The optical & IR light curve of PSR B1957+20

M. T. Reynolds; P. J. Callanan; A. S. Fruchter; M. A.P. Torres; M. E. Beer; R. A. Gibbons

doi:10.1017/S174392130600785X

The optical & IR light curve of PSR B1957+20

M. T. Reynolds
, P. J. Callanan
, A. S. Fruchter
, M. A.P. Torres
, M. E. Beer
, R. A. Gibbons

School of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We present a new analysis of the light curve of the secondary star in the PSR B1957+20 system. Combining previous data and new data points at minimum from the Hubble Space Telescope, we have 100% coverage in the R-band. We also have a number of new K₃ band data points, which we use to constrain the IR magnitude of the system. We model this with the Eclipsing Light Curve code. From the modeling we obtain colour information about the secondary at minimum in BVRI & K. For our best fit model we are able to constrain the system inclination to 66.6 ±2.1° for pulsar masses ranging from 1.35-1.9 M_⊙. The pulsar mass is unconstrained. We also find that the secondary is not filling its Roche lobe, which has important consequences for evolutionary models of this system. The temperature of the un-irradiated side of the companion is in agreement with previous estimates.

Original language	English
Pages (from-to)	55-56
Number of pages	2
Journal	Proceedings of the International Astronomical Union
Volume	1
Issue number	S230
DOIs	https://doi.org/10.1017/S174392130600785X
Publication status	Published - 2005

Keywords

Pulsars: individual (PSR B1957+20)
X-rays: binaries

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10.1017/S174392130600785X

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@article{231a529ff22b4527b09710594e802e56,

title = "The optical \& IR light curve of PSR B1957+20",

abstract = "We present a new analysis of the light curve of the secondary star in the PSR B1957+20 system. Combining previous data and new data points at minimum from the Hubble Space Telescope, we have 100\% coverage in the R-band. We also have a number of new K3 band data points, which we use to constrain the IR magnitude of the system. We model this with the Eclipsing Light Curve code. From the modeling we obtain colour information about the secondary at minimum in BVRI \& K. For our best fit model we are able to constrain the system inclination to 66.6 ±2.1° for pulsar masses ranging from 1.35-1.9 M⊙. The pulsar mass is unconstrained. We also find that the secondary is not filling its Roche lobe, which has important consequences for evolutionary models of this system. The temperature of the un-irradiated side of the companion is in agreement with previous estimates.",

keywords = "Pulsars: individual (PSR B1957+20), X-rays: binaries",

author = "Reynolds, \{M. T.\} and Callanan, \{P. J.\} and Fruchter, \{A. S.\} and Torres, \{M. A.P.\} and Beer, \{M. E.\} and Gibbons, \{R. A.\}",

year = "2005",

doi = "10.1017/S174392130600785X",

language = "English",

volume = "1",

pages = "55--56",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Cambridge University Press",

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TY - JOUR

T1 - The optical & IR light curve of PSR B1957+20

AU - Reynolds, M. T.

AU - Callanan, P. J.

AU - Fruchter, A. S.

AU - Torres, M. A.P.

AU - Beer, M. E.

AU - Gibbons, R. A.

PY - 2005

Y1 - 2005

N2 - We present a new analysis of the light curve of the secondary star in the PSR B1957+20 system. Combining previous data and new data points at minimum from the Hubble Space Telescope, we have 100% coverage in the R-band. We also have a number of new K3 band data points, which we use to constrain the IR magnitude of the system. We model this with the Eclipsing Light Curve code. From the modeling we obtain colour information about the secondary at minimum in BVRI & K. For our best fit model we are able to constrain the system inclination to 66.6 ±2.1° for pulsar masses ranging from 1.35-1.9 M⊙. The pulsar mass is unconstrained. We also find that the secondary is not filling its Roche lobe, which has important consequences for evolutionary models of this system. The temperature of the un-irradiated side of the companion is in agreement with previous estimates.

AB - We present a new analysis of the light curve of the secondary star in the PSR B1957+20 system. Combining previous data and new data points at minimum from the Hubble Space Telescope, we have 100% coverage in the R-band. We also have a number of new K3 band data points, which we use to constrain the IR magnitude of the system. We model this with the Eclipsing Light Curve code. From the modeling we obtain colour information about the secondary at minimum in BVRI & K. For our best fit model we are able to constrain the system inclination to 66.6 ±2.1° for pulsar masses ranging from 1.35-1.9 M⊙. The pulsar mass is unconstrained. We also find that the secondary is not filling its Roche lobe, which has important consequences for evolutionary models of this system. The temperature of the un-irradiated side of the companion is in agreement with previous estimates.

KW - Pulsars: individual (PSR B1957+20)

KW - X-rays: binaries

UR - https://www.scopus.com/pages/publications/63549104952

U2 - 10.1017/S174392130600785X

DO - 10.1017/S174392130600785X

M3 - Article

AN - SCOPUS:63549104952

SN - 1743-9213

VL - 1

SP - 55

EP - 56

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

IS - S230

ER -

The optical & IR light curve of PSR B1957+20

Abstract

Keywords

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