The puzzling case of the accreting millisecond X-ray pulsar IGR J00291+5934: flaring optical emission during quiescence

Tiziana Di Salvo, Muñoz-Darias, Rea, Campana, Baglio, Torres, D'Avanzo, Burderi, Torres, Papitto

Risultato della ricerca: Article

Abstract

We present an optical (gri) study during quiescence of the accreting millisecond X-ray pulsar IGR J00291+5934 performed with the 10.4 m Gran Telescopio Canarias (GTC) in August 2014. Although the source was in quiescence at the time of our observations, it showed a strong optical flaring activity, more pronounced in bluer filters (i.e. the g-band). After subtracting the flares, we tentatively recovered a sinusoidal modulation at the system orbital period in all bands, even when a significant phase shift with respect to an irradiated star, typical of accreting millisecond X-ray pulsars, was detected. We conclude that the observed flaring could be a manifestation of the presence of an accretion disc in the system. The observed light curve variability could be explained by the presence of a superhump, which might be another proof of the formation of an accretion disc. In particular, the disc at the time of our observations was probably preparing the new outburst of the source, which occurred a few months later, in 2015.
Lingua originaleEnglish
pagine (da-a)A109-1-A109-6
Numero di pagine6
RivistaASTRONOMY & ASTROPHYSICS
Volume600
Stato di pubblicazionePublished - 2017

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accretion disks
pulsars
light emission
accretion
optical activity
outburst
flares
light curve
x rays
phase shift
filter
modulation
filters
stars
orbitals
flaring

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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The puzzling case of the accreting millisecond X-ray pulsar IGR J00291+5934: flaring optical emission during quiescence. / Di Salvo, Tiziana; Muñoz-Darias; Rea; Campana; Baglio; Torres; D'Avanzo; Burderi; Torres; Papitto.

In: ASTRONOMY & ASTROPHYSICS, Vol. 600, 2017, pag. A109-1-A109-6.

Risultato della ricerca: Article

Di Salvo, T, Muñoz-Darias, Rea, Campana, Baglio, Torres, D'Avanzo, Burderi, Torres & Papitto 2017, 'The puzzling case of the accreting millisecond X-ray pulsar IGR J00291+5934: flaring optical emission during quiescence', ASTRONOMY & ASTROPHYSICS, vol. 600, pagg. A109-1-A109-6.
Di Salvo, Tiziana ; Muñoz-Darias ; Rea ; Campana ; Baglio ; Torres ; D'Avanzo ; Burderi ; Torres ; Papitto. / The puzzling case of the accreting millisecond X-ray pulsar IGR J00291+5934: flaring optical emission during quiescence. In: ASTRONOMY & ASTROPHYSICS. 2017 ; Vol. 600. pagg. A109-1-A109-6.
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abstract = "We present an optical (gri) study during quiescence of the accreting millisecond X-ray pulsar IGR J00291+5934 performed with the 10.4 m Gran Telescopio Canarias (GTC) in August 2014. Although the source was in quiescence at the time of our observations, it showed a strong optical flaring activity, more pronounced in bluer filters (i.e. the g-band). After subtracting the flares, we tentatively recovered a sinusoidal modulation at the system orbital period in all bands, even when a significant phase shift with respect to an irradiated star, typical of accreting millisecond X-ray pulsars, was detected. We conclude that the observed flaring could be a manifestation of the presence of an accretion disc in the system. The observed light curve variability could be explained by the presence of a superhump, which might be another proof of the formation of an accretion disc. In particular, the disc at the time of our observations was probably preparing the new outburst of the source, which occurred a few months later, in 2015.",
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TY - JOUR

T1 - The puzzling case of the accreting millisecond X-ray pulsar IGR J00291+5934: flaring optical emission during quiescence

AU - Di Salvo, Tiziana

AU - Muñoz-Darias, null

AU - Rea, null

AU - Campana, null

AU - Baglio, null

AU - Torres, null

AU - D'Avanzo, null

AU - Burderi, null

AU - Torres, null

AU - Papitto, null

PY - 2017

Y1 - 2017

N2 - We present an optical (gri) study during quiescence of the accreting millisecond X-ray pulsar IGR J00291+5934 performed with the 10.4 m Gran Telescopio Canarias (GTC) in August 2014. Although the source was in quiescence at the time of our observations, it showed a strong optical flaring activity, more pronounced in bluer filters (i.e. the g-band). After subtracting the flares, we tentatively recovered a sinusoidal modulation at the system orbital period in all bands, even when a significant phase shift with respect to an irradiated star, typical of accreting millisecond X-ray pulsars, was detected. We conclude that the observed flaring could be a manifestation of the presence of an accretion disc in the system. The observed light curve variability could be explained by the presence of a superhump, which might be another proof of the formation of an accretion disc. In particular, the disc at the time of our observations was probably preparing the new outburst of the source, which occurred a few months later, in 2015.

AB - We present an optical (gri) study during quiescence of the accreting millisecond X-ray pulsar IGR J00291+5934 performed with the 10.4 m Gran Telescopio Canarias (GTC) in August 2014. Although the source was in quiescence at the time of our observations, it showed a strong optical flaring activity, more pronounced in bluer filters (i.e. the g-band). After subtracting the flares, we tentatively recovered a sinusoidal modulation at the system orbital period in all bands, even when a significant phase shift with respect to an irradiated star, typical of accreting millisecond X-ray pulsars, was detected. We conclude that the observed flaring could be a manifestation of the presence of an accretion disc in the system. The observed light curve variability could be explained by the presence of a superhump, which might be another proof of the formation of an accretion disc. In particular, the disc at the time of our observations was probably preparing the new outburst of the source, which occurred a few months later, in 2015.

UR - http://hdl.handle.net/10447/226888

UR - http://adsabs.harvard.edu/abs/2017A&A...600A.109B

M3 - Article

VL - 600

SP - A109-1-A109-6

JO - ASTRONOMY & ASTROPHYSICS

JF - ASTRONOMY & ASTROPHYSICS

SN - 0004-6361

ER -