Search Publications
Glacial landscape and paleoglaciation in Terra Sabaea: Evidence for a 3.6 Ga polythermal plateau ice cap
Costard, François; Bouley, Sylvain; Bouquety, Axel +2 more
In a previous study, we demonstrated with a comparative morphometrical analysis the first morphometric evidence of a glacial landscape composed of glacial cirques and glacial valleys in the south of Terra Sabaea at an elevation > 1000 m in two impact craters and one mountain. The purpose of this study is to use the same method to seek other geo…
Magnetic Connectivity between the Light Bridge and Penumbra in a Sunspot
Feng, Song; Nakariakov, Valery M.; Yuan, Ding +2 more
A light bridge is a prominent structure commonly observed within a sunspot. Its presence usually triggers a wealth of dynamics in a sunspot and has a lasting impact on sunspot evolution. However, the fundamental structure of light bridges is still not well understood. In this study, we used the high-resolution spectropolarimetry data obtained by t…
Magnetic Inflation and Stellar Mass. V. Intensification and Saturation of M-dwarf Absorption Lines with Rossby Number
Muirhead, Philip S.; Mann, Andrew W.; Newton, Elisabeth R. +2 more
In young Sun-like stars and field M-dwarf stars, chromospheric and coronal magnetic activity indicators such as Hα, X-ray, and radio emission are known to saturate with low Rossby number (Ro ≲ 0.1), defined as the ratio of rotation period to convective turnover time. The mechanism for the saturation is unclear. In this paper, we use photospheric T…
A Multiwavelength Study of PSR J1119-6127 after 2016 Outburst
Takata, J.; Wang, H. -H.; Dai, S. +4 more
The high magnetic field pulsar PSR J1119-6127, detected from radio to high-energy wavelengths, underwent a magnetar-like outburst beginning on 2016 July 27. In this paper, we study the postoutburst multiwavelength properties of this pulsar from the radio to GeV bands and discuss its similarity with the outburst of the magnetar XTE J1810-197. In ph…
Evidence for non-smooth quenching in massive galaxies at z ∼ 1
Whitaker, Katherine; Guo, Yicheng; Nayyeri, Hooshang +3 more
We investigate a large sample of massive galaxies at z ∼ 1 with combined Hubble Space Telescope (HST) broad-band and grism observations to constrain the star formation histories (SFHs) of these systems as they transition from a star-forming state to quiescence. Among our sample of massive (M_*> 10^{10} M_{⊙}) galaxies at 0.7 < z < 1.2, du…
TESS photometry of helium-rich hot subdwarfs: r modes in BD+37°442 and BD+37°1977
Jeffery, C. Simon
Transiting Exoplanet Survey Satellite photometry of the extremely helium-rich hot subdwarfs BD+37°442 and BD+37°1977 demonstrates multiperiodic low-amplitude variability with principal periods of 0.56 and 1.14 d, respectively, and with both first and second harmonics present. The light curves are not perfectly regular, implying additional periodic…
Improving Predictions of High-Latitude Coronal Mass Ejections Throughout the Heliosphere
Rodriguez, L.; Poedts, S.; Scolini, C. +2 more
Predictions of the impact of coronal mass ejections (CMEs) in the heliosphere mostly rely on cone CME models, whose performances are optimized for locations in the ecliptic plane and at 1 AU (e.g., at Earth). Progresses in the exploration of the inner heliosphere, however, advocate the need to assess their performances at both higher latitudes and…
Compositional Measurements of Saturn's Upper Atmosphere and Rings from Cassini INMS
Yelle, R. V.; Hörst, S. M.; Koskinen, T. T. +4 more
The Cassini spacecraft's last orbits directly sampled Saturn's thermosphere and revealed a much more chemically complex environment than previously believed. Observations from the Ion and Neutral Mass Spectrometer (INMS) aboard Cassini provided compositional measurements of this region and found an influx of material raining into Saturn's upper at…
The Extended Gaia-PS1-SDSS (GPS1+) Proper Motion Catalog
Goldman, Bertrand; Tian, Hai-Jun; Rix, Hans-Walter +3 more
The Gaia + PanSTARRS1 (PS1) + Sloan Digital Sky Survey (SDSS) + Two Micron All-Sky Survey (2MASS) (GPS1) catalog was released in 2017. It delivered precise proper motions for around 350 million sources down to a magnitude of $r\sim 20$ mag. In this study, we present GPS1+, the extension GPS1 catalog down to $r\sim 22.5$ mag, based on Gaia data rel…
Analysis of absorption lines in the high-resolution spectra of five hot post-AGB candidates
Herrero, A.; Simón-Díaz, S.; Hubrig, S. +3 more
From an analysis of absorption lines in the high-resolution spectra, we have derived the radial velocities, stellar parameters (Teff, log g, wind-strength parameter log Q, and projected rotational velocity), and abundances (C, N, O, and Si) of IRAS 17460-3114, IRAS 18131-3008, IRAS 19336-0400, LSE 45, and LSE 163. Abundances are found t…