SIMBAD references

2011ApJ...742..123I - Astrophys. J., 742, 123 (2011/December-1)

LSPM J1112+7626: detection of a 41 day m-dwarf eclipsing binary from the MEarth transit survey.

IRWIN J.M., QUINN S.N., BERTA Z.K., LATHAM D.W., TORRES G., BURKE C.J., CHARBONNEAU D., DITTMANN J., ESQUERDO G.A., STEFANIK R.P., OKSANEN A., BUCHHAVE L.A., NUTZMAN P., BERLIND P., CALKINS M.L. and FALCO E.E.

Abstract (from CDS):

We report the detection of eclipses in LSPM J1112+7626, which we find to be a moderately bright (IC= 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 and M2= 0.275±0.001 Min 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+0.9–0.5% 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.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - stars: low-mass

VizieR on-line data: <Available at CDS (J/ApJ/742/123): table1.dat table4.dat>

Simbad objects: 16

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2021.01.25-15:24:04

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