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A Warm Jupiter Transiting an M Dwarf: A TESS Single-transit Event Confirmed with the Habitable-zone Planet Finder
Cochran, William D.; Endl, Michael; Mahadevan, Suvrath +30 more
We confirm the planetary nature of a warm Jupiter transiting the early M dwarf TOI-1899 using a combination of available TESS photometry; high-precision, near-infrared spectroscopy with the Habitable-zone Planet Finder; and speckle and adaptive optics imaging. The data reveal a transiting companion on an ∼29 day orbit with a mass and radius of $0.…
A basin-free spherical shape as an outcome of a giant impact on asteroid Hygiea
Jorda, L.; Lamy, P.; Colas, F. +44 more
(10) Hygiea is the fourth largest main belt asteroid and the only known asteroid whose surface composition appears similar to that of the dwarf planet (1) Ceres1,2, suggesting a similar origin for these two objects. Hygiea suffered a giant impact more than 2 Gyr ago3 that is at the origin of one of the largest asteroid famili…
Properties of flares and CMEs on EV Lac: possible erupting filament
Guenther, E. W.; Muheki, Priscilla; Mutabazi, T. +1 more
Flares and coronal mass ejections (CMEs) are very powerful events in which energetic radiation and particles are ejected within a short time. These events thus can strongly affect planets that orbit these stars. This is particularly relevant for planets of M-stars, because these stars stay active for a long time during their evolution and yet pote…
An eclipsing substellar binary in a young triple system discovered by SPECULOOS
Kunovac Hodžić, Vedad; Triaud, Amaury H. M. J.; Burgasser, Adam J. +18 more
Mass, radius and age are three of the most fundamental parameters for celestial objects, enabling insight into the evolution and internal physics of stars, brown dwarfs and planets. Brown dwarfs are hydrogen-rich objects that are unable to sustain core fusion reactions but are supported against collapse by electron degeneracy pressure1.…
Cometary Nuclei—From Giotto to Rosetta
Keller, Horst Uwe; Kührt, Ekkehard
We will briefly recapitulate the beginning of modern cometary physic. Then we will assess the results of the cometary flyby missions previous to ESA's Rosetta rendezvous with comet 67P/Churyumov-Gerasimenko. Emphasis is given to the physical properties of cometary nuclei. We will relate the results of the Rosetta mission to those of the flybys. A …
X-ray flares from the stellar tidal disruption by a candidate supermassive black hole binary
Shu, Xinwen; Jiang, Ning; Li, Shuo +8 more
Optical transient surveys have led to the discovery of dozens of stellar tidal disruption events (TDEs) by massive black hole in the centers of galaxies. Despite extensive searches, X-ray follow-up observations have produced no or only weak X-ray detections in most of them. Here we report the discovery of delayed X-ray brightening around 140 days …
The compact triply eclipsing triple star TIC 209409435 discovered with TESS
Huang, X.; Mitnyan, T.; Pál, A. +9 more
We report the discovery in TESS Sectors 3 and 4 of a compact triply eclipsing triple star system. TIC 209409435 is a previously unknown eclipsing binary with a period of 5.717 d, and the presence of a third star in an outer eccentric orbit of 121.872-d period was found from two sets of third-body eclipses and from eclipse timing variations. The la…
The discovery of radio halos in the frontier fields clusters Abell S1063 and Abell 370
Churazov, E.; Zitrin, A.; Lovisari, L. +13 more
Context. Massive merging galaxy clusters often host diffuse megaparsec-scale radio synchrotron emission. This emission originates from relativistic electrons in the ionized intracluster medium. An important question is how these synchrotron emitting relativistic electrons are accelerated.
Aims: Our aim is to search for diffuse emission in the…
Detection of the Strongest Magnetic Field in a Sunspot Light Bridge
Lagg, Andreas; Solanki, Sami K.; Castellanos Durán, J. S. +1 more
Traditionally, the strongest magnetic fields on the Sun have been measured in sunspot umbrae. More recently, however, much stronger fields have been measured at the ends of penumbral filaments carrying the Evershed and counter-Evershed flows. Superstrong fields have also been reported within a light bridge separating two umbrae of opposite polarit…
Discovery of a hot ultramassive rapidly rotating DBA white dwarf
Postnov, K. A.; Blinnikov, S. I.; Dodin, A. V. +6 more
We report the discovery of a nearby massive white dwarf with He-H atmosphere. The white dwarf is located at a distance of 74.5 ± 0.9-=pc. Its radius, mass, effective temperature, H/He ratio, and age are R = 2500 ± 100-=km, M = 1.33 ± 0.01-= $\rm M_{\odot }$ , Teff = 31-=200 ± 1200-=K, H/He ∼ 0.1, and 330 ± 40-=Myr, respectively. The obs…