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29 March 2024
 
  » arxiv » 1206.6056

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The Very Short Period M Dwarf Binary SDSS J001641-000925
James R. A. Davenport ; Andrew C. Becker ; Andrew A. West ; John J. Bochanski ; Suzanne L. Hawley ; Jon Holtzman ; Heather C. Gunning ; Eric J. Hilton ; Ferah D. Munshi ; Meagan Albright ;
Date 26 Jun 2012
AbstractWe present follow-up observations and analysis of the recently discovered short period low-mass eclipsing binary, SDSS J001641-000925. With an orbital period of 0.19856 days, this system belongs to a very rare class of contact eclipsing binaries, and has one of the shortest known periods for an M dwarf binary system. Medium-resolution spectroscopy and multi-band photometry for the system are presented. Markov chain Monte Carlo modeling of the light curves and radial velocities yield estimated masses for the stars of M_1 =0.54+/-0.07M_sun and M_2 =0.34+/-0.04M_sun, and radii of R_1 =0.68+/-0.03 R_sun and R_2 = 0.58 +/- 0.03 R_sun respectively. An overcontact scenario is strongly preferred by the binary model. Both stellar components are found to exhibit magnetic activity through H_alpha emission. Using both sparsely sampled survey photometry and dedicated monitoring, the orbital period is found to decrease by dP/dt ~ 8 s yr^{-1}. This is one of the largest amplitude period decays observed for a W UMa type binary, indicating that the system is in contact and losing angular momentum. SDSS J001641-000925 is thus the first verified contact M dwarf binary system.
Source arXiv, 1206.6056
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