Search Publications
Missions
Journals
Publication Years
Electrostatic Solitary Waves in the Earth's Bow Shock: Nature, Properties, Lifetimes, and Origin
Russell, C. T.; Bale, S. D.; Khotyaintsev, Y. +10 more
We present a statistical analysis of >2,100 bipolar electrostatic solitary waves (ESWs) collected from 10 quasi-perpendicular Earth's bow shock crossings by Magnetospheric Multiscale spacecraft. We developed and implemented a correction procedure for reconstruction of actual electric fields, velocities, and other properties of ESW, whose spatia…
A survey of CH2DOH towards starless and pre-stellar cores in the Taurus molecular cloud
Shirley, Yancy L.; Scibelli, Samantha; Ambrose, Hannah E.
Recent observations indicate that organic molecules are prevalent towards starless and pre-stellar cores. Deuteration of these molecules has not been well studied during the starless phase. Published observations of singly deuterated methanol, CH2DOH, have only been observed in a couple of well-studied, dense, and evolved pre-stellar co…
The Old Moving Groups in the Field of Taurus
Fang, Min; Tian, Hao; Yang, Chengqun +3 more
In this work, we present a systematic search for stellar groups in the Taurus field by applying the DBSCAN algorithm to the data from Gaia DR2. We find 22 groups, consisting of 8 young groups (Groups 1-8) at ages of 2-4 Myr and distances of ∼130-170 pc, and 14 old groups (Groups 9-22) at ages of 8-49 Myr and distances of ∼110-210 pc. We characteri…
Thermal Emission and Radioactive Lines, but No Pulsar, in the Broadband X-Ray Spectrum of Supernova 1987A
Fransson, Claes; Alp, Dennis; Larsson, Josefin
Supernova 1987A offers a unique opportunity to study an evolving supernova in unprecedented detail over several decades. The X-ray emission is dominated by interactions between the ejecta and the circumstellar medium, primarily the equatorial ring (ER). We analyze 3.3 Ms of NuSTAR data obtained between 2012 and 2020, and two decades of XMM-Newton …
Compact Starburst Galaxies with Fast Outflows: Central Escape Velocities and Stellar Mass Surface Densities from Multiband Hubble Space Telescope Imaging
Moustakas, John; Coil, Alison L.; Rudnick, Gregory H. +21 more
We present multiband Hubble Space Telescope imaging that spans rest-frame near-ultraviolet through near-infrared wavelengths ( ${\lambda }_{\mathrm{rest}}=0.3$ -1.1 µm) for 12 compact starburst galaxies at z = 0.4-0.8. These massive galaxies ( ${{ \mathcal M }}_{* }\sim {10}^{11}\,{{ \mathcal M }}_{\odot }$ ) are driving very fast outflows (…
UOCS - VI. UVIT/AstroSat detection of low-mass white dwarf companions to four more blue stragglers in M67
Jadhav, Vikrant V.; Subramaniam, Annapurni; Pandey, Sindhu
Blue straggler stars (BSSs) in M67 have attracted attention from observations and theory to unravel their formation mechanisms. In the series of Ultra Violet Imaging Telescope (UVIT on AstroSat) study of Open clusters (UOCS), here we report the detection of hot companions to 4 more BSSs (WOCS 2013, WOCS 3013, WOCS 4006, and WOCS 5005), using Far-U…
A HARPS-N mass for the elusive Kepler-37d: a case study in disentangling stellar activity and planetary signals
Aigrain, S.; Poretti, E.; Sozzetti, A. +22 more
To date, only 18 exoplanets with radial velocity (RV) semi-amplitude <2 m s-1 have had their masses directly constrained. The biggest obstacle to RV detection of such exoplanets is variability intrinsic to stars themselves, e.g. nuisance signals arising from surface magnetic activity such as rotating spots and plages, which can drown…
Pursuing the Origin of the Gamma Rays in RX J1713.7-3946 Quantifying the Hadronic and Leptonic Components
Inoue, Tsuyoshi; Tachihara, Kengo; Fukui, Yasuo +5 more
We analyzed the TeV gamma-ray image of a supernova remnant RX J1713.7-3946 (RX J1713) through a comparison with the interstellar medium (ISM) and nonthermal X-rays. The gamma-ray data sets at two energy bands of >2 TeV and >250-300 GeV were obtained with H.E.S.S. and utilized in the analysis. We employed a new methodology, which assumes that…
Deciphering the Kinematic Structure of the Small Magellanic Cloud through Its Red Giant Population
van der Marel, Roeland P.; Kallivayalil, Nitya; Zivick, Paul
We present a new kinematic model for the Small Magellanic Cloud (SMC), using data from the Gaia Data Release 2 catalog. We identify a sample of astrometrically well-behaved red giant (RG) stars belonging to the SMC and cross-match with publicly available radial velocity (RV) catalogs. We create a 3D spatial model for the RGs, using RR Lyrae for di…
Propagating Conditions and the Time of ICME Arrival: A Comparison of the Effective Acceleration Model with ENLIL and DBEM Models
Vourlidas, Angelos; Dumbović, Mateja; Papaioannou, Athanasios +5 more
The Effective Acceleration Model (EAM) predicts the Time-of-Arrival (ToA) of the Coronal Mass Ejection (CME) driven shock and the average speed within the sheath at 1 AU. The model is based on the assumption that the ambient solar wind interacts with the interplanetary CME (ICME) resulting in constant acceleration or deceleration. The upgraded ver…