Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542908c&link_type=abstract
American Astronomical Society, AAS Meeting #215, #429.08; Bulletin of the American Astronomical Society, Vol. 42, p.351
Astronomy and Astrophysics
Astronomy
Scientific paper
We announce the discovery of a new low-mass, pre-main sequence (PMS) eclipsing binary star in the Lupus Cloud, MML 53. This is only the 6th sub-solar mass PMS eclipsing binary known. Previous observations of MML 53 found it to be a spectroscopic multiple associated with the 15-22 Myr Upper Centaurus Lupus (UCL) cluster. Here, we identify the object as an eclipsing binary for the first time through the analysis of photometric time series photometry from the SuperWASP transiting planet survey. We derive an accurate ephemeris for the system and present a double-lined orbit solution based on high resolution spectra. The spectra confirm MML 53 to be a triple system of young stars composed of an eclipsing binary and a stationary third component all of which show strong lithium absorption as expected for low-mass, PMS stars. The 2.1 d orbit of the eclipsing pair is circular, and we find the minimum masses of M1 sin3 i = 0.94 M&sun; and M2 sin3 i = 0.81 M&sun; with formal uncertainties of 2.0 %.We find a systemic radial velocity, vγ = +1.00 ± 0.33 ± 0.81 km s-1, consistent with kinematic membership in the UCL association, and the radii of the component stars are 30 % larger than expected for main sequence stars. Follow-up modeling of high cadence, multi-band light-curve data will provide precise fundamental properties of the components of the system which will ultimately be used to place constraints on theoretical models of PMS stellar evolution. This research is supported by an NSF REU grant to the Vanderbilt Physics & Astronomy Department, and by an NSF PAARE grant to Fisk University.
Cargile Phillip A.
Cegla Heather
Hebb Leslie
Palladino Lauren E.
Stassun Keivan G.
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