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An X-ray activity cycle on the young solar-like star ɛ Eridani
Ducci, L.; Wolter, U.; Orlando, S. +7 more
Chromospheric Ca II activity cycles are frequently found in late-type stars, but no systematic programs have been created to search for their coronal X-ray counterparts. The typical time scale of Ca II activity cycles ranges from years to decades. Therefore, long-lasting missions are needed to detect the coronal counterparts. The XMM-Newton satell…
Exploring the Galactic Warp through Asymmetries in the Kinematics of the Galactic Disk
Majewski, Steven R.; Cheng, Xinlun; Anguiano, Borja +10 more
Previous analyses of large databases of Milky Way stars have revealed the stellar disk of our Galaxy to be warped and that this imparts a strong signature on the kinematics of stars beyond the solar neighborhood. However, due to the limitation of accurate distance estimates, many attempts to explore the extent of these Galactic features have gener…
TOI-222: a single-transit TESS candidate revealed to be a 34-d eclipsing binary with CORALIE, EulerCam, and NGTS
Henning, Thomas; Latham, David W.; Jordán, Andrés +58 more
We report the period, eccentricity, and mass determination for the Transiting Exoplanet Survey Satellite (TESS) single-transit event candidate TOI-222, which displayed a single 3000 ppm transit in the TESS 2-min cadence data from Sector 2. We determine the orbital period via radial velocity measurements (P = 33.9 d), which allowed for ground-based…
Testing interacting dark matter and dark energy model with cosmological data
Chen, Xuelei; Ma, Yin-Zhe; Cheng, Gong +2 more
We investigate the model of dark matter-dark energy (DM-DE) interaction with coupling strength proportional to the multiplication of dark sector densities with different power indices Q =γ ρcαρdβ. We first investigate the modification of the cosmic expansion history, and then further develop the formalis…
NOEMA redshift measurements of bright Herschel galaxies
Berta, S.; Omont, A.; Lagache, G. +31 more
Using the IRAM NOrthern Extended Millimeter Array (NOEMA), we conducted a program to measure redshifts for 13 bright galaxies detected in the Herschel Astrophysical Large Area Survey with S500 µm ≥ 80 mJy. We report reliable spectroscopic redshifts for 12 individual sources, which are derived from scans of the 3 and 2 mm bands, co…
The Breakthrough Listen Search for Intelligent Life: A 3.95-8.00 GHz Search for Radio Technosignatures in the Restricted Earth Transit Zone
Kalas, Paul; Gajjar, Vishal; Isaacson, Howard +5 more
We report on a search for artificial narrowband signals of 20 stars within the restricted Earth Transit Zone (rETZ) as a part of the ten-year Breakthrough Listen (BL) search for extraterrestrial intelligence (ETI). The rETZ is the region of the sky from which an observer would see Earth transit the Sun with an impact parameter of less than 0.5. Th…
NuSTAR/XMM-Newton monitoring of the Seyfert 1 galaxy HE 1143-1810. Testing the two-corona scenario
Bianchi, S.; Cappi, M.; Ponti, G. +11 more
Aims: We test the two-corona accretion scenario for active galactic nuclei in the case of the "bare" Seyfert 1 galaxy HE 1143-1810.
Methods: We perform a detailed study of the broad-band UV-X-ray spectral properties and of the short-term variability of HE 1143-1810. We present results of a joint XMM-Newton and NuSTAR monitoring of the so…
Monitoring of the radio galaxy M 87 during a low-emission state from 2012 to 2015 with MAGIC
Maraschi, L.; Covino, S.; Antonelli, L. A. +186 more
M 87 is one of the closest (z = 0.004 36) extragalactic sources emitting at very high energies (VHE, E > 100 GeV). The aim of this work is to locate the region of the VHE gamma-ray emission and to describe the observed broad-band spectral energy distribution (SED) during the low VHE gamma-ray state. The data from M 87 collected between 2012 and…
The Fornax 3D project: Non-linear colour-metallicity relation of globular clusters
Viaene, S.; Hilker, M.; Pinna, F. +15 more
Globular cluster (GC) systems of massive galaxies often show a bimodal colour distribution. This has been interpreted as a metallicity bimodality, created by a two-stage galaxy formation where the red, metal-rich GCs were formed in the parent halo and the blue metal-poor GCs were accreted. This interpretation, however, crucially depends on the ass…
Origins of Type Ibn SNe 2006jc/2015G in interacting binaries and implications for pre-SN eruptions
Sun, Ning-Chen; Crowther, Paul A.; Podsiadlowski, Philipp +2 more
Type Ibn supernovae (SNe Ibn) are intriguing stellar explosions whose spectra exhibit narrow helium lines with little hydrogen. They trace the presence of circumstellar material (CSM) formed via pre-SN eruptions of their stripped-envelope progenitors. Early work has generally assumed that SNe Ibn come from massive Wolf-Rayet (WR) stars via single-…