Search Publications
A Tail Structure Associated with a Protoplanetary Disk around SU Aurigae
Dong, Ruobing; Liu, Sheng-Yuan; Tamura, Motohide +4 more
We present Atacama Large Millimeter/submillimeter Array observations of the CO (J = 2 - 1) line emission from a protoplanetary disk around T-Tauri star SU Aurigae (hereafter SU Aur). Previous observations in optical and near-infrared wavelengths find a unique structure in SU Aur. One of the highlights of the observational results is that an extend…
Olivine-dominated A-type asteroids in the main belt: Distribution, abundance and relation to families
Hsieh, Henry H.; Moskovitz, Nicholas A.; Polishook, David +5 more
Differentiated asteroids are rare in the main asteroid belt despite evidence for ∼ 100 distinct differentiated bodies in the meteorite record. We have sought to understand why so few main-belt asteroids differentiated and where those differentiated bodies or fragments reside. Using the Sloan Digital Sky Survey (SDSS) to search for a needle in a ha…
Relation between winds and jets in radio-loud AGN
Mehdipour, Missagh; Costantini, Elisa
We have investigated the relation between the two modes of outflow (wind and jet) in radio-loud active galactic nuclei (AGN). For this study we have carried out a systematic and homogeneous analysis of XMM-Newton spectra of a sample of 16 suitable radio-loud Seyfert-1 AGN. The ionised winds in these AGN are parameterised through high-resolution X-…
Discovery of a New Stellar Subpopulation Residing in the (Inner) Stellar Halo of the Milky Way
Beers, Timothy C.; Placco, Vinicius M.; Robin, Annie C. +8 more
We report the discovery of a unique collection of metal-poor giant stars that exhibit anomalously high levels of 28Si, clearly above typical Galactic levels. Our sample spans a narrow range of metallicities, peaking at -1.07 ± 0.06, and exhibits abundance ratios of [Si, Al/Fe] that are as extreme as those observed in Galactic globular c…
Gaia stellar kinematics in the head of the Orion A cloud: runaway stellar groups and gravitational infall
Garmire, G. P.; Getman, K. V.; Kuhn, M. A. +1 more
This work extends previous kinematic studies of young stars in the head of the Orion A cloud (OMC-1/2/3/4/5). It is based on large samples of infrared, optical, and X-ray selected pre-main-sequence stars with reliable radial velocities and Gaia-derived parallaxes and proper motions. Stellar kinematic groups are identified assuming they mimic the m…
Multipoint Observations of the June 2012 Interacting Interplanetary Flux Ropes
Poedts, Stefaan; Futaana, Yoshifumi; Palmerio, Erika +10 more
In this paper we perform a detailed analysis of interplanetary flux ropes observed between June 15-17, 2012 at Venus and subsequently at Earth's Lagrange L1 point, while the observation points were separated by about 0.28 AU in radial distance and 5° in heliographic longitude. The flux ropes were associated with coronal mass ejections (CMEs) that …
Gaia-DR2 extended kinematical maps . I. Method and application
López-Corredoira, M.; Sylos Labini, F.
Context. The Gaia Collaboration has used Gaia-DR2 sources with six-dimensional (6D) phase space information to derive kinematical maps within 5 kpc of the Sun, which is a reachable range for stars with relative error in distance lower than 20%.
Aims: Here we aim to extend the range of distances by a factor of two to three, thus adding the ran…
Short-duration Stellar Flares in GALEX Data
Brasseur, C. E.; Osten, Rachel A.; Fleming, Scott W.
We report on a population of short-duration near-ultraviolet (NUV) flares in stars observed by the Kepler and Galaxy Evolution Explorer (GALEX) missions. We analyzed the NUV light curves of 34,276 stars observed from 2009 to 2013 by both the GALEX (NUV) and Kepler (optical) space missions with the eventual goal of investigating multiwavelength fla…
Origin of the Extended Mars Radar Blackout of September 2017
Leblanc, François; Witasse, Olivier; Sánchez-Cano, Beatriz +13 more
The Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) onboard Mars Express, which operates between 0.1 and 5.5 MHz, suffered from a complete blackout for 10 days in September 2017 when observing on the nightside (a rare occurrence). Moreover, the Shallow Radar (SHARAD) onboard the Mars Reconnaissance Orbiter, which operates at 20…
Geometry, Kinematics, and Heliospheric Impact of a Large CME-driven Shock in 2017 September
Liu, Ying D.; Zhao, Xiaowei; Zhu, Bei
A powerful coronal mass ejection (CME) occurred on 2017 September 10 near the end of the declining phase of the historically weak solar cycle 24. We obtain new insights concerning the geometry and kinematics of CME-driven shocks in relation to their heliospheric impacts from the optimal, multispacecraft observations of the eruption. The shock, whi…