Search Publications
Triangulation of Hard X-Ray Sources in an X-Class Solar Flare with ASO-S/HXI and Solar Orbiter/STIX
Massa, Paolo; Krucker, Säm; Chen, Wei +4 more
HXI on ASO-S and STIX onboard Solar Orbiter are the first simultaneously operating solar hard X-ray imaging spectrometers. ASO-S's low Earth orbit and Solar Orbiter's periodic displacement from the Sun–Earth line enables multi-viewpoint solar hard X-ray spectroscopic imaging analysis for the first time. Here, we demonstrate the potential of this n…
Near-mid infrared spectroscopy of carbonaceous chondrites: Insights into spectral variation due to aqueous alteration and thermal metamorphism in asteroids
Zhao, Haibin; Cloutis, Edward A.; Yu, Jinfei +2 more
Carbonaceous chondrites (CCs) are windows into the early Solar System and the histories of their parent bodies. Their infrared spectral signatures are powerful proxies for deciphering their composition and evolution history, but still present formidable challenges in relation to determining the degree of secondary processing such as aqueous altera…
Searching for Short-period Variables in M31: Method and Catalogs
Fan, Zhou; Huang, Yang; Ren, Yi +6 more
Utilizing high-cadence and continuous g- and r-band data over three nights acquired from the 3.6 m Canada–France–Hawaii Telescope, aiming to find short-duration microlensing events, we conduct a systematic search for variables, transients, and asteroids across a ∼1° field of view of the Andromeda galaxy (M31). We present a catalog of 5859 variable…
The Discovery and Evolution of a Possible New Epoch of Cometary Activity by the Centaur (2060) Chiron
Fedorets, Grigori; Siverd, Robert J.; Schwamb, Megan E. +24 more
Centaurs are small solar system objects on chaotic orbits in the giant planet region, forming an evolutionary continuum with the Kuiper Belt objects and Jupiter-family comets. Some Centaurs are known to exhibit cometary activity, though unlike comets, this activity tends not to correlate with heliocentric distance, and the mechanism behind it is c…
Metallicity Mapping of the Ionized Diffuse Gas at the Milky Way Disk–Halo Interface
Prochaska, J. Xavier; Strader, Jay; Putman, Mary E. +5 more
Metals in the diffuse, ionized gas at the boundary between the Milky Way's interstellar medium (ISM) and circumgalactic medium, known as the disk–halo interface (DHI), are valuable tracers of the feedback processes that drive the Galactic fountain. However, metallicity measurements in this region are challenging due to obscuration by the Milky Way…
GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc
Hellier, Coel; Stassun, Keivan G.; Howell, Steve B. +30 more
We report the discovery of the transiting planet GJ 238 b, with a radius of 0.566 ± 0.014 R ⊕ (1.064 ± 0.026 times the radius of Mars) and an orbital period of 1.74 days. The transit signal was detected by the TESS mission and designated TOI-486.01. The star's position close to the southern ecliptic pole allows for almost continuous obs…
The Solar Origin of an Intense Geomagnetic Storm on 1 December 2023: Successive Slipping and Eruption of Multiple Magnetic Flux Ropes
Hou, Yijun; Li, Ting; Feng, Li +12 more
The solar eruption that occurred on 28 November 2023 (SOL2023-11-28) triggered an intense geomagnetic storm on 1 December 2023. The associated terrestrial auroras manifested at the most southern latitudes in the northern hemisphere observed in the past two decades. In order to explore the profound geoeffectiveness of this event, we conducted a com…
A sample of 554 white dwarfs showing infrared excess from Gaia EDR3 and CatWISE catalogs
Xu, Siyi; Kissler-Patig, Markus; Bonsor, Amy +1 more
Context. White dwarfs (WDs) are generally intrinsically faint in the infrared (IR). Excess emission in the infrared results from low-mass companions or dusty material, potentially linked to the on-going accretion of planetary material.
Aims: This work presents a new catalog of white dwarfs with (candidate) infrared excess.
Methods: The f…
Parsec-scale evolution of the gigahertz-peaked spectrum quasar PKS 0858 - 279
Kovalev, Y. Y.; Perucho, M.; Kosogorov, N. A. +1 more
We conducted multi-epoch, multifrequency parsec-scale studies on the gigahertz-peaked spectrum quasar PKS 0858 - 279 with the Very Long Baseline Array (VLBA). Our observations on 2005 November 26 elucidated a weak core, characterized by an inverted spectrum, and a distinctly bent jet that exhibited a notable bright feature in its Stokes I emission…
Advancements in the 3D shape reconstruction of Phobos: An analysis of shape models and future exploration directions
Willner, Konrad; Chen, Min; Huang, Xianfeng +4 more
Aims: Our research focuses on developing a high-precision and relatively high-resolution shape model of Phobos.
Methods: We employed advanced photogrammetric techniques combined with novel computer vision methods to reconstruct the 3D shape of Phobos from nearly 900 Mars Express/SRC and Viking Orbiter images. This research also involved …