CIRCE: The Canarias InfraRed Camera Experiment for the Gran Telescopio Canarias

Eikenberry, S. S.; Charcos, Miguel; Edwards, Michelle L.; Garner, Alan; Lasso-Cabrera, N. M.; Stelter, R. Deno; Marín-Franch, A.; Raines, S. N.; Ackley, K.; Bennett, John G.; Cenarro, J.; Chinn, Brian; Donoso, H. Veronica; Frommeyer, Raymond; Hanna, Kevin; Herlevich, Michael D.; Julian, Jeff; Miller, Paola; Mullin, Scott A.; Murphey, Charles H.; Packham, C.; Városi, F.; Vega, Claudia; Warner, C.; Ramaprakash, A. N.; Burse, Mahesh; Punnadi, Sunjit; Chordia, Pravin; Gerarts, Andreas; Martín, Héctor de Paz; Calero, María Martín; Scarpa, Riccardo; Acosta, Sergio Fernandez; Sánchez, William Miguel Hernández; Siegel, Benjamin M.; Pérez, Francisco Francisco; Martín, Himar D. Viera; Losada, José; Núñez, Agustín Riscos; Tejero, A.; González, Carlos E. Martín; Rodríguez, César Cabrera; Sendra, Jordi Molgó; Rodríguez, J.; Cáceres, J. Israel Fernádez; García, Luis A. Rodríguez; Lopez, Manuel Huertas; Dominguez, Raul; Gaggstatter, Tim; Lavers, A. Cabrera; Geier, S.; Pessev, Peter; Sarajedini, Ata; Castro‐Tirado, Alberto J.

doi:10.48550/arxiv.1709.05542

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“…Fast near-Infrared imaging of PSR J1023+0038 was carried out on the night of 2017 February 8 using Canarias InfraRed Camera Experiment (CIRCE; Eikenberry et al 2017) on the 10.4 m Gran Telescopio Canarias (GTC). The plate scale of the array was 0.1 arcsec pixel −1 and the image size was 1855×1365 pixels.…”

Section: High-speed Near-infrared Photometrymentioning

confidence: 99%

Evidence for hot clumpy accretion flow in the transitional millisecond pulsar PSR J1023+0038

Shahbaz

Dallilar

Garner

et al. 2018

Monthly Notices of the Royal Astronomical Society

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We present simultaneous optical and near-infrared (IR) photometry of the millisecond pulsar PSR J1023+0038 during its low-mass X-ray binary phase. The r -and K s -band light curves show rectangular, flat-bottomed dips, similar to the X-ray mode-switching (active-passive state transitions) behaviour observed previously. The cross-correlation function (CCF) of the optical and near-IR data reveals a strong, broad negative anti-correlation at negative lags, a broad positive correlation at positive lags, with a strong, positive narrow correlation superimposed. The shape of the CCF resembles the CCF of black hole X-ray binaries but the time-scales are different. The features can be explained by reprocessing and a hot accretion flow close to the neutron star's magnetospheric radius. The optical emission is dominated by the reprocessed component, whereas the near-IR emission contains the emission from plasmoids in the hot accretion flow and a reprocessed component. The rapid active-passive state transition occurs when the hot accretion flow material is channelled onto the neutron star and is expelled from its magnetosphere. During the transition the optical reprocessing component decreases resulting in the removal of a blue spectral component. The accretion of clumpy material through the magnetic barrier of the neutron star produces the observed near-IR/optical CCF and variability. The dip at negative lags corresponds to the suppression of the near-IR synchrotron component in the hot flow, whereas the broad positive correlation at positive lags is driven by the increased synchrotron emission of the outflowing plasmoids. The narrow peak in the CCF is due to the delayed reprocessed component, enhanced by the increased X-ray emission.

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Section: High-speed Near-infrared Photometrymentioning

confidence: 99%