Search Publications
The Unmixed Debris of Gaia-Sausage/Enceladus in the Form of a Pair of Halo Stellar Overdensities
Chiappini, Cristina; Limberg, Guilherme; Rossi, Silvia +5 more
In the first billion years after its formation, the Galaxy underwent several mergers with dwarf satellites of various masses. The debris of Gaia-Sausage/Enceladus (GSE), the galaxy responsible for the last significant merger of the Milky Way, dominates the inner halo and has been suggested to be the progenitor of both the Hercules-Aquila Cloud (HA…
A new method for finding nearby white dwarfs exoplanets and detecting biosignatures
Vanderburg, Andrew; Lustig-Yaeger, Jacob; Stevenson, Kevin B. +5 more
We demonstrate that the James Webb Space Telescope (JWST) can detect infrared (IR) excess from the blended light spectral energy distribution of spatially unresolved terrestrial exoplanets orbiting nearby white dwarfs. We find that JWST is capable of detecting warm (habitable-zone; Teq = 287 K) Earths or super-Earths and hot (400-1000 K…
XXL-HSC: Link between AGN activity and star formation in the early Universe (z ⩾ 3.5)
Paltani, S.; Pierre, M.; Vignali, C. +11 more
In this work, our aim is to investigate the star formation rate (SFR) of the host galaxies of active galactic nuclei (AGNs) in the early Universe. To this end, we constructed a sample of 149 luminous (L2 − 10 keV > 1044 erg s−1) X-ray AGNs at z ≥ 3.5 selected in three fields with different depths and observed ar…
Discovery of Three Candidate Magnetar-powered Fast X-Ray Transients from Chandra Archival Data
Berger, Edo; Lin, Dacheng; Irwin, Jimmy A. +1 more
It was proposed that a remnant stable magnetar could be formed in a binary neutron-star merger, leading to a fast X-ray transient (FXT) that can last for thousands of seconds. Recently, Xue et al. suggested that CDF-S XT2 was exactly such a kind of source. If confirmed, such emission can be used to search for electromagnetic counterparts to gravit…
The Kiloparsec-scale Neutral Atomic Carbon Outflow in the Nearby Type 2 Seyfert Galaxy NGC 1068: Evidence for Negative AGN Feedback
Tamura, Yoichi; Kohno, Kotaro; Schinnerer, Eva +13 more
Active galactic nucleus (AGN) feedback is postulated as a key mechanism for regulating star formation within galaxies. Studying the physical properties of the outflowing gas from AGNs is thus crucial for understanding the coevolution of galaxies and supermassive black holes. Here we report 55 pc resolution ALMA neutral atomic carbon [C I] 3
Geometry and Segmentation of Cerberus Fossae, Mars: Implications for Marsquake Properties
Rodriguez, S.; Hauber, E.; Lognonné, P. +9 more
The NASA InSight mission to Mars successfully landed on 26 November 2018 in Elysium Planitia. It aims to characterize the seismic activity and aid in the understanding of the internal structure of Mars. We focus on the Cerberus Fossae region, a giant fracture network ∼1,200 km long situated east of the InSight landing site where M ∼3 marsquakes we…
The impact of a massive Sagittarius dSph on GD-1-like streams
Price-Whelan, Adrian M.; Belokurov, Vasily; Evans, N. Wyn +1 more
We investigate the effects of a massive ($\gtrsim 4\times 10^{10}\, \mathrm{M}_\odot$) Sagittarius dwarf spheroidal galaxy (Sgr) on stellar streams using test particle simulations in a realistic Milky Way potential. We find that Sgr can easily disrupt streams formed more than ~3 Gyr ago, while stars stripped more recently are generally unaffected.…
Thermal Instability-Induced Fundamental Magnetic Field Strands in the Solar Corona
Antolin, Patrick; Martínez-Sykora, Juan; Şahin, Seray
Thermal instability is a fundamental process of astrophysical plasmas. It is expected to occur whenever the cooling is dominated by radiation and cannot be compensated for by heating. In this work, we conduct 2.5D radiation MHD simulations with the Bifrost code of an enhanced activity network in the solar atmosphere. Coronal loops are produced sel…
Milky Way Thin and Thick Disk Kinematics with Gaia EDR3 and RAVE DR5
Girard, Terrence M.; Vieira, Katherine; Carraro, Giovanni +3 more
We present a detailed analysis of kinematics of the Milky Way disk in the solar neighborhood using the Gaia DR3 catalog. To determine the local kinematics of the stellar disks of the Milky Way we use a complete sample of 278,228 red giant branch (RGB) stars distributed in a cylinder, centered at the Sun with a 1 kpc radius and half-height of 0.5 k…
The Plasma Environment of Comet 67P/Churyumov-Gerasimenko
Henri, Pierre; Feldman, Paul D.; Simon Wedlund, Cyril +24 more
The environment of a comet is a fascinating and unique laboratory to study plasma processes and the formation of structures such as shocks and discontinuities from electron scales to ion scales and above. The European Space Agency's Rosetta mission collected data for more than two years, from the rendezvous with comet 67P/Churyumov-Gerasimenko in …