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Cepheids with giant companions. II. Spectroscopic confirmation of nine new double-lined binary systems composed of two Cepheids
Bono, Giuseppe; Thompson, Ian B.; Gieren, Wolfgang +13 more
Context. Binary Cepheids with giant companions are crucial for studying the physical properties of Cepheid variables, in particular providing the best means to measure their masses. Systems composed of two Cepheids are even more important, but to date, only one such system has been identified, in the Large Magellanic Cloud (LMC).
Aims: Our cu…
J-PLUS: galaxy-star-quasar classification for DR3
Hernández-Monteagudo, C.; Alvarez-Candal, A.; Vázquez Ramió, H. +20 more
The Javalambre Photometric Local Universe Survey (J-PLUS) is a 12-band photometric survey using the 83-cm JAST telescope. Data Release 3 includes 47.4 million sources. J-PLUS DR3 only provides star-galaxy classification so that quasars are not identified from the other sources. Given the size of the data set, machine learning methods could provide…
The solar cycle 25 multi-spacecraft solar energetic particle event catalog of the SERPENTINE project
Hayes, L. A.; Vainio, R.; Mitchell, J. G. +26 more
Context. The solar energetic particle analysis platform for the inner heliosphere (SERPENTINE) project, funded through the H2020-SPACE-2020 call of the European Union's Horizon 2020 framework program, employs measurements of the new inner heliospheric spacecraft fleet to address several outstanding questions on the origin of solar energetic partic…
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…