GBT20A-558

Continuing to Determine the Orbits of Pulsars Found in Fermi Sources

Abstract

Searches for pulsars in the error boxes of gamma-ray sources identified by the Large Area Telescope (LAT) on NASA's Fermi Gamma-ray Space Telescope have been immensely successful in the past decade. Since many discoveries have been made of very short orbital period (binary period less than 12 hours) systems, so-called "spider" systems, we have initiated a specific effort to look for compact binaries using Jerk searches instead of conventional acceleration searches. Using recent data from observations of Fermi sources done at 820 MHz using the Green Bank Telescope (GBT), this effort has resulted in the discovery of four new millisecond pulsars (MSPs), one of which showed a very significant jerk component and has been now determined to be a black widow in a 2.2 hour orbit and one has now been shown to be isolated. This proposal is to continue to use filler time to try and further constrain the orbital parameters of the remaining two new MSPs which would simplify and extend the baseline of future timing efforts. This proposal is in response to the Special Call for DDT proposals during the IDOS.

Investigators

Name	Institution
Mallory Roberts	Eureka Scientific, Inc.
Scott Ransom	National Radio Astronomy Observatory; Virginia, University of
Thankful Cromartie	Cornell University; Virginia, University of; Naval Research Laboratory
Shawaiz Tabassum *	West Virginia University; Abu Dhabi, New York University

* indicates the PI