P. C. C. Freire

Publication List Details

Period

2004 - 2009

Number

53

Co-Authors

Searches for gravitational waves from known pulsars with S5 LIGO data (2009)

Collaboration, The LIGO Scientific, Abbott, R., Acernese, F., Adhikari, R., Ajith, P., ...

We present a search for gravitational waves from 116 known millisecond and young pulsars using data from the fifth science run of the LIGO detectors. For this search ephemerides overlapping the run...

Radio detection of LAT PSRs J1741-2054 and J2032+4127: no longer just gamma-ray pulsars (2009)

Camilo, F., Ray, P. S., Ransom, S. M., Burgay, M., Johnson, T. J., Kerr, M., ...

Sixteen pulsars have been discovered so far in blind searches of photons collected with the Large Area Telescope on the Fermi Gamma-ray Space Telescope. We here report the discovery of radio...

A new technique for timing the double pulsar system (2009)

Freire, P. C. C., Wex, N., Kramer, M., Lorimer, D. R., McLaughlin, M. A., Stairs, I. H., ...

In 2004, McLaughlin et al. discovered a phenomenon in the radio emission of PSR J0737-3039B (B) that resembles drifting sub-pulses. The repeat rate of the sub-pulses is equal to the spin frequency of...

Radio detection of LAT PSRs J1741-2054 and J2032+4127: no longer just gamma-ray pulsars (2009)

Camilo, F., Ray, P. S., Ransom, S. M., Burgay, M., Johnson, T. J., Kerr, M., ...

Sixteen pulsars have been discovered so far in blind searches of photons collected with the Large Area Telescope on the Fermi Gamma-ray Space Telescope. We here report the discovery of radio...

Arecibo pulsar survey using ALFA: probing radio pulsar intermittency and transients (2009)

Deneva, J. S., Cordes, J. M., McLaughlin, M. A., Nice, D. J., Lorimer, D. R., Crawford, F., ...

We present radio transient search algorithms, results, and statistics from the ongoing Arecibo Pulsar ALFA (PALFA) survey of the Galactic plane. We have discovered seven objects through a search for...

Arecibo pulsar survey using ALFA: probing radio pulsar intermittency and transients (2009)

Deneva, J. S., Cordes, J. M., McLaughlin, M. A., Nice, D. J., Lorimer, D. R., Crawford, F., ...

We present radio transient search algorithms, results, and statistics from the ongoing Arecibo Pulsar ALFA (PALFA) survey of the Galactic plane. We have discovered seven objects through a search for...

Arecibo Pulsar Survey Using ALFA. III. Probing Radio Pulsar Intermittency and Transients (2008)

Deneva, J. S., Cordes, J. M., McLaughlin, M. A., Nice, D. J., Lorimer, D. R., Crawford, F., ...

We present radio transient search algorithms, results, and statistics from the ongoing Arecibo Pulsar ALFA (PALFA) Survey of the Galactic plane. We have discovered seven objects by detecting isolated...

Pulsar Timing for the Fermi Gamma-ray Space Telescope (2008)

Smith, D. A., Guillemot, L., Camilo, F., Cognard, I., Dumora, D., Espinoza, C., ...

We describe a comprehensive pulsar monitoring campaign for the Large Area Telescope (LAT) on the {\em Fermi Gamma-ray Space Telescope} (formerly GLAST). The detection and study of pulsars in gamma...

PSR J1856+0245: Arecibo Discovery of a Young, Energetic Pulsar Coincident with the TeV Gamma-ray Source HESS J1857+026 (2008)

Hessels, J. W. T., Nice, D. J., Gaensler, B. M., Kaspi, V. M., Lorimer, D. R., Champion, D. J., ...

We present the discovery of the Vela-like radio pulsar J1856+0245 in the Arecibo PALFA survey. PSR J1856+0245 has a spin period of 81ms, a characteristic age of 21kyr, and a spin-down luminosity Edot...

An Eccentric Binary Millisecond Pulsar in the Galactic Plane (2008)

Champion, D. J., Ransom, S. M., Lazarus, P., Camilo, F., Bassa, C., Kaspi, V. M., ...

