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Paleolakes in the Northwest Hellas Region, Mars: Implications for the Regional Geologic History and Paleoclimate
Xiao, Long; Glotch, Timothy D.; Zhao, Jiannan
Hellas basin is one of the largest and oldest impact basins on the Martian surface. Its surrounding highland regions have undergone complicated geologic processes after the formation of Hellas basin. However, the geologic and climatic histories of the highlands surrounding Hellas are still unclear. Paleolakes provide us clues to answer these quest…
Statistical Analysis of the Relation between Coronal Mass Ejections and Solar Energetic Particles
Yashiro, Seiji; Nitta, Nariaki V.; Ichimoto, Kiyoshi +4 more
To improve the forecasting capability of impactful solar energetic particle (SEP) events, the relation between coronal mass ejections (CMEs) and SEP events needs to be better understood. Here we present a statistical study of SEP occurrences and timescales with respect to the CME source locations and speeds, considering all 257 fast (vCME
Optical interferometry and Gaia measurement uncertainties reveal the physics of asymptotic giant branch stars
Schultheis, M.; Millour, F.; Chiavassa, A. +20 more
Context. Asymptotic giant branch (AGB) stars are cool luminous evolved stars that are well observable across the Galaxy and populating Gaia data. They have complex stellar surface dynamics, which amplifies the uncertainties on stellar parameters and distances.
Aims: On the AGB star CL Lac, it has been shown that the convection-related variabi…
Cloud Atlas: Unraveling the Vertical Cloud Structure with the Time-series Spectrophotometry of an Unusually Red Brown Dwarf
Schneider, Glenn; Apai, Dániel; Marley, Mark +8 more
Rotational modulations of emission spectra in brown dwarf and exoplanet atmospheres show that clouds are often distributed non-uniformly in these ultracool atmospheres. The spatial heterogeneity in cloud distribution demonstrates the impact of atmospheric dynamics on cloud formation and evolution. In this study, we update the Hubble Space Telescop…
Investigation of Coronal Properties of X-Ray Bright G-dwarf Stars Based on the Solar Surface Magnetic Field-Corona Relationship
Takasao, Shinsuke; Mitsuishi, Ikuyuki; Ishihara, Daisuke +4 more
We investigated the coronal properties of G-dwarf stars including the Sun over a wide range of X-ray luminosity LX (3 × 1026 to 2 × 1030 erg s-1). We analyzed the archival data of 10 X-ray bright (LX > 1028 erg s-1) G-dwarf stars to derive their emission measure (EM) a…
Rotation and spots in normal A and Am/Fm stars
Joshi, Santosh; De Cat, Peter; Trust, Otto +1 more
Frequency analysis of long-term ultraprecise photometry can lead to precise values of rotation frequencies of rotating stars with `hump and spike' features in their periodograms. Using these features, we computed the rotation frequencies and amplitudes. The corresponding equatorial rotational velocity (V_{{rot}}) and spot size were estimated. On f…
Molecular gas and star formation activity in luminous infrared galaxies in clusters at intermediate redshifts
Arnaud, M.; Jablonka, P.; Krips, M. +10 more
We investigate the role of dense megaparsec-scale environments in processing molecular gas of cluster galaxies as they fall into the cluster cores. We selected a sample of ∼20 luminous infrared galaxies (LIRGs) belonging to intermediate-redshift clusters, mainly from the Herschel Lensing Survey and the Local Cluster Substructure Survey. These gala…
Cosmology with the submillimetre galaxies magnification bias: Proof of concept
Bonavera, L.; González-Nuevo, J.; Migliaccio, M. +6 more
Context. As recently demonstrated, high-z submillimetre galaxies (SMGs) are the perfect background sample for tracing the mass density profiles of galaxies and clusters (baryonic and dark matter) and their time-evolution through gravitational lensing. Their magnification bias, a weak gravitational lensing effect, is a powerful tool for constrainin…
The ancient main-sequence solar proxy HIP 102152 unveils the activity and rotational fate of our Sun
Meléndez, Jorge; Lorenzo-Oliveira, Diego; Ponte, Geisa +1 more
We present a detailed analysis of the possible future Sun's rotational evolution scenario based on the 8-Gyr-old solar twin HIP 102152. Using HARPS high-cadence observations (and TESS light curves), we analysed the modulation of a variety of activity proxies (Ca II, H I Balmer, and Na I lines), finding a strong rotational signal of 35.7 ± 1.4 d (l…
The Pre-He White Dwarfs in Eclipsing Binaries. I. WASP 0131+28
Koo, Jae-Rim; Hong, Kyeongsoo; Lee, Jae Woo +1 more
We report the first BV light curves and high-resolution spectra of the post-mass transfer binary star WASP 0131+28 to study the absolute properties of extremely low-mass white dwarfs. From the observed spectra, the double-lined radial velocities were derived, and the effective temperature and rotational velocity of the brighter, more massive prima…