Search Publications
Frequency Chirping of Electromagnetic Ion Cyclotron Waves in Earth's Magnetosphere
An, Zeyu; Tao, Xin; Zonca, Fulvio +1 more
Electromagnetic ion cyclotron (EMIC) waves are known to exhibit frequency chirping occasionally, contributing to the rapid acceleration and precipitation of energetic particles in the magnetosphere. However, the chirping mechanism of EMIC waves remains elusive. In this work, a phenomenological model of whistler mode chorus waves named the Trap-Rel…
Machine-learning applications for cataclysmic variable discovery in the ZTF alert stream
Copperwheat, C. M.; Darnley, M. J.; Mistry, D. +1 more
Cataclysmic variables (CV) encompass a diverse array of accreting white dwarf binary systems. Each class of CV represents a snapshot along an evolutionary journey, one with the potential to trigger a type Ia supernova event. The study of CVs offers valuable insights into binary evolution and accretion physics, with the rarest examples potentially …
IAS/CEA Evolution of Dust in Nearby Galaxies (ICED): The spatially-resolved dust properties of NGC4254
Berta, S.; Aussel, H.; Adam, R. +57 more
We present the first preliminary results of the project ICED, focusing on the face-on galaxy NGC4254. We use the millimetre maps observed with NIKA2 at lRAM-30m. as part of the IMEGIN Guaranteed Time Large Program. and of a wide collection of ancillary data (multi-wavelength photometry and gas phase spectral lines) that are publicly available. We …
Revisiting the Activity–Rotation Relation for Evolved Stars
Liu, Jifeng; Wang, Song; Li, Xue +2 more
The magnetic dynamo mechanism of giant stars remains an open question, which can be explored by investigating their activity–rotation relations with multiple proxies. By using the data from the LAMOST and Galaxy Evolution Explorer surveys, we carried out a comprehensive study of activity–rotation relations of evolved stars based on Ca II H and K l…
Stream Interaction Regions in the Minimum of Solar Cycles 23 and 24
Aguilar-Rodriguez, E.; Corona-Romero, P.; Gonzalez-Esparza, J. A. +1 more
Stream interaction regions (SIRs) dominate the large-scale solar wind dynamics during the minimum of the solar cycle. The interaction of SIRs with the magnetosphere causes most of geomagnetic storms during this epoch. We used in-situ solar wind observations at 1 AU to study 62 SIRs detected in the interval 2007-2008 (minimum of cycle 23) and 61 SI…
Unexpected increase of the deuterium to hydrogen ratio in the Venus mesosphere
Vandaele, Ann Carine; Robert, Séverine; Chamberlain, Sarah +14 more
Studying Venus's HDO and H2O sheds light on its water history. The HDO/H2O ratio in its bulk atmosphere, 120 times Earth's, suggests a significantly wetter past for Venus. Our study analyzes mesospheric (70 to 110 km) temperature, H2O, and HDO profiles taken in solar occultation by SOIR/Venus Express. We observe in…
Revising the Basal Permittivity of the South Polar Layered Deposits of Mars With a Surficial Dust Cover
Kofman, W.; Hérique, A.; Grima, C. +1 more
Bright basal reflections from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) have been proposed to be consistent with permittivities characteristic of a wet material beneath the south polar layered deposits (SPLD). The characterization of a recently formed impact crater highlight the existence of a several meters thick ice…
Detailed Study of Stars and Gas in a z = 8.3 Massive Merger with Extreme Dust Conditions
Harshan, Anishya; Tripodi, Roberta; Martis, Nicholas S. +15 more
We present galaxy MACS0416-Y1 at zspec = 8.312 as observed by the CAnadian NIRISS Unbiased Cluster Survey. MACS0416-Y1 has been shown to have extreme dust properties; thus, we study the physical properties and star formation histories of its resolved components. Overall, we find that MACS0416-Y1 is undergoing a star formation burst in t…
Optical polarimetry study of the Lambda-Orionis star-forming region
Neha, S.; Soam, A.; Maheswar, G.
We present an optical polarimetry study of the nearby star-forming region Lambda-Orionis to map the plane-of-the-sky magnetic field geometry to understand the magnetized evolution of the HII region and the associated small molecular clouds. We made multiwavelength polarization observations of 34 bright stars distributed across the region. We also …
The Magellan M2FS Spectroscopic Survey of High-redshift Galaxies: The Brightest Lyman-break Galaxies at z ∼ 6
Jiang, Linhua; Ning, Yuanhang; Pan, Zhiwei +2 more
We present a study of a sample of 45 spectroscopically confirmed, UV luminous galaxies at z ∼ 6. They were selected as bright Lyman-break galaxies (LBGs) using deep multiband optical images in more than 2 deg2 of the sky, and subsequently identified via their strong Lyα emission. The majority of these LBGs span an absolute UV magnitude …