Binary pulsar systems are superb probes of stellar and binary evolution and the physics of extreme environments. In a survey with the Arecibo telescope, we have found PSR J1903+0327, a radio pulsar...

An eccentric binary millisecond pulsar in the Galactic plane (2008)

Champion, D.J., Ransom, S.M., Lazarus, P., Camilo, F., Bassa, C., Kaspi, V.M., ...

Binary pulsar systems are superb probes of stellar and binary evolution and the physics of extreme environments. In a survey with the Arecibo telescope, we have found PSR J1903+ 0327, a radio pulsar...

The discovery of an eccentric millisecond pulsar in the Galactic plane (2008)

Champion, D.J., Ransom, S.M., Lazarus, P., Camilo, F., Kaspi, V.M., Nice, D.J., ...

The evolution of binary systems is governed by their orbital properties and the stellar density of the local environment. Studies of neutron stars in binary star systems offer unique insights into...

PSR J1856+0245: Arecibo discovery of a young, energetic pulsar coincident with the TeV γ-ray source HESS J1857+026 (2008)

Hessels, J.W.T., Nice, D.J., Gaensler, B.M., Kaspi, V.M., Lorimer, D.R., Champion, D.J., ...

We present the discovery of the Vela-like radio pulsar J1856+0245 in the Arecibo PALFA survey. PSR J1856+0245 has a spin period of 81 ms, a characteristic age of 21 kyr, and a spin-down luminosity...

Eight new millisecond pulsars in NGC 6440 and NGC 6441 (2008)

Freire, P.C.C., Ransom, S.M., Bégin, S., Stairs, I.H., Hessels, J.W.T., Frey, L.H., ...

Motivated by the recent discovery of 30 new millisecond pulsars in Terzan 5, made using the Green Bank Telescope's S-band receiver and the Pulsar Spigot spectrometer, we have set out to use the same...

A massive neutron star in the globular cluster M5 (2008)

Freire, P.C.C., Wolszczan, A., Berg, M. Van Den, Hessels, J.W.T.

We report the results of 19 years of Arecibo timing for two pulsars in the globular cluster NGC 5904 (M5), PSR B1516+02A (M5A) and PSR B1516+02B (M5B). This has resulted in the measurement of the...

Eight new MSPs in NGC 6440 and NGC 6441 (2008)

Freire, P.C.C., Ransom, S.M., Bégin, S., Stairs, I.H., Hessels, J.W.T., Frey, L.H., ...

We report the discovery of five new millisecond pulsars in the globular cluster NGC 6440 and three new ones in NGC 6441; each cluster has one previously known pulsar. Four of the new pulsars are...

A 1.4-GHz Arecibo Survey for Pulsars in Globular Clusters (2007)

Hessels, J. W. T., Ransom, S. M., Stairs, I. H., Kaspi, V. M., Freire, P. C. C.

We have surveyed all 22 known Galactic globular clusters observable with the Arecibo radio telescope and within 70kpc of the Sun for radio pulsations at ~1.4GHz. Data were taken with the Wideband...

Age constraints in the double pulsar system J0737-3039 (2007)

Lorimer, D. R., Freire, P. C. C., Stairs, I. H., Kramer, M., McLaughlin, M. A., Burgay, M., ...

We investigate the age constraints that can be placed on the double pulsar system using models for the spin-down of the first-born 22.7-ms pulsar A and the 2.77-s pulsar B with characteristic ages of...

Tests of general relativity from timing the double pulsar (2006)

Kramer, M., Stairs, I. H., Manchester, R. N., McLaughlin, M. A., Lyne, A. G., Ferdman, R. D., ...

The double pulsar system, PSR J0737-3039A/B, is unique in that both neutron stars are detectable as radio pulsars. This, combined with significantly higher mean orbital velocities and accelerations...

Arecibo and the ALFA Pulsar Survey (2006)

Van Leeuwen, J., Cordes, J. M., Lorimer, D. R., Freire, P. C. C., Camilo, F., Stairs, I. H., ...

