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Do Protostellar Luminosities Imply Episodic Accretion?

Do Protostellar Luminosities Imply Episodic Accretion?. Oort 2014 Workshop Tuesday, May 13, 2014. Mike Dunham, SMA Fellow, CfA. Protostellar Accretion. m , m_dot not directly observable Luminosity is indirect tracer of m_dot Constrain accretion theories?

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Do Protostellar Luminosities Imply Episodic Accretion?

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  1. Do Protostellar Luminosities Imply Episodic Accretion? Oort 2014 Workshop Tuesday, May 13, 2014 Mike Dunham, SMA Fellow, CfA

  2. Protostellar Accretion • m, m_dotnot directly observable • Luminosity is indirect tracer of m_dot • Constrain accretion theories? • Small, biased samples; incompletely sampled SEDs

  3. Protostellar Luminosities Dunham et al. (2014), credit to W. Fischer

  4. Protostellar Luminosities Dunham et al. (2014), credit to W. Fischer

  5. Protostellar Luminosities Kenyon et al. (1990, 1994); Kenyon & Hartmann (1995); Dunham et al. (2013)

  6. Protostellar Luminosities Kenyon et al. (1990, 1994); Kenyon & Hartmann (1995)Dunham et al. (2010a), Young & Evans (2005)

  7. Protostellar Luminosities Variable/Episodic Accretion? Dunham et al. (2014), credit to W. Fischer

  8. Protostellar Accretion Variable/Episodic Accretion: Does It Work?

  9. Protostellar Accretion Variable/Episodic Accretion: Does It Work? Dunham et al. (2010a)

  10. Protostellar Accretion Variable/Episodic Accretion: Does It Work? Vorobyov & Basu (2005, 2006, 2010) Dunham & Vorobyov (2012)

  11. Protostellar Accretion Mass-dependent accretion can also workRelative importance of stochastic vs. secular processes? Dunham et al. (2014), credit to S. Offner(Dunham & Vorobyov 2012; McKee & Offner (2010); Offner & McKee 2011; Myers 2009-2014)

  12. Comments from the skeptic

  13. Episodic Accretion Does the Variability Matter? Vorobyov & Basu (2005, 2006, 2010) Dunham & Vorobyov (2012)

  14. Episodic Accretion Is the IMF Weighting Correct?Are relatively high-mass stars missing? Vorobyov & Basu (2005, 2006, 2010) Dunham & Vorobyov (2012)

  15. Episodic Accretion Are the Disks Realistic? Vorobyov & Basu (2005, 2006, 2010) Dunham, Vorobyov, & Arce (2014), submitted

  16. Comparing Apples and Oranges? Mass-Dependent Accretion

  17. Are we comparing to the correct observed distribution? Prospects for Resolution Core Association(Dunham et al. 2013) IR Colors(Kryukova et al. 2012) • Deeper dense core surveys • Surveys for dense gas • Proper motion studies Kryukova et al. (2012); Dunham et al. (2013)

  18. Future Directions Refine the sample of protostars and luminosity measurements (Relatively simple to do in the near future) Make sure modelers and observers are comparing the same quantities (Best way to do this?) Compare to more than just luminosity distribution (BLT distribution, Class 0 vs. I lifetimes and luminosity distributions, disk masses, protostellar masses [eventually], …) Constrain the frequency, timescales and amplitudes of variability

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