Search Publications
Motions in Prominence Barbs Observed on the Solar Limb
Tarbell, T. D.; Kucera, T. A.; Ofman, L.
We analyze and discuss an example of prominence barbs observed on the limb on 2016 January 7 by the Hinode/Solar Optical Telescope in Ca II and Hα, the Interface Region Imaging Spectrograph, with slit jaw images and Mg II spectral data, and the Solar Dynamics Observatory’s Atmospheric Imaging Assembly. In the recent literature there has been a deb…
A Deep X-Ray View of the Synchrotron-dominated Supernova Remnant G330.2+1.0
Temim, Tea; Petre, Robert; Williams, Brian J. +1 more
We present moderately deep (125 ks) XMM-Newton observations of supernova remnant G330.2+1.0. This remnant is one of only a few known that fall into the “synchrotron-dominated” category, with the emission almost entirely dominated by a nonthermal continuum. Previous X-ray observations could only characterize the spectra of a few regions. Here, we e…
Banyan. X. Discovery of a Wide, Low-gravity L-type Companion to a Fast-rotating M3 Dwarf
Faherty, Jacqueline K.; Gagné, Jonathan; Doyon, René +4 more
We report the discovery of a substellar-mass co-moving companion to 2MASS J22501512+2325342, an M3 candidate member of the young (130-200 Myr) AB Doradus Moving Group (ABDMG). This L3 β companion was discovered in a 2MASS search for companions at separations of 3″-18″ from a list of 2812 stars suspected to be young (≲500 Myr) in the literature, an…
Aliasing in the Radial Velocities of YZ Ceti: An Ultra-short Period for YZ Ceti c?
Robertson, Paul
Mid-to-late M stars are opportunistic targets for the study of low-mass exoplanets in transit because of the high planet-to-star radius ratios of their planets. Recent studies of such stars have shown that, like their early-M counterparts, they often host multi-resonant networks of small planets. Here, I reanalyze radial velocity measurements of Y…
Chandra X-Ray Observatory and Hubble Space Telescope Observations of the Intermediate-age Cluster GLIMPSE-C01
Kargaltsev, Oleg; Hare, Jeremy; Rangelov, Blagoy
We report the results of Hubble Space Telescope and Chandra X-Ray Observatory observations of the GLIMPSE-C01 (hereafter GC01) star cluster. Color-magnitude and color-color diagrams suggest a cluster age of ≳2 Gyr up to ∼10 Gyr (dependent on GC01's metallicity), a distance of 3.3-3.5 kpc, and strong differential reddening with A V = 1…
Excess in the High-frequency Radio Background: Insights from Planck
Chary, Ranga-Ram; Murphy, Eric J.
We conduct a stacking analysis using the combination of 1.4 GHz detections in the NRAO VLA Sky Survey (NVSS) and Planck all-sky maps to estimate the differential source counts down to the few 100 µJy level at 30, 44, 70, and 100 GHz. Using these source count estimates, we are able to measure the integrated extragalactic background light from…
Spectroscopic Measurements of the Ion Velocity Distribution at the Base of the Fast Solar Wind
Fletcher, Lyndsay; Jeffrey, Natasha L. S.; Savin, Daniel W. +1 more
In situ measurements of the fast solar wind reveal non-thermal distributions of electrons, protons, and minor ions extending from 0.3 au to the heliopause. The physical mechanisms responsible for these non-thermal properties and the location where these properties originate remain open questions. Here, we present spectroscopic evidence, from extre…
Magnetic Structure of a Composite Solar Microwave Burst
Masuda, Satoshi; Liu, Chang; White, Stephen M. +2 more
A composite flare consisting of an impulsive flare SOL2015-06-21T01:42 (GOES class M2.0) and a more gradual, long-duration flare SOL2015-06-21T02:36 (M2.6) from NOAA Active Region 12371, is studied using observations with the Nobeyama Radioheliograph (NoRH) and the Solar Dynamics Observatory (SDO). While composite flares are defined by their chara…
X-Ray Observations of Magnetar SGR 0501+4516 from Outburst to Quiescence
Ng, C. -Y.; Mong, Y. -L.
Magnetars are neutron stars having extreme magnetic field strengths. Study of their emission properties in quiescent state can help understand effects of a strong magnetic field on neutron stars. SGR 0501+4516 is a magnetar that was discovered in 2008 during an outburst, which has recently returned to quiescence. We report its spectral and timing …
Theoretically Motivated Search and Detection of Non-thermal Pulsations from PSRs J1747-2958, J2021+3651, and J1826-1256
Rea, Nanda; Coti Zelati, Francesco; Torres, Diego F. +3 more
Based on a theoretical selection of pulsars as candidates for detection at X-ray energies, we present an analysis of archival X-ray observations performed with Chandra and XMM-Newton of PSR J1747-2958 (the pulsar in the “Mouse” nebula), PSR J2021+3651 (the pulsar in the “Dragonfly” nebula), and PSR J1826-1256. X-ray pulsations from PSR J1747-2958 …