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Article overview
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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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