Search Publications
The corona of a fully convective star with a near-polar flare
Stelzer, B.; Poppenhäger, K.; Ilin, E. +1 more
Context. In 2020, the Transiting Exoplanet Survey Satellite (TESS) observed a rapidly rotating M7 dwarf, TIC 277539431, producing a flare at 81° latitude, the highest latitude flare located to date. This is in stark contrast to solar flares that occur much closer to the equator, typically below 30°. The mechanisms that allow flares at high latitud…
Variation in the intensity ratio at each wavelength point of the Si IV 1394/1403 Å lines: Spectral diagnostics of a bifurcated eruption
Xu, Zhe; Xue, Zhike; Yan, Xiaoli +3 more
Aims. This study aims to investigate the deviation of the intensity ratio of the Si IV 1394 Å and 1403 Å emission lines from the expected value of 2 in the optically thin regime, as has been observed in many recent studies. Methods. We analyzed the integrated intensity ratio (R) and the wavelength-dependent ratio (r(Δλ)) in a small bifurcated erup…
MOSEL survey: Unwrapping the Epoch of Reionisation through mimic galaxies at Cosmic Noon
Harshan, Anishya; Gupta, Anshu; Trott, Cathryn M. +4 more
The nature of the first galaxies that reionised the universe during the Epoch of Reionisation (EoR) remains unclear. Attempts to directly determine spectral properties of these early galaxies are affected by both limited photometric constraints across the spectrum and by the opacity of the intergalactic medium to the Lyman Continuum (LyC) at high …
Two Young Eclipsing Binaries in Orion with Temperatures and Radii Affected by Spots and Third Bodies
Stassun, Keivan G.; Kounkel, Marina
In this work we present a model of two young eclipsing binaries in the Orion complex. Both heavily spotted, they present radii and temperatures that are in disagreement with the predictions of standard stellar models. 2M05‑06 consists of two stars with different masses (∼0.52 and ∼0.42 M ⊙) but with very similar radii (∼0.9 R ⊙
Analysis of faults and pit chains in Noctis Labyrinthus: Implications for early extension and possible magmatic plumbing
Sefton-Nash, Elliot; De Marchi, Guido; D'Incecco, Piero +10 more
Noctis Labyrinthus has been a region of disputed origin due to its complexity and poor understanding of how various processes and mechanisms may have combined to form it. The surface is an integrated record of intensive tectonic activity expressed by a multiple extended sets of dip-slip faults oriented in different directions, and thought to have …
The deep eclipses of RW Aur revisited by long-term photometric and spectroscopic monitoring
Mugrauer, Markus; Lux, Oliver; Bischoff, Richard
RW Aurigae is a young stellar system containing a classical T Tauri star as the primary component. It shows deep, irregular dimmings, first detected in 2010. At the University Observatory Jena, we carried out optical follow-up observations. We performed multiband (BVRI) photometry of the system with the Cassegrain-Teleskop-Kamera II and the Schmid…
HX Velorum: Ellipsoidal/Rotational Binary With β Cep Type Component
Gürol, B.
We present the Transiting Exoplanet Survey Satellite (TESS) light curve analysis of HX Velorum, located in the Southern Hemisphere, where one of the components is found for the first time to be a β$$ \beta $$ Cep (BCEP) type pulsator. The TESS observations of HX Velorum were published in a total of 6 sectors. Fourier analysis of the observations r…
The TESS–Keck Survey. XIX. A Warm Transiting Sub-Saturn-mass Planet and a Nontransiting Saturn-mass Planet Orbiting a Solar Analog
Batalha, Natalie M.; Bieryla, Allyson; Latham, David W. +45 more
The Transiting Exoplanet Survey Satellite (TESS) continues to increase dramatically the number of known transiting exoplanets, and is optimal for monitoring bright stars amenable to radial velocity (RV) and atmospheric follow-up observations. TOI-1386 is a solar-type (G5V) star that was detected via TESS photometry to exhibit transit signatures in…
New Anisotropic Cosmic-Ray Enhancement (ACRE) Event on 5 November 2023 Due to Complex Heliospheric Conditions
Larsen, Nicholas; Gil, Agnieszka; Usoskin, Ilya +2 more
The variability of galactic cosmic rays near Earth is nearly isotropic and driven by large-scale heliospheric modulation but rarely can very local anisotropic events be observed in low-energy cosmic rays. These anisotropic cosmic-ray enhancement (ACRE) events are related to interplanetary transients. Until now, two such events have been known. Her…
Herschel investigation of cores and filamentary structures in L1251 located in the Cepheus flare
Soam, Archana; Zhang, Guo-Yin; Dewan, Divyansh +3 more
Molecular clouds are the prime locations of star formation. These clouds contain filamentary structures and cores which are crucial in the formation of young stars. In this work, we aim to quantify the physical properties of structural characteristics within the molecular cloud L1251 to better understand the initial conditions for star formation. …