-forming region and identify 20 candidate protostellar outflows, most with bipolar structure and identified driving sources. The outflow position angles (PAs) are strongly correlated, and they are aligned within ±24° of the major axis of the Serpens filament. These orient…
Finding accreted stars in the Milky Way: clues from NIHAO simulations
Buder, S.; Mijnarends, L.; Buck, T.
Exploring the marks left by galactic accretion in the Milky Way helps us understand how our Galaxy was formed. However, finding and studying accreted stars and the galaxies they came from has been challenging. This study uses a simulation from the Numerical Investigation of a Hundred Astronomical Objects project, which now includes a wider range o…
Observations of fan-spine topology by Solar Orbiter/EUI: Rotational motions and indications of Alfvén waves
Berghmans, D.; Parenti, S.; Valori, G. +3 more
Context. Torsional Alfvén waves do not produce any intensity variation and are therefore challenging to observe with imaging instruments. Previously, Alfvén wave observations were reported throughout all the layers of the solar atmosphere using spectral imaging.
Aims: We present a torsional Alfvén wave detected in an inverted Y-shaped structu…
JWST's First Glimpse of a z > 2 Forming Cluster Reveals a Top-heavy Stellar Mass Function
Daddi, Emanuele; Lu, Shiying; Kodama, Tadayuki +11 more
Clusters and their progenitors (protoclusters) at z ∼ 2 ‑ 4, the peak epoch of star formation, are ideal laboratories to study the formation process of both the clusters themselves and their member galaxies. However, a complete census of their member galaxies has been challenging due to observational difficulties. Here we present new JWST/NIRCam o…
Solar Eruptions in Nested Magnetic Flux Systems
Antiochos, Spiro K.; Kumar, Pankaj; DeVore, C. Richard +2 more
The magnetic topology of erupting regions on the Sun is a key factor in the energy buildup and release, and the subsequent evolution of flares and coronal mass ejections (CMEs). The presence/absence of null points and separatrices dictates whether and where current sheets form and magnetic reconnection occurs. Numerical simulations show that energ…