The recently started Arecibo L-band Feed Array (ALFA) pulsar survey aims to find ~1000 new pulsars. Due to its high time and frequency resolution the survey is especially sensitive to millisecond...

Arecibo pulsar survey using ALFA. I. survey strategy and first discoveries (2006)

Cordes, J.M., Freire, P.C.C., Lorimer, D.R., Deshpande, A.A., Ramachandran, R. Et Al.

Restricted Access till January 2009. (3 year embargo). An open access version is available at arXiv.org.

Arecibo and the ALFA Pulsar Survey (2006)

Leeuwen, J. Van, Cordes, J.M., Lorimer, D.R., Freire, P.C.C., Camilo, F., Stairs, I.H., ...

The recently started Arecibo L-band Feed Array (ALFA) pulsar survey aims to find ¿ 1000 new pulsars. Due to its high time and frequency resolution the survey is especially sensitive to millisecond...

New Pulsars in the Globular Cluster M28 (2006)

Stairs, I.H., Begin, S., Ransom, S.M., Freire, P.C.C., Hessels, J.W.T., Katz, J., ...

We have discovered ten new pulsars in recent observations of the globular cluster M28 (NGC6626) with the Green Bank Telescope. M28 is now the globular cluster with the third largest population of...

The young, highly relativistic binary pulsar J1906+0746 (2005)

Lorimer, D. R., Stairs, I. H., Freire, P. C. C., Cordes, J. M., Camilo, F., Faulkner, A. J., ...

We report the discovery of PSR J1906+0746, a young 144-ms pulsar in a highly relativistic 3.98-hr orbit with an eccentricity of 0.085 and expected gravitational wave coalescence time of 300 Myr. The...

Arecibo Pulsar Survey Using ALFA. I. Survey Strategy and First Discoveries (2005)

Cordes, J. M., Freire, P. C. C., Lorimer, D. R., Camilo, F., Champion, D. J., Nice, D. J., ...

We report results from the initial stage of a long-term pulsar survey of the Galactic plane using the Arecibo L-band Feed Array (ALFA), a seven-beam receiver operating at 1.4 GHz with 0.3 GHz...

Arecibo timing and single-pulse observations of 17 pulsars (2005)

Champion, D. J., Lorimer, D. R., McLaughlin, M. A., Xilouris, K. M., Arzoumanian, Z., Freire, P. C. C., ...

We report on timing and single-pulse observations of 17 pulsars discovered at the Arecibo observatory. The highlights of our sample are the recycled pulsars J1829+2456, J1944+0907 and the drifting...

Testing GR with the Double Pulsar: Recent Results (2005)

Kramer, M., Lorimer, D. R., Lyne, A. G., McLaughlin, M., Burgay, M., D'Amico, N., ...

This first ever double pulsar system consists of two pulsars orbiting the common center of mass in a slightly eccentric orbit of only 2.4-hr duration. The pair of pulsars with pulse periods of 22 ms...

Long-term variations in the pulse emission from PSR J0737-3039B (2005)

Burgay, M., Possenti, A., Manchester, R. N., Kramer, M., McLaughlin, M. A., Lorimer, D. R., ...

Analysis of 20 months of observations at the Parkes radio telescope shows secular changes in the pulsed emission from J0737-3039B, the 2.77 s pulsar of the double-pulsar system. Pulse profiles are...

The Mean Pulse Profile of PSR J0737-3039A (2005)

Manchester, R N, Kramer, M, Possenti, A, Lyne, A G, Burgay, M, Stairs, I H, ...

General relativity predicts that the spin axes of the pulsars in the double-pulsar system (PSR J0737-3039A/B) will precess rapidly, in general leading to a change in the observed pulse profiles. We...

Double pulsar system J0737-039 and its low-frequency observations with GMRT (2004)

Joshi, B. C, McLaughlin, M. A, Lyne, A. G, Kramer, M, Lorimer, D. R, Manchester, R. N, ...

The recent discovery of two radio pulsars, with periods of 23 ms and 2.8 s, in a tight 2.4 hour highly relativistic double neutron star binary, is one of the most significant discoveries of pulsar...

