Search Publications
The Fate of the Interstellar Medium in Early-type Galaxies. II. Observational Evidence for Morphological Quenching
Michałowski, M. J.; Hjorth, J.; Gall, C. +4 more
The mechanism by which galaxies stop forming stars and get rid of their interstellar medium (ISM) remains elusive. Here, we study a sample of more than 2000 elliptical galaxies in which dust emission has been detected. This is the largest sample of such galaxies ever analyzed. We infer the timescale for removal of dust in these galaxies and invest…
First polar observations of the fast solar wind with the Metis - Solar Orbiter coronagraph: Role of 2D turbulence energy dissipation in the wind acceleration
Heinzel, P.; Sasso, C.; Romoli, M. +33 more
Context. The fast solar wind is known to emanate from polar coronal holes.
Aims: This Letter reports the first estimate of the expansion rate of polar coronal flows performed by the Metis coronagraph on board Solar Orbiter.
Methods: By exploiting simultaneous measurements in polarized white light and ultraviolet intensity of the neutral …
TOI-1670 c, a 40 day Orbital Period Warm Jupiter in a Compact System, Is Well Aligned
Mahadevan, Suvrath; Rice, Malena; Wright, Jason T. +21 more
We report the measurement of the sky-projected obliquity angle λ of the warm Jovian exoplanet TOI-1670 c via the Rossiter-McLaughlin effect. We observed the transit window during UT 2023 April 20 for 7 continuous hours with NEID on the 3.5 m WIYN Telescope at Kitt Peak National Observatory. TOI-1670 hosts a sub-Neptune (P ~ 11 days; planet b) inte…
The existence of hot X-ray onsets in solar flares
Krucker, Säm; Veronig, Astrid M.; Dickson, Ewan C. M. +9 more
Context. It is well known among the scientific community that solar flare activity often begins well before the main impulsive energy release. However, a consistent explanation for this phenomenon has not yet been established.
Aims: Our aim is to investigate the earliest phase of four distinct flares observed by Solar Orbiter/STIX and determi…
Multi-campaign asteroseismic analysis of eight solar-like pulsating stars observed by the K2 mission
García, R. A.; Pérez Hernández, F.; Mathur, S. +11 more
The NASA K2 mission that succeeded the nominal Kepler mission observed several hundred thousand stars during its operations. While most of the stars were observed in single campaigns of ∼80 days, some of them were targeted for more than one campaign. We perform an asteroseismic study of a sample of eight solar-like stars observed during K2 Campaig…
Far-ultraviolet Spectroscopy of Active Galactic Nuclei with ASTROSAT/UVIT
Papadakis, I. E.; Singh, K. P.; Dewangan, G. C. +4 more
We study accretion disk emission from eight Seyfert 1-1.5 active galactic nuclei (AGN) using far-ultraviolet (FUV) (1300-1800 Å) slitless grating spectra acquired with AstroSat/UVIT. We correct for the Galactic and intrinsic extinction, contamination from the host galaxies, narrow and broad-line regions, Fe II emission, and Balmer continuum, and d…
Hazy with a Chance of Star Spots: Constraining the Atmosphere of Young Planet K2-33b
Vanderburg, Andrew; Mann, Andrew W.; Irwin, Jonathan M. +10 more
Although all-sky surveys have led to the discovery of dozens of young planets, little is known about their atmospheres. Here, we present multiwavelength transit data for the super-Neptune sized exoplanet, K2-33b-the youngest (~10 Myr) transiting exoplanet to date. We combined photometric observations of K2-33 covering a total of 33 transits spanni…
Spectroscopic Orbits of Subsystems in Multiple Stars. X (Summary)
Tokovinin, Andrei
Results of a large program of spectroscopic monitoring of nearby solar-type stellar hierarchical systems using the CHIRON echelle spectrograph at the 1.5 m telescope are summarized. Ten papers of this series contain 102 spectroscopic orbits and substantially contribute to the knowledge of periods and eccentricties, providing input for the study of…
Tilted discs in six poorly studied cataclysmic variables
Stefanov, Stefan Y.; Stefanov, Atanas K.
In this work, we search for negative superhumps (nSHs) in poorly studied cataclysmic variables using Transiting Exoplanet Survey Satellite data. We find three eclipsing binaries with nSH signatures: HBHA 4204-09, Gaia DR3 5931071148325476992, and SDSS J090113.51+144704.6. The last one exhibits IW And-like behaviour in archival Zwicky Transient Fac…
On the General Correlation between 3D Solar Wind Speed and Density Model and Solar Proxies
Bzowski, M.; Tokumaru, M.; Porowski, C.
The solar wind (SW) is a supersonic outflow of plasma from the solar corona, with the latitudinal speed and density profiles varying with the solar activity. The SW protons charge exchange with the inflowing interstellar neutral atoms and create energetic neutral atoms (ENAs), which bring information on the physical state of the plasma within the …