Search Publications
Extreme Rarefaction of Solar Wind: A Study on Origin and Characteristics Using Ulysses Observations
Hajra, Rajkumar; Tsurutani, Bruce T.; Lu, Quanming +5 more
From the Ulysses observation of the solar wind between the heliocentric distance r h of ~1.0 and ~5.4 au during 1990-2009, we identified 53 intervals when the solar wind exhibited extreme rarefaction, ~2 orders of magnitude decreases in the solar wind proton density N p from their ambient values. These extremely low-densi…
X-ray from outflow-cloud interaction and its application in tidal disruption events
Wang, Wei; Chen, Jiashi
Tidal disruption events (TDEs) may occur in supermassive black holes (SMBHs) surrounded by clouds. TDEs can generate ultrafast and large opening-angle outflow with a velocity of ~0.01-0.2 c, which will collide with clouds with time lags depending on outflow velocity and cloud distances. Since the fraction of the outflow energy transferred into clo…
On Current Sheets and Associated Density Spikes in Titan's Ionosphere as Seen From Cassini
Edberg, Niklas J. T.; Vigren, Erik; Bertucci, Cesar +3 more
The Cassini spacecraft made in-situ measurements of Titan's plasma environment during 126 close encounters between 2004 and 2017. Here we report on observations from the Radio and Plasma Waves System/Langmuir probe instrument (RPWS/LP) from which we have observed, primarily on the outbound leg, a localized increase of the electron density by up to…
Chandrayaan-3 Alternate Landing Site: Pre-Landing Characterisation
Bhatt, Megha; Bhardwaj, Anil; Srivastava, Neeraj +5 more
India's third Moon mission Chandrayaan 3 will deploy a lander and a rover at a high latitude location of the Moon enabling us to carry out first ever in-situ science investigations of such a pristine location that will potentially improve our understanding on primary crust formation and subsequent modification processes. The primary landing site (…
Energy-releasing Process for the 2013 May 13 X1.7 Limb Flare: A Continued Study
Li, Dong; Ji, Haisheng; Huang, Yu +3 more
In this paper, we reanalyze the X1.7 class limb flare that occurred on 2013 May 13 (SOL2013-05-13T01:56 UT), concentrating on the energy-releasing process using microwave observations mainly made by Nobeyama and X-ray observations made by RHESSI. The analysis was carried out in the context of EUV observations made by the Atmospheric Imaging Assemb…
The Effect of Environment on the Properties of the Most Massive Galaxies at 0.5 < z < 2.5 in the COSMOS-DASH Field
Lin, Zesen; Kong, Xu; Gu, Yizhou +2 more
How the environment influences the most massive galaxies is still unclear. To explore the effects of the environment on morphology and star formation in the most massive galaxies at high redshift, we select galaxies with stellar mass $\mathrm{log}({M}_{\star }/{M}_{\odot })\gt 11$ at 0.5 < z < 2.5 in the COSMOS-DASH field, which is the large…
A Search for Gas-Rich Dwarf Galaxies in the Local Universe with ALFALFA and the WIYN One Degree Imager
Cannon, John M.; Salzer, John J.; Haynes, Martha P. +5 more
We present results from an optical search for Local Group dwarf galaxy candidates associated with the Ultra-Compact High Velocity Clouds (UCHVCs) discovered by the ALFALFA neutral hydrogen survey. The ALFALFA UCHVCs are isolated, compact H I clouds with projected sizes, velocities, and estimated H I masses that suggest they may be nearby dwarf gal…
Solar-Type Eclipsing Binary KIC 4832197: Physical Properties and Intrinsic Variability of the Components
Özdarcan, O.; Dal, H. A.; Yoldaş, E.
Comprehensive analysis of optical spectroscopy and space photometry of the solar type eclipsing binary system KIC 4832197 is presented. The system is composed of F7V + F9V components with masses of M1 = 1.16 ± 0.12 M⊙, M2 = 1.07 ± 0.10 M⊙ and radii of R1 = 1.26 ± 0.04 R⊙, R2
Crossmatching of high-proper motion L, T, and Y brown dwarfs with large photometric surveys
Avdeeva, Aleksandra S.; Karpov, Sergey V.; Malkov, Oleg Yu.
L, T, and Y brown dwarf (BD) exploration is a topical issue. First, the transition boundary between planets and BDs is not fully understood yet. Second, there is a phenomenon called the L/T-transition. The observed properties of cooler BDs differ significantly from the less cool ones, namely, colors of BDs shift much bluer and, simultaneously, dwa…
Semi-analytic calculations for extended mid-infrared emission associated with FU Ori-type objects
Liu, Sheng-Yuan; Takami, Michihiro; Wang, Shiang-Yu +4 more
Aims: Near-infrared imaging polarimetry at high-angular resolutions has revealed an intriguing distribution of circumstellar dust toward FU Ori-type objects (FUors). These dust grains are probably associated with either an accretion disk or an infalling envelope. Follow-up observations in the mid-infrared would lead us to a better understandi…