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XMM monitoring of the state transition of the supersoft source CAL 83

This paper discusses the monitoring and analysis of state transitions in the supersoft source CAL 83 using XMM observations. It explores the variability patterns and spectral changes in the X-ray and optical domains, providing insights into the source's physical properties and accretion processes.

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XMM monitoring of the state transition of the supersoft source CAL 83

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  1. XMM monitoring of the state transition of the supersoft source CAL 83 Robert Schwarz Astrophysikalisches Institut Potsdam Jochen Greiner MPE Garching Gloria Sala Uni Barcelona Ronald Mennickent Uni Concepcion Super Soft X-ray Sources – New developments ESAC, May 18, 2009

  2. Canonical SSS source in the LMC 1-day orbital period Low amplitude orbital modulation in optical and X-rays Inclination < 30 Tentative X-ray pulsations at 38 min Introducing CAL 83

  3. Good fit to the data with a NLTE model (Lanz et al. 2004) log g = 8.5, Teff = 500 kK Suggests a massive WD of 1.3 Msun High-resolution X-ray spectrum

  4. MACHO light curve (Greiner & di Stefano 2002) X-ray off-states in CAL 83

  5. ObservationsofRXJ 0513-69 Short transition times only high or low states X-ray on state shorter than off state Anti-correlated brightness changes in SSS

  6. Anti-correlated brightness changes in SSS Models • Expansion and cooling of the envelope • Limit cycle regulated by changing mass accretion rate Reinsch et al. 2000 • Radius/temperature changes of the WD • Increased irradiation of the outer disk Hachisu & Kato 2003 • Stripping of the companions surface by a strong wind • X-ray off: wind absorption optical high: expanded disk

  7. Wind regulated accretion in RXJ 0513-69

  8. Smarts/XMM monitoring of CAL 83

  9. Similar pattern Different timescale Comparison with MACHO observations

  10. Recurrence time: 430 days Duty cycle: 50% Long term behaviour from OGLE

  11. Sharp drop (t < 1 d) to intermediate brightness level Immediate recovery (t ~ 20 d) X-ray detection during optical high state Anti-correlation of optical and X-ray over a wide range X-ray/optical lightcurves

  12. Low resolution X-ray spectroscopy Blackbody fits Correlation between Nh and kTbb

  13. Black: April 2000 (Lanz et al. 2004) Red: August 2008 High state RGS spectrum

  14. Free fits: kTbb varies from 25 to 33 eV fixing Nh to 8 x 1020 cm-2 kTbb varies from 23 to 37 eV Luminosity increases and radius shrinks changes by factor of 2 Spectral variation

  15. Changes of the X-ray spectra can not explain the UV variation.. Broadband spectral energy distribution

  16. Fix temperature and luminosity to the value of the high state spectrum Cold absorption fails Ionized absorber Nh= 4 1022 cm-2 X-ray variation by strong absorption only?

  17. New complex variability patterns 1. short repetition time 2. Long transitions to optical high state Long term variability Ambiguous X-ray spectroscopy 50% temperature change or strong ionized absorber Tight anti-correlation between optical and X-rays Summary

  18. Ende…

  19. RGS Spectrum

  20. PN spectrum

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