MOA-2010-BLG-328L - Sub-Neptune around M dwarf

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MOA-2010-BLG-328L - Sub-Neptune around M dwarf

Post by Sirius_Alpha on 30th September 2013, 8:25 pm

MOA-2010-BLG-328Lb: a sub-Neptune orbiting very late M dwarf ?
http://arxiv.org/abs/1309.7714

We analyze the planetary microlensing event MOA-2010-BLG-328. The best fit yields host and planetary masses of Mh = 0.11+/-0.01 M_{sun} and Mp = 9.2+/-2.2M_Earth, corresponding to a very late M dwarf and sub-Neptune-mass planet, respectively. The system lies at DL = 0.81 +/- 0.10 kpc with projected separation r = 0.92 +/- 0.16 AU. Because of the host's a-priori-unlikely close distance, as well as the unusual nature of the system, we consider the possibility that the microlens parallax signal, which determines the host mass and distance, is actually due to xallarap (source orbital motion) that is being misinterpreted as parallax. We show a result that favors the parallax solution, even given its close host distance. We show that future high-resolution astrometric measurements could decisively resolve the remaining ambiguity of these solutions.

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Re: MOA-2010-BLG-328L - Sub-Neptune around M dwarf

Post by Edasich on 1st October 2013, 3:43 am

All these low-mass planet around very late type stars should motivate for further RV search of these worlds around dim stars.
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Re: MOA-2010-BLG-328L - Sub-Neptune around M dwarf

Post by Sirius_Alpha on 1st October 2013, 5:29 am

A major problem is that these late M dwarfs are rather dim in wavelengths that are most accessible to Doppler spectroscopy.

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Re: MOA-2010-BLG-328L - Sub-Neptune around M dwarf

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