The LOFT perspective on neutron star thermonuclear bursts: White paper in support of the mission concept of the large observatory for X-ray timing

J J M In’t Zand ,F B S Paerels,S E Woosley,J José ,N Degenaar ,Andrew Cumming ,S Zhang ,A Różáńska ,Tod E Strohmayer ,Simin Mahmoodifar ,M Coleman Miller ,D K Galloway ,D R Ballantyne ,Juri Poutanen ,H Schatz ,D Altamirano ,Y Cavecchi ,L Keek ,J Chenevez ,Nevin N Weinberg ,Deepto Chakrabarty ,Mariano Méndez ,Wayne H Yu ,Christopher M Malone ,A Heger ,S Bhattacharyya ,Edward F Brown ,M Linares ,V Suleimanov ,Anna L Watts ,F K Thielemann ,M Serino ,M Falanga ,M Zingale

doi:10.2172/1167485

Abstract

The Large Area Detector (LAD) on the Large Observatory For X-ray Timing ( LOFT ), with a 8.5 m 2 photon- collecting area in the 2–30 keV bandpass at CCD-class spectral resolving power (λ/Δλ = 10 – 100), is designed for optimum performance on bright X-ray sources. Thus, it is well-suited to study thermonuclear X-ray bursts from Galactic neutron stars. These bursts will typically yield 2 x 105 photon detections per second in the LAD, which is at least 15 times more than with any other instrument past, current or anticipated. The Wide Field Monitor (WFM) foreseen for LOFT uniquely combines 2–50 keV imaging with large (30%) prompt sky coverage. This will enable the detection of tens of thousands of thermonuclear X-ray bursts during a 3-yr mission, including tens of superbursts. Both numbers are similar or more than the current database gathered in 50 years of X-ray astronomy.

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