Astronomy:HD 20781 e
| Discovery[3] | |
|---|---|
| Discovered by | Mayor et al. |
| Discovery date | 2011, published in 2019[1] |
| Radial velocity[2] | |
| Orbital characteristics[4] | |
| 0.3374+0.0155 −0.0170 astronomical unit|AU | |
| Eccentricity | 0.06+0.06 −0.04 |
| Orbital period | 85.5073+0.0983 −0.0947 d |
| astron|astron|helion}} | 2,455,513.3912+14.3623 −16.0090 JD |
| 70.59°+61.40° −67.58° | |
| Semi-amplitude | 2.60±0.14 m/s |
| Star | HD 20781 |
| Physical characteristics | |
| Mean radius | ~2.17 R⊕ (estimate)[1] |
| Mass | ≥14.03±1.56 M⊕[4] |
HD 20781 e is a hot Neptune around the star HD 20781. The planet has a minimum mass of 14.03 Earth masses[4] and it orbits with a semi-major axis of 0.3374 astronomical units and an orbital eccentricity of approximately 0.06.[1][4] With the same composition as Neptune, it would have a radius of 3.79 times that of the Earth. With the same composition as Earth, it would have a radius of 2.08 times that of the Earth. It orbits near the inner edge of the habitable zone of HD 20781.[citation needed]
This planet was initially reported in a 2011 preprint, which referred to it as HD 20781 c.[3] However, the 2017 paper (published in a journal in 2019) that confirmed the planet designated it HD 20781 e, using the c designation for a different, shorter-period planet.[4]
References
- ↑ 1.0 1.1 1.2 "Exoplanet Catalog HD 20781". https://exoplanets.nasa.gov/exoplanet-catalog/7308/hd-20781-e/.
- ↑ "Planet HD 20781 e". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/hd_20781_e--7641/.
- ↑ 3.0 3.1 Mayor, M.; Marmier, M.; Lovis, C.; Udry, S.; Ségransan, D.; Pepe, F.; Benz, W.; Bertaux, J.-L.; Bouchy, F.; Dumusque, X.; Curto, G. Lo; Mordasini, C.; Queloz, D.; Santos, N. C. (2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv:1109.2497 [astro-ph.EP].
- ↑ 4.0 4.1 4.2 4.3 4.4 Udry, S.; Dumusque, X.; Lovis, C.; Ségransan, D.; Diaz, R. F.; Benz, W.; Bouchy, F.; Coffinet, A. et al. (February 2019). "The HARPS search for southern extra-solar planets: XLIV. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions". Astronomy & Astrophysics 622: A37. doi:10.1051/0004-6361/201731173. ISSN 0004-6361. Bibcode: 2019A&A...622A..37U.
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