Swift /XRT orbital monitoring of the candidate supergiant fast X-ray transient IGR J17354-3255

L. Ducci; P. Romano; P. Esposito; E. Bozzo; H. A. Krimm; S. Vercellone; V. Mangano; J. A. Kennea

doi:10.1051/0004-6361/201321635

Swift /XRT orbital monitoring of the candidate supergiant fast X-ray transient IGR J17354-3255

L. Ducci, P. Romano, P. Esposito, E. Bozzo, H. A. Krimm, S. Vercellone, V. Mangano, J. A. Kennea

Astronomy & Astrophysics

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Abstract

We report on the Swift/X-ray Telescope (XRT) monitoring of the field of view around the candidate supergiant fast X-ray transient (SFXT) IGR J17354-3255, which is positionally associated with the AGILE/GRID gamma-ray transient AGL J1734-3310. Our observations, which cover 11 days for a total on-source exposure of ~24 ks, span 1.2 orbital periods (P_orb = 8.4474 d) and are the first sensitive monitoring of this source in the soft X-rays. These new data allow us to exploit the timing variability properties of the sources in the field to unambiguously identify the soft X-ray counterpart of IGR J17354-3255. The soft X-ray light curve shows a moderate orbital modulation and a dip. We investigated the nature of the dip by comparing the X-ray light curve with the prediction of the Bondi-Hoyle-Lyttleton accretion theory, assuming both spherical and nonspherical symmetry of the outflow from the donor star. We found that the dip cannot be explained with the X-ray orbital modulation. We propose that an eclipse or the onset of a gated mechanism is the most likely explanation for the observed light curve.

Original language	English (US)
Article number	A72
Journal	Astronomy and Astrophysics
Volume	556
DOIs	https://doi.org/10.1051/0004-6361/201321635
State	Published - 2013

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361/201321635

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@article{d8b1725546ab4edcbc59da972156cd43,

title = "Swift /XRT orbital monitoring of the candidate supergiant fast X-ray transient IGR J17354-3255",

abstract = "We report on the Swift/X-ray Telescope (XRT) monitoring of the field of view around the candidate supergiant fast X-ray transient (SFXT) IGR J17354-3255, which is positionally associated with the AGILE/GRID gamma-ray transient AGL J1734-3310. Our observations, which cover 11 days for a total on-source exposure of ~24 ks, span 1.2 orbital periods (Porb = 8.4474 d) and are the first sensitive monitoring of this source in the soft X-rays. These new data allow us to exploit the timing variability properties of the sources in the field to unambiguously identify the soft X-ray counterpart of IGR J17354-3255. The soft X-ray light curve shows a moderate orbital modulation and a dip. We investigated the nature of the dip by comparing the X-ray light curve with the prediction of the Bondi-Hoyle-Lyttleton accretion theory, assuming both spherical and nonspherical symmetry of the outflow from the donor star. We found that the dip cannot be explained with the X-ray orbital modulation. We propose that an eclipse or the onset of a gated mechanism is the most likely explanation for the observed light curve.",

author = "L. Ducci and P. Romano and P. Esposito and E. Bozzo and Krimm, {H. A.} and S. Vercellone and V. Mangano and Kennea, {J. A.}",

note = "Funding Information: We thank the anomymous referee for constructive comments which helped to improve the paper. We thank the Swift team duty scientists and science planners. We also thank the remainder of the Swift XRT and BAT teams, S. D. Barthelmy, J. A. Nousek, and D. N. Burrows in particular, for their invaluable help and support of the SFXT project as a whole. We thank P.A. Evans and C. Ferrigno for helpful discussions. We acknowledge financial contribution from the contract ASI-INAF I/004/11/0. L.D. acknowledges support by the Deutsche Forschungsgemeinschaft through the Emmy Noether Research Grant SA 2131/1. This work made use of the results of the Swift /BAT hard X-ray transient monitor: http://swift.gsfc.nasa.gov/docs/swift/results/transients/",

year = "2013",

doi = "10.1051/0004-6361/201321635",

language = "English (US)",

volume = "556",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - Swift /XRT orbital monitoring of the candidate supergiant fast X-ray transient IGR J17354-3255

AU - Ducci, L.

AU - Romano, P.

AU - Esposito, P.

AU - Bozzo, E.

AU - Krimm, H. A.

AU - Vercellone, S.

AU - Mangano, V.

AU - Kennea, J. A.

N1 - Funding Information: We thank the anomymous referee for constructive comments which helped to improve the paper. We thank the Swift team duty scientists and science planners. We also thank the remainder of the Swift XRT and BAT teams, S. D. Barthelmy, J. A. Nousek, and D. N. Burrows in particular, for their invaluable help and support of the SFXT project as a whole. We thank P.A. Evans and C. Ferrigno for helpful discussions. We acknowledge financial contribution from the contract ASI-INAF I/004/11/0. L.D. acknowledges support by the Deutsche Forschungsgemeinschaft through the Emmy Noether Research Grant SA 2131/1. This work made use of the results of the Swift /BAT hard X-ray transient monitor: http://swift.gsfc.nasa.gov/docs/swift/results/transients/

PY - 2013

Y1 - 2013

N2 - We report on the Swift/X-ray Telescope (XRT) monitoring of the field of view around the candidate supergiant fast X-ray transient (SFXT) IGR J17354-3255, which is positionally associated with the AGILE/GRID gamma-ray transient AGL J1734-3310. Our observations, which cover 11 days for a total on-source exposure of ~24 ks, span 1.2 orbital periods (Porb = 8.4474 d) and are the first sensitive monitoring of this source in the soft X-rays. These new data allow us to exploit the timing variability properties of the sources in the field to unambiguously identify the soft X-ray counterpart of IGR J17354-3255. The soft X-ray light curve shows a moderate orbital modulation and a dip. We investigated the nature of the dip by comparing the X-ray light curve with the prediction of the Bondi-Hoyle-Lyttleton accretion theory, assuming both spherical and nonspherical symmetry of the outflow from the donor star. We found that the dip cannot be explained with the X-ray orbital modulation. We propose that an eclipse or the onset of a gated mechanism is the most likely explanation for the observed light curve.

AB - We report on the Swift/X-ray Telescope (XRT) monitoring of the field of view around the candidate supergiant fast X-ray transient (SFXT) IGR J17354-3255, which is positionally associated with the AGILE/GRID gamma-ray transient AGL J1734-3310. Our observations, which cover 11 days for a total on-source exposure of ~24 ks, span 1.2 orbital periods (Porb = 8.4474 d) and are the first sensitive monitoring of this source in the soft X-rays. These new data allow us to exploit the timing variability properties of the sources in the field to unambiguously identify the soft X-ray counterpart of IGR J17354-3255. The soft X-ray light curve shows a moderate orbital modulation and a dip. We investigated the nature of the dip by comparing the X-ray light curve with the prediction of the Bondi-Hoyle-Lyttleton accretion theory, assuming both spherical and nonspherical symmetry of the outflow from the donor star. We found that the dip cannot be explained with the X-ray orbital modulation. We propose that an eclipse or the onset of a gated mechanism is the most likely explanation for the observed light curve.

UR - http://www.scopus.com/inward/record.url?scp=84881151308&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84881151308&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201321635

DO - 10.1051/0004-6361/201321635

M3 - Article

AN - SCOPUS:84881151308

SN - 0004-6361

VL - 556

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A72

ER -

Swift /XRT orbital monitoring of the candidate supergiant fast X-ray transient IGR J17354-3255

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