Importance of tides for periastron precession in eccentric neutron star white dwarf binaries
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Importance of Tides for Periastron Precession in Eccentric Neutron Star - White Dwarf Binaries. Niharika Sravan Midwest Relativity Meeting October 27, 2013. Once Upon A Time…. And then came the GW observer. Periastron Precession.

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Niharika Sravan Midwest Relativity Meeting October 27, 2013

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Importance of tides for periastron precession in eccentric neutron star white dwarf binaries

Importance of Tidesfor Periastron Precession in Eccentric Neutron Star - White Dwarf Binaries

Niharika Sravan

Midwest Relativity Meeting

October 27, 2013


Once upon a time

Once Upon A Time…


And then came the gw observer

And then came the GW observer


Periastron precession

Periastron Precession

  • Is driven by a combination of tidal, rotational and general relativistic effects

Companion Star/Satellite

The quadrupolarperiastron precession constant k2is a measure of the WD's central concentration


Eccentric neutron star white dwarf binaries

Eccentric Neutron Star - White Dwarf binaries

  • Seen in the field as pulsars orbiting WDs

  • Serve as probes into compact object physics that are:

    • Clean

    • Testable

    • Abundant


Importance of tides and rotation in j1141 6545

Is GR enough to place correct constraints on the WD mass?

Importance of Tides and rotation in J1141-6545


Tides dominate in 380 myr

Tides dominate in 380 Myr

GR

Rotation

Tides

Total


Galactic ns wd binaries

Galactic NS-WD binaries


Niharika sravan midwest relativity meeting october 27 2013

0.5 Gyr

13.8 Gyr


Our method

How bad can NOT accounting for tides be?

Our Method


Niharika sravan midwest relativity meeting october 27 2013

0.5 Gyr

13.8 Gyr


Niharika sravan midwest relativity meeting october 27 2013

“Alright, alright!! I get it, tides are important. But how do you expect me to accurately interpret periastron precession rate if I know nothing about the internal structure of the WD?”


Once again

Once again


Facilitating mass extraction k 2 r wd 5 vs m wd

Facilitating mass extraction: k2RWD5 vs. MWD

Use it well.


Conclusions

Conclusions

  • Information about periastron precession rates can be used to place constraints on the properties of compact object binaries

  • Tides can be a significant driver of periastron precession

  • There is a simple relation that connects the WD structure parameters, governing periastron precession, to the WD mass


Questions

Questions?


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