NOAO >   Observing Info >   Approved Programs >   2017B-0051

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Program Information for 2017B-0051


PI: Juan Hernandez-Sant, University of Amsterdam, j.v.hernandez@uva.nl
Address: Anton Pannekoek Institute, Science Park 904, Amsterdam, North Holland 1098 XH Netherlands

CoI: Nathalie Degenaar, University of Amsterdam
CoI: Rudy Wijnaands, University of Amsterdam
CoI: Jakob Van Den Eijnden, University of Amsterdam

Title: Time-resolved photometry of sub-luminous X-ray binaries

Abstract: Sub-luminous X-ray binaries are transiently accreting neutron stars or black holes that show anomalously faint X-ray outbursts. It is expected that these objects represent rare, exciting sub-classes of X- ray binaries: i) black holes or neutron stars accreting from a H-poor companion star in a very tight orbit, which are prime targets for future gravitational wave searches and important tests for binary evolution models, or ii) neutron stars with magnetic fields strong enough to propeller the accreted gas away, a very interesting but poorly understood form of accretion. Only a few objects in each of these two sub-classes are currently known and there is high merit to search for more of them. Here we propose NOAO/LCO optical imaging observations of two sub-luminous X-ray binaries for which we obtained optical spectra; one with a strong H$alpha$ emission line and one that lacks any H feature. Our main aim is to search for optical modulations that allow us to measure the orbital periods of these two objects and hence distinguish between the above two scenarios.

Program Type: Standard/LCO

Scheduled Nights:
Run 1 (2017B):  LCO-2m/Spectral -- 16hrs


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NOAO >   Observing Info >   Approved Programs >   2017B-0051

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