Gaseous debris discs around white dwarfs

Transcription

1 Gaseous debris discs around white dwarfs Christopher J. Manser Collaborators: Boris Gänsicke, Tom Marsh, Detlev Koester, Dimitri Veras, Nicola Pietro Gentile Fusillo Saturn to scale Artists impression of SDSS J by Mark Garlick. Image of Saturn from NASA s Cassini mission, NASA image saturn_malmercassini_5m.jpg

2 Talk Outline One - The gaseous debris disc around SDSS J Few - Common variability of gaseous debris discs Many - Frequency of gaseous debris discs around white dwarfs

3 Remnant Planetary Systems SDSS J Observable He atom Heavy atom HST/COS Jura & Young, 214, Annu. Rev. Earth Planet. Sci., 42, 45 JWST/MIRI Planetary debris White C and dwarf O C and O Roche limit JWST/MIRI Dust sublimation Photospheric absorption Gänsicke et. al. 212, MNRAS, 424, 333

4 Remnant Planetary Systems SDSS J Observable He atom Heavy atom HST/COS Jura & Young, 214, Annu. Rev. Earth Planet. Sci., 42, 45 JWST/MIRI Planetary debris White C and dwarf O C and O Roche limit JWST/MIRI Dust sublimation Photospheric absorption Dust Brinkworth et. al. 29, ApJ, 696, 142 Gänsicke et. al. 212, MNRAS, 424, 333

5 Remnant Planetary Systems SDSS J Observable Observable He atom Heavy atom He atom Heavy atom HST/COS HST/COS Jura & Young, 214, Annu. Rev. Earth Planet. Sci., 42, 45 Norm Flux Ca ii triplet Gas JWST/MIRI Roche limit Roche limit Planetary debris Planetary debris JWST/MIRI JWST/MIRI Dust sublimation Dust sublimation White C and dwarf O C and O Photospheric absorption Dust Brinkworth et. al. 29, ApJ, 696, 142 Gänsicke et. al. 212, MNRAS, 424, 333

6 The gaseous component of the debris disc Ca ii triplet 2.5 Fλ [1 16 erg cm 2 s 1 Å 1 ] Norm Flux SDSS J Gänsicke et. al. 26, Science, 314, 198

7 Accretion disc in a binary

8 Accretion disc in a binary

9 The gaseous component of the debris disc Ca ii triplet 2.5 Fλ [1 16 erg cm 2 s 1 Å 1 ] Norm Flux SDSS J Gänsicke et. al. 26, Science, 314, 198

10 1 out of

11 Doppler Tomography Marsh & Horne, 1988, MNRAS, 235, 269

12 Doppler Tomography }{{} vy [km s 1 ] R.2 R v x [km s 1 ] Manser et. al. 216, MNRAS, 455,

13 Doppler Tomography }{{} vy [km s 1 ] R.2 R v x [km s 1 ] Manser et. al. 216, MNRAS, 455,

14 Doppler Tomography v y [km s 1 ] v x [km s 1 ] Red }{{} R.2 R Manser et. al. 216, MNRAS, 455, 4467

15 Doppler Tomography v y [km s 1 ] v x [km s 1 ] Red }{{} R.2 R Manser et. al. 216, MNRAS, 455, 4467

16 Doppler Tomography }{{} vy [km s 1 ] R.2 R v x [km s 1 ] Manser et. al. 216, MNRAS, 455,

17 New observations in March and May March May

18 A Whole New Map }{{} vy [km s 1 ] R.2 R v x [km s 1 ] Manser et. al. in prep

19 Some more comparing }{{} }{{} vy [km s 1 ] R.2 R vy [km s 1 ] R.2 R v x [km s 1 ] Manser et. al. in prep. New (2 epochs) v x [km s 1 ] Old (18 epochs)

20 Spiral? }{{} vy [km s 1 ] R.2 R v x [km s 1 ]

21 Even newer data! May March

22 Reached half way? Flipped Velocity [km/s]

23 Coadded X-Shooter spectrum Ca ii 8498 ; 8542; 8662 Å O i 8446 Å Ca K 3934 Å CaH 3969Å Mg ii 4481 Å Fe ii 4924 Å Feii 518 Å Fe ii 5169 ; 5198 Å Feii 5235 ; 5276 ; 5317 Å Si ii 541 ; 556 Å O i 7772 ; 7774 ; 7775 Å O i 8446 Å Mg i 886 ; O i 882 Å O i &Mgii blend Mg ii 7877 ; 7896 Å O i blend Ca ii 8912 ; 8927 Å

