Search Publications
Sausage, kink, and fluting magnetohydrodynamic wave modes identified in solar magnetic pores by Solar Orbiter/PHI
Woch, J.; Solanki, S. K.; Schou, J. +25 more
Solar pores are intense concentrations of magnetic flux that emerge through the solar photosphere. When compared to sunspots, they are much smaller in diameter and can therefore be affected and buffeted by neighbouring granular activity to generate significant magnetohydrodynamic (MHD) wave energy flux within their confines. However, observations …
Dark No More: The Low-luminosity Stellar Counterpart of a Dark Cloud in the Virgo Cluster
Janowiecki, Steven; Sand, David J.; Jones, Michael G. +9 more
We have discovered the stellar counterpart to the ALFALFA Virgo 7 cloud complex, which has been thought to be optically dark and nearly star-free since its discovery in 2007. This ∼190 kpc long chain of enormous atomic gas clouds (M H I ∼ 109 M ⊙) is embedded in the hot intracluster medium of the Virgo galaxy clus…
An Optical Search for New Outbursting Low Mass X-Ray Binaries
Clarkson, William I.; Riddle, Reed; Rusholme, Ben +5 more
Transient low-mass X-ray binaries (LMXBs) are discovered largely by X-ray and gamma-ray all-sky monitors. The X-ray outburst is also accompanied by an optical brightening, which empirically can precede the detection of X-rays. Newly sensitive optical synoptic surveys may offer a complementary pathway for discovery and potential for insight into th…
Hints of a disrupted binary dwarf galaxy in the Sagittarius stream
Belokurov, Vasily; Monty, Stephanie; Davies, Elliot Y. +1 more
In this work, we look for evidence of a non-unity mass ratio binary dwarf galaxy merger in the Sagittarius stream. Simulations of such a merger show that, upon merging with a host, particles from the less massive galaxy will often mostly be found in the extended stream and less so in the central remnant. Motivated by these simulations, we use the …
GOALS-JWST: Constraining the Emergence Timescale for Massive Star Clusters in NGC 3256
Inami, Hanae; Böker, Torsten; Lenkić, Laura +28 more
We present the results of a James Webb Space Telescope NIRCam and NIRSpec investigation into the young massive star cluster (YMC) population of NGC 3256, the most cluster-rich luminous infrared galaxy in the Great Observatories All Sky LIRG Survey. We detect 3061 compact YMC candidates with a signal-to-noise ratio ≥3 at F150W, F200W, and F335M. Ba…
Implications of the discovery of AF Lep b. The mass-luminosity relation for planets in the β Pic Moving Group and the L-T transition for young companions and free-floating planets
D'Orazi, V.; Zurlo, A.; Desidera, S. +7 more
Context. Dynamical masses of young planets aged between 10 and 200 Myr detected in imaging play a crucial role in shaping models of giant planet formation. Regrettably, only a few such objects possess these characteristics. Furthermore, the evolutionary pattern of young sub-stellar companions in near-infrared colour-magnitude diagrams might diverg…
A Census of the β Pic Moving Group and Other Nearby Associations with Gaia
Luhman, K. L.
I have used the third data release of the Gaia mission to improve the reliability and completeness of membership samples in the β Pic moving group (BPMG) and other nearby associations with ages of 20–50 Myr (Sco Body, Carina, Columba, χ 1 For, Tuc-Hor, IC 2602, IC 2391, NGC 2547). I find that Carina, Columba, and χ 1 For are …
Time Evolution Images of the Hypergiant RW Cephei during the Rebrightening Phase Following the Great Dimming
Gies, Douglas R.; Mérand, Antoine; Monnier, John D. +17 more
Stars with initial masses larger than 8 M ⊙ undergo substantial mass loss through mechanisms that remain elusive. Unraveling the origins of this mass loss is important for comprehending the evolutionary path of these stars, the type of supernova explosion, and whether they become neutron stars or black hole remnants. In 2022 December, R…
Spectroscopic variability of massive pre-main-sequence stars in M17
Kaper, L.; de Koter, A.; van Gelder, M. L. +4 more
Context. It is a challenge to study the formation process of massive stars: their formation time is short, there are only few of them, they are often deeply embedded, and they lie at relatively large distances. Our strategy is to study the outcome of the star formation process and to search for signatures that remain of the formation. We have acce…
Confronting compositional confusion through the characterization of the sub-Neptune orbiting HD 77946
Van Eylen, V.; Vanderburg, A.; Sozzetti, A. +29 more
We report on the detailed characterization of the HD 77946 planetary system. HD 77946 is an F5 (M* = 1.17 M⊙, R* = 1.31 R⊙) star, which hosts a transiting planet recently discovered by NASA's Transiting Exoplanet Survey Satellite (TESS), classified as TOI-1778 b. Using TESS photometry, high-resolution sp…