Search Publications
Proton Temperature Anisotropies in the Venus Plasma Environment During Solar Minimum and Maximum
Zhang, Tielong; Stenberg Wieser, Gabriella; Futaana, Yoshifumi +4 more
The proton population in Venus' plasma environment is characterized during periods of solar minimum and maximum using data from a particle mass-energy spectrometer. Such characterizations at different levels of solar activity provides physical insight into solar-cycle-dependent plasma phenomena around the planet, for example mirror modes in the ma…
Lessons from the Magellanic System and its modeling
Hammer, Francois; Wang, Jianling; Yang, Yanbin
The prominent Magellanic Stream that dominates the H I sky provides a tantalizing number of observations that potentially constrains the Magellanic Clouds and the Milky Way (MW) outskirts. Here we show that the 'ram-pressure plus collision' model naturally explain these properties, and is able to predict some of the most recent observations made a…
Measurement of redshift-space two- and three-point correlation of Lyα absorbers at 1.7 < z < 3.5: implications on evolution of the physical properties of IGM
Srianand, Raghunathan; Gaikwad, Prakash; Maitra, Soumak
We present redshift-space two-point (ξ), three-point (ζ), and reduced three-point (Q) correlation of Lyα absorbers (Voigt profile components having H I column density, NH I > 1013.5 cm-2) over three redshift bins spanning 1.7 < z < 3.5 using high-resolution spectra of 292 quasars. We detect posi…
SOFIA FEEDBACK Survey: PDR Diagnostics of Stellar Feedback in Different Regions of RCW 49
Schneider, N.; Stutzki, J.; Tielens, A. G. G. M. +13 more
We quantified the effects of stellar feedback in RCW 49 by determining the physical conditions in different regions using the [C II] 158 µm and [O I] 63 µm observations from SOFIA, the 12CO (3-2) observations from APEX, and the H2 line observations from Spitzer telescopes. Large maps of RCW 49 were observed with t…
Effects of flares on the habitable zones of M dwarfs accessible to TESS planet detections
Stelzer, B.; Raetz, Stefanie; Bogner, M.
Photometric space missions like Kepler and TESS continuously discover new exoplanets and advance the search for a second habitable world. The light curves recorded by these telescopes also reveal signs of magnetic activity, such as star spot modulation and flares, which can influence habitability. Searching for these characteristics, we analyzed T…
eROSITA study of the globular cluster 47 Tucanae
Sasaki, Manami; Bulbul, Esra; Becker, Werner +7 more
Aims: We present the results of the analysis of five observations of the globular clutser 47 Tucanae (47 Tuc) with the extended Roentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spektrum-Roentgen-Gamma (Spektr-RG, SRG). We study the X-ray population in the field of one of the most massive globular clusters in our Milky Wa…
A potential new phase of massive star formation. A luminous outflow cavity centred on an infrared quiet core
Schneider, N.; Bontemps, S.; Peretto, N. +4 more
Context. Due to the sparsity and rapid evolution of high-mass stars, a detailed picture of the evolutionary sequence of massive protostellar objects still remains to be drawn. Some of the early phases of their formation are so short that only a select number of objects throughout the Milky Way currently find themselves spending time in those phase…
Investigating the origin of gypsum in Olympia Undae: Characterizing the mineralogy of the basal unit
Mustard, J. F.; Das, E.; Tarnas, J. D. +2 more
The Olympia Undae sand sea contains the largest known deposit of gypsum discovered on the surface of Mars. The origin of this gypsum, a hydrated sulfate mineral requiring liquid water for its formation, remains largely unconstrained. We examine the hypothesis that gypsum was derived from the early-Amazonian aged Basal Unit, which is suggested to c…
Uniting the Sun's Hale magnetic cycle and "extended solar cycle" paradigms
McIntosh, Scott W.; Leamon, Robert J.; Scherrer, Philip H. +1 more
Through meticulous daily observation of the Sun's large-scale magnetic field the Wilcox Solar Observatory (WSO) has catalogued two magnetic (Hale) cycles of solar activity. Those two (∼22-year long) Hale cycles have yielded four (∼11-year long) sunspot cycles (numbers 21 through 24). Recent research has highlighted the persistence of the "Extended…
Could the Magnetic Star HD 135348 Possess a Rigidly Rotating Magnetosphere?
Gagliano, Robert; Jayaraman, Rahul; Ricker, George R. +5 more
We report the detection and characterization of a new magnetospheric star, HD 135348, based on photometric and spectropolarimetric observations. The TESS light curve of this star exhibited variations consistent with stars known to possess rigidly rotating magnetospheres (RRMs), so we obtained spectropolarimetric observations using the Robert Stobi…