24 April 21 Hubble Spectrum Gänsicke et. al. 212, MNRAS, 424, 333

25 March 216 Hubble Spectrum Manser et. al. in prep.

26 Comparing the two Manser et. al. in prep.

27 Circumstellar gas Si IV Manser et. al. in prep.

28 Circumstellar gas }{{} vy [km s 1 ] R.2 R v x [km s 1 ] Si IV Manser et. al. in prep.

29 Other variable gas discs SDSS J Manser et. al. 216, MNRAS, 455, 4467

30 Morphologically variable SDSS J SDSS J SDSS 24 WHT UVES UVES Gemini S X-shooter X-shooter Wavelength (Å) Wilson et. al. 214, MNRAS, 451, 3237 Manser et. al. 216, MNRAS, 455, 4467

31 Morphologically variable SDSS J SDSS J SDSS J SDSS SDSS 6.5 WHT UVES WHT UVES Gemini S X-shooter WHT 21-4 WHT X-Shooter X-shooter X-Shooter Wavelength (Å) SDSS Wavelength (Å) Wilson et. al. 215, MNRAS, 451, 3237 Manser et. al. 216, MNRAS, 455, 4467 Manser et. al. 216, MNRAS,

32 Variable strength SDSS J Wilson et. al. 214, MNRAS, 445, 1878

33 Variable strength SDSS J SDSS J Wilson et. al. 214, MNRAS, 445, Manser et. al. 216, MNRAS, 455, 4467

34 Variability e - Gaseous emission Name Type ) Features a - Gaseous absorption SDSS J SDSS J SDSS J959 2 SDSS J WD SDSS J HE SDSS J DB DB DA DA DA DA DBA DA e e, v e, v e, v e e, a, v e e, v v - Spectroscopic or photometric Variability Wilson et. al. 214, MNRAS, 445, 1878

35 Variability SDSS WHT 5.5 SDSS WHT Name SDSS J SDSS J SDSS J959 2 SDSS J WD SDSS J HE SDSS J Type DB DB DA DA DA DA DBA DA ) Features e e, v e, v e, v e e, a, v e e, v Normalized Flux WHT X-Shooter X-Shooter SDSS.9 Wavelength (Å) Wavelength (Å) of HE The MagE data have been smoothed with a 5 pixel boxcar th Melis et. al. 212, ApJL, 715, L

36 Detected Remnant Planetary System statistics Metal pollution Koester et. al %

37 Detected Remnant Planetary System statistics Metal pollution Koester et. al % Dusty disc Farihi et al. 29; Rocchetto et al %

38 Detected Remnant Planetary System statistics Metal pollution Koester et. al % Dusty disc Farihi et al. 29; Rocchetto et al % Gaseous component??? %

39 The sample Figure 2. Colour colour diagrams illustrating the location of the DR7 spectroscopic objects that we used as training sample for our selection method. DA white dwarfs, non-da white dwarfs, NLHS and quasars are shown as blue, yellow, red and green dots, respectively. The colour cuts that define our initial broad selection from Table 2 are overlaid as red lines. Objects outside this selection were not classified and are therefore plotted as grey dots. Gentile Fusillo et. al. 215, MNRAS, 448, 226

40 The sample s searching for Ca ii bris disc. We also list but no observation of -.5 Exposure time [s] u g u g DA DB DAB Other SDSS J SDSS J SDSS J SDSS J SDSS J SDSS J SDSS J g g rr Figure 1. u g, g r magnitude plot of the magnitude/colour

41 The frequency of gaseous discs Ca ii triplet 979 single white dwarfs Fλ [1 16 erg cm 2 s 1 Å 1 ] Norm Flux

42 The frequency of gaseous discs Ca ii triplet 979 single white dwarfs Fλ [1 16 erg cm 2 s 1 Å 1 ] Norm Flux Gasesous components

43 The frequency of gaseous discs Ca ii triplet 979 single white dwarfs Fλ [1 16 erg cm 2 s 1 Å 1 ] Norm Flux Gasesous components Frequency of observable gaseous debris discs at white dwarfs % -.2

44 Detected Remnant Planetary System statistics Metal pollution Koester et. al % Dusty disc Farihi et al. 29; Rocchetto et al % Gaseous component.7 %

45 Detected Remnant Planetary System statistics Metal pollution Koester et. al % Dusty disc Farihi et al. 29; Rocchetto et al % Gaseous component.7 % Debris discs with a gaseous component 2-1 %

46 Summary SDSS J is well studied, but still many unanswered questions. An observable gaseous component appears to be linked with variability Determined the frequency of a gaseous component to a debris disc at a white dwarf.

47 Summary SDSS J is well studied, but still many unanswered questions. An observable gaseous component appears to be linked with variability Determined the frequency of a gaseous component to a debris disc at a white dwarf. Thanks for listening! C.Manser@Warwick.ac.uk