The Double Pulsar System J0737-3039: Modulation of A by B at eclipse (2004)

McLaughlin, M. A., Lyne, A. G., Lorimer, D. R., Possenti, A., Manchester, R. N., Camilo, F., ...

We have investigated the eclipse of the 23-ms pulsar J0737-3039A by its 2.8-s companion PSR J0737-3039B in the recently discovered double pulsar system using data taken with the Green Bank Telescope...

The Double Pulsar System J0737-3039: Modulation of the radio emission from B by radiation from A (2004)

McLaughlin, M. A., Kramer, M., Lyne, A. G., Lorimer, D. R., Stairs, I. H., Possenti, A., ...

We have analyzed single pulses from PSR J0737-3039B, the 2.8-s pulsar in the recently discovered double pulsar system, using data taken with the Green Bank Telescope at 820 and 1400 MHz. We report...

The double pulsar -- A new testbed for relativistic gravity (2004)

Kramer, M., Lyne, A. G., Burgay, M., Possenti, A., Manchester, R. N., Camilo, F., ...

The first ever double pulsar, discovered by our team a few months ago, consists of two pulsars, one with period of 22 ms and the other with a period of 2.7 s. This binary system with a period of only...

New limits on the strong equivalence principle from two long-period circular-orbit binary pulsars (2004)

Lorimer, D. R., Freire, P. C. C.

Following a brief review of the principles of the strong equivalence principle (SEP) and tests for its violation in the strong and weak gravitational field regimes, we present preliminary results of...

Two clocks in the PSR J0737--3039 binary system and their implications for the system's origin and evolution (2004)

Lorimer, D. R., Burgay, M., Freire, P. C. C., Lyne, A. G., Kramer, M., Possenti, A., ...

As discussed elsewhere in these proceedings, the double pulsar system is a magnificent laboratory for gravitational physics and for studying pulsar magnetospheres. Here we consider the uses of having...

The PSR J0514-4002A binary system in NGC 1851 (2004)

Freire, P. C. C., Gupta, Y., Ransom, S. M., Ishwara-Chandra, C. H.

Using the Giant Metrewave Radio Telescope (GMRT), we have discovered PSR J0514-4002A, a binary millisecond pulsar in the globular cluster NGC 1851. This pulsar has a rotational period of 4.99 ms and...

Observations of PSR J2021+3651 and its X-ray Pulsar Wind Nebula G75.2+0.1 (2004)

Hessels, J. W. T., Roberts, M. S. E., Ransom, S. M., Kaspi, V. M., Romani, R. W., ...

We present results from X-ray and radio observations of the recently discovered young Vela-like pulsar PSR J2021+3651, which is coincident with the EGRET gamma-ray source GeV 2020+3658. A 19.0-ks...

A Double-Pulsar System - A Rare Laboratory for Relativistic Gravity and Plasma Physics (2004)

Lyne, A. G., Burgay, M., Kramer, M., Possenti, A., Manchester, R. N., Camilo, F., ...

The clock-like properties of pulsars moving in the gravitational fields of their unseen neutron-star companions have allowed unique tests of general relativity and provided evidence for gravitational...

The double pulsar system J0737-3039: modulation of A by B at eclipse (2004)

McLaughlin, M. A., Lyne, A. G., Lorimer, D. R., Possenti, A., Manchester, R. N., Camilo, F., ...

We have investigated the eclipse of the 23 ms pulsar, PSR J0737-3039A, by its 2.8 s companion PSR J0737-3039B in the recently discovered double pulsar system using data taken with the Green Bank...

The double pulsar system J0737-3039: modulation of A by B at eclipse (2004)

McLaughlin, M. A., Lyne, A. G., Lorimer, D. R., Possenti, A., Manchester, R. N., Camilo, F., ...

We have investigated the eclipse of the 23 ms pulsar, PSR J0737-3039A, by its 2.8 s companion PSR J0737-3039B in the recently discovered double pulsar system using data taken with the Green Bank...