Search Publications
Discovery of NES, an Extended Tidal Structure in the Northeast of the Large Magellanic Cloud
Cignoni, Michele; Ripepi, Vincenzo; Tosi, Monica +4 more
We report on the discovery of a new diffuse stellar substructure protruding for >5° from the northeastern rim of the LMC disk. The structure, which we dub the northeast structure (NES), was identified by applying a Gaussian mixture model to a sample of strictly selected candidate members of the Magellanic System, extracted from the Gaia EDR3 ca…
Slowly Cooling White Dwarfs in NGC 6752
Cadelano, Mario; Pallanca, Cristina; Dalessandro, Emanuele +6 more
Recently, a new class of white dwarfs ("slowly cooling WDs") has been identified in the globular cluster M13. The cooling time of these stars is increased by stable thermonuclear hydrogen burning in their residual envelope. These WDs are thought to be originated by horizontal branch (HB) stars populating the HB blue tail that skipped the asymptoti…
GJ 3090 b: one of the most favourable mini-Neptune for atmospheric characterisation
Bouchy, F.; Helled, R.; Mao, S. +37 more
We report the detection of GJ 3090 b (TOI-177.01), a mini-Neptune on a 2.9-day orbit transiting a bright (K = 7.3 mag) M2 dwarf located at 22 pc. The planet was identified by the Transiting Exoplanet Survey Satellite and was confirmed with the High Accuracy Radial velocity Planet Searcher radial velocities. Seeing-limited photometry and speckle im…
Global dynamics and architecture of the Kepler-444 system
Delisle, J. -B.; Udry, S.; Bourrier, V. +3 more
Context. S-type planets, which orbit one component of multiple-star systems, place strong constraints on planet formation and evolution models. A notable case study is Kepler-444, a triple-star system whose primary is orbited by five planets smaller than Venus in a compact configuration, and for which the stellar binary companion revolves around t…
Modelling multiwavelength emission of Ultra-luminous X-ray Sources accreting above the Eddington limit
Wolter, A.; Pintore, F.; Zampieri, L. +1 more
We model the multiwavelength properties of binaries accreting at super-critical rates with the aim to better understand the observational properties of Ultra-luminous X-ray Sources (ULXs). We calculate an extended grid of binary systems which evolve through Roche Lobe Overflow and undergo case A mass transfer from massive donors (up to 25 ${\rm M}…
Kinetic properties of collisionless magnetic reconnection in space plasma: in situ observations
Zhou, Meng; Deng, Xiaohua; Zhong, Zhihong
In collisionless plasmas, magnetic reconnection is widely recognized as one of the most important energy conversion and dissipation processes. Although reconnection is usually manifested as macroscopic effects, such as large-scale magnetic topology change and fast plasma flows, kinetic physics is the underlying process driving these macroscopic ph…
Orbits and Occultation Opportunities of 15 TNOs Observed by New Horizons
Singer, Kelsi N.; Stern, S. Alan; Fraser, Wesley C. +10 more
We present high-precision orbits for 15 trans-Neptunian objects (TNOs) that have been observed by NASA's New Horizons spacecraft at distances from 0.092 to 2.2 au. We also give predictions of 66 future opportunities to observe stellar occultations by them in late 2021-2029, eight of which are possible to observe from the United States. Observation…
Trumpler 16-26: a new centrifugal magnetosphere star discovered via SDSS/APOGEE H-band spectroscopy
Rivinius, Thomas; Nidever, David L.; Labadie-Bartz, Jonathan +6 more
We report the discovery of a new example of the rare class of highly magnetized, rapidly rotating, helium enhanced, early B stars that produce anomalously wide hydrogen emission due to a centrifugal magnetosphere (CM). The star is Trumpler 16-26, a B1.5 V member of the Trumpler 16 open cluster. A CM was initially suspected based on hydrogen Bracke…
Parallel Plasma Loops and the Energization of the Solar Corona
Tiwari, Sanjiv K.; Golub, Leon; Winebarger, Amy R. +15 more
The outer atmosphere of the Sun is composed of plasma heated to temperatures well in excess of the visible surface. We investigate short cool and warm (<1 MK) loops seen in the core of an active region to address the role of field-line braiding in energizing these structures. We report observations from the High-resolution Coronal imager (Hi-C)…
The progenitor of the Vela pulsar
Kochanek, C. S.
With Gaia parallaxes, it is possible to study the stellar populations associated with individual Galactic supernova remnants (SNRs) to estimate the mass of the exploding star. Here, we analyse the luminous stars near the Vela pulsar and SNR to find that its progenitor was probably ($\mathrel {\raise.3ex\rm{\gt }\lower0.6ex\rm{\sim }}90\rm \,per\,c…