Lspm J1112+7626: Detection of a 41 Day M-dwarf Eclipsing Binary From the Mearth Transit Survey
Author
Irwin, Jonathan M.
Quinn, Samuel N.
Berta, Zachory K.
Latham, David W.
Torres, Guillermo
Burke, Christopher J.
Charbonneau, David
Dittmann, Jason
Esquerdo, Gilbert A.
Stefanik, Robert P.
Oksanen, Arto
Buchhave, Lars A.
Nutzman, Philip
Berlind, Perry
Calkins, Michael L.
Falco, Emilio E.
Published Version
https://doi.org/10.1088/0004-637X/742/2/123Metadata
Show full item recordCitation
Irwin, Jonathan M., Samuel N. Quinn, Zachory K. Berta, David W. Latham, Guillermo Torres, Christopher J. Burke, David Charbonneau, et al. 2011. “LSPM J1112+7626: DETECTION OF A 41 DAY M-DWARF ECLIPSING BINARY FROM THE MEARTH TRANSIT SURVEY.” The Astrophysical Journal 742 (2): 123. https://doi.org/10.1088/0004-637x/742/2/123.Abstract
We report the detection of eclipses in LSPM J1112+7626, which we find to be a moderately bright (I-C = 12.14 +/- 0.05) very low mass binary system with an orbital period of 41.03236 +/- 0.00002 days, and component masses M-1 = 0.395 +/- 0.002 M-circle dot and M-2 = 0.275 +/- 0.001 M-circle dot in an eccentric (e = 0.239 +/- 0.002) orbit. A 65 day out-of-eclipse modulation of approximately 2% peak-to-peak amplitude is seen in I-band, which is probably due to rotational modulation of photospheric spots on one of the binary components. This paper presents the discovery and characterization of the object, including radial velocities sufficient to determine both component masses to better than 1% precision, and a photometric solution. We find that the sum of the component radii, which is much better determined than the individual radii, is inflated by 3.8(-0.5)(+0.9)% compared to the theoretical model predictions, depending on the age and metallicity assumed. These results demonstrate that the difficulties in reproducing observed M-dwarf eclipsing binary radii with theoretical models are not confined to systems with very short orbital periods. This object promises to be a fruitful testing ground for the hypothesized link between inflated radii in M-dwarfs and activity.Terms of Use
This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAACitable link to this page
http://nrs.harvard.edu/urn-3:HUL.InstRepos:41397455
Collections
- FAS Scholarly Articles [18296]
Contact administrator regarding this item (to report mistakes or request changes)