Search Publications
DEATHSTAR: a system for confirming planets and identifying false-positive signals in TESS data using ground-based time-domain surveys
Vanderburg, Andrew; Collins, Karen A.; Burdge, Kevin +3 more
We present a technique for verifying or refuting exoplanet candidates from the Transiting Exoplanet Survey Satellite (TESS) mission by searching for nearby eclipsing binary stars using higher resolution archival images from ground-based telescopes. Our new system is called Detecting and Evaluating A Transit: finding its Hidden Source in Time-domai…
Surface Flux Transport Modeling Using Physics-informed Neural Networks
Cheung, Mark C. M.; Athalathil, Jithu J.; Vaidya, Bhargav +2 more
Studying the magnetic field properties on the solar surface is crucial for understanding the solar and heliospheric activities, which in turn shape space weather in the solar system. Surface flux transport (SFT) modeling helps us to simulate and analyze the transport and evolution of magnetic flux on the solar surface, providing valuable insights …
Two waves of massive stars running away from the young cluster R136
Sana, Hugues; Mahy, Laurent; Kaper, Lex +10 more
Massive stars are predominantly born in stellar associations or clusters1. Their radiation fields, stellar winds and supernovae strongly impact their local environment. In the first few million years of a cluster's life, massive stars are dynamically ejected and run away from the cluster at high speed2. However, the productio…
Deep Chandra Observations of A2495: A Possible Sloshing-regulated Feedback Cycle in a Triple-offset Galaxy Cluster
Gastaldello, F.; Gaspari, M.; O'Sullivan, E. +6 more
We present the analysis of new, deep Chandra observations (130 ks) of the galaxy cluster A2495. This object is known for the presence of a triple offset between the peaks of the intracluster medium (ICM), the brightest cluster galaxy (BCG), and the warm gas glowing in Hα line. The new Chandra data confirm that the X-ray emission peak is located at…
Connecting Solar Wind Velocity Spikes Measured by Solar Orbiter and Coronal Brightenings Observed by SDO
Sorriso-Valvo, Luca; Verscharen, Daniel; D'Amicis, Raffaella +28 more
The Parker Solar Probe's discovery that magnetic switchbacks and velocity spikes in the young solar wind are abundant has prompted intensive research into their origin(s) and formation mechanism(s) in the solar atmosphere. Recent studies, based on in situ measurements and numerical simulations, argue that velocity spikes are produced through inter…
An HST Study of the Substellar Population of NGC 2024
Da Rio, Nicola; Gennaro, Mario; Sabbi, Elena +6 more
We performed an HST/WFC3-IR imaging survey of the young stellar cluster NGC 2024 in three filters probing the 1.4 µm H2O absorption feature, characteristic of the population of low-mass and substellar-mass objects down to a few Jupiter masses. We detect 812 point sources, 550 of them in all three filters with signal-to-noise ratio…
Stellar occultations by trans-Neptunian objects
Sicardy, Bruno; Buie, Marc W.; Braga-Ribas, Felipe +2 more
Stellar occultations provide a powerful tool to explore objects of the outer solar system. The Gaia mission now provides milli-arcsec accuracy on the predictions of these events and makes possible observations that were previously unthinkable. Occultations return kilometric accuracies on the three-dimensional shape of bodies irrespective of their …
Imaging polarimetry of comet 67 P/Churyumov-Gerasimenko: homogeneous distribution of polarization and its implications
Kolokolova, Ludmilla; Moreno, Fernando; Snodgrass, Colin +8 more
Comet 67P/Churyumov-Gerasimenko (67P) become observable for the first time in 2021 since the Rosetta rendezvous in 2014-2016. Here, we present pre-perihelion polarimetric measurements of 67P from 2021 performed with the Very Large Telescope (VLT), as well as post-perihelion polarimetric measurements from 2015 to 2016 obtained with the VLT and the …
BASS: XLIII. Optical, UV, and X-ray emission properties of unobscured Swift/BAT active galactic nuclei
Ueda, Yoshihiro; Kawamuro, Taiki; Ricci, Claudio +19 more
We present one of the largest multiwavelength studies of simultaneous optical-to-X-ray spectral energy distributions (SEDs) of unobscured (NH < 1022 cm‑2) active galactic nuclei (AGN) in the local Universe. Using a representative sample of hard-X-ray-selected AGN from the 70-month Swift/BAT catalog, with optical…
NSCs from groups to clusters: a catalogue of dwarf galaxies in the Shapley supercluster and the role of environment in galaxy nucleation
Chies-Santos, Ana L.; Blakeslee, John P.; Sánchez-Janssen, Rubén +2 more
Nuclear star clusters (NSCs) are dense star clusters located at the centre of galaxies spanning a wide range of masses and morphologies. Analysing NSC occupation statistics in different environments provides an invaluable window into investigating early conditions of high-density star formation and mass assembly in clusters and group galaxies. We …