The optical counterpart of the bright X-ray transient Swift J1745-26

T. Mounoz-Darias; Antonio de Ugarte Postigo; D.M. Russell; S. Guziy; J. Gorosabel; J. Casares; M.A. Padilla; P.A. Charles; R.P. Fender; T.M. Belloni; Christina Thöne

doi:10.1093/mnras/stt532

The optical counterpart of the bright X-ray transient Swift J1745-26

T. Mounoz-Darias, Antonio de Ugarte Postigo, D.M. Russell, S. Guziy, J. Gorosabel, J. Casares, M.A. Padilla, P.A. Charles, R.P. Fender, T.M. Belloni, Christina Thöne

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13 Citationer (Scopus)

Abstract

We present a 30-day monitoring campaign of the optical counterpart of the bright X-ray transient Swift J1745-26, starting only 19min after the discovery of the source.We observe the system peaking at i~17.6 on day six (MJD 561 92) to then decay at a rate of ~0.04 mag d^-1. We show that the optical peak occurs at least 3 d later than the hard X-ray (15-50 keV) flux peak. Our measurements result in an outburst amplitude greater than 4.3 mag, which favours an orbital period ≲21 h and a companion star with a spectral type later than ~A0. Spectroscopic observations taken with the Gran Telescopio de Canarias 10.4 m telescope reveal a broad (full width at half-maximum ~1100 km s^-1), double-peaked Ha emission line from which we constrain the radial velocity semi-amplitude of the donor to be K₂ > 250 km s^-1. The breadth of the line and the observed optical and X-ray fluxes suggest that Swift J1745-26 is a new black hole candidate located closer than ~7 kpc.

Originalsprog	Engelsk
Tidsskrift	Monthly Notices of the Royal Astronomical Society
Vol/bind	432
Udgave nummer	2
Sider (fra-til)	1133-1137
ISSN	0035-8711
DOI	https://doi.org/10.1093/mnras/stt532
Status	Udgivet - 2 jun. 2013

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10.1093/mnras/stt532

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title = "The optical counterpart of the bright X-ray transient Swift J1745-26",

abstract = "We present a 30-day monitoring campaign of the optical counterpart of the bright X-ray transient Swift J1745-26, starting only 19min after the discovery of the source.We observe the system peaking at i~17.6 on day six (MJD 561 92) to then decay at a rate of ~0.04 mag d-1. We show that the optical peak occurs at least 3 d later than the hard X-ray (15-50 keV) flux peak. Our measurements result in an outburst amplitude greater than 4.3 mag, which favours an orbital period ≲21 h and a companion star with a spectral type later than ~A0. Spectroscopic observations taken with the Gran Telescopio de Canarias 10.4 m telescope reveal a broad (full width at half-maximum ~1100 km s-1), double-peaked Ha emission line from which we constrain the radial velocity semi-amplitude of the donor to be K2 > 250 km s-1. The breadth of the line and the observed optical and X-ray fluxes suggest that Swift J1745-26 is a new black hole candidate located closer than ~7 kpc.",

author = "T. Mounoz-Darias and {Ugarte Postigo}, {Antonio de} and D.M. Russell and S. Guziy and J. Gorosabel and J. Casares and M.A. Padilla and P.A. Charles and R.P. Fender and T.M. Belloni and Christina Th{\"o}ne",

year = "2013",

month = jun,

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doi = "10.1093/mnras/stt532",

language = "English",

volume = "432",

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journal = "Royal Astronomical Society. Monthly Notices",

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TY - JOUR

T1 - The optical counterpart of the bright X-ray transient Swift J1745-26

AU - Mounoz-Darias, T.

AU - Ugarte Postigo, Antonio de

AU - Russell, D.M.

AU - Guziy, S.

AU - Gorosabel, J.

AU - Casares, J.

AU - Padilla, M.A.

AU - Charles, P.A.

AU - Fender, R.P.

AU - Belloni, T.M.

AU - Thöne, Christina

PY - 2013/6/2

Y1 - 2013/6/2

N2 - We present a 30-day monitoring campaign of the optical counterpart of the bright X-ray transient Swift J1745-26, starting only 19min after the discovery of the source.We observe the system peaking at i~17.6 on day six (MJD 561 92) to then decay at a rate of ~0.04 mag d-1. We show that the optical peak occurs at least 3 d later than the hard X-ray (15-50 keV) flux peak. Our measurements result in an outburst amplitude greater than 4.3 mag, which favours an orbital period ≲21 h and a companion star with a spectral type later than ~A0. Spectroscopic observations taken with the Gran Telescopio de Canarias 10.4 m telescope reveal a broad (full width at half-maximum ~1100 km s-1), double-peaked Ha emission line from which we constrain the radial velocity semi-amplitude of the donor to be K2 > 250 km s-1. The breadth of the line and the observed optical and X-ray fluxes suggest that Swift J1745-26 is a new black hole candidate located closer than ~7 kpc.

AB - We present a 30-day monitoring campaign of the optical counterpart of the bright X-ray transient Swift J1745-26, starting only 19min after the discovery of the source.We observe the system peaking at i~17.6 on day six (MJD 561 92) to then decay at a rate of ~0.04 mag d-1. We show that the optical peak occurs at least 3 d later than the hard X-ray (15-50 keV) flux peak. Our measurements result in an outburst amplitude greater than 4.3 mag, which favours an orbital period ≲21 h and a companion star with a spectral type later than ~A0. Spectroscopic observations taken with the Gran Telescopio de Canarias 10.4 m telescope reveal a broad (full width at half-maximum ~1100 km s-1), double-peaked Ha emission line from which we constrain the radial velocity semi-amplitude of the donor to be K2 > 250 km s-1. The breadth of the line and the observed optical and X-ray fluxes suggest that Swift J1745-26 is a new black hole candidate located closer than ~7 kpc.

U2 - 10.1093/mnras/stt532

DO - 10.1093/mnras/stt532

M3 - Journal article

SN - 0035-8711

VL - 432

SP - 1133

EP - 1137

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

IS - 2

ER -

The optical counterpart of the bright X-ray transient Swift J1745-26

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