1 to 10 of 11 Results
Dec 8, 2020
Joseph Lazio, 2020, "Bistatic Radar Observations of Near-Earth Asteroid (163899) 2003 SD220 from the Southern Hemisphere", https://doi.org/10.48577/jpl.JIZAQN, Icarus, JPL Open Repository
We report results of Canberra-ATCA Doppler-only continuous wave (CW) radar observations of near-Earth asteroid (163899) 2003 SD220 at a receiving frequency of 7159 MHz (4.19 cm) on 2018 December 20, 21, and 22 during its close approach within 0.019 au (7.4 lunar distances). Echo... |
Nov 16, 2020
Joseph Lazio, 2020, "In search of radio emission from exoplanets: GMRT observations of the binary system HD 41004", https://doi.org/10.48577/jpl.ZK5UH7, Monthly Notices of the Royal Astronomical Society, JPL Open Repository
This paper reports Giant Metrewave Radio Telescope (GMRT) observations of the binary HD 41004 that are among the deepest images ever obtained at 150 MHz and 400 MHz in the search for radio emission from exoplanets. The HD 41004 system consists of a K1 primary and an M2 secondary;... |
Nov 11, 2020
Joseph Lazio, 2020, "Radio Observations of HD 80606 Near Planetary Periastron II. LOFAR Low Band Antenna Observations", https://doi.org/10.48577/jpl.XN6O1C, Astronomy & Astrophysics, JPL Open Repository
All of the giant planets in the solar system generate radio emission via the electron cyclotron maser instability, most notably giving rise to Jupiter's decametric emissions. HD 80606b is a giant planet and it is highly eccentric, leading to predictions that its radio emission ma... |
Nov 9, 2020
Joseph Lazio, 2020, "The search for radio emission from the exoplanetary systems 55 Cancri, Andromedae, and Boötis using LOFAR beam-formed observations", https://doi.org/10.48577/jpl.1QWABX, Astronomy & Astrophysics, JPL Open Repository
Context. The detection of radio emissions from exoplanets will open up a vibrant new research field. Observing planetary auroral radio emission is the most promising method to detect exoplanetary magnetic fields, the knowledge of which will provide valuable insights to the planet... |
Nov 3, 2020
Joseph Lazio, 2020, "The NANOGrav 12.5-year Data Set: Observations and Narrowband Timing of 47 Millisecond Pulsars", https://doi.org/10.48577/jpl.EJEEPY, The Astrophysical Journal Supplement, JPL Open Repository
We present time-of-arrival measurements and timing models of 47 millisecond pulsars (MSPs) ob- served from 2004 to 2017 at the Arecibo Observatory and the Green Bank Telescope by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav). The observing cadence wa... |
Nov 3, 2020
Joseph Lazio, 2020, "The NANOGrav 12.5-year Data Set: Wideband Timing of 47 Millisecond Pulsars", https://doi.org/10.48577/jpl.B9YDFW, Astrophysical Journal, JPL Open Repository
We present a new analysis of the profile data from the 47 millisecond pulsars comprising the 12.5-year data set of the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), which is presented in a parallel paper (Alam et al. submitted to ApJS; NG12.5). Our repr... |
Oct 30, 2020
Joseph Lazio, 2020, "Chandra Observations of Abell 2261 Brightest Cluster Galaxy, a Candidate Host to a Recoiling Black Hole", https://doi.org/10.48577/jpl.P5PFQS, The Astrophyscial Journal, JPL Open Repository
We use Chandra X-ray observations to look for evidence of a recoiling black hole from the brightest cluster galaxy in Abell 2261 (A2261-BCG). A2261-BCG is a strong candidate for a recoiling black hole because of its large, flat stellar core, revealed by Hubble Space Telescope ima... |
Oct 7, 2020
Joseph Lazio, 2020, "A Distant Fast Radio Burst Associated to its Host Galaxy with the Very Large Array", https://doi.org/10.48577/jpl.3L51O7, American Astronomical Society journals, JPL Open Repository
We present the discovery and subarcsecond localization of a new Fast Radio Burst with the Karl G. Jansky Very Large Array and realfast search system. The FRB was discovered on 2019 June 14 with a dispersion measure of 959 pc/cm3. This is the highest DM of any localized FRB and it... |
May 4, 2020
Joseph Lazio, 2020, "Very long baseline astrometry of PSR J1012+5307 and its implications on alternative theories of gravity", https://doi.org/10.48577/jpl.OXFGEG, The Astrophysical Journal, JPL Open Repository
PSR J1012+5307 is a millisecond pulsar with a helium white dwarf (WD) companion ∼ 9.6% as massive as the pulsar. PSR J1012+5307 has been timed with high precision for about 25 years. One of the main objectives of this long-term timing is to use the large asymmetry in gravitationa... |
Mar 2, 2020
Joseph Lazio, 2020, "On Frequency-Dependent Dispersion Measures and “Extreme Scattering Events”", https://doi.org/10.48577/jpl.DKRNWR, Astrophysical Journal, JPL Open Repository
Radio emission propagating over an Earth-pulsar line of sight provides a unique probe of the intervening ionized interstellar medium (ISM). Variations in the integrated electron column density along this line of sight, or dispersion measure (DM), have been observed since shortly... |
