The First Neptune Analog or Super-Earth with Neptune-like Orbit: MOA-2013-BLG-605Lb

T. Sumi; A. Udalski; D. P. Bennett; A. Gould; R. Poleski; I. A. Bond; N. Rattenbury; R. W. Pogge; T. Bensby; J. P. Beaulieu; J. B. Marquette; V. Batista; S. Brillant; F. Abe; Y. Asakura; A. Bhattacharya; M. Donachie; M. Freeman; A. Fukui; Y. Hirao; Y. Itow; N. Koshimoto; M. C. A. Li; C. H. Ling; K. Masuda; Y. Matsubara; Y. Muraki; M. Nagakane; K. Ohnishi; H. Oyokawa; To. Saito; A. Sharan; D. J. Sullivan; D. Suzuki; P.; J. Tristram; A. Yonehara; M. K. Szymanski; K. Ulaczyk; S. Kozlowski; L. Wyrzykowski; M. Kubiak; P. Pietrukowicz; G. Pietrzynski; I. Soszynski; C. Han; Y. -K. Jung; I. -G Shin; C-U. Lee

doi:10.3847/0004-637X/825/2/112

paper

The First Neptune Analog or Super-Earth with Neptune-like Orbit: MOA-2013-BLG-605Lb

arXiv:1512.00134 · doi:10.3847/0004-637X/825/2/112

Abstract

We present the discovery of the first Neptune analog exoplanet or super-Earth with Neptune-like orbit, MOA-2013-BLG-605Lb. This planet has a mass similar to that of Neptune or a super-Earth and it orbits at $9 \sim 14$ times the expected position of the snow-line, $a_{snow}$ , which is similar to Neptune's separation of $11 a_{snow}$ from the Sun. The planet/host-star mass ratio is $q = (3.6 \pm 0.7) \times 1 0^{- 4}$ and the projected separation normalized by the Einstein radius is $s = 2.39 \pm 0.05$ . There are three degenerate physical solutions and two of these are due to a new type of degeneracy in the microlensing parallax parameters, which we designate "the wide degeneracy". The three models have (i) a Neptune-mass planet with a mass of $M_{p} = 2 1_{- 7}^{+ 6} M_{E a r t h}$ orbiting a low-mass M-dwarf with a mass of $M_{h} = 0.1 9_{- 0.06}^{+ 0.05} M_{⊙}$ , (ii) a mini-Neptune with $M_{p} = 7. 9_{- 1.2}^{+ 1.8} M_{E a r t h}$ orbiting a brown dwarf host with $M_{h} = 0.06 8_{- 0.011}^{+ 0.019} M_{⊙}$ and (iii) a super-Earth with $M_{p} = 3. 2_{- 0.3}^{+ 0.5} M_{E a r t h}$ orbiting a low-mass brown dwarf host with $M_{h} = 0.02 5_{- 0.004}^{+ 0.005} M_{⊙}$ which is slightly favored. The 3-D planet-host separations are 4.6 $_{- 1.2}^{+ 4.7}$ AU, 2.1 $_{- 0.2}^{+ 1.0}$ AU and 0.94 $_{- 0.02}^{+ 0.67}$ AU, which are $8. 9_{- 1.4}^{+ 10.5}$ , $1 2_{- 1}^{+ 7}$ or $1 4_{- 1}^{+ 11}$ times larger than $a_{snow}$ for these models, respectively. The Keck AO observation confirm that the lens is faint. This discovery suggests that low-mass planets with Neptune-like orbit are common. So processes similar to the one that formed Neptune in our own Solar System or cold super-Earth may be common in other solar systems.

54 pages, 10 figures, 13 tables, Accepted for publication in the ApJ

The First Neptune Analog or Super-Earth with Neptune-like Orbit: MOA-2013-BLG-605Lb

Abstract

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