Search Publications
A Mid-infrared Study of Directly Imaged Planetary-mass Companions Using Archival Spitzer/IRAC Images
Kraus, Adam L.; Martinez, Raquel A.
The atmospheres and accretion disks of planetary-mass and substellar companions provide an unprecedented look into planet and moon formation processes, most notably the frequency and lifetime of circumplanetary disks. In our ongoing effort to leverage the extraordinary sensitivity of the Spitzer/Infrared Array Camera (IRAC) at 3.6, 4.5, 5.8, and 8…
V392 Persei: A γ-ray bright nova eruption from a known dwarf nova
Boyd, D.; Starrfield, S.; Page, K. L. +57 more
V392 Persei is a known dwarf nova (DN) that underwent a classical nova eruption in 2018. Here we report ground-based optical, Swift UV and X-ray, and Fermi-LAT γ-ray observations following the eruption for almost three years. V392 Per is one of the fastest evolving novae yet observed, with a t2 decline time of 2 d. Early spectra present…
The VMC survey. XLV. Proper motion of the outer LMC and the impact of the SMC
de Grijs, Richard; Ripepi, Vincenzo; Cioni, Maria-Rosa L. +8 more
Context. The Large Magellanic Cloud (LMC) is the most luminous satellite galaxy of the Milky Way and, owing to its companion, the Small Magellanic Cloud (SMC), represents an excellent laboratory to study the interaction of dwarf galaxies.
Aims: The aim of this study is to investigate the kinematics of the outer regions of the LMC by using ste…
New Constraints on Cosmic Particle Populations at the Galactic Center Using X-Ray Observations of the Molecular Cloud Sagittarius B2
Zhang, Shuo; Clavel, Maïca; Perez, Kerstin +2 more
The Sagittarius B2 (Sgr B2) molecular cloud complex is an X-ray reflection nebula whose nonthermal X-ray emissions have continued to decrease since 2001 as it reprocesses one or more past energetic outbursts from the supermassive black hole Sagittarius A* at the Galactic Center. The X-ray reflection model explains the observed time variability of …
Acceleration and Expansion of a Coronal Mass Ejection in the High Corona: Role of Magnetic Reconnection
Temmer, Manuela; Lugaz, Noé; Zhuang, Bin +2 more
The important role played by magnetic reconnection in the early acceleration of coronal mass ejections (CMEs) has been widely discussed. However, as CMEs may have expansion speeds comparable to their propagation speeds in the corona, it is not clear whether and how reconnection contributes to the true acceleration and expansion separately. To addr…
On the Magnetosphere-Ionosphere Coupling During the May 2021 Geomagnetic Storm
Ubertini, P.; Battiston, R.; Plainaki, C. +20 more
On 12 May 2021 the interplanetary doppelgänger of the 9 May 2021 coronal mass ejection impacted the Earth's magnetosphere, giving rise to a strong geomagnetic storm. This paper discusses the evolution of the various events linking the solar activity to the Earth's ionosphere with special focus on the effects observed in the circumterrestrial envir…
VLT spectropolarimetry of comet 67P: dust environment around the end of its intense southern summer
Kolokolova, Ludmilla; Agarwal, Jessica; Snodgrass, Colin +5 more
Context. A cornucopia of Rosetta and ground-based observational data sheds light on the evolution of the characteristics of dust particles from comet 67P/Churyumov-Gerasimenko (hereafter 67P) with seasons, implying the different dust environments in the source regions on the surface of the comet.
Aims: We aim to constrain the properties of th…
A Long-period Pre-ELM System Discovered from the LAMOST Medium-resolution Survey
Liu, Jifeng; Bai, Yu; Gu, Wei-Min +16 more
We present LAMOST J041920.07+072545.4 (hereafter J0419), a close binary consisting of a bloated, extremely low mass pre-white dwarf (pre-ELM WD) and a compact object with an orbital period of 0.607189 days. The large-amplitude ellipsoidal variations and the evident Balmer and He I emission lines suggest a filled Roche lobe and ongoing mass transfe…
Evolution of Plasma Composition in an Eruptive Flux Rope
Long, D. M.; van Driel-Gesztelyi, L.; Démoulin, P. +8 more
Magnetic flux ropes are bundles of twisted magnetic field enveloping a central axis. They harbor free magnetic energy and can be progenitors of coronal mass ejections (CMEs). However, identifying flux ropes on the Sun can be challenging. One of the key coronal observables that has been shown to indicate the presence of a flux rope is a peculiar br…
Discrete Aurora on the Nightside of Mars: Occurrence Location and Probability
Luhmann, Janet; Fang, Xiaohua; Jakosky, Bruce +7 more
This paper represents the first attempt to predict the occurrence location and probability of discrete electron aurora on the nightside of Mars. We run a 3-D time-dependent magnetohydrodynamic model to characterize the spatial and temporal dynamics of magnetic field and plasma distributions over the course of one planetary rotation. We perform eig…