Search Publications
HST/STIS Capability for Love Number Measurement of WASP-121b
Rauer, Heike; Csizmadia, Szilárd; Padovan, Sebastiano +2 more
Data from transit light curves, radial velocity, and transit timing observations can be used to probe the interiors of exoplanets beyond the mean density, by measuring the Love numbers h2 and k2. The first indirect estimate of k2 for an exoplanet from radial velocity and transit timing variation observations has be…
Physical Conditions in Shocked Interstellar Gas Interacting with the Supernova Remnant IC 443
Jenkins, Edward B.; Ritchey, Adam M.; Federman, S. R. +3 more
We present the results of a detailed investigation into the physical conditions in interstellar material interacting with the supernova remnant (SNR) IC 443. Our analysis is based on a comprehensive examination of high-resolution far-ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope of tw…
The Nonstandard Properties of a "Standard" PWN: Unveiling the Mysteries of PWN G21.5-0.9 Using Its IR and X-Ray Emission
Gelfand, Joseph D.; Temim, Tea; Slane, Patrick O. +3 more
The evolution of a pulsar wind nebula (PWN) depends on properties of the progenitor star, supernova, and surrounding environment. As some of these quantities are difficult to measure, reproducing the observed dynamical properties and spectral energy distribution (SED) with an evolutionary model is often the best approach to estimating their values…
PIC Simulations of Microinstabilities and Waves at Near-Sun Solar Wind Perpendicular Shocks: Predictions for Parker Solar Probe and Solar Orbiter
Yang, Zhongwei; Liu, Ying D.; Guo, Fan +6 more
Microinstabilities and waves excited at moderate-Mach-number perpendicular shocks in the near-Sun solar wind are investigated by full particle-in-cell simulations. By analyzing the dispersion relation of fluctuating field components directly issued from the shock simulation, we obtain key findings concerning wave excitations at the shock front: (1…
The Broad-lined Ic Supernova ZTF18aaqjovh (SN 2018bvw): An Optically Discovered Engine-driven Supernova Candidate with Luminous Radio Emission
Kulkarni, S. R.; Cenko, S. Bradley; Riddle, Reed +25 more
We present ZTF18aaqjovh (SN 2018bvw), a high-velocity ("broad-lined") stripped-envelope (Type Ic) supernova (Ic-BL SN) discovered in the Zwicky Transient Facility one-day cadence survey. ZTF18aaqjovh shares a number of features in common with engine-driven explosions: the photospheric velocity and the shape of the optical light curve are very simi…
Investigating the Chromospheric Footpoints of the Solar Wind
De Pontieu, Bart; McIntosh, Scott W.; Brooks, David H. +1 more
Coronal holes present the source of the fast solar wind. However, the fast solar wind is not unimodal—there are discrete, but subtle, compositional, velocity, and density structures that differentiate different coronal holes as well as wind streams that originate within one coronal hole. In this Letter we exploit full-disk observational "mosaics" …
The Hα Emission Line Variations of HR 6819
Gies, Douglas R.; Wang, Luqian
The star system HR 6819 was recently proposed by Rivinius et al. as the site of the nearest example of a stellar-mass black hole. Their spectra show evidence of two components: a B3 III star in a 40 day orbit and a stationary B-emission line star. Based upon the orbital mass function and the lack of evidence of a spectral component with reflex orb…
Tracing the Coevolution Path of Supermassive Black Holes and Spheroids with AKARI-selected Ultraluminous IR Galaxies at Intermediate Redshifts
Yamamura, Issei; Toba, Yoshiki; Noda, Hirofumi +6 more
We present the stellar population and ionized-gas outflow properties of ultraluminous IR galaxies (ULIRGs) at z = 0.1-1.0 that are selected from the AKARI far-IR all-sky survey. We construct a catalog of 1077 ULIRGs to examine feedback effects after major mergers. Of the 1077 ULIRGs, 202 are spectroscopically identified by SDSS and Subaru/FOCAS ob…
Spectroscopic Detection of the Pre-White Dwarf Companion of Regulus
Gies, Douglas R.; Lester, Kathryn V.; Wang, Luqian +6 more
Mass transfer in an interacting binary will often strip the mass donor of its entire envelope and spin up the mass gainer to near critical rotation. The nearby B-type star Regulus represents a binary in the post-mass transfer stage: it is a rapid rotator with a very faint companion in a 40 days orbit. Here we present the results of a search for th…
Hydroxylated Mg-rich Amorphous Silicates: A New Component of the 3.2 µm Absorption Band of Comet 67P/Churyumov-Gerasimenko
Carlson, R. W.; Kappel, D.; Pommerol, A. +13 more
The VIRTIS imaging spectrometer on board Rosetta has shown that the nucleus surface of comet 67P/Churyumov-Gerasimenko (67P/CG) is characterized by a broad absorption band at around 3.2 µm. The feature is ubiquitous across the surface and its attribution to (a) specific material(s) has been challenging. In the present Letter, we report an ex…