Tuesday, April 16, 2013

1304.3459 (Maddalena Reggiani et al.)

On the Universality of the Companion Mass Ratio Distribution    [PDF]

Maddalena Reggiani, Michael R. Meyer
We present new results regarding the companion mass ratio distribution (CMRD) of stars, as a follow up of the work reported in Reggiani & Meyer (2011). We use a maximum likelihood estimation method to re-derive the field CMRD power law avoiding dependence on the arbitrary binning. We also consider two new surveys of multiples in the field for solar-type stars (Raghavan et al. 2010) and M dwarfs (Janson et al. 2012) to test the universality of the CMRD. We do not find significant differences in the CMRD for M dwarfs and solar-type stars compared to previous results over the common mass ratio and separation range. The new best fit power law of the CMRD in the field, combining Raghavan et al. (2010) and Janson et al. (2012) data, is dN/dq ~ q^beta, with beta = 0.25 +/- 0.29.
View original: http://arxiv.org/abs/1304.3459

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