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A new candidate pulsating ULX in NGC 7793
Bachetti, M.; Webb, N. A.; Fürst, F. +2 more
We report here the discovery of NGC 7793 ULX-4, a new transient ultraluminous X-ray source (ULX) in NGC 7793, a spiral galaxy already well known for harbouring several ULXs. This new source underwent an outburst in 2012, when it was detected by XMM-Newton and the Swift X-ray telescope. The outburst reached a peak luminosity of 3.4 × 1039
A search for transiting planets around hot subdwarfs. I. Methods and performance tests on light curves from Kepler, K2, TESS, and CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +79 more
Context. Hot subdwarfs experienced strong mass loss on the red giant branch (RGB) and are now hot and small He-burning objects. These stars constitute excellent opportunities for addressing the question of the evolution of exoplanetary systems directly after the RGB phase of evolution.
Aims: In this project we aim to perform a transit survey …
The Pristine Inner Galaxy Survey (PIGS) III: carbon-enhanced metal-poor stars in the bulge
Lewis, Geraint F.; Placco, Vinicius M.; Buder, Sven +15 more
The most metal-deficient stars hold important clues about the early buildup and chemical evolution of the Milky Way, and carbon-enhanced metal-poor (CEMP) stars are of special interest. However, little is known about CEMP stars in the Galactic bulge. In this paper, we use the large spectroscopic sample of metal-poor stars from the Pristine Inner G…
A sub-Neptune and a non-transiting Neptune-mass companion unveiled by ESPRESSO around the bright late-F dwarf HD 5278 (TOI-130)
Bouchy, F.; Rebolo, R.; Pallé, E. +45 more
Context. Transiting sub-Neptune-type planets, with radii approximately between 2 and 4 R⊕, are of particular interest as their study allows us to gain insight into the formation and evolution of a class of planets that are not found in our Solar System.
Aims: We exploit the extreme radial velocity (RV) precision of the ultra-stable…
Role of Compressive Viscosity and Thermal Conductivity on the Damping of Slow Waves in Coronal Loops with and Without Heating-Cooling Imbalance
Srivastava, A. K.; Wang, T. J.; Prasad, Abhinav
In the present article, we derive a new dispersion relation for slow magnetoacoustic waves invoking the effect of thermal conductivity, compressive viscosity, radiation, and an unknown heating term along with the consideration of heating-cooling imbalance from linearized MHD equations. We solve the general dispersion relation to understand the rol…
Evolved massive stars at low-metallicity. III. A source catalog for the Large Magellanic Cloud
Yang, Ming; Bonanos, Alceste Z.; Gao, Jian +9 more
We present a clean, magnitude-limited (IRAC1 or WISE1 ≤ 15.0 mag) multiwavelength source catalog for the Large Magellanic Cloud (LMC). The catalog was built by crossmatching (1″) and deblending (3″) between the source list of Spitzer Enhanced Imaging Products and Gaia Data Release 2, with strict constraints on the Gaia astrometric solution in orde…
Faint LAEs near z > 4.7 C IV absorbers revealed by MUSE
Salvadori, S.; Ouchi, M.; Vanzella, E. +5 more
We present the results from the search for Lyman alpha emitters (LAEs) in the proximity of 11 C IV absorption systems at z > 4.7 in the spectrum of the QSO J1030+0524, using data from Multi-Unit Spectroscopic Explorer. We have found multiple LAE candidates close to four C IV systems at $z_{{\rm{C {\small IV}}}}=4.94$ -5.74 with $\log _{10}(N_{{…
Global and local processes of thin current sheet formation during substorm growth phase
Artemyev, A. V.; Runov, A.; Angelopoulos, V. +4 more
Formation of thin current sheets in Earth's magnetotail is a critical element of the magnetosphere dynamics. The configuration and stability of these thin current sheets control the onset of magnetic reconnection and particle acceleration in the magnetotail during substorms and other geomagnetic activities. In recent years, multipoint observations…
Completeness of the Gaia-verse - IV. The astrometry spread function of Gaia DR2
Everall, Andrew; Boubert, Douglas; Koposov, Sergey E. +2 more
Gaia Data Release 2 (DR2) published positions, parallaxes, and proper motions for an unprecedented 1331 909 727 sources, revolutionizing the field of Galactic dynamics. We complement this data with the astrometry spread function (ASF), the expected uncertainty in the measured positions, proper motions, and parallax for a non-accelerating point sou…
X-ray binary accretion states in active galactic nuclei? Sensing the accretion disc of supermassive black holes with mid-infrared nebular lines
Fernández-Ontiveros, Juan A.; Muñoz-Darias, Teo
Accretion states, which are universally observed in stellar mass black holes in X-ray binaries, might be expected in active galactic nuclei (AGN). This is the case at low luminosities, when the jet-corona coupling dominates the energy output in both populations. Previous attempts to extend this framework to a wider AGN population have been